Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 3.034
Filtrar
1.
PLoS One ; 17(8): e0272387, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35913977

RESUMO

Titanium alloys have great potential in ultra-precision situations due to the excellent properties, such as high corrosion resistance, high specific-strength and high biocompatibility. However, the application of titanium alloys in ultra-precision field is limited by the poor machinability. There are difficulties in obtaining the optical surface. In this study, the possibility for obtaining optically graded surfaces of titanium alloys by ultra-precision polishing was investigated. Before the ultra-precision polishing, ultra-precision turning with a single point diamond tool was used to get all sample surfaces. But, titanium alloy is difficult to obtain good surface quality by ultra-precision diamond turning. The samples results confirmed that most of the surface roughness values are higher than 30 nm. In order to explore the polishing process, a large number of ultra-precision polishing experiments were conducted. In addition, the effects of different ultra-precision polishing parameters on the surface profiles of titanium alloy Ti6Al4V were investigated in depth. The results show that the average values of surface roughness of titanium alloy parts with ultra-precision turning can be further reduced by 70% or so by ultra-precision polishing. Using a reasonable combination of high spindle speed and large cutting depth, the value of surface roughness can even be lower than 2 nm.


Assuntos
Ligas , Titânio , Polimento Dentário , Diamante , Teste de Materiais , Propriedades de Superfície
2.
BMC Oral Health ; 22(1): 299, 2022 07 19.
Artigo em Inglês | MEDLINE | ID: mdl-35854282

RESUMO

BACKGROUND: With the application of surface sealant agents, smooth surfaces can be achieved in a shorter time when compared with conventional polishing. However, studies on the performance of these agents against chewing forces are not many. The purpose of this study was to evaluate the surface roughness and Streptococcus mutans adhesion on surface sealent coupled interim prosthetic materials after chewing simulation. METHODS: One hundred and twelve specimens were fabricated from two poly(methyl methacrylate) (Tab 2000, Dentalon Plus) and two bis-acryl (Tempofit, Protemp 4) interim crown materials and divided into 4 groups (n = 7) according to applied surface treatment: conventional polishing (control) and 3 surface sealant (Palaseal, Optiglaze, Biscover) coupling methods. The surface roughness values (Ra) were measured with a profilometer before (Ra0) and after aging through dynamic loading in a multifunctional chewing simulator for 10,000 cycles at 50 N load combined with integral thermocycling (between 5 and 55 °C) (Ra1). Specimens were incubated with Streptococcus mutans suspension and the total number of adherent bacteria was calculated by multiplying the counted bacterial colonies with the dilution coefficient. RESULTS: Surface sealant agent application significantly decreased the surface roughness compared with conventionally polished specimens, except for Optiglaze or BisCover LV applied Protemp 4 and Palaseal or Biscover LV applied Tempofit. Surface roughness after dynamic loading showed a statistically significant increase in all groups, except for the control groups of Tab 2000 and Protemp 4. A positive correlation was found between surface roughness values of interim prosthodontic materials and the quantitiy of Streptococcus Mutans. CONCLUSIONS: Even though surface sealant agent application significantly decreased the surface roughness compared with conventionally polished specimens, dynamic loading significantly increased the surface roughness of all surface sealant coupled materials. The Ra values of all test groups were higher than the plaque accumulation threshold (0.20 µm). Streptococcus mutans adhered more on rougher surfaces.


Assuntos
Polimento Dentário , Streptococcus mutans , Resinas Compostas , Coroas , Materiais Dentários , Polimento Dentário/métodos , Humanos , Teste de Materiais , Polimetil Metacrilato , Propriedades de Superfície
3.
PLoS One ; 17(7): e0270938, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35797310

RESUMO

The aim of this in-vitro study is to compare the prophylaxis powder Airflow® Plus to a conventional prophylaxis paste with regards to surface abrasion and roughness on four different restorative materials. A total of 80 samples were fabricated, including 20 of each investigated material. Among those were a nanocomposite (Ceram X Spectra™ ST, Dentsply), a glass ionomer cement (Ketac Fill™, 3M™), a cast metal alloy (Bio Maingold SG®, Heraeus Kulzer) and a ceramic (HeraCeram® Saphir, Heraeus Kulzer). Of each material, all samples were equally divided into two groups. Samples in one group were treated with AirFlow® Plus using the AirFlow® Prophylaxis Master (EMS, Switzerland) (Group AF) and the ones in the other group with Prophy Paste (Cleanic™, Kerr, Austria) (Group CL) on a rubber cup. Applied force amounted to 1.5 N at 2000 rpm. Under controlled reproduceable conditions, a 10-year interval with 4 application per year, a total of 200 seconds, was simulated. Size of each sample amounted to 6 mm in diameter and 2 mm in height. Half side of each sample were treated. While comparing the treated and untreated area of each sample, surface abrasion and roughness were measured using an optical 3D system. Roughness was measured based on the arithmetic roughness average of the surface (Ra) and root mean square of the surface roughness (Rq). The statistical evaluation of the data was carried out using the non-parametric Mann-Whitney-U-test, Wilcoxon-test and the Kruskal-Wallis test for group comparisons. In conclusion, the use of the rubber cup with Prophy Paste caused a significantly higher abrasion on composite, ceramic and gold compared to the AirFlow® Plus powder (p < 0.05). In group AF, the significant highest values for Ra were determined on GIC, followed by composite, gold and then ceramic in intragroup comparison. Ra on GIC was significantly higher in group AF (p < 0.05).


Assuntos
Eritritol , Borracha , Polimento Dentário , Ouro , Teste de Materiais , Pós , Propriedades de Superfície
4.
Oper Dent ; 47(3): E131-E151, 2022 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-35776960

RESUMO

PURPOSE: The current gold standard measure to assess polishing efficacy is surface roughness (SR) assessed in laboratory research. Specular gloss (SG) has been negatively correlated to SR, which raises the following question: Can SG be used to accurately determine the effectiveness of a finishing/polishing procedure in direct resin composites? METHODS: A systematic approach and search strategy, following Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) guidelines, was developed and conducted in five electronic databases: PubMed/Medline, Scopus, Web of Science, EMBASE (Ovid), and SciELO/LILACS to identify laboratory studies that assessed SR and SG, simultaneously, of resin composites, without date or language restriction. Risk of bias assessment was carried out by two reviewers, independently. From the extracted quantitative data of SG/SR, regression analyses were performed, and a linear mixed-effects prediction model was derived using the nimble package in R (v4.0.3). RESULTS: A total of 928 potential studies were found, out of which, 13 were eligible after criterion screening. Experimental groups featured 31 resin composites of six different filler types, with the most common being microhybrids followed by nanohybrids. More than half of the studies initially reported a linear correlation between SR and SG, which ranged from r2 = 0.34-0.96. Taking into account the regression analysis and prediction model posteriorly performed, the corresponding SG threshold for 0.2 µm is estimated to be >55 GU. Most of the evidence was classified as moderate or high risk of bias. CONCLUSION: SG is universally correlated to SR in polymers, and a reference value of >55 GU is proposed, above which samples are considered well polished.


Assuntos
Polimento Dentário , Polímeros , Resinas Compostas/uso terapêutico , Polimento Dentário/métodos , Teste de Materiais , Propriedades de Superfície
5.
Am J Dent ; 35(2): 141-145, 2022 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-35798709

RESUMO

PURPOSE: To evaluate the degree of stain absorption of resin composite following different finishing and polishing protocols and to evaluate the efficacy of prophylaxis paste with or without addition of carbamide peroxide to remove composite surface stain. METHODS: 50 resin composite blocks were prepared using nano-hybrid composite (Filtek Z250XT) and giomer (Beautifil II LS). Specimens were either polished with a disk or coated with 5th/7th generation bonding or glycerin gel. The color parameters (lightness, chroma and hue) of the specimens were measured prior to staining, and after 1 and 2 weeks of staining using a color chromometer. The composite surface stain removal capability of prophylaxis pastes with or without the addition of carbamide peroxide was evaluated before and after polishing. RESULTS: The repeated measures ANOVA showed that composite polished with a polishing disk or coated with glycerin gel have better color stability compared to composite without any polishing or coated with 5th or 7th generation bonding materials. The prophylaxis paste was able to remove composite surface stain; however, the addition of carbamide peroxide did not show any additional benefit. The results suggested that polishing with polishing disks or coating with glycerin gel is useful for the color stability of resin composite. CLINICAL SIGNIFICANCE: Selection of finishing and polishing protocols varies among individual practitioners. Each of these protocols has some pros and cons concerning the esthetic and color stability of composite. The present results suggested that the use of polishing disk or glycerin gel during polymerization would be a useful protocol to achieve and maintain esthetically stable composite restorations.


Assuntos
Corantes , Polimento Dentário , Peróxido de Carbamida , Cor , Resinas Compostas , Materiais Dentários , Polimento Dentário/métodos , Glicerol , Teste de Materiais , Propriedades de Superfície
6.
BMC Oral Health ; 22(1): 258, 2022 06 26.
Artigo em Inglês | MEDLINE | ID: mdl-35754035

RESUMO

BACKGROUND: It has been demonstrated that dental restorations with rough surfaces can have several disadvantages such as pigment retention or plaque accumulation, which can facilitate caries formation, color variation, loss of brightness, degradation of restoration, among others. The present study aimed to assess surface roughness in bulk fill and conventional nanohybrid resins with and without polishing, controlling the oxygen inhibited layer. METHODS: This in vitro and longitudinal experimental study consisted of 120 resin blocks of 6 mm diameter and 4 mm depth, divided into two groups: Bulk Fill (Tetric® N-Ceram Bulk-fill, Opus Bulk Fill APS, Filtek™ Bulk Fill) and conventional nanohybrid (Tetric® N-Ceram, Opallis EA2, Filtek™ Z250 XT). Each resin group was divided into two equal parts, placing glycerin only on one of them, in order to control the oxygen inhibited layer. Subsequently, the surface roughness was measured before and after the polishing procedure with Sof-Lex discs. The data were analyzed with the T-test for related measures, and for comparison between groups before and after polishing, the non-parametric Kruskal Wallis test with the Bonferroni post hoc was used, considering a significance level of p < 0.05. RESULTS: Before polishing, the resin composites with the lowest surface roughness were Opus Bulk Fill APS (0.383 ± 0.186 µm) and Opallis EA2 (0.430 ± 0. 177 µm) with and without oxygen inhibited layer control, respectively; while after polishing, those with the lowest surface roughness were Opus Bulk Fill APS (0.213 ± 0.214 µm) and Tetric N-Ceram (0.097 ± 0.099 µm), with and without oxygen inhibited layer control, respectively. Furthermore, before and after polishing, all resins significantly decreased their surface roughness (p < 0.05) except Opus Bulk Fill APS resin with oxygen inhibited layer control (p = 0.125). However, when comparing this decrease among all groups, no significant differences were observed (p < 0.05). CONCLUSION: The Opus Bulk Fill APS resin with oxygen inhibited layer control presented lower surface roughness both before and after polishing, being these values similar at both times. However, after polishing the other bulk fill and conventional nanohybrid resins with and without oxygen inhibited layer control, the surface roughness decreased significantly in all groups, being this decrease similar in all of them.


Assuntos
Polimento Dentário , Oxigênio , Resinas Compostas , Polimento Dentário/métodos , Humanos , Teste de Materiais , Propriedades de Superfície
7.
J Oral Sci ; 64(3): 247-250, 2022 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-35718466

RESUMO

PURPOSE: The influence of three dental abrasives on the surface roughness, glossiness, and color of titanium (Ti) after mechanical polishing was investigated. METHODS: The specimens were divided into groups, referred to as SM, SR, and TP, to distinguish the different polishing processes. SM: rubber polishing using a rubber point containing SiC abrasive particles at 20,000 rpm, followed by gloss polishing; SR: rubber polishing using a rubber point containing Al2O3 abrasive particles at 20,000 rpm, followed by gloss polishing; TP: rubber polishing using a rubber point containing TiO2 abrasive particles at 6,000 rpm, followed by gloss polishing. Gloss polishing was carried out at 10,000 rpm using a leather buffing wheel. Measurements to evaluate the surface conditions of Ti were performed after each polishing process. RESULTS: There were no significant differences in the Ra and glossiness values between the SM and TP groups; these specimens were not as smooth and glossy as the SR group. The SM group showed relatively high values of lightness and chroma after gloss polishing. CONCLUSION: Rubber polishing with abrasives containing SiC or TiO2 particles before gloss polishing did not achieve appropriate surface conditions on Ti.


Assuntos
Polimento Dentário , Titânio , Cor , Resinas Compostas , Teste de Materiais , Borracha , Propriedades de Superfície
8.
São Paulo; s.n; 20220601. 119 p.
Tese em Português | LILACS, BBO - Odontologia | ID: biblio-1370708

RESUMO

Objetivos: O estudo avaliou, para quatro diferentes zircônias monolíticas translúcidas, o efeito da microestrutura e do estado da superfície (glazeada versus polida após simulação de ajuste oclusal) nas seguintes respostas: (1) propriedades mecânicas (resistência a flexão biaxial, tenacidade à fratura e dureza Vickers; (2) molhamento de superfície a partir da verificação do ângulo de contato; (3) perda de volume e rugosidade superficial após ensaio de desgaste e (4) parâmetros de translucidez. Materiais e métodos: quatro diferentes blocos de zircônias translúcidas foram utilizadas nesse estudo; Prettau anterior, Lava Plus, Cercon hT e Cercon xT. Foram confeccionados 112 espécimes em formato de disco para cada material, tendo sido todos eles glazeados e parte dos espécimes foram ajustados superficialmente com o uso de pontas diamantadas (simulação de ajuste oclusal) e posteriormente polidos com o uso de ponta de borrachas (simulação de polimento clínico). Os espécimes utilizados nos ensaios de dureza Vickers e tenacidade à fratura foram polidos com o uso de lixas e soluções diamantadas em politriz semiautomática. Parte dos espécimes confeccionados sofreram o ensaio de desgaste. Anteriormente, foram levados a um perfilômetro óptico para determinação de seu perfil topográfico para a determinação da rugosidade e posterior avaliação da perda de volume. Em seguida, os discos foram submetidos ao ensaio de desgaste em uma simuladora da mastigação por meio milhão de ciclos com carga de 30 N e frequência de 2 Hz. Após o ensaio de desgaste, os espécimes foram submetidos novamente à análise topográfica através de perfilometria óptica para determinação da perda de volume e rugosidade superficial. Foram avaliadas também as propriedades mecânicas por meio dos ensaios de resistência a flexão biaxial, tenacidade a fratura e dureza Vickers, e a análise de molhamento de superfície por meio da mensuração do ângulo de contato e caracterização das propriedades de ópticas sobre os parâmetros de translucidez. Resultados: na resistência á flexão foi verificado o efeito do estado da superfície, na condição ajuste Cercon hT apresentou o maior valor e o Lava Plus o menor, para a condição glaze não foi encontrada diferença entre os valores de resistência os materiais testados; os valores médios de dureza foram semelhantes para os materiais testados; as médias de tenacidade à fratura foram significativamente diferentes Lava Plus apresentou o maior valor e o Cercon hT e Prettau o menor que foram semelhantes entre si; para os valores de ângulo de contato foram estatisticamente superiores na condição ajuste para todos os materiais; para os valores médios de rugosidade média foi verificado o efeito do ajuste e posterior polimento para o Cercon hT, após ensaio de desgaste foi verificado o aumento da rugosidade para todos os materiais independente da condição, os valores de Ra para a condição ajuste foi numericamente maior se comparada a condição glaze para todos os materiais, os valores médios de perda de volume após ensaio de desgaste foi significativamente maior para o Lava Plus na condição ajuste, para os demais materiais o estado as superfície não afetou significativamente a perda de volume, para os valores do parâmetro de translucidez os materiais Lava Plus e Prettau tiveram valores menores semelhantes e significativos aos valores de Cercon hT e xT que foram superiores e semelhante entre si, na condição ajuste os materiais Cercon hT e Cercon xT continuaram apresentando valores semelhantes e superiores a Prettau, o Lava Plus após ajuste apresentou valores semelhantes estatisticamente aos valores de PT dos materiais Cercon xT e hT o material Cercon hT apresentou maior valor de resistência após ajuste Conclusão: Houve efeito da microestrutura e do estado de superfície para a resistência à flexão, rugosidade média e para o parâmetro de translucidez; o efeito da microestrutura na tenacidade à fratura, e foi observado o efeito do estado de superfície para os valores do ângulo de contato e na perda de volume.


Assuntos
Polimento Dentário , Desgaste dos Dentes
9.
Dent Mater ; 38(5): e136-e146, 2022 05.
Artigo em Inglês | MEDLINE | ID: mdl-35430107

RESUMO

OBJECTIVES: Investigate the effect of aging on the wear behavior of glazed vs polished monolithic zirconia and to establish if glazing provides protection against low temperature degradation. METHODS: 40 1-mm-diameter spheres made from four differently treated monolithic zirconia (VITA YZ® HT); polished, polished-aged, glazed and glazed-aged (n = 10), were tested in a wear testing machine (UFW200) against bovine enamel in artificial saliva as per the following settings (ISO20808:2016): ball-on-disc configuration, 5 N vertical load, 0.1 m/s sliding speed, 400 m sliding distance and 37 °C temperature. Vertical substance loss (mm) wear of zirconia and enamel specimens was measured. Data were statistically analyzed with Kruskal-Wallis one-way ANOVA test (α > 0.05). RESULTS: Glazed-aged zirconia specimens resulted in the greatest amount of enamel wear (0.823 mm ± 0.157) followed by glazed (0.729 mm ± 0.289), polished-aged (0.377 mm ± 0.201) then polished (0.247 mm ± 0.125). In the groups with the same surface finish, aging showed no statistical difference in wear (P > 0.008). Glazing resulted in a higher enamel wear compared with polishing that was statistically significant (P < 0.008) except when the polished specimens were aged and the glazed specimens were not aged. SIGNIFICANCE: Aging increases abrasiveness of monolithic zirconia regardless of the type of surface finish. The effect of aging is "latent" and only revealed under mechanical loading during wear simulation which increases surface roughness and wear by adversely affecting zirconia's mechanical properties, making it less capable to maintain its initial surface smoothness. The glaze layer may protect zirconia from LTD, however, it is susceptible to aging which further increases its abrasiveness.


Assuntos
Polimento Dentário , Porcelana Dentária , Animais , Bovinos , Teste de Materiais , Propriedades de Superfície , Zircônio
10.
Oper Dent ; 47(2): 190-201, 2022 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-35405013

RESUMO

OBJECTIVES: This in situ study aimed to analyze the influence of different resin cement removal techniques on bacterial adhesion and biodegradation at the marginal interface of ceramic laminates. METHODS AND MATERIALS: Eighty feldspathic ceramic (F) blocks were prepared and cemented onto bovine enamel slabs (7×2.5×2 mm). Excess cement was removed using a microbrush (MBR), a scalpel blade (SCP), or a Teflon spatula (TSP). For the biodegradation analysis, 40 disc-shaped resin cement specimens were prepared (7×1.5 mm) using a Teflon mold. The specimens were randomly allocated into two groups: (1) No finishing procedure (only Mylar strip), and (2) with finishing and polishing procedures using the Jiffy system (Ultradent, South Jordan, UT, USA) (n=20). The in situ phase consisted of using an intraoral palatal device by 20 volunteers for 7 days. Each device contained five cylindrical wells (8×3 mm), where three dental blocks and two cement specimens were included in the wells. Surface roughness (Ra) was measured using a contact profilometer. A micromorphological analysis was performed under a stereomicroscope and a scanning electron microscope. Bacterial adhesion was quantitated based on the number of colony-forming units (CFU/mL) and their biofilm development potential. RESULTS: The cement removal techniques directly affected surface roughness at the marginal interface (p<0.001), and the SCP technique produced higher mean roughness, regardless of the surface area analyzed. Surface polishing protected cement specimens from further biodegradation (p=0.148). There were no differences in CFU counts between the groups after the in situ phase (p=0.96). All specimens showed CFU with a strong ability to develop a biofilm. CONCLUSIONS: The techniques used for cement removal increased the surface roughness of ceramic laminates, particularly SCP, but they did not affect bacterial adhesion at the marginal interface. Surface polishing of the resin cement is recommended to mitigate biodegradation.


Assuntos
Polimento Dentário , Cimentos de Resina , Animais , Aderência Bacteriana , Bovinos , Cerâmica , Resinas Compostas , Cimentos Dentários , Materiais Dentários , Polimento Dentário/métodos , Porcelana Dentária , Cimentos de Ionômeros de Vidro , Humanos , Teste de Materiais , Politetrafluoretileno , Propriedades de Superfície
11.
Clin Oral Investig ; 26(6): 4479-4486, 2022 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-35435492

RESUMO

OBJECTIVE: The aim of this study was to evaluate the effect of four different finishing procedures on the fatigue strength of a fully stabilized zirconia (5Y-FSZ) material. MATERIALS AND METHODS: Disc-shaped specimens of a 5Y-FSZ (Katana UTML, Kuraray Noritake) were made (ISO 6872-2015), grinded with 600- and 1200-grit silicon carbide paper, sintered as recommended, and randomly assigned into four groups according to the finishing technique: C (control, as-sintered), P (polished with polishing rubbers), G (glaze application - powder/liquid technique), and PG (polished with polishing rubbers + glaze application - powder/liquid). Then fatigue strength (staircase method), X-ray diffraction (XRD), and scanning electron microscopy (SEM) analyses were performed. RESULTS: The C group presented the lowest fatigue strength, while the PG group presented the highest. The P and G groups presented intermediate behavior, presenting similar statistical results. XRD showed similar crystalline phase patterns for all groups. SEM images revealed some changes in the zirconia surface, with the P group presenting some scratches on the surface, while the scratches in the PG group were filled with the glaze material. CONCLUSION: None of the techniques analyzed in this study impaired the fatigue strength of fully stabilized zirconia. Importantly, the polishing rubbers combined with glaze application (PG group) improved its fatigue strength. CLINICAL RELEVANCE: The polishing rubbers followed by glaze application improve the fatigue strength in ultra-translucent zirconia.


Assuntos
Teste de Materiais , Zircônio , Cerâmica/química , Polimento Dentário , Humanos , Microscopia Eletrônica de Varredura , Pós , Propriedades de Superfície , Zircônio/química
12.
Clin Oral Investig ; 26(7): 4761-4768, 2022 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-35292846

RESUMO

OBJECTIVE: To evaluate the effect of adjustment and finishing procedures and thermal aging of monolithic zirconia on the surface roughness, phase transformation, and flexural strength. MATERIAL AND METHODS: One hundred disk-shaped monolithic zirconia specimens were randomly divided into 5 groups: control, received only glazing; group Gr, was grinded; group GrP, was grinded and polished; group GrG, was grinded and re-glazed; group GrPG, was re-glazed after grinding and polishing. Half of the each group were stored in distilled water for 24 h and the remaining were thermocycled for 5000 cycles. Topographic evaluations were done with profilometer and scanning electron microscope. Phase changes were assessed through X-ray diffractometer. The biaxial flexural strength test was calculated by universal test machine. Statistical analysis was performed by using two-way ANOVA and Tukey multiple comparison test (p < 0.05). RESULTS: Group Gr showed statistically higher surface roughness and flexural strength values than the other groups (p < 0.001). However, no significant differences were observed between finishing groups (p >0.05). Phase transformation was occurred in all groups but the differences were not statically significant (p >0.05). Artificial aging had no effect on surface roughness, flexural strength, and phase transformation (p >0.05). CONCLUSION: Surface roughness significantly increased after grinding, but finishing procedure approximated it to the control group. Glazing after grinding decreased the flexural strength, but polishing did not. Zirconia polishing system may be an alternative to re-glazing for monolithic zirconia. CLINICAL RELEVANCE: Polishing is one of the most effective finishing procedures that can improve the physical properties of the material without damaging its mechanical properties.


Assuntos
Polimento Dentário , Zircônio , Cerâmica , Polimento Dentário/métodos , Teste de Materiais , Propriedades de Superfície
13.
BMC Oral Health ; 22(1): 70, 2022 03 13.
Artigo em Inglês | MEDLINE | ID: mdl-35282825

RESUMO

BACKGROUND: This study investigated clinical parameters using a new air-polishing device compared to sonic scaling for subgingival biofilm removal during supportive periodontal therapy. The aim was to evaluate noninferiority of air-polishing compared to sonic scaling in deeper periodontal pockets with respect to pocket depth (PD). METHODS: In 44 participants, 2 single-rooted teeth [(PD) ≥ 5 mm] were treated using a split-mouth design. While a new air polishing device with a conical shaped tip was used for the experimental group, sonic scaling was performed in the control group. PD, clinical attachment level (CAL), and bleeding on probing (BOP) were recorded at baseline, (T0) after 3 months (T1) and 6 months (T2). Pain perception was rated using a visual analog scale (VAS; 0 = no pain, 100 = maximum pain). RESULTS: PD and CAL decreased significantly for both groups, while no intergroup differences were found (PD [mean, mm] control T0 5.96, T2 4.75; experimental T0 5.96, T2 4.8; intergroup p = 0.998; CAL [mean, mm] control T0 7.38, T2 5.84; experimental T0 7.28, T2 6.34; intergroup p = 0.368). For BOP, no intergroup differences were found from T0 to T2 (reduction control 42.5%; experimental 46.5% p = 0.398). Pain perception was significantly lower for air polishing (VAS [mean, mm] control 28.8, experimental 12.56; p = 0.006). CONCLUSION: None of the two treatment procedures showed inferior clinical effects with regard to PD, CAL and BOP with air polishing being more comfortable to patients. Trial registration The study was registered in an international trial register on August 14/08/2019, before the start of recruitment (German Clinical Trial Register number DRKS00017844).


Assuntos
Polimento Dentário , Trealose , Polimento Dentário/métodos , Raspagem Dentária/métodos , Humanos , Bolsa Periodontal/tratamento farmacológico , Pós/uso terapêutico , Trealose/uso terapêutico
14.
J Clin Pediatr Dent ; 46(1): 24-29, 2022 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-35311974

RESUMO

OBJECTIVE: The aim of this study was to evaluate the effect of finishing and polishing procedures of compomer and bulk-fill composite resins on cytotoxicity against human gingival fibroblasts by xCELLigence analysis. STUDY DESIGN: Filtek™ Bulk Fill composite and Dyract XP compomer were used. After curing, the specimens were randomly divided into two groups and finishing-polishing procedures were applied to one group; no finishing-polishing procedures were applied to the other group. For the first time in this study, pure gold samples were prepared with the same weight and base area as the test specimens and the wells containing the pure gold samples were determined as the control group. xCELLigence system was used to assess the response of the human gingival fibroblasts after exposure to test specimens. Measurements were recorded for 72 hours after adding specimens. RESULTS: Finishing and polishing procedures caused a significant increase in cell viability of Dyract XP compomer samples at all time periods; the percentage of cell viability reached above 70% after finishing and polishing procedures. However, significant effects were not observed in Filtek™ Bulk Fill composite samples at any time period. CONCLUSION: Finishing and polishing procedures play an essential role in increasing the biocompatibility of Dyract XP compomer. It is recommended to apply finishing and polishing procedures even though a smooth surface may be obtained in restorations with matrix strips.


Assuntos
Materiais Dentários , Polimento Dentário , Resinas Compostas/toxicidade , Materiais Dentários/toxicidade , Polimento Dentário/métodos , Humanos , Propriedades de Superfície
15.
Am J Dent ; 35(1): 37-42, 2022 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-35316591

RESUMO

PURPOSE: To evaluate the effect of polishing systems (discs or rubbers) on surface roughness (Ra) and color change (ΔE) of two bulk fill and one conventional resin composite after immersion in a dye solution. METHODS: 180 samples (10 mm x 2 mm) were separated into three groups: (1) Resin composite: Filtek One Bulk Fill (FO), Tetric N-Ceram Bulk Fill (TNC), Filtek Z350 XT (FXT) (n= 60); (2) polishing system: unpolished (control); aluminum oxide discs (Sof-Lex, AOD); cup-shaped abrasive rubber polishers (Astropol, CSA) (n= 20), and (3) immersion solutions: coffee or distilled water (n= 10). Immersion was under 5 mL of each solution for 3 hours daily, for 30 days. Measurement of Ra and ∆E was made considering two times: initial (after polishing) and final (after immersion), in addition to surface analysis by scanning electron microscopy at the end. Kruskal-Wallis, Mann-Whitney, and Dunn (α= 0.05) was used. RESULTS: For the unpolished samples after immersion in coffee, TNC (P= 0.007) showed lower ΔE than FXT and FO. For polished samples with CSA and immersed in coffee, TNC followed by FXT showed lower ΔE than in the absence of polishing. Polishing with AOD and immersed in coffee: FO had smaller ΔE than when not polished. For Ra, TNC and FO had lower values after using AOD, whereas for FXT lower Ra was noted with CSA. CLINICAL SIGNIFICANCE: The roughness and color stability of resin composites are mediated by the polished material, polishing system and dye solution. The best results were found for Tetric N-Ceram polished with aluminum oxide discs.


Assuntos
Óxido de Alumínio , Polimento Dentário , Polimento Dentário/métodos , Teste de Materiais , Coloração e Rotulagem , Propriedades de Superfície
16.
BMC Oral Health ; 22(1): 85, 2022 03 23.
Artigo em Inglês | MEDLINE | ID: mdl-35321688

RESUMO

BACKGROUND: Supportive periodontal therapy (SPT) is the key for a stable periodontal health following active treatment. Likewise, implant maintenance is crucial following implant placement. This systematic review aimed to assess clinical outcomes, patients' perception, and cost-effectiveness of repeated periodontal therapy with air polishing devices (APDs) in comparison with hand instruments and/or power-driven instruments (conventional interventions) in SPT and implant maintenance. METHODS: Electronic search for randomised controlled clinical trials with minimum 6 months follow-up for SPT and implant maintenance programme was conducted for data published from 01 January 2000 to 30 April 2020 using multiple databases and hand searching. Risk of bias was assessed using the Revised Cochrane Risk-of-Bias tool (RoB 2). RESULTS: A total of 823 articles were screened. 4 SPT and 2 implant maintenance studies were eligible for inclusion. For SPT, repeated APDs interventions revealed no statistically significant difference when compared to the conventional interventions (weighted mean difference [WMD] 0.11 mm, p = 0.08). Likewise, no statistical difference was noted in terms of percentage of bleeding on probing (BOP) and clinical attachment level (CAL) gain. APDs were associated with lower pain score (based on Visual Analogue Scale) and higher patient acceptance in SPT studies. For implant maintenance, APDs resulted in reduction in PPD and percentage of BOP. However, CAL gain was comparable between the two groups. In terms of patient reported outcomes, no implant maintenance studies recorded any forms of patient reported outcomes. In addition, no studies reported on economic evaluation of APDs in both SPT and implant maintenance. CONCLUSION: Within the limitations of this systematic review and meta-analysis, repeated subgingival debridement using APDs in SPT resulted in similar clinical outcomes but better patients' comfort when compared to the conventional interventions. For implant maintenance, there is limited evidence to show that repeated application of APDs leads to improved clinical outcomes when compared to conventional treatments.


Assuntos
Implantes Dentários , Polimento Dentário , Polimento Dentário/métodos , Raspagem Dentária , Humanos
17.
Clin Implant Dent Relat Res ; 24(2): 242-250, 2022 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-35324063

RESUMO

AIM: The current in vitro model aims to evaluate the adjunctive effect on artificial biofilm removal determined by the use of a glycine-powder air-polishing procedure (GPAP) over the ultrasonic debridement (USD) alone when the removal of artificial biofilm on abutment surface is performed. The procedures were carried out also evaluating the impact of the site (mesial, distal, vestibular, and oral) and three different mucosal tunnel depths (2 mm, 4 mm, and 6 mm). MATERIALS AND METHODS: Single tooth implant replacement was simulated. Three different abutment heights together with a prosthetic contour were investigated (2 mm, 4 mm, and 6 mm); custom-made gingival masks were created to mimic peri-implant soft tissue. Biofilm was simulated with an indelible ink. The protocol consisted in two intervention stages for each abutment: (a) USD with PEEK tip plus (b) GPAP. At the end of each intervention, abutments were unscrewed, and standardized photographs were taken. Statistical analysis was carried out to compare residual stain percentage between the two intervention stages and among different sites and mucosal tunnels. RESULTS: A total of 30 abutments were instrumented. A significant reduction of the percentage of residual staining (PRS) after the combination of GPAP + USD over USD alone was demonstrated (16% vs. 32%; p < 0.05). Moreover, the better performance of the GPAP + USD protocol was observed regardless of the different mucosal tunnel heights and the sites analyzed. Intragroup analysis unveils that the smaller PRS was observed for shallow mucosal tunnels (2 mm) and vestibular sites for both protocols. CONCLUSION: GPAP + USD provided adjunctive effect on artificial biofilm removal in comparison to the USD alone. Furthermore, proximal surfaces and deeper mucosal tunnels (4 and 6 mm) showed a reduced instrumentation efficacy for both protocols.


Assuntos
Implantes Dentários , Mucosite , Peri-Implantite , Biofilmes , Desbridamento , Polimento Dentário , Glicina , Humanos , Peri-Implantite/terapia , Pós , Tecnologia , Ultrassom
18.
J Esthet Restor Dent ; 34(1): 15-41, 2022 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-35088935

RESUMO

OBJECTIVE: To describe the effect of the composites' composition to produce high surface smoothness/gloss using finishers/polishers, and to assess maintained smoothness/gloss under toothbrush abrasion. MATERIALS AND METHODS: PubMed papers published from January 01, 2000 to September 01, 2021 were included, and keywords used were: filler particle size, shape, amount of dental composites; finishing/polishing, gloss/roughness, and toothbrush abrasion of composites. Seventy-five in-vitro studies were included in this literature review. Forty-six articles assessed filler particle size/composition/shape and distribution to obtain high gloss/smoothness on different formulations; and the finishers/polishers effect on these materials. Twenty-nine papers assessed toothbrush abrasion of composites. RESULTS: Suprananofill/nanofill/microfills typically showed the smoothest and glossiest surfaces compared to nanohybrid, microhybrid and hybrid composites. Microfill (0.04-0.07 µm, 71-88 GU); suprananofill (0.001-0.8 µm, 52-92 GU), microhybrids (0.05-0.35 µm, 35-95 GU) and nanohybrids (0.05-0.21 µm, 66-97 GU). Composites with small, spherical particles tend to show smoother, glossier surfaces and more wear resistant compared to resin composites with larger or irregular particles. Several studies showed higher roughness and reduced gloss after toothbrush abrasion. CONCLUSIONS: Within the limitations of this study, suprananofill/nanofill/microfill composites tended to show the smoothest/glossiest surfaces due to smaller particle size. Composites with small, spherical particles tended to show smoother/glossier surfaces. Overall, toothbrush abrasion showed higher surface roughness and reduced gloss. CLINICAL SIGNIFICANCE: Suprananofills/nanofills/microfills had good polishability and polish retention due to their smaller particle size. The effectiveness of a polishing system is material-dependent. In general, Enhance-PoGo, Sof-Lex discs, and Sof-Lex Spiral wheels showed similar level of smoothness.


Assuntos
Resinas Compostas , Polimento Dentário , Teste de Materiais , Polônia , Propriedades de Superfície
19.
Clin Oral Investig ; 26(2): 1569-1578, 2022 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-34405311

RESUMO

OBJECTIVES: Air-polishing has been used in the treatment of periodontitis and gingivitis for years. The introduction of low-abrasive powders has enabled the use of air-polishing devices for subgingival therapy. Within the last decade, a wide range of different low-abrasive powders for subgingival use has been established. In this study, the effects of a glycine powder and a trehalose powder on human gingival fibroblasts (HGF) were investigated. METHODS: HGF were derived from three systemically and periodontally healthy donors. After 24 h and 48 h of incubation time, mRNA levels, and after 48 h, protein levels of TNFα, IL-8, CCL2, and VEGF were determined. In addition, NF-κB p65 nuclear translocation and in vitro wound healing were assessed. Statistical analysis was performed by ANOVA and post hoc Dunnett's and Tukey's tests (p < 0.05). RESULTS: Glycine powder significantly increased the expression of proinflammatory genes and showed exploitation of the NF-κB pathway, albeit trehalose powder hardly interfered with cell function and did not trigger the NF-κB pathway. In contrast to trehalose, glycine showed a significant inhibitory effect on the in vitro wound healing rate. CONCLUSION: Subgingivally applicable powders for air-polishing devices can regulate cell viability and proliferation as well as cytokine expression. Our in vitro study suggests that the above powders may influence HGF via direct cell effects. Trehalose appears to be relatively inert compared to glycine powder. CLINICAL RELEVANCE: With the limitations of an in vitro design, our study suggests that in terms of cell response, trehalose-based air-polishing powders show a reduced effect on inflammation.


Assuntos
Glicina , Trealose , Polimento Dentário , Fibroblastos , Gengiva , Glicina/farmacologia , Humanos , Pós , Trealose/farmacologia
20.
Clin Oral Implants Res ; 33(2): 184-196, 2022 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-34808006

RESUMO

OBJECTIVES: To compare erythritol air polishing with implant surface cleansing using saline during the surgical treatment of peri-implantitis. MATERIAL AND METHODS: During a resective surgical intervention, implant surfaces were randomly treated with either air polishing (test group n = 26 patients/53 implants) or saline-soaked cotton gauzes (control group n = 31 patients/ 40 implants). Primary outcome was change in mean bleeding on probing (BoP) from baseline to 12 months follow-up. Secondary outcomes were changes in mean suppuration on probing (SoP), plaque score (Plq), probing pocket depth (PPD), marginal bone loss (MBL), periodontal full-mouth scores (PFMS), and levels of 8 classical periodontal pathogens. Clinical and radiographical parameters were analyzed using multilevel regression analyses. Microbiological outcomes were analyzed using the Mann-Whitney U test. RESULTS: No differences between the test and control group were found for BoP over 12 months of follow-up, nor for the secondary parameters Plq, PPD, and MBL. Between both groups, a significant difference was found for the levels of SoP (p = 0.035). No significant effect on microbiological levels was found. A total number of 6 implants were lost in the test group and 10 in the control group. At 1-year follow-up, a successful treatment outcome (PPD<5 mm, max 1 out of 6 sites BoP, no suppuration and no progressive bone loss >0.5 mm) was achieved for a total of 18 implants (19.2%). CONCLUSIONS: Erythritol air polishing as implant surface cleansing method was not more effective than saline during resective surgical treatment of peri-implantitis in terms of clinical, radiographical, and microbiological parameters. Both therapies resulted in low treatment success. TRIAL REGISTRY: https://www.trialregister.nl/ Identifier: NL8621.


Assuntos
Implantes Dentários , Peri-Implantite , Polimento Dentário , Eritritol , Humanos , Peri-Implantite/cirurgia , Índice Periodontal , Resultado do Tratamento
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...