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1.
J Contemp Dent Pract ; 21(3): 233-237, 2020 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-32434966

RESUMO

AIM: The aim of this study was to assess the impact of acidic drink on the microhardness of different esthetic restorative materials. MATERIALS AND METHODS: Sixty samples (20 samples of each group) were prepared. group I: nanohybrid ormocer-based composite, group II: glasiosite compomer, and group III: nanoceramic composite. A cylindrical aluminum mold of 5 mm depth and 10 mm internal diameter was used to prepare the samples. All the esthetic restorative samples were submerged in 25 mL of acidic drink (Coca-Cola) for 10 minutes each day up to 15 days. The microhardness of each sample was measured using a Vickers diamond intender. These values were matched with baseline, 7th day, and 15th day for final microhardness values. RESULTS: The mean surface microhardness of 61.13 ± 0.82 was shown by group I, which was slightly more than that in group II (59.65 ± 1.16) and group III (59.22 ± 1.30). Analysis of covariance did not show any statistically significant difference between the groups. The samples in group III showed the highest reduction in surface microhardness value after immersion into acidic drink, followed by group II and group I on 7th day and 15th day. A statistically significant difference (p < 0.001) was found on 7th day. CONCLUSION: The present study concludes that the esthetic restorative material-nanohybrid ormocer-based composite-showed the finest behavior both before and after being dipped in the acidic drink followed next by glasiosite compomer and nanoceramic composite. CLINICAL SIGNIFICANCE: The various esthetic restorative materials with different physical characteristics and colors are marketed in numerous ways. Nevertheless, all dental restorative materials show surface degradation under acidic conditions over a period of time. So, it helps to know the surface microhardness changes of various esthetic restorative materials upon repeated exposure to acidic beverages.


Assuntos
Bebidas , Compômeros , Estética Dentária , Dureza , Concentração de Íons de Hidrogênio , Teste de Materiais , Cerâmicas Modificadas Organicamente
2.
Niger J Clin Pract ; 23(5): 610-618, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-32367866

RESUMO

Objective: The purpose of this study was to evaluate the effects of different pediatric drugs and toothbrushing on color changes of restorative materials used in pediatric dentistry. Materials and Methods: Sixty specimens were prepared from each of three restorative materials (compomer [Dyract XP], glass hybrid [Equia Forte], and glass carbomer [GCP Glass Fill]). Specimens were divided into six solution groups (n = 10) and immersed in five different pediatric drugs (antibiotic, analgesic, common cold syrup, cough syrup, and an iron and vitamin formula) and distilled water. Two subgroups (brushed and unbrushed) were established for each group (n = 5). Specimens were agitated for 1 min every 8 h over 2 weeks. Color changes [CIEDE2000 (ΔE00)] were calculated at baseline, 7, and 14 days. Data were subjected to 4-factor mixed-design ANOVA using a general linear model procedure for repeated measurements. Results: After 14 days, the highest ΔE00was found in the compomer/non-brushing group immersed in iron and vitamin formula (5.6 ± 0.27), and the lowest was in glass hybrid/brushing group immersed in distilled water (0.59 ± 0.8) pairwise. ΔE00values were significantly greater for compomer than for glass hybrid or glass carbomer (P < 0.05). There were statistically significant differences between the brushing and non-brushing groups for all tested solutions on the compomer specimens (except antibiotic) and glass hybrid specimens (except antibiotic and cough syrup). The Δ00 values in brushing groups were significantly lower statistically than in non-brushing groups (P < 0.05). Conclusions: Toothbrushing dramatically affected the color stability of the aesthetic restorative materials. The content of pediatric drugs is also an important factor for color change. Glass hybrids and glass carbomers used with their surface sealants appeared to be more resistant to staining from pediatric drug formulations than compomers.


Assuntos
Materiais Dentários , Restauração Dentária Permanente , Escovação Dentária , Apatitas , Criança , Cor , Compômeros , Estética Dentária , Cimentos de Ionômeros de Vidro/química , Humanos , Teste de Materiais , Odontopediatria
3.
Oper Dent ; 45(3): 255-264, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-31995425

RESUMO

BACKGROUND AND OBJECTIVES: Information on the choice of material and performance of restorations placed in a dental practice annually is limited. The Minamata Convention on Mercury is likely to affect the use of amalgam worldwide. The objective of this research was to investigate the use of restorative materials at the University of Otago Faculty of Dentistry in New Zealand from 1998 to 2017. METHODS: Data from the Faculty of Dentistry's database from the years of interest were compiled. These data included information on the characteristics of restorations, including information on the material used and number of surfaces involved for each restoration. The tooth in which each restoration was placed was categorized by arch, tooth type, and deciduous or permanent dentition. RESULTS: Records identified 227,514 permanent restorations placed from January 1998 to December 2017, of which 91.7% were direct restorations. Among direct restorations, composite resin was the most commonly used material, followed by amalgam, glass ionomer, and compomer. The use of amalgam for direct restorations decreased from 52.3% of direct restorations in 1998 to 7.1% in 2017. A corresponding increase was observed in the use of tooth-colored direct restorations, particularly composites. Among indirect restorations, porcelain fused to metal, gold, and stainless steel (in pediatric applications) were the materials most frequently used. CONCLUSIONS: Despite having no official policy on reducing the use of dental amalgam, the Faculty of Dentistry is following the global trend in reducing its use, with composite resin now well established as the predominant restorative material used. If the current rate of decline persists unchecked, the Faculty of Dentistry could transition to being amalgam free by 2020, although it seems likely that the characteristics and principles of use of the material (and its removal) will be taught for some time to come. This knowledge is important to planning curriculum changes needed to prepare graduates for clinical practice.


Assuntos
Amálgama Dentário , Restauração Dentária Permanente , Criança , Compômeros , Resinas Compostas , Humanos , Nova Zelândia
4.
Clin Oral Investig ; 24(1): 141-150, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31053896

RESUMO

OBJECTIVES: The aims of this study were (i) to assess cumulative survival rates of class II resin-based composite and compomer restorations in primary molars with a 5-year observation period and (ii) to analyze the influence of different types of anesthesia and different localizations of the restorations in the teeth. METHODS: Patient charts of a private practice for pediatric dentistry were screened for class II resin-based composite (Spectrum TPH3) and compomer (Dyract Posterior; both Dentsply DeTrey) restorations in primary molars with a 5-year observation period used with Adper Prompt L-Pop (3M-ESPE). One restoration per patient (age ≤ 6 years at placement) was randomly selected. RESULTS: Two hundred sixty restorations were included (43% resin-based composites, 57% compomers). After 5 years, cumulative survival rates were 43% for resin-based composite and 49% for compomer restorations with no statistically significant differences. There was a tendency for higher survival rates for restorations placed under N2O inhalation sedation or general anesthesia. Distal-occlusal compomer restorations showed significantly lower survival rates (p = 0.003) as compared to mesial-occlusal compomer restorations. CONCLUSION: Within the limitations of the study, we conclude that type of restorative material as well as the type of anesthesia do not influence restoration survival rates, although restorations placed in patients receiving N2O inhalation sedation or general anesthesia tend to perform better as compared with patients receiving no anesthesia or only local infiltration. CLINICAL RELEVANCE: Resin-based composite and compomer restorations show similar survival rates of more than 43% (annual failure rates less than 11.5%) after 5 years for restoration of primary molars.


Assuntos
Anestesia/métodos , Cárie Dentária , Criança , Compômeros , Resinas Compostas , Falha de Restauração Dentária , Restauração Dentária Permanente , Seguimentos , Cimentos de Ionômeros de Vidro , Humanos , Estudos Retrospectivos
5.
Niger J Clin Pract ; 22(7): 961-970, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31293262

RESUMO

Background: The aim of this study was to evaluate six different glass ionomer cement (GIC)-based restorative materials through comparisons of microleakage and fluoride release. Materials and Methods: For microleakage, 30 teeth were randomly separated into 6 groups of 5: Group 1 (Dyract: compomer), Group 2 (Freedom: compomer), Group 3 (Equia: high-viscosity glass ionomer cements), Group 4 (Fuji IX: resin-modified glass ionomer cement), Group 5 (Ketac Molar: traditional glass ionomer cement [TGIC]) and Group 6 (Voco: TGIC). For fluoride release of six different GIC-based restorative materials, standard samples were prepared of 4 mm thickness and 7 mm diameter. A total of 60 samples were obtained as 10 samples from each group. The analyses were made using a Thermo Orion 720 A+ ionometer with the Orion fluoride electrode. At the end of 24 h, 72 h, 7 days, 14 days, and 30 days, the electrode was placed into the dish containing the sample, distilled water, and TISAB II; a reading was taken; and the value shown on the screen was recorded. Results: For microleakage, a statistically significant difference was determined between the groups in respect of the occlusal variable (P < 0.05), no statistically significant gingival variable (P > 0.05). About fluoride release: According to the repeated measures variance analysis results, the difference between the groups, and between the time-group interaction and according to time, was found to be statistically significant (P < 0.05). Conclusions: In terms of microleakage, it was concluded that all materials could be used in clinical applications. The Equia high-viscosity glass ionomer cements (HVGIC) was determined to be the material with the highest fluoride release value.


Assuntos
Compômeros/química , Infiltração Dentária , Restauração Dentária Permanente/métodos , Fluoretos/química , Cimentos de Ionômeros de Vidro/química , Colagem Dentária , Adesivos Dentinários , Humanos , Teste de Materiais
6.
J Adhes Dent ; 21(3): 247-254, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31093618

RESUMO

PURPOSE: To evaluate the clinical performance of a flowable bulk-fill composite vs a compomer in Class II cavities of primary molars. MATERIALS AND METHODS: In a clinical study, 100 restorations were placed in two randomly assigned comparable Class II cavities in 32 children (aged 6.7 ± 1.2 years) with at least one bulk-fill composite (Venus Bulk Fill, Heraeus Kulzer) and one compomer (Dyract eXtra, Dentsply). After caries excavation, the adhesive Scotchbond Universal (3M Oral Care) was applied in self-etching mode. According to the manufacturer's instructions, Venus Bulk Fill was used for the entire Class II cavity of primary molars without a cover layer. After visible-light curing, both restorations were finished and polished. Both restorative materials were evaluated at baseline and after one year, including esthetic, functional, and biological parameters, using the FDI criteria. The Mann-Whitney U-test was used to determine the difference in the complete scores at baseline and after one year (p < 0.05). RESULTS: After one year, 99 restorations were reevaluated; one tooth had exfoliated physiologically. Concerning the esthetic parameters, Dyract eXtra showed slightly higher scores than Venus Bulk Fill. Both materials showed similar scores regarding functional and biological parameters. No severe postoperative sensitivities or side-effects were reported. There was no statistically significant difference between the performance of Venus Bulk Fill and Dyract eXtra for primary molars. CONCLUSION: The flowable bulk-fill composite Venus Bulk Fill can be considered as an alternative material for clinical use in primary teeth, but longer-term studies might still be needed.


Assuntos
Compômeros , Resinas Compostas , Restauração Dentária Permanente , Criança , Pré-Escolar , Materiais Dentários , Humanos , Dente Molar , Dente Decíduo
7.
Comput Methods Biomech Biomed Engin ; 22(10): 936-941, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-30999769

RESUMO

Resin onlay restoration is an esthetic alternative technique used for restoring extensively damaged primary molars. Understanding the behavior of materials under repeated functional stress and how the stress is transmitted to the remaining tooth structure is important. The aim of this study was to compare stresses in primary molars restored with indirect composite and compomer onlay. 3D frame models of the right mandibular and maxillary primary molars and the alveolar bone were created using computerized tomography images of a six-year-old girl. The enamel and dentine layers above the cement layer were unified to generate onlay restoration, and composite and compomer were used as restorative materials. The vertical occlusal load (100 N) was applied to the teeth in the occlusal contact areas. The von Mises stress distributions and normal stress distributions of the y-axis (parallel to the long axis of tooth) were evaluated. The occlusal stress is transmitted to the cervical part of healthy teeth by spreading it through the enamel layer. The composite and compomer restorative materials exhibited similar stress distribution patterns. An indirect technique creates a structure similar to the original morphological form, and it allows restorations to distribute high occlusal stresses and to minimize possible breakages.


Assuntos
Compômeros/farmacologia , Análise de Elementos Finitos , Restaurações Intracoronárias , Dente Molar/efeitos dos fármacos , Criança , Força Compressiva , Coroas , Esmalte Dentário/efeitos dos fármacos , Análise do Estresse Dentário , Dentina/efeitos dos fármacos , Feminino , Humanos , Imageamento Tridimensional , Modelos Anatômicos , Dente Molar/anatomia & histologia , Resistência à Tração
8.
J Appl Biomater Funct Mater ; 17(1): 2280800019827805, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30803300

RESUMO

AIM:: Incomplete polymerization of a resin material used for dental restoration affects the properties of the restoration. We evaluated the structural and mechanical properties of three different colored compomers cured with three different LED units to observe the characteristic changes occurring in different matches. METHODS:: Polytetrafluoroethylene molds (5 mm in diameter and 2 mm in thickness) were used to prepare disk-shaped sample specimens. Nine sample groups (each of five specimens) were prepared, three each of different compomer resin colors (gold, berry, and silver). Samples were cured using three different LED units (Optima, VALO, and Demi Ultra), according to the manufacturers' instructions. Microstructural properties of samples were characterized by determining the degree of curing using Fourier-transform infrared spectroscopy and by analyzing sample morphology under a scanning electron microscope. The Vickers hardness, compressive strength, and elastic modulus of the samples were measured to investigate their mechanical properties. RESULTS:: The degrees of curing decreased in the order of silver > berry > gold for all curing units. Conversely, gold compomers exhibited poorer mechanical values than the berry and silver counterparts. The Optima 10 unit yielded slightly higher degrees of curing than the other devices, followed by Demi Ultra and VALO light-curing units, respectively. CONCLUSION:: The resin color affected the structural and mechanical properties of the compomers, possibly as a result of the complex interactions and relationships between the irradiation light and resin material, such as light absorbance and reflectance; thus, depending on the color as well as the curing protocol.


Assuntos
Compômeros/química , Cor , Módulo de Elasticidade , Dureza , Microscopia Eletrônica de Varredura , Politetrafluoretileno/química , Espectroscopia de Infravermelho com Transformada de Fourier
9.
Dent Mater J ; 38(1): 33-40, 2019 Feb 08.
Artigo em Inglês | MEDLINE | ID: mdl-30298856

RESUMO

This study investigates the effects of various beverages on the wettability, microhardness, and color stability of aesthetic dental restorative materials. A contact angle analyzer, Vickers hardness tester, and spectrophotometer were used to characterize the properties of the materials and a total of 225 specimens were prepared: 75 each for a resin composite, compomer, and giomer. Ingestion of energy drinks and cola caused the greatest deterioration in wettability and microhardness, and coffee caused the most significant color change. In addition, the change in the resin composite was lower than that of the other restorative materials. The extent of change in the restorative materials increased with duration and frequency of contact with the beverages, so a reduction in the frequency of ingestion of these beverages is recommended.


Assuntos
Bebidas , Cor , Compômeros/química , Resinas Compostas/química , Materiais Dentários/química , Cimentos de Ionômeros de Vidro/química , Dureza , Concentração de Íons de Hidrogênio , Teste de Materiais , Propriedades de Superfície , Molhabilidade
10.
Clin Oral Investig ; 23(4): 1761-1770, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30171345

RESUMO

OBJECTIVE: To evaluate the survival of atraumatic restorative treatment (ART) restorations using high viscosity glass ionomer cement (GIC), compomer (COM), and glass carbomer (CAR) for occlusal and occlusoproximal cavitated dentin caries lesions in primary molars. METHODS: A total of 568 4-7-year-old children (287 occlusoproximal and 281 occlusal cavities) were selected in Barueri, Brazil. The patients were randomly allocated in three groups: GIC, COM, and CAR. All treatments were performed on school setting following ART premises. Evaluations were performed after 2, 6, 12, 18, 24, and 36 months. Restoration survival was evaluated using Kaplan-Meier survival analysis and log-rank test, while Cox regression analysis was used for testing association with clinical factors (α = 5%). RESULTS: The overall survival rate after 3 years of occlusal ART restorations was 73% (GIC = 83%; COM = 78%; CAR = 62%) and 49% for occlusoproximal ART restorations (GIC = 56%; COM = 56%; CAR = 36%). CAR restorations were less successful than GIC and COM for both occlusal and occlusoproximal restorations (p < 0.05). No difference was found between GIC and COM (p > 0.05). CONCLUSIONS: GIC and compomer are clinically more successful than CAR for occlusal and occlusoproximal restorations in primary molars. CLINICAL SIGNIFICANCE: Both compomer and high viscosity glass ionomer cement are suitable materials for ART in primary molars. However, glass carbomer cement should not be used for ART (#NCT02217098).


Assuntos
Apatitas , Compômeros , Tratamento Dentário Restaurador sem Trauma , Cárie Dentária/terapia , Cimentos de Ionômeros de Vidro , Resinas Acrílicas , Brasil , Criança , Falha de Restauração Dentária , Restauração Dentária Permanente , Humanos
11.
Oral Health Prev Dent ; 16(5): 431-438, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30460356

RESUMO

PURPOSE: To understand the effect of the addition of hydroxyapatite (HA) and bioactive glass (BAG) to compomer restorative materials on the remineralisation capacity of the material. MATERIALS AND METHODS: 1%, 2%, 3% and 4% w/w HA and BAG particles were added mechanically to the compomers. To examine the resistance to demineralisation, Class V cavities were prepared in extracted teeth and restored with experimental filling materials. Demineralised lesions were created in 72 enamel samples. Vickers microhardness measurements of samples were performed at three different areas including the margin of the restoration, the varnish-protected enamel and the exposed enamel areas. Measurements performed on protected enamel were used as reference enamel values for each group. SEM was used to evaluate the surface texture of the specimens. The statistical analyses were performed by one-way ANOVA, Tukey's HDS and paired-samples t-tests. RESULTS: BAG and HA groups revealed higher microhardness values at the exposed enamel and exposed marginal enamel than did the control group (p = 0.001). 3% and 4% HA and BAG groups produced higher microhardness values than did 1% modified groups on exposed enamel (p = 0.001). 4% HA group revealed the highest microhardness values on marginal exposed enamel (p = 0.001). 2%, 3%, 4% and HA, as well as 3% and 4% BAG groups showed higher microhardness values than did the control group on marginal exposed enamel at 20 µm depth (p = 0.001). SEM images revealed that HA and BAG particles were not distributed homogeneously and the particles seemed to be grouped in the matrix. CONCLUSIONS: Within the limits of this study, the addition of the BAG and HA into compomers improved the demineralisation resistance properties of enamel, depending on the amount of additive.


Assuntos
Materiais Biocompatíveis/uso terapêutico , Compômeros/uso terapêutico , Cárie Dentária/terapia , Esmalte Dentário/ultraestrutura , Durapatita/uso terapêutico , Vidro , Remineralização Dentária/métodos , Materiais Dentários/uso terapêutico , Dureza , Testes de Dureza , Humanos , Técnicas In Vitro , Microscopia Eletrônica de Varredura
12.
Pediatr Dent ; 40(5): 370-374, 2018 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-30355434

RESUMO

Purpose: Polymerization shrinkage stress is determined by shrinkage as well as elastic modulus. Elastic modulus develops during polymerization. This study evaluated how elastic modulus affects shrinkage stresses in a primary molar for three types of restorative materials. Methods: Elastic modulus of resin composite, compomers, and resin-modified glass ionomer (RMGI) were determined using four-point bending of rectangular beams at 10 minutes, 24 hours, and after one to four weeks storage in water (n equals 10). Results were analyzed using twoway analysis of variance and pairwise comparisons (α equals 0.05). The elastic moduli were used with published shrinkage data to calculate stresses at the tooth-restoration interface in finite element models of a cross-sectioned restored primary molar. Results: The elastic modulus ranged between 5.6 to 19.9 gigapascal. Elastic modulus values were lowest at 10 minutes, regardless of material, and increased significantly (43 to 95 percent) in 24 hours; RMGI continued to increase (64 percent) for one week. Shrinkage stresses increased nonproportionally (resin composite 31 percent, compomer 35 percent, RMGI 52 percent) with increasing elastic modulus for sustained volumetric shrinkage. Conclusions: Elastic modulus development is material dependent and an important factor in polymerization shrinkage stress. Maturation of restorative materials can cause long-lasting stress increases if shrinkage is not alleviated by hygroscopic expansion.


Assuntos
Materiais Dentários , Restauração Dentária Permanente/instrumentação , Análise do Estresse Dentário , Módulo de Elasticidade/fisiologia , Dente Molar/cirurgia , Dente Decíduo/cirurgia , Compômeros , Resinas Compostas , Restauração Dentária Permanente/métodos , Análise de Elementos Finitos , Cimentos de Ionômeros de Vidro , Humanos , Polimerização
13.
Microsc Res Tech ; 81(12): 1422-1433, 2018 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-30295386

RESUMO

The aim of the study was to evaluate of surface roughness and color changes of the resin-based five restorative dental materials after aging in liquids at different pH values. Totally 250 specimens were prepared, including 50 specimens for the each material group from five different restorative materials (G1[Filtek Z550], G2[Beautifil II], G3[Vertise Flow], G4[Dyract XP], G5[GCFujiIILC]), using the 10-mm diameter and 2-mm thickness molds. A total of 50 specimens in the each group, were divided into five subgroups (n = 10) to be immerse into five liquids at different pH. After initial color and roughness measurements, samples were stored in the same liquids for 7 and 14 days and all of the measurements were repeated on the 7th and 14th days. scanning electron microscopy and atomic force microscopy analyses were performed in the all groups. When the color change(ΔE) results are examined statistically; most of the ΔE is in Fuji II LC; and at least in Filtek Z550, it was determined that cola and gastric acid had the greatest effect on ΔE averages and showed significant differences (p < .05). When the average roughness values(Ra) are analyzed statistically, the highest values were found in Fuji II LC and the lowest values were found in Filtek Z550 (p < .05). The liquids which had the highest roughness average (ΔRa) were statistically significant and gastric acid and orange juice were the most effective ones (p < .05). Asidic beverages significantly increased the surface roughness and discoloration of dental restorative materials. RESEARCH HIGHLIGHTS: The results of this research showed that dental restorative materials, which are resin-based, affected both the color and surface roughness after waiting in the low pH value beverages. These results are supported with the scanning electron microscopy and atomic force microscopy images in our research. Clinically, this situation will create esthetic and functional problems in the dental filling restorations. For this reason, the results of this study seem to be important and we think that this article could be contribute to the literature.


Assuntos
Resinas Sintéticas/química , Cor , Compômeros/química , Resinas Compostas/química , Cimentos de Ionômeros de Vidro/química , Concentração de Íons de Hidrogênio , Microscopia de Força Atômica , Microscopia Eletrônica de Varredura , Propriedades de Superfície
14.
Niger J Clin Pract ; 21(8): 1034-1037, 2018 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-30074007

RESUMO

Aim: Using AutoCAD, we examined the microleakage of dye at the edges of primary-teeth restorations using three glass ionomer-based restorative materials. Materials and Methods: A total of 30 extracted noncarious primary molars were used. Class V cavities were adjusted on the buccal surfaces. The teeth were randomly divided into three groups of 10 teeth each as follows: Group A (Ketac Molar), Group B (Photac Fil), and Group C (Dyract XP). All specimens were stored for 24 h at 37°C in distilled water. The teeth were thermocycled 1000 times between 5°C ± 2°C and 55°C ± 2°C before immersion in 0.5% basic fuchsin for 24 h. Two mesiodistal cuts of each tooth were photographed under a stereomicroscope equipped with a digital camera. The dye-infiltrated surface area was measured. Statistical evaluations were performed by the Kolmogorov-Smirnov test, Levene test, one-way analysis of variance, and Tukey's honestly significant difference test. Results: The mean microleakage ratio differed significantly among the groups (P < 0.05). Group C exhibited a significantly smaller area (P < 0.001) than the other groups. Group A had a nonsignificantly higher mean microleakage value than Group B (P > 0.05). Conclusions: Polyacid-modified composite resin may be a useful restorative material in primary teeth in terms of minimizing microleakage.


Assuntos
Resinas Acrílicas , Infiltração Dentária , Restauração Dentária Permanente/métodos , Cimentos de Ionômeros de Vidro/química , Dióxido de Silício , Compômeros , Resinas Compostas , Materiais Dentários , Humanos , Dente Molar , Resinas Sintéticas , Dente Decíduo
15.
Cochrane Database Syst Rev ; 4: CD002282, 2018 04 09.
Artigo em Inglês | MEDLINE | ID: mdl-29630138

RESUMO

BACKGROUND: Bonding of orthodontic brackets to teeth is important to enable effective and efficient treatment with fixed appliances. The problem is bracket failure during treatment which increases operator chairside time and lengthens treatment time. A prolonged treatment is likely to increase the oral health risks of orthodontic treatment with fixed appliances one of which is irreversible enamel decalcification. This is an update of the Cochrane Review first published in 2003. A new full search was conducted on 26 September 2017 but no new studies were identified. We have only updated the search methods section in this new version. The conclusions of this Cochrane Review remain the same. OBJECTIVES: To evaluate the effects of different orthodontic adhesives for bonding. SEARCH METHODS: Cochrane Oral Health's Information Specialist searched the following databases: Cochrane Oral Health's Trials Register (to 26 September 2017), the Cochrane Central Register of Controlled Trials (CENTRAL; 2017, Issue 8) in the Cochrane Library (searched 26 September 2017), MEDLINE Ovid (1946 to 26 September 2017), and Embase Ovid (1980 to 26 September 2017). The US National Institutes of Health Ongoing Trials Register (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: Trials were selected if they met the following criteria: randomised controlled trials (RCTs) and controlled clinical trials (CCTs) comparing two different adhesive groups. Participants were patients with fixed orthodontic appliances. The interventions were adhesives that bonded stainless steel brackets to all teeth except the molars. The primary outcome was debond or bracket failure. DATA COLLECTION AND ANALYSIS: Data were recorded on decalcification as a secondary outcome, if present. Information regarding methods, participants, interventions, outcome measures and results were extracted in duplicate by pairs of review authors. Since the data were not presented in a form that was amenable to meta-analysis, the results of the review are presented in narrative form only. MAIN RESULTS: Three trials satisfied the inclusion criteria. A chemical cured composite was compared with a light cured composite (one trial), a conventional glass ionomer cement (one trial) and a polyacid-modified resin composite (compomer) (one trial). The quality of the trial reports was generally poor. AUTHORS' CONCLUSIONS: There is no clear evidence on which to make a clinical decision of the type of orthodontic adhesive to use.


Assuntos
Colagem Dentária , Cimentos Dentários , Braquetes Ortodônticos , Compômeros , Descalcificação Patológica , Cimentos de Ionômeros de Vidro , Humanos , Ensaios Clínicos Controlados Aleatórios como Assunto
16.
J Contemp Dent Pract ; 19(2): 189-195, 2018 02 01.
Artigo em Inglês | MEDLINE | ID: mdl-29422469

RESUMO

AIM: This study evaluated the influence of various doses of radiotherapy on the microtensile bond strength (pTBS) of compomer resin to dentin and enamel in primary molars. MATERIALS AND METHODS: Thirty-five intact primary molars were collected and divided into seven groups. Teeth were irradiated with doses from 10 to 60 Gy, except for the control group. Compomer restorations were performed, and enamel-compomer resin beams and dentin-compomer resin beams were tested at a crosshead speed of 1 mm/min. RESULTS: No statistically significant difference was found between the irradiated tooth enamel and the control group (F = 1.1468; p = 0.194). However, statistically significant differences were evident among the dentin groups (F = 11.050; p < 0.001). CONCLUSION: Radiation may not cause a significant difference in the pTBS of compomer resin to primary tooth enamel, but appears to dose dependently decrease its bond strength to primary tooth dentin. CLINICAL SIGNIFICANCE: Radiotherapy may affect the success rate of compomer fillings in primary teeth, especially in deeper cavities with exposed dentin.


Assuntos
Compômeros/química , Esmalte Dentário/efeitos da radiação , Adesivos Dentinários/química , Dentina/efeitos da radiação , Dente Molar/efeitos da radiação , Cimentos de Resina/química , Colagem Dentária , Humanos , Técnicas In Vitro , Microscopia Eletrônica de Varredura , Propriedades de Superfície , Resistência à Tração , Dente Decíduo
17.
J Esthet Restor Dent ; 30(2): E52-E60, 2018 03.
Artigo em Inglês | MEDLINE | ID: mdl-29247591

RESUMO

OBJECTIVE: The purpose of this study was to evaluate the influence of study protocols on the effects of bleaching on the surface roughness, substance loss, flexural strength (FS), flexural modulus (FM), Weibull parameters, and color of 7 restorative materials. MATERIALS AND METHODS: The test materials included 4 composite resins, 1 glass-ionomer cement, 1 dental ceramic, and 1 polyacid-modified composite. The specimens were randomly divided into 4 groups (n = 20) according to different study protocols: a bleaching group at 25°C (group 25B), a bleaching group at 37°C (group 37B), a control group at 25°C (group 25C), and a control group at 37°C (group 37C). The specimens in the bleaching group were treated with 40% hydrogen peroxide for 80 min at the respective environmental temperatures. The surface roughness, substance loss, FS, FM, and color of the specimens were measured before and after treatment. FS data were also subjected to Weibull analysis, which was used to estimate of the Weibull modulus (m) and the characteristic strength (σ0 ). RESULTS: Surface roughness increased and significant color changes were observed for all tested specimens after bleaching treatment, except for the ceramic. After bleaching at 37°C, the polyacid-modified composite showed significantly reduced FS, FM, m, and σ0 values in comparison to the control specimens stored at 37°C in whole saliva. Significant differences were also found between the 37B and 25B polyacid-modified composite groups in terms of surface roughness, FS, m, σ0 , and color changes. CONCLUSIONS: Varying effects of bleaching on the physical properties of dental restorative materials were observed, and the influences of the study protocols on bleaching effects were found to be material-dependent. CLINICAL SIGNIFICANCE: The influence of study protocols on the effects of bleaching on the surface roughness, flexural properties, and color of dental restorative materials are material-dependent and should be considered when evaluating the effects of bleaching on dental restorative materials.


Assuntos
Peróxido de Hidrogênio , Clareamento Dental , Peróxido de Carbamida , Compômeros , Resinas Compostas , Restauração Dentária Permanente , Cimentos de Ionômeros de Vidro , Teste de Materiais , Peróxidos , Propriedades de Superfície , Ureia
18.
Dent Mater J ; 37(2): 293-300, 2018 Mar 30.
Artigo em Inglês | MEDLINE | ID: mdl-29279547

RESUMO

This study aimed to evaluate and compare certain mechanical properties, Vickers-hardness, water sorption, fluoride-release, shrinkage-stress and wear of five commercial fluoride-releasing restorative materials (Dyract, CompGlass, BEAUTIFIL II, ACTIVA-Restorative, and GC Fuji II LC), in relation to their microstructural characteristics. Mechanical properties were determined for each material following ISO standards. A wear test was conducted with 15,000 chewing cycles using a dual-axis chewing simulator. Daily fluoride-release was measured during the first 10 days by using a fluoride ion selective electrode. Scanning electron microscopy (SEM) was used to evaluate the microstructure of each material. Results were statistically analysed using ANOVA followed by post hoc Tukey's test. ACTIVA-Restorative exhibited the highest fracture toughness (1.1 MPa m1/2) among the materials tested. BEAUTIFIL II presented the highest flexural strength (145 MPa) which was not significantly different (p>0.05) from CompGlass and Dyract. Highest fluoride-release measurement was located for GC Fuji II LC among other tested materials.


Assuntos
Compômeros/química , Resinas Compostas/química , Materiais Dentários/química , Fluoretos/química , Cimentos de Ionômeros de Vidro/química , Bis-Fenol A-Glicidil Metacrilato , Falha de Restauração Dentária , Dureza , Eletrodos Íon-Seletivos , Teste de Materiais , Microscopia Eletrônica de Varredura , Propriedades de Superfície
19.
ARS med. (Santiago, En línea) ; 43(2): 33-41, 2018. Tab
Artigo em Espanhol | LILACS | ID: biblio-1022877

RESUMO

Las lesiones cervicales no cariosas son condiciones patológicas no bacterianas localizadas en el límite amelocementario de los dientes. Los principales biomateriales descritos para el tratamiento restaurador de estas lesiones son: vidrios ionómeros, vidrios ionómeros modificados con resinas, compómeros y resinas compuestas. El objetivo de este protocolo, consiste en establecer los elementos metodológicos de una revisión sistemática que evaluará el comportamiento clínico de restauraciones cervicales realizadas con estos biomateriales. Métodos: El protocolo fue diseñado, y será reportado, en línea con Preferred Reporting Items for Systematic Reviews and Meta-Analyses Protocols (PRISMA-P 2015). Se realizará una búsqueda sensible en MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials y ClinicalTrials.gov, sin restricción por lenguaje o publicación, para identificar ensayos controlados aleatorizados que comparen dos o más tratamientos restauradores en lesiones cervicales no cariosas. Los desenlaces a evaluar serán la retención de las restauraciones y caries secundaria, según criterios RYGE/USPHS. Al menos dos investigadores realizarán de manera independiente la selección de los ensayos y la extracción de los datos. El riesgo de sesgo será evaluado utilizando la herramienta recomendada por la colaboración Cochrane. Si es posible, se realizará un metanálisis y los datos serán presentados en tablas de resúmenes de resultados mediante el método Grading of Recommendations Assesment, Development and Evaluation (GRADE). Fortalezas y debilidades: Esta revisión sistemática entregará evidencia actualizada sobre el comportamiento de cuatro biomateriales en el tratamiento de lesiones cervicales no cariosas. La principal limitación proviene de la baja cantidad o deficiencias metodológicas de los estudios primarios. Número de registro (PROSPERO): CRD42017071114.(AU)


Non-carious cervical lesions constitute a group of non-bacterial pathological conditions of the dental structure located at amelocementary junction. The main dental materials that have been described for the restorative treatment of these lesions are: ionomer glass, resin modified ionomer glass, compomers and composite resins. The objective of this protocol, is to establish the methodological elements of a systematic review, that will evaluate the clinical behavior of cervical restorations performed with four dental biomaterials. Methods: The protocol was designed, and will be reported, in line with Preferred Reporting Items for Systematic Reviews and Meta-Analyzes Protocols (PRISMA-P 2015). We will conduct a sensitive search in MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials and ClinicalTrials.gov, without language or publication restrictions, in order to identify randomized controlled trials comparing two or more restorative treatments in non-carious cervical lesions. The evaluated outcomes will be retention of restorations and secondary caries, according to RYGE/USPHS criteria. At least two reviewers will independently select studies and extract data. The risk of bias will be assessed using the tool recommended by the Cochrane Collaboration. If possible, a meta-analysis will be performed and the data will be presented in summary tables of results using the Grading of Recommendations Assesment, Development and Evaluation (GRADE) approach. Strength and Limitations: This systematic review will provide updated evidence on the behavior of four different dental biomaterials in the treatment of non-carious cervical lesions. The main limitation might arise from the low number or methodological limitations of primary studies. Register number (PROSPERO): CRD42017071114.(AU)


Assuntos
Humanos , Masculino , Feminino , Lesões do Pescoço , Vidro , Metanálise , Resinas Compostas , Compômeros
20.
Av. odontoestomatol ; 33(6): 263-274, nov.-dic. 2017.
Artigo em Espanhol | IBECS | ID: ibc-172651

RESUMO

En los últimos años, las resinas compuestas han sido mejoradas en cuanto al desgaste, estética y otras propiedades físicas. El mayor problema que persiste con las resinas compuestas es que estos materiales se contraen durante la polimerización. Contracción significa densificación o pérdida de volumen. En la cavidad dental, esta pérdida de volumen compromete la integridad de la interfase entre resina y diente, lo cual favorece la formación de grietas con el riesgo de hipersensibilidad, recidiva de caries o, incluso, fractura de la restauración. En el presente artículo, se expone la actualidad acerca del conocimiento sobre la contracción de polimerización de las resinas compuestas y su relación con el tipo de lámpara de polimerizar. Así mismo, se desarrollan los conceptos de fase obscura, expansión higroscópica, el consecuente estrés de contracción o los nuevos materiales que se presumen carentes de contracción; todo ello, en el marco de la dinámica lógica y normal llevada a cabo a la hora de realizar una obturación utilizando resinas compuestas con independencia de su relleno o partícula de éste. Respecto a las fuentes de polimerización, tanto las lámparas halógenas convencionales o las de alta densidad de potencia, como las LEDs, ofrecen un incremento gradual de la intensidad lumínica, lo que resulta muy útil para disminuir la contracción volumétrica del material


In recent years, composite resins have been improved in terms of wear, aesthetics and other physical properties. The major problem persists with composite resins is that these materials shrink during polymerization. Contraction means densification or loss of volume. In the dental cavity this loss of volume compromises the integrity of the interface between resin and tooth, which favors the formation of cracks with the risk of hypersensitivity, recurrence of caries or even fracture of the restoration. This article presents the current knowledge about the polymerization contraction knowledge of the composite resins and its relation to the type of polymerization lamp. Also the concepts of obscure phase, hygroscopic expansion, the consequent stress of contraction or the new materials that are presumed devoid of contraction are developed, all this in the frame of the logical and normal dynamics carried out at the time of making a seal using composite resins, regardless of their filler or particle thereof. Regarding the sources of polymerization, both conventional halogen lamps and high power density lamps, such as LEDs, offer a gradual increase in light intensity, which is very useful to decrease the volume shrinkage of the material


Assuntos
Humanos , Resinas Compostas/análise , Cura Luminosa de Adesivos Dentários/métodos , Polimerização , Molhabilidade , Análise do Estresse Dentário/métodos , Compômeros/análise , Restauração Dentária Permanente/efeitos adversos , Elasticidade
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