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1.
J Appl Oral Sci ; 27: e20180700, 2019 Jun 03.
Artigo em Inglês | MEDLINE | ID: mdl-31166415

RESUMO

INTRODUCTION: Alternatives for the treatment of caries disease, such as minimally invasive approaches, have been developed in recent years. OBJECTIVE: To carry out clinical and radiographic evaluations of three cavity liners after selective caries removal. METHODOLOGY: Thirty-six primary molars with deep occlusal caries lesions without pulp involvement (from children of both genders, aged between 5 and 8 years) were randomly divided into the following groups: calcium hydroxide cement (CHC) group; mineral trioxide aggregate (MTA) group and Portland cement with added zirconium oxide (PCZ) group. The following-up period was 6- and 12-month. The clinical and radiographic success rates were evaluated through chi-square test. The radiographic measurements were compared by ANOVA followed by Tukey's test (p<0.05). RESULTS: Thirty-six patients were included, but thirty-four returned for 12-month follow-up. The overall success rate of the therapy for the three groups was 94.11% and no statistically significant differences occurred in the comparison among groups (p>0.05). Nineteen radiographs were selected to measure the dentin barrier thickness. The intragroup comparison presented a statistically significant increase of the dentin barrier for all groups, at 12-month follow-up. However, the MTA group showed increase of the dentin barrier, over time, 6- to 12-month follow-up. The intergroup comparison revealed no statistically significant differences (p>0.05). CONCLUSION: The clinical and radiographic data showed that all cavity liners provided effective treatment of primary teeth after selective caries removal.


Assuntos
Compostos de Alumínio/uso terapêutico , Compostos de Cálcio/uso terapêutico , Hidróxido de Cálcio/uso terapêutico , Cárie Dentária/terapia , Forramento da Cavidade Dentária/métodos , Óxidos/uso terapêutico , Silicatos/uso terapêutico , Zircônio/uso terapêutico , Análise de Variância , Criança , Pré-Escolar , Cárie Dentária/diagnóstico por imagem , Cimentos Dentários/uso terapêutico , Cavidade Pulpar/anatomia & histologia , Cavidade Pulpar/efeitos dos fármacos , Restauração Dentária Permanente/métodos , Combinação de Medicamentos , Feminino , Seguimentos , Humanos , Masculino , Radiografia Dentária , Fatores de Tempo , Dente Decíduo , Resultado do Tratamento
2.
Braz Oral Res ; 33: e038, 2019 May 27.
Artigo em Inglês | MEDLINE | ID: mdl-31141036

RESUMO

This study aimed to evaluate the bond strength of a universal adhesive system to enamel surrounding real-life carious cavities. Twenty-eight permanent molars (n = 7) with carious lesions in dentin were subjected to selective carious tissue removal to firm dentin and had their crowns sectioned longitudinally. A universal adhesive system (Single Bond Universal [SBU] used in either etch-and-rinse and self-etch strategies) was compared with an etch-and-rinse Adper Single Bond 2 (ASB) and a self-etch Clearfil SE Bond (CSE) adhesive systems (control systems). Adhesives were applied on the enamel, assumed demineralized, surrounding the cavity margins and on sound enamel (control substrate). Composite cylinders were built (0.72 mm2) and microshear bond strength (µSBS) test was performed after 24 h of water storage. The µSBS values (MPa) were analyzed using two-way ANOVA and Tukey's post hoc tests (α = 0.05). Bond strength values obtained in demineralized enamel surrounding carious cavity margins were significantly lower than that obtained in sound enamel (distant from carious cavity margins) (p = 0.035). The bonding strategy of the SBU did not influenced the bond strength values, which were higher than that obtained with ASB. CSE showed similar µSBS values to ASB and SBU in the self-etch mode. In conclusion, the bond strength to enamel assumed demineralized is lower than to sound enamel. The enamel surrounding carious cavities jeopardize the bonding of universal adhesive system. The bond strength of universal adhesive is similar, regardless to bonding strategy.


Assuntos
Bis-Fenol A-Glicidil Metacrilato/química , Colagem Dentária/métodos , Cárie Dentária/terapia , Cimentos Dentários/química , Esmalte Dentário/efeitos dos fármacos , Análise de Variância , Bis-Fenol A-Glicidil Metacrilato/uso terapêutico , Cimentos Dentários/uso terapêutico , Dentina/efeitos dos fármacos , Humanos , Teste de Materiais , Microscopia Eletrônica de Varredura , Distribuição Aleatória , Reprodutibilidade dos Testes , Cimentos de Resina/química , Cimentos de Resina/uso terapêutico , Resistência ao Cisalhamento , Estatísticas não Paramétricas , Propriedades de Superfície
3.
Am J Orthod Dentofacial Orthop ; 155(4): 523-528, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30935607

RESUMO

OBJECTIVE: To compare the clinical bracket failure rate and bonding time differences between Adhesive Precoated Flash-Free (APCF) and Adhesive Precoated Plus (APCP) bracket systems. METHODS: Thirty-three patients (7 male and 26 female) with a mean age of 17.2 ± 3.6 years and permanent dentition were included in the study. Total of 660 brackets were bonded by 1 operator with the use of a split-mouth design, and bracket failure rates were observed over 6 months. Bracket bonding time of each group was also evaluated. Bracket failure rates were evaluated by means of chi-square test. One-way analysis of variance (ANOVA) and Tukey honestly significant difference tests were used to evaluate the bonding time differences between groups. RESULTS: The overall, APCF, and APCP bracket failure rates were 1.21%, 1.81%, and 1.51%, respectively. Chi-square test revealed significant differences (P <0.01) between groups in bracket failure rates. The upper left APCP group showed significantly (P <0.05) more failure than the other groups. One-way ANOVA test (P <0.001) showed statistically significant bonding time differences between groups. Bonding time of APCF brackets was significantly shorter than the bonding time of APCP brackets for the same quadrants. Chi-square test did not reveal significant differences (P >0.05) between groups according to adhesive remnant index scores. CONCLUSIONS: Compared with APCP brackets, APCF brackets can reduce the bonding time without increasing bracket failure rate.


Assuntos
Colagem Dentária , Cimentos Dentários/uso terapêutico , Braquetes Ortodônticos , Colagem Dentária/efeitos adversos , Colagem Dentária/métodos , Cimentos Dentários/efeitos adversos , Feminino , Humanos , Masculino , Má Oclusão de Angle Classe I/terapia , Má Oclusão de Angle Classe II/terapia , Braquetes Ortodônticos/efeitos adversos , Falha de Tratamento , Adulto Jovem
4.
Bull Tokyo Dent Coll ; 60(1): 17-27, 2019 Feb 28.
Artigo em Inglês | MEDLINE | ID: mdl-30700646

RESUMO

The purpose of this study was to investigate the influence of differences in axial thickness and type of cement on fracture load in CAD/CAM crowns. Assuming the mandibular first premolar to be the abutment tooth, 4 types of crown with different axial thicknesses and radii of curvature were prepared. To unify external design, the morphology of the crown margins was set at 0.15, 0.30, 0.45, or 0.60 mm, thus maintaining uniform axial form of the crowns. The CAD/CAM crowns and abutment teeth were bonded using each of 2 types of resin cement or polycarboxylate cement. The fracture load value was measured using a universal testing machine and the destruction phase observed.No significant difference was observed with change in axial thickness. The fracture load values with each of the 2 types of resin cement used were significantly higher than that with polycarboxylate cement (p<0.01). These results suggest that the fracture load values of CAD/CAM crowns are not influenced by differences in the axial thickness of the crown, and that they are higher when bonding is achieved with resin rather than polycarboxylate cement.


Assuntos
Resinas Compostas/uso terapêutico , Projeto Auxiliado por Computador , Coroas , Cimentos Dentários/uso terapêutico , Planejamento de Prótese Dentária/métodos , Falha de Restauração Dentária , Análise do Estresse Dentário , Humanos , Suporte de Carga
5.
J Prosthodont ; 28(1): e342-e349, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29654646

RESUMO

PURPOSE: To investigate the effect of various surface pretreatments and adhesive systems on bond strength of resin cement to polyetheretherketone (PEEK). MATERIALS AND METHODS: 360 PEEK specimens were divided into 4 groups to receive the following pretreatments (n = 90): no pretreatment, sandblasting, silica coating and Er:YAG laser. Surface roughness (SR) and scanning electron microscopy (SEM) evaluations were conducted after mechanical pretreatments for topographical surface evaluations. After the pretreatments, each group was divided into 3 subgroups (n = 30) according to the adhesive system used: no adhesive system, Visio.link, and Signum PEEK Bond. Resin cement was applied, and specimens underwent 5000 thermocycles (5-55°C) before shear bond strength (SBS) test. One-way ANOVA and Tukey test were used to analyze the SR data; 2-way ANOVA and Fisher's LSD test were used to analyze the SBS data at the confidence interval of 95% (α = 0.05). RESULTS: The sandblasting group demonstrated the highest SR values (p < 0.05). No significant differences in SR values were identified among silica coating, laser, and control groups (p ˃ 0.05). Conditioning with Visio.link after sandblasting group exhibited the highest SBS values (p < 0.05). No significant differences in SBS values were found between laser and control group (p ˃ 0.05). Conditioned groups presented higher SBS values than unconditioned groups (p < 0.05). Between the two adhesive systems, Visio.link demonstrated statistically significant higher SBS values than Signum PEEK Bond (p < 0.05). CONCLUSION: Silica coating and sandblasting were shown to provide superior pretreatment of PEEK surface. Laser pretreatments showed no effectiveness on bond strength of resin cement to PEEK. Adhesive systems improved the resin bonding to PEEK.


Assuntos
Colagem Dentária , Cimentos Dentários/uso terapêutico , Materiais Dentários/uso terapêutico , Cetonas/uso terapêutico , Polietilenoglicóis/uso terapêutico , Cimentos de Resina/uso terapêutico , Colagem Dentária/métodos , Polimento Dentário , Análise do Estresse Dentário , Técnicas In Vitro , Lasers de Estado Sólido , Microscopia Eletrônica de Varredura , Resistência ao Cisalhamento , Propriedades de Superfície
6.
J Prosthodont ; 28(1): e332-e336, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29578300

RESUMO

PURPOSE: The apical seal provided by a root canal filling may be breached via coronal leakage. This study aimed to compare the teeth restored with custom-made cast metal posts and cores cemented with different luting agents in terms of coronal microleakage after thermocycling. MATERIALS AND METHODS: This in vitro study was conducted on 32 extracted single-canal teeth. Root canals were prepared by step-back technique and filled with gutta percha and sealer. The coronal 7 mm of gutta percha was removed, and post space was prepared using peeso reamers #2 and #3 consecutively. After fabricating the acrylic resin patterns of the posts and cores, they were cast using Ni-Cr metal alloy. The specimens were divided into 4 groups in which the castings were cemented using one of the following luting agents: zinc phosphate (ZP), glass ionomer (GI), Panavia F 2.0, and Speed CEM. After cementation, the teeth were immersed in distilled water and incubated for 7 days. Then, the teeth were subjected to thermocycling, immersed in silver nitrate for 6 hours, and finally sectioned. The degree of dye penetration into the coronal part of the specimens was measured using a stereomicroscope. Data were analyzed using Kruskal-Wallis and Mann-Whitey U tests with significance level of 0.05. RESULTS: The median microleakage in ZP, Speed CEM, GI, and Panavia were 171.89, 114.76, 26.51, and 20.02 µm, respectively. Pairwise comparisons among GI and ZP, GI, and Speed CEM, ZP and Panavia, ZP and Speed CEM, and Panavia and Speed CEM groups yielded significant differences (p < 0.05). CONCLUSION: Complete coronal seal was not achieved with any of the luting agents. The highest and the lowest degree of microleakage was yielded by ZP and Panavia luting agents, respectively.


Assuntos
Cimentos Dentários/uso terapêutico , Infiltração Dentária/etiologia , Restauração Dentária Permanente/métodos , Técnica para Retentor Intrarradicular/efeitos adversos , Restauração Dentária Permanente/efeitos adversos , Humanos , Técnicas In Vitro , Obturação do Canal Radicular/efeitos adversos , Obturação do Canal Radicular/métodos
7.
J Prosthodont ; 28(2): e705-e712, 2019 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-29522263

RESUMO

PURPOSE: To evaluate the biocompatibility of five dental cement compositions after directly exposing human gingival fibroblast (HGF) and MC3T3-E1 preosteoblast cells to cement alone and cement applied on commercially pure titanium (cpTi) specimens. MATERIALS AND METHODS: Nanostructurally integrated bioceramic (NIB), resin (R), resin-modified glass ionomer (RMGIC), zinc oxide eugenol (ZOE), and zinc phosphate (ZP) compositions were prepared according to the respective manufacturer's instructions. Samples were prepared in cylindrical Teflon molds or applied over the entire surface of polished cpTi discs. All samples were cured for 0.5, 1, 12, or 24 hours post-mixing. Direct contact testing was conducted according to ISO 10993 by seeding 6-well plates at 350,000 cells/well. Plates were incubated at 37°C in a humidified atmosphere with 5% CO2 for 24 hours before individually plating samples and cpTi control discs. Plates were then incubated for an additional 24 hours. Microtetrazolium (MTT) cell viability assays were used to measure sample cytotoxicity. RESULTS: For samples that cured for 24 hours prior to direct contact exposure, only NIB and ZP cements when cemented on cpTi demonstrated cell viability percentages above the minimum biocompatibility requirement (≥70%) for both the investigative cell lines. R, RMGIC, and ZOE cements exhibited moderate to severe cytotoxic effects on both cell lines in direct contact and when cemented on cpTi specimens. For HGF cells, ZOE cemented-cpTi specimens exhibited significantly decreased cytotoxicity, whereas RMGIC cemented-cpTi specimens exhibited significantly increased cytotoxicity. CONCLUSIONS: Despite previous studies that showed enhanced cpTi corrosion activity for fluoride-containing compositions (NIB and ZP), there was no significant difference in cytotoxicity between cement alone and cemented-cpTi. In general, the MC3T3-E1 preosteoblast cells were more sensitive than HGF cells to cement composition. Ultimately, cement composition played a significant role in maintaining host cell compatibility. Results of this work help illustrate the impact of different cement formulations on host cell health and emphasize the need for understanding material properties when selecting certain formulations of dental cements, which can ultimately influence the survival of dental implant systems.


Assuntos
Materiais Biocompatíveis , Cimentos Dentários/uso terapêutico , Implantes Dentários , Titânio , Sobrevivência Celular/efeitos dos fármacos , Cerâmica/uso terapêutico , Retenção em Prótese Dentária/métodos , Fibroblastos , Gengiva/citologia , Cimentos de Ionômeros de Vidro/uso terapêutico , Humanos , Técnicas In Vitro , Teste de Materiais/métodos , Nanoestruturas/uso terapêutico , Cimento de Óxido de Zinco e Eugenol/uso terapêutico , Cimento de Fosfato de Zinco/uso terapêutico
8.
J Prosthodont ; 28(1): e74-e81, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29314449

RESUMO

PURPOSE: To assess the correspondence of shades between try-in pastes and resin cements and their influence on the final color of veneers. MATERIALS AND METHODS: Bovine teeth (n = 140) were prepared and divided into 2 groups (a or b) according to ceramic veneer thickness (0.35 or 0.70 mm). Seventy teeth (n = 70) were distributed in 7 groups (groups 1 to 7a and groups 1 to 7b; n = 10). Try-in pastes and their corresponding resin cements were used according to the value: groups 1a and 1b (value -3); groups 2a and 2b (-2); groups 3a and 3b (-1); groups 4a and 4b (0); groups 5a and 5b (+1); groups 6a and 6b (+2); groups 7a and 7b (+3). Color measurements were performed with spectrophotometer, and the coordinates L* , a* , and b* were obtained. The final color change (ΔE) was calculated from these coordinates: ΔE0 (trial - substrate), ΔE1 (cementation - substrate), and ΔE2 (cementation - trial). The data were analyzed using the Kolmogorov-Smirnov test, the Wilcoxon test, or t-test for paired samples and repeated-measures ANOVA, post hoc Bonferroni, or the Friedman test (p < 0.05). RESULTS: The results indicated no statistically significant difference between the groups comparing ΔE0 and ΔE1 for 0.35 mm thickness laminate veneers, except for groups 2a and 5a. For 0.70 mm thickness laminate veneers, no statistically significant differences were observed between the groups comparing ΔE0 and ΔE1. ΔE2 values for 0.35 mm and 0.70 mm thickness laminate veneers ranged from 1.77 ± 0.81 to 4.99 ± 3.80 and from 1.01 ± 0.73 to 4.66 ± 2.96, respectively. CONCLUSIONS: Try-in pastes correspond with their respective resin cements for most colors investigated. The color of the resin cement may influence the final color of laminate veneers. Thickness of the ceramic was the most relevant variable for color change.


Assuntos
Cimentos Dentários/uso terapêutico , Facetas Dentárias , Pigmentação em Prótese , Cimentos de Resina/uso terapêutico , Animais , Bovinos , Cor , Cimentos Dentários/efeitos adversos , Cimentos de Resina/efeitos adversos
9.
Am J Orthod Dentofacial Orthop ; 155(1): 88-97, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-30591172

RESUMO

INTRODUCTION: The aim of this study was to determine the effect of an orthodontic bonding adhesive containing benzalkonium chloride (BAC) on enamel demineralization. METHODS: Eighteen female Sprague-Dawley rats, aged 8 to 10 weeks, were inoculated with Streptococcus sobrinus for 5 days. The animals were randomly divided into the control, non-BAC, and BAC groups. The 6 animals in each group did not receive any brackets, received brackets on the maxillary left first molars bonded with conventional adhesive, or received brackets on the maxillary left and right first molars bonded with adhesive incorporated with 0.25% and 0.75% BAC (wt/wt), respectively. After 7 weeks, the maxillae were soaked in murexide stain to observe the surface area (mm2) and percentages of enamel demineralization on the palatal, mesial, buccal, and occlusal surfaces of the maxillary molars using color-based image analysis. RESULTS: The non-BAC and BAC groups exhibited greater enamel demineralization compared with the control group. The surface areas and percentages of enamel demineralization in the BAC group were less compared with the non-BAC group. Less enamel demineralization was noted in the animals treated with 0.75% BAC compared with those given 0.25% BAC in all areas; however, these differences were not great enough to attain statistical significance at the 0.05 level. CONCLUSIONS: The addition of BAC to an orthodontic composite has the potential to reduce the amount and percentage of enamel demineralization. In addition to being an antibacterial agent, BAC may also have an anticariogenic effect. Increased sample sizes and testing of more concentrations of BAC are recommended.


Assuntos
Anti-Infecciosos Locais/uso terapêutico , Compostos de Benzalcônio/uso terapêutico , Cimentos Dentários/uso terapêutico , Desmineralização do Dente/prevenção & controle , Animais , Anti-Infecciosos Locais/farmacologia , Compostos de Benzalcônio/farmacologia , Cárie Dentária/prevenção & controle , Cimentos Dentários/farmacologia , Feminino , Humanos , Ratos , Ratos Sprague-Dawley , Dente/efeitos dos fármacos
10.
Biomed Res Int ; 2018: 1498901, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30426003

RESUMO

The reinforcement of resins with short or long fibers has multiple applications in various engineering and biomedical fields. The use of fiber reinforced composites (FRCs) in dentistry has been described in the literature from more than 40 years. In vitro studies evaluated mechanical properties such as flexural strength, fatigue resistance, fracture strength, layer thickness, bacterial adhesion, bonding characteristics with long fibers, woven fibers, and FRC posts. Also, multiple clinical applications such as replacement of missing teeth by resin-bonded adhesive fixed dental prostheses of various kinds, reinforcement elements of dentures or pontics, and direct construction of posts and cores have been investigated. In orthodontics, FRCs have been used also for active and passive orthodontic applications, such as anchorage units, en-masse movement units, and postorthodontic tooth retention. FRCs have been extensively tested in the literature, but today the advances in new technologies involving the introduction of nanofillers or new fibers along with understanding the design principles of FRC devices open new fields of research for these materials both in vitro and in vivo. The present review describes past and present applications of FRCs and introduces some future perspectives on the use of these materials.


Assuntos
Resinas Compostas , Cimentos Dentários , Prótese Dentária , Nanofibras , Técnicas de Movimentação Dentária/métodos , Resinas Compostas/química , Resinas Compostas/uso terapêutico , Cimentos Dentários/química , Cimentos Dentários/uso terapêutico , Humanos , Nanofibras/química , Nanofibras/uso terapêutico
11.
J Prosthet Dent ; 120(4): 631.e1-631.e6, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-30314611

RESUMO

STATEMENT OF PROBLEM: The color stability and mechanical properties of luting agents influence the esthetics and longevity of ceramic restorations. However, studies evaluating the color changes and mechanical properties of luting agents under ceramic laminates activated by using different methods are lacking. PURPOSE: The purpose of this in vitro study was to evaluate the effects of different modes of photoactivation on the nanohardness and elastic modulus of resin cements and dental adhesives and on the color stability of ceramic laminate veneers. MATERIAL AND METHODS: Forty-four lithium disilicate blocks (7×8×0.6 mm) were cemented onto bovine enamel and divided into 4 groups according to the polymerization light (Radii-Cal or Valo) used and the mode of activation of the dental adhesive (no previous photoactivation or previous photoactivation). Single Bond Universal dental adhesive and RelyX Veneer resin cement were used in all experimental groups. Color stability was measured using a UV-2450 ultraviolet-visible spectrophotometer before and after ultraviolet-B artificial accelerated aging (n=8). The nanohardness and the elastic modulus of the adhesive and resin cement were measured using a nanohardness tester (n=3). The color stability and mechanical properties were measured and analyzed using ANOVA and the Tukey least significant difference test (α=.05). RESULTS: No difference in color stability or mechanical properties of the resin cement among the polymerization lights was detected (P>.05). Specimens that underwent previous photoactivation of the adhesive using the Valo polywave unit exhibited higher elastic modulus values than those that did not undergo previous photoactivation (P<.001). CONCLUSIONS: The Valo polywave polymerization light improved mechanical properties and color stability more than the Radii-Cal unit. Previous activation of the dental adhesive in the dental enamel with the Valo polywave polymerization light yielded more satisfactory results.


Assuntos
Cerâmica/uso terapêutico , Planejamento de Prótese Dentária , Restauração Dentária Permanente , Facetas Dentárias , Pigmentação em Prótese , Animais , Bovinos , Cor , Cimentos Dentários/uso terapêutico , Restauração Dentária Permanente/métodos , Elasticidade , Dureza , Técnicas In Vitro , Cura Luminosa de Adesivos Dentários , Cimentos de Resina/uso terapêutico
12.
Clin Oral Implants Res ; 29(10): 996-1006, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-30238517

RESUMO

OBJECTIVES: To assess the early histological, microbiological, radiological, and clinical response to cemented and screw-retained all-ceramic single-tooth implant-supported reconstructions. MATERIALS AND METHODS: Patients with single-tooth implants were randomly allocated to receive a cemented lithium disilicate crown on a customized zirconia abutment (CEM) or a screw-retained crown with a directly veneered zirconia abutment (SCREW). At the screening visit, at crown insertion and at the 6-month follow-up, clinical parameters were measured at the implant and the contralateral tooth. Marginal bone levels, technical parameters, and esthetic outcomes were measured at the implants. At the 6-month follow-up, a microbiological test was performed and a soft tissue biopsy was harvested at the implants for histological analysis. Inflammatory cells and fibroblasts/-cytes were analyzed at the level of the sulcular epithelium, junctional epithelium, and connective tissue. The histological parameters were analyzed by means of a linear mixed model. RESULTS: Thirty-three patients completed the study, and implant and crown survival rates were 100% at 6 months. Histologically, the number of inflammatory cells tended to be higher in group CEM (p > 0.05). Moreover, significantly less inflammatory cells and fibroblasts/-cytes were found in the sulcular epithelium compared to the junctional epithelium and supracrestal connective tissue (p < 0.001). Four patients were tested positive for periodontal marker pathogens at the 6-month follow-up, and three of them belonged to group CEM. From crown insertion to the 6-month follow-up, median marginal bone levels changed only minimally and measured 0.31 and 0.32 mm in group CEM and 0.47 and 0.36 mm in group SCREW, respectively. Clinical and esthetic parameters remained stable over time and were comparable between natural teeth and implants as well as between the groups. CONCLUSIONS: Cemented reconstructions were associated with more inflammatory cells, and more patients were diagnosed with periodonto-pathogens. Both types of reconstructions resulted in similar radiological (marginal bone levels) and clinical outcomes (bleeding on probing and probing depth).


Assuntos
Parafusos Ósseos , Cerâmica/uso terapêutico , Coroas , Cimentos Dentários/uso terapêutico , Prótese Dentária Fixada por Implante , Periodonto/patologia , Perda do Osso Alveolar/diagnóstico por imagem , Perda do Osso Alveolar/microbiologia , Perda do Osso Alveolar/patologia , Dente Suporte , Projeto do Implante Dentário-Pivô , Implantes Dentários para Um Único Dente , Prótese Dentária Fixada por Implante/métodos , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Periodonto/diagnóstico por imagem , Periodonto/microbiologia , Radiografia Dentária , Zircônio/uso terapêutico
13.
Eur J Oral Sci ; 126 Suppl 1: 95-101, 2018 10.
Artigo em Inglês | MEDLINE | ID: mdl-30178556

RESUMO

In dentistry, isotropic materials, such as metals, ceramics, and polymers, are used. Their properties are not related to any specific direction of the material microstructure. There is a trend toward non-metallic, adhesive, and minimally invasive dentistry. This is in line with the conceptual change seen in the automobile industry, in which the basis of car structures has changed from body-on-frame designs to unibody designs. In unibody designs, all structural parts of the body of the car mechanically form a single structural entity. In modern adhesive dentistry, remaining tooth substance and the dental material form unibody designs, enabling preservation of tooth substance. Biological structures are created to withstand loading and are light in weight. The structural designs of elements in these biological materials are, to a large extent, based on fibrous material. More attention has been paid to mimicking fibrous structures of dental hard tissues by synthetic fiber-reinforced composites. This overview reports key features of natural fibrous elements and how they are utilized in dentistry. Special emphasis is placed on the aspects of interfacial adhesion of restorative materials, especially ceramics to resin-based materials and their role in the unibody design of the tooth-restoration system.


Assuntos
Materiais Biomiméticos/uso terapêutico , Planejamento de Prótese Dentária , Prótese Dentária , Cerâmica/uso terapêutico , Resinas Compostas/uso terapêutico , Cimentos Dentários/uso terapêutico , Materiais Dentários/uso terapêutico , Planejamento de Prótese Dentária/métodos , Restauração Dentária Permanente/métodos , Humanos
14.
Clin Implant Dent Relat Res ; 20(5): 806-813, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-30126038

RESUMO

BACKGROUND: The type of cement used in cemented fixed implant-supported restorations influences formation of undetected excess cement and composition of the peri-implant biofilm. Excess cement and dysbiosis of the biofilm involve the risk of peri-implant inflammation. PURPOSE: The aim of the study was to investigate the impact of two different cements on the peri-implant biofilm and inflammation. MATERIALS AND METHODS: In an observational study, the suprastructures of 34 patients with cemented fixed implant-supported restorations were revised. In 20 patients, a methacrylate cement (Premier Implant cement [PIC]) and in 14 patients, a zinc oxide eugenol cement (Temp Bond [TB]) were used. After revision, TB was used for recementation. During revision and follow-up after 1 year, microbial samples were obtained. RESULTS: Excess cement was found in 12 (60%) of the 20 patients with PIC. Suppuration was observed in two (25%) implants with PIC without excess cement (PIC-) and in all 12 (100%) implants with PIC and excess cement (PIC+). Implants cemented with TB had neither excess cement nor suppuration. The taxonomic analysis of the microbial samples revealed an accumulation of periodontal pathogens in the PIC patients independent of the presence of excess cement. Significantly, fewer oral pathogens occurred in patients with TB compared to patients with PIC. TB was used in all cases (PIC and TB) for recementation. In the follow-up check, suppuration was not found around any of the implants with PIC-, only around one implant with PIC+ and around one implant with TB. Bacterial species associated with severe periodontal infections that were abundant in PIC- and PIC+ samples before the revision were reduced after 1 year to levels found in the TB samples. CONCLUSIONS: The revision and recementation with TB had a positive effect on the peri-implant biofilm in cases with PIC. The cementation of suprastructures on implants with TB is an alternative method to be considered.


Assuntos
Biofilmes/crescimento & desenvolvimento , Cimentos Dentários/uso terapêutico , Implantes Dentários/microbiologia , Peri-Implantite/etiologia , Adulto , Idoso , Cimentos Dentários/efeitos adversos , Implantes Dentários/efeitos adversos , Prótese Dentária Fixada por Implante/efeitos adversos , Prótese Dentária Fixada por Implante/métodos , Restauração Dentária Permanente/efeitos adversos , Restauração Dentária Permanente/métodos , Eugenol/efeitos adversos , Eugenol/uso terapêutico , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Adulto Jovem , Óxido de Zinco/efeitos adversos , Óxido de Zinco/uso terapêutico
15.
Implant Dent ; 27(5): 582-587, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-30134265

RESUMO

PURPOSE: To evaluate Ti-Base abutment height and cement type on the retentiveness of zirconia-based restorations. MATERIAL AND METHODS: Four millimeter (tall) and 2.5-mm-height (short) abutments along with temporary (provisional), glass ionomer (Meron), self-adhesive (U200), and conventional resin cement (Ultimate) were evaluated using pull-out testing (n = 10 crowns/group). RESULTS: Tall and short abutments demonstrated similar retention for all within cement comparisons, except U200 (P = 0.032). Resin cements exhibited superior retentiveness than others (P < 0.01). Although no significant difference was evidenced between resin cements for short abutments, Ultimate evidenced higher retention than U200 for tall abutments (P = 0.043). CONCLUSIONS: Although Ti-Base abutment height has not influenced zirconia superstructures' retentiveness, resin-based cements significantly evidenced higher retention than glass ionomer and temporary cements.


Assuntos
Projeto Auxiliado por Computador , Coroas , Dente Suporte , Cimentos Dentários/uso terapêutico , Projeto do Implante Dentário-Pivô , Planejamento de Prótese Dentária , Zircônio , Planejamento de Prótese Dentária/métodos , Restauração Dentária Permanente/métodos , Análise do Estresse Dentário , Cimentos de Ionômeros de Vidro/uso terapêutico , Humanos , Cimentos de Resina/uso terapêutico
16.
Implant Dent ; 27(5): 555-563, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-30134266

RESUMO

PURPOSE: To investigate the effect(s) of screw-access hole (SAH) in different diameters on the cement-retained implant prosthodontic systems and surrounding cortical bones. MATERIALS AND METHODS: Twenty finite element models were divided into 4 groups: 2 types of full-contour (FC) crowns (Y-TZP, gold alloy) and 2 types of porcelain-fused-to-metal crowns (based on Co-Cr, Au-Pd alloy). For each group, 5 crowns were simulated by varying the diameter of SAH (0, 1, 2, 3, and 4 mm). A vertical load of 200 N and an oblique load of 100 N (45°s) were applied. All models were analyzed with finite element analysis software. RESULTS: The stress on the occlusal surface of crowns was almost unchanged when the SAH was within 0 to 3 mm, whereas it showed an obvious increase when it reached 4 mm. The stress concentration was also suddenly changed from the loading area to the hole margin under vertical loading. As for the screw, a lower stress level was observed in vertical loading when an FC crown with an SAH within 0 to 1 mm was applied. The stress concentration was constantly located at the beginning of the first thread. Stresses of other components remained almost unchanged. CONCLUSIONS: From the aspect of biomechanics, an FC crown with a 1-mm access hole is recommended when a combined cement- and screw-retained crown was used in the posterior region.


Assuntos
Coroas , Cimentos Dentários/uso terapêutico , Projeto do Implante Dentário-Pivô , Implantes Dentários , Prótese Dentária Fixada por Implante , Adulto , Fenômenos Biomecânicos , Osso Cortical/patologia , Análise do Estresse Dentário , Análise de Elementos Finitos , Humanos , Masculino , Mandíbula/patologia
17.
Gen Dent ; 66(4): 51-55, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29964249

RESUMO

This in vitro study evaluated the marginal microleakage of composite inlays luted with 3 different cement systems. The null hypothesis was that the luting materials would not influence dye penetration, showing the same degree of microleakage. Thirty-six sound molars were selected, mesio-occlusodistal cavities were prepared, and the teeth were randomly divided into 3 groups (n = 12). Composite resin inlay restorations were made and cemented using a dual-curing resin cement (Calibra), a light-curing flowable composite (Charisma Flow), or a self-adhesive resin cement (RelyX Unicem). The restored teeth were subjected to fatigue cycles and immersed in 0.5% basic fuchsin dye for 24 hours. Two orthogonal cuts were made to enable evaluation of dye penetration at the cervical and occlusal margins. The sections were evaluated with a 4-point scale ranging from 0 (no penetration) to 3 (penetration up to the cavity floor [occlusal margins] or axial wall [cervical margins]). The Calibra and Charisma Flow groups showed greater microleakage, notably at the cervical margins, whereas RelyX Unicem specimens showed the least dye penetration. Significant differences were found between the Calibra and Charisma Flow groups and between the Charisma Flow and RelyX Unicem groups (P < 0.05). No statistically significant differences were detected between the Calibra and RelyX Unicem groups. The microleakage associated with the flowable composite was significantly greater than that associated with both resin cements, results that discourage its use for luting of Class II composite inlays.


Assuntos
Infiltração Dentária/etiologia , Restaurações Intracoronárias/efeitos adversos , Resinas Compostas/efeitos adversos , Resinas Compostas/uso terapêutico , Cimentos Dentários/uso terapêutico , Falha de Restauração Dentária , Humanos , Técnicas In Vitro , Restaurações Intracoronárias/métodos , Dente Molar/cirurgia , Cimentos de Resina/efeitos adversos , Cimentos de Resina/uso terapêutico
18.
Orthod Fr ; 89(2): 191-197, 2018 06.
Artigo em Francês | MEDLINE | ID: mdl-30040618

RESUMO

INTRODUCTION: Does the new adhesive-coated APC™ Flash-Free bracket from the 3M Unitek® group simplify the bonding protocol without compromising precision? OBJECTIVES: The aim of this study was to compare the morphology of the adhesive joint between the classic APC™ PLUS adhesive-coated brackets and APC™ Flash-Free brackets. MATERIALS AND METHODS: In vitro bonding of esthetic brackets in the CLARITY™ ADVANCED range was performed to compare the morphology of the excess flash between APC™ PLUS and APC™ Flash-Free brackets. RESULTS: No statistically significant difference was found concerning the morphology of the excess flash between APC™ PLUS and APC™ Flash-Free brackets. A statistically significant difference was found regarding the thickness of the adhesive between the two types of bracket. The adhesive used for the APC™ Flash-Free brackets was significantly thicker than for the APC™ PLUS brackets (P=0.0001). Adhesive thickness was also more homogeneous on the APC™ Flash-Free brackets (P=0.001 for the relative difference). CONCLUSION: The adhesive is thicker but adhesive homogeneity is greater with APC™ Flash-Free brackets than with APC™ PLUS brackets.


Assuntos
Cimentos Dentários/análise , Braquetes Ortodônticos , Adesividade , Luzes de Cura Dentária , Colagem Dentária/efeitos adversos , Colagem Dentária/instrumentação , Colagem Dentária/métodos , Cimentos Dentários/efeitos adversos , Cimentos Dentários/química , Cimentos Dentários/uso terapêutico , Humanos , Teste de Materiais , Técnicas de Movimentação Dentária/instrumentação , Técnicas de Movimentação Dentária/métodos
19.
Cochrane Database Syst Rev ; 5: CD003220, 2018 05 31.
Artigo em Inglês | MEDLINE | ID: mdl-29852056

RESUMO

BACKGROUND: In children, dental caries (tooth decay) is among the most prevalent chronic diseases worldwide. Pulp interventions are indicated for extensive tooth decay. Depending on the severity of the disease, three pulp treatment techniques are available: direct pulp capping, pulpotomy and pulpectomy. After treatment, the cavity is filled with a medicament. Materials commonly used include mineral trioxide aggregate (MTA), calcium hydroxide, formocresol or ferric sulphate.This is an update of a Cochrane Review published in 2014 when insufficient evidence was found to clearly identify one superior pulpotomy medicament and technique. OBJECTIVES: To assess the effects of different pulp treatment techniques and associated medicaments for the treatment of extensive decay in primary teeth. SEARCH METHODS: Cochrane Oral Health's Information Specialist searched the Cochrane Oral Health Group's Trials Register (to 10 August 2017), the Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library 2017, Issue 7), MEDLINE Ovid (1946 to 10 August 2017), Embase Ovid (1980 to 10 August 2017) and the Web of Science (1945 to 10 August 2017). OpenGrey was searched for grey literature. The US National Institutes of Health Trials Registry (ClinicalTrials.gov) and the World Health Organization International Clinical Trials Registry Platform were searched for ongoing trials. No restrictions were placed on the language or date of publication when searching the electronic databases. SELECTION CRITERIA: We included randomised controlled trials (RCTs) comparing interventions that combined a pulp treatment technique with a medicament or device in children with extensive decay in the dental pulp of their primary teeth. DATA COLLECTION AND ANALYSIS: Two review authors independently extracted data and assessed 'Risk of bias'. We contacted authors of RCTs for additional information when necessary. The primary outcomes were clinical failure and radiological failure, as defined in trials, at six, 12 and 24 months. We performed data synthesis with pair-wise meta-analyses using fixed-effect models. We assessed statistical heterogeneity by using I² coefficients. MAIN RESULTS: We included 40 new trials bringing the total to 87 included trials (7140 randomised teeth) for this update. All were small, single-centre trials (median number of randomised teeth = 68). All trials were assessed at unclear or high risk of bias.The 87 trials examined 125 different comparisons: 75 comparisons of different medicaments or techniques for pulpotomy; 25 comparisons of different medicaments for pulpectomy; four comparisons of pulpotomy and pulpectomy; and 21 comparisons of different medicaments for direct pulp capping.The proportion of clinical failures and radiological failures was low in all trials. In many trials, there were either no clinical failures or no radiographic failures in either study arm.For pulpotomy, we assessed three comparisons as providing moderate-quality evidence. Compared with formocresol, MTA reduced both clinical and radiological failures, with a statistically significant difference at 12 months for clinical failure and at six, 12 and 24 months for radiological failure (12 trials, 740 participants). Compared with calcium hydroxide, MTA reduced both clinical and radiological failures, with statistically significant differences for clinical failure at 12 and 24 months. MTA also appeared to reduce radiological failure at six, 12 and 24 months (four trials, 150 participants) (low-quality evidence). When comparing calcium hydroxide with formocresol, there was a statistically significant difference in favour of formocresol for clinical failure at six and 12 months and radiological failure at six, 12 and 24 months (six trials (one with no failures), 332 participants).Regarding pulpectomy, we found moderate-quality evidence for two comparisons. The comparison between Metapex and zinc oxide and eugenol (ZOE) paste was inconclusive, with no clear evidence of a difference between the interventions for failure at 6 or 12 months (two trials, 62 participants). Similarly inconclusive, there was no clear evidence of a difference in failure between Endoflas and ZOE (outcomes measured at 6 months; two trials, 80 participants). There was low-quality evidence of a difference in failure at 12 months that suggested ZOE paste may be better than Vitapex (calcium hydroxide/iodoform) paste (two trials, 161 participants).Regarding direct pulp capping, the small number of studies undertaking the same comparison limits any interpretation. We assessed the quality of the evidence as low or very low for all comparisons. One trial appeared to favour formocresol over calcium hydroxide; however, there are safety concerns about formocresol. AUTHORS' CONCLUSIONS: Pulp treatment for extensive decay in primary teeth is generally successful. Many included trials had no clinical or radiological failures in either trial arm, and the overall proportion of failures was low. Any future trials in this area would require a very large sample size and follow up of a minimum of one year.The evidence suggests MTA may be the most efficacious medicament to heal the root pulp after pulpotomy of a deciduous tooth. As MTA is relatively expensive, future research could be undertaken to confirm if Biodentine, enamel matrix derivative, laser treatment or Ankaferd Blood Stopper are acceptable second choices, and whether, where none of these treatments can be used, application of sodium hypochlorite is the safest option. Formocresol, though effective, has known concerns about toxicity.Regarding pulpectomy, there is no conclusive evidence that one medicament or technique is superior to another, and so the choice of medicament remains at the clinician's discretion. Research could be undertaken to confirm if ZOE paste is more effective than Vitapex and to evaluate other alternatives.Regarding direct pulp capping, the small number of studies and low quality of the evidence limited interpretation. Formocresol may be more successful than calcium hydroxide; however, given its toxicity, any future research should focus on alternatives.


Assuntos
Cárie Dentária/terapia , Dente Molar , Pulpectomia/métodos , Pulpotomia/métodos , Dente Decíduo , Compostos de Alumínio/uso terapêutico , Compostos de Cálcio/uso terapêutico , Hidróxido de Cálcio/uso terapêutico , Criança , Pré-Escolar , Ensaios Clínicos Controlados como Assunto , Cimentos Dentários/uso terapêutico , Materiais Dentários/uso terapêutico , Combinação de Medicamentos , Terapia por Estimulação Elétrica , Compostos Férricos/uso terapêutico , Formocresóis/uso terapêutico , Humanos , Óxidos/uso terapêutico , Ensaios Clínicos Controlados Aleatórios como Assunto , Silicatos/uso terapêutico , Falha de Tratamento , Cimento de Óxido de Zinco e Eugenol/uso terapêutico
20.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 53(6): 374-380, 2018 Jun 09.
Artigo em Chinês | MEDLINE | ID: mdl-29886630

RESUMO

The longevity of direct adhesive restoration is related to the restorative materials, the patient and the professional. On one hand, dental composites/adhesives have been modified and developed to fulfill the criteria for clinical application. On the other hand, the clinical guidelines for adhesive restorations have been released and updated accordingly, which would prolong the longevity of restorations. In this commentary, the removal of carious tissues, interface preparation for bonding and application of adhesives are emphasized. The administrative measures for registration and clinical evaluation criteria for adhesive restorative material are also introduced.


Assuntos
Materiais Dentários/normas , Restauração Dentária Permanente/métodos , Colagem Dentária , Cimentos Dentários/normas , Cimentos Dentários/uso terapêutico , Adaptação Marginal Dentária , Materiais Dentários/uso terapêutico , Restauração Dentária Permanente/normas , Adesivos Dentinários , Humanos
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