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1.
Niger J Clin Pract ; 23(1): 110-115, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31929216

RESUMO

Objective: The aim of this study was to compare to effect of phototherapy and surface flattening after immediately bleaching on the shear bond strength to bleached enamel. Methods: Ninety-six human upper incisors were divided into 4 groups (n = 24). Group NB: no bleached, group P: phototherapy with YSGG laser, group F: 0.5 mm surface flattening, group PF: 0.5 mm surface flattening and phototherapy with Er;Cr:YSGG laser. Then, each group was assigned to 2 subgroups according to adhesive mode (n = 12) as; subgroup S (self-etching mode), subgroup T (total-etching mode) which are universal adhesives. All surface conditionings and restorations were performed with composite resin materials immediately after bleaching. Shear bond strength test was performed by using universal testing machine. The surfaces were also evaluated with SEM. The data were statistically analyzed with one-way ANOVA post-hoc Tukey tests. Results: The lowest SBS values were achieved in FS (13.72 ± 2.29) while the highest ones in PT (28.01 ± 6.81). However, the differences were not significant (P > 0.05). All surface conditioning methods provided SBS values similar to the control (P > 0.05). All subgroups of self-etching mode were significantly lower than their total-etching counterparts (P < 0.05). Conclusions: The present study showed that surface removal and phototherapy have a potential clinical application for eliminate to undesirable effect of bleaching treatment. Surface conditioning with either flattening and/or phototherapy may provide clinicians to restore bleached teeth at the same visit with bleaching and reduce chair-time.


Assuntos
Adesivos/farmacologia , Colagem Dentária/métodos , Esmalte Dentário/efeitos dos fármacos , Corrosão Dentária/métodos , Lasers de Estado Sólido/uso terapêutico , Fototerapia , Resistência ao Cisalhamento , Clareamento Dental , Condicionamento Ácido do Dente/métodos , Resinas Compostas/química , Materiais Dentários/química , Humanos , Teste de Materiais , Clareamento Dental/métodos
2.
Braz Oral Res ; 33: e098, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31664361

RESUMO

The aim was to evaluate the effect of 2% grape seed extract (GSE) containing phosphoric acid (PhA) on the bond strength to enamel and dentin. The control group was 37% PhA. The following three PhA formulations with 2% GSE and 20% ethanol were obtained: GSE5 = 5% PhA; GSE10 = 10% PhA; and GSE20 = 20% PhA. The enamel and dentin surfaces of molars were etched with the acid solutions, followed by Scotchbond Multi-Purpose adhesive and composite resin application. The tensile bond strength (TBS) test evaluated the bond to enamel after 24 h, and the microtensile bond strength (µTBS) test evaluated the bond to dentin after 24 h and 12-month water storage. Etched enamel and dentin were observed by scanning electron microscopy (SEM) and atomic force microscopy (AFM), respectively. The TBS data were submitted to one-way ANOVA, while µTBS data were submitted to two-way ANOVA and Tukey's test (α = 0.05). The TBS (MPa) to enamel did not significantly differ among the control (48.1 ± 15.7), GSE5 (46.1 ± 9.6), GSE10 (49.8 ± 13.6) and GSE20 (44.1 ± 11.9) groups (p = 0.537). The µTBS (MPa) to dentin of the control (28.4 ± 14.4) and GSE20 (24.1 ± 8.1) groups were significantly higher than those of the GSE5 (16.8 ± 7.4) and GSE10 (17.5 ± 6.6) groups at 24 h (p < 0.006). After 12-month storage, only GSE5 (21.0 ± 7.8) and GSE10 (17.6 ± 8.0) did not show significantly decreased µTBS (p > 0.145). SEM micrographs showed a shallower enamel etching pattern for GSE5. AFM images showed the formation of collagenous globular structures for GSE5 and GSE10. The different acid solutions did not influence the TBS to enamel, and the µTBS to dentin was stable over time when dentin was etched with GSE5 and GSE10.


Assuntos
Condicionamento Ácido do Dente/métodos , Colagem Dentária/métodos , Esmalte Dentário/efeitos dos fármacos , Dentina/efeitos dos fármacos , Extrato de Sementes de Uva/química , Ácidos Fosfóricos/química , Adolescente , Adulto , Análise de Variância , Esmalte Dentário/química , Dentina/química , Humanos , Teste de Materiais , Microscopia de Força Atômica , Microscopia Eletrônica de Varredura , Valores de Referência , Reprodutibilidade dos Testes , Estatísticas não Paramétricas , Propriedades de Superfície/efeitos dos fármacos , Resistência à Tração , Fatores de Tempo , Adulto Jovem
3.
Acta Odontol Latinoam ; 32(1): 29-35, 2019 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-31206572

RESUMO

The aim of this study was to evaluate the deproteinization of primary enamel by analyzing etching pattern types, with and without the application of 5% NaOCl before acid etching with 37% H3PO4. Fifteen extracted human primary molars were randomly selected for the present in vitro study; 1mm x 1mm blocks were prepared and divided into two groups (n = 21). These groups were treated as follows: Group A- Acid Etching with 37% H3PO4 gel for 15 s; Group B- 5% NaOCl for 60 s + Acid Etching with 37% H3POfor 15 s. The specimens were prepared for scanning electron microscopy analysis. The images were evaluated for quality types I and II etching of the enamel surface using ImageJ software. Datasets were checked for normality by Kolgomorv-Smirnov test and the nonparametric unpaired Mann-Whitney test was applied. The mean surface area of type I and II etching pattern values was 1922.314 µm2for Group A and 3840.473 µm2Group B. We conclude that deproteinization with 5% NaOCl prior to acid etching can be used to increase the area of adhesion and the quality of the etching pattern.


Assuntos
Condicionamento Ácido do Dente/métodos , Colagem Dentária , Proteínas do Esmalte Dentário/efeitos dos fármacos , Esmalte Dentário/efeitos dos fármacos , Materiais Dentários/farmacologia , Ácidos Fosfóricos/farmacologia , Hipoclorito de Sódio/farmacologia , Dente Decíduo/efeitos dos fármacos , Colagem Dentária/métodos , Esmalte Dentário/ultraestrutura , Proteínas do Esmalte Dentário/ultraestrutura , Corrosão Dentária , Humanos , Microscopia Eletrônica de Varredura , Desnaturação Proteica , Cimentos de Resina , Propriedades de Superfície , Dente Decíduo/ultraestrutura
4.
Biomed Res Int ; 2019: 5070383, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31032348

RESUMO

This research evaluated the effects of subpressure on the shear bond strength (SBS) of 80 specimens with flat enamel surfaces and on AgNO3 microleakage of 40 specimens with flat enamel surfaces and 40 specimens with 1 mm deep cavities before and after thermocycling. The enamel of 168 specimens was grounded to a flat surface. Two types of sealants (E and H) were selected. Sealants were applied to enamel surface (88 specimens, group F) either subjected or not to subpressure. The bonding interfaces were observed using scanning electron microscopy (SEM) and the SBS was examined using a universal testing machine before and after thermocycling. The failure mode was also analyzed. For the microleakage test, 80 specimens were grouped as group A (original enamel flat surface) and group B (a round cavity of 1 mm in depth) (40 per group). Sealants were applied to the teeth either subjected or not to subpressure. The specimens were submitted to a microleakage protocol with AgNO3 and analyzed before and after thermocycling. Statistical analysis was performed for the data. The results showed that subpressure eliminated voids on the interface between the enamel and sealants and significantly enhanced specimens' SBS. Although thermocycling reduced SBS significantly, specimens under subpressure after thermocycling still showed higher SBS than specimens under nonsubpressure before thermocycling. The subpressure groups showed a lower microleakage level compared to nonsubpressure groups, though thermocycling caused deeper silver infiltration. In addition, different sealants showed no significant effect on the SBS and microleakage performance. Overall, subpressure application improves sealant bonding and retention rate and has potential to prevent secondary caries.


Assuntos
Cárie Dentária/prevenção & controle , Cárie Dentária/terapia , Esmalte Dentário/efeitos dos fármacos , Selantes de Fossas e Fissuras/uso terapêutico , Condicionamento Ácido do Dente/métodos , Colagem Dentária/métodos , Cárie Dentária/patologia , Esmalte Dentário/fisiopatologia , Análise do Estresse Dentário , Humanos , Teste de Materiais , Microscopia Eletrônica de Varredura , Dente Molar/efeitos dos fármacos , Selantes de Fossas e Fissuras/química , Cimentos de Resina/química , Cimentos de Resina/uso terapêutico , Resistência ao Cisalhamento , Propriedades de Superfície
5.
Niger J Clin Pract ; 22(3): 335-341, 2019 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-30837420

RESUMO

Aims: To evaluate the effect of different surface treatments and ceramic primers on the shear bond strength (SBS) of self-adhesive resin cement to zirconia ceramic. Materials and Methods: A total of 40 zirconia discs (10 mm in diameter and 3 mm in height; StarCeram Z-Med, H.C. Starck, Selb, Germany) were prepared from pre-sintered zirconia blocks. Discs were divided into two groups according to surface treatment: (a) airborne particle abrasion (sandblasting) with 50-µm Al2O3 particles and (b) 9.5% hydrofluoric acid etching. Each of these groups was subdivided into two groups according to the type of primer applied: (a) Z-Prime Plus primer and (b) Clearfil Ceramic Primer. A self-adhesive resin cement (Multilink Speed, Ivoclar Vivadent, Schaan, Liechtenstein) was used to bond with polyethylene molds. All specimens were tested at thermocycled (5000 cycles at 5-55°C for 30 s) conditions. The SBS of the luting cement to the ceramic was measured in a universal testing machine (1 mm/min). Results: The sandblasted groups showed significantly higher SBS values than the acid-etched groups for both primers (P = 0.0001). Independent of the surface treatment, the Z-Prime Plus primer groups showed higher SBS values than the Clearfil Ceramic Primer groups (P = 0.0001). Conclusions: Sandblasting is a more effective method to increase bond strength on zirconia ceramics than hydrofluoric acid etching, and the application of Z-Prime Plus primer increases SBS better than Clearfil Ceramic Primer.


Assuntos
Condicionamento Ácido do Dente , Adesivos , Cerâmica/química , Metacrilatos , Cimentos de Resina/química , Resistência ao Cisalhamento , Zircônio/química , Condicionamento Ácido do Dente/métodos , Colagem Dentária , Cimentos Dentários , Análise do Estresse Dentário , Humanos , Teste de Materiais , Propriedades de Superfície
6.
J Prosthodont Res ; 63(2): 145-149, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30528398

RESUMO

PURPOSE: The aim of this study was to evaluate the shear bond strength and durability of MMA-TBB resin to human enamel applied a self-etching primer with phosphoric acid etching. METHODS: A self-etching primer (Teeth primer, TP) containing 4-methacryloyloxyethyl trimellitate anhydride (4-META) and sodium sulfite and two etchants having different phosphoric acid concentrations (K-etchant gel, KE, 35-45%: Red gel, RG, 20-25%) were used as treatment agent, and MMA-TBB resin was used as luting agent. Enamel surfaces were treated with six methods which were as follow: KE, RG, TP, KE+TP, and RG+TP. After enamel specimens were bonded with MMA-TBB resin and stored in distilled water for 24h, the shear bond strength test was done at 0 thermocycling or 20,000 thermocycling. These results were statistically verified with Steel-Dwass multiple comparisons and Man-Whitney U test. RESULTS: The shear bond strength of TP group, KE+TP group, and RG+TP group were significantly higher than KE group and RG group in pre-thermocycling. KE+TP group and RG+TP group were significantly higher than other groups in post-thermocycling. CONCLUSIONS: Applying TP with phosphoric acid etching can increased shear bond durability despite difference of phosphoric acid concentrations (35-45% or 20-25%).


Assuntos
Condicionamento Ácido do Dente/métodos , Compostos de Boro , Colagem Dentária , Cimentos Dentários , Esmalte Dentário , Teste de Materiais , Metacrilatos , Metilmetacrilatos , Resinas Sintéticas , Resistência ao Cisalhamento , Sulfitos , Relação Dose-Resposta a Droga , Humanos , Ácidos Fosfóricos
7.
Eur Arch Paediatr Dent ; 20(1): 15-22, 2019 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-30328065

RESUMO

AIM: To determine the influence of two all-in-one self-etching adhesive systems on shear bond strength of a fissure sealant applied under different enamel surface conditions. METHODS: A total of 180 bovine enamel specimens were randomly distributed to nine experimental groups, defined by the combination of the sealant application technique (using phosphoric acid, or a self-etching water-based adhesive or a self-etching ethanol and water-based adhesive) and enamel surface conditions (dry enamel, saliva or water contaminated enamel). The specimens were submitted to thermocycling prior to the shear bond strength test. RESULTS: High shear bond strength mean values were obtained with the classic technique for dry enamel (31.47 MPa), statistically similar values were obtained when the sealant was combined with a self-etching water-based adhesive, in dry enamel (32.36 MPa), and when the sealant was combined with a self-etching water-based adhesive in water contaminated enamel (32.62 MPa). Under enamel salivary contamination, the best results were achieved using a water-based adhesive (24.78 MPa). CONCLUSIONS: In saliva contaminated enamel, the combination of a sealant with a water-based self-etching adhesive can maintain high and satisfactory values of bond strength.


Assuntos
Condicionamento Ácido do Dente/métodos , Bis-Fenol A-Glicidil Metacrilato , Organofosfatos , Selantes de Fossas e Fissuras , Saliva , Resistência ao Cisalhamento , Animais , Bovinos , Cimentos Dentários , Esmalte Dentário/química , Análise do Estresse Dentário , Adesivos Dentinários , Ácidos Fosfóricos , Distribuição Aleatória , Falha de Tratamento
8.
Eur J Oral Sci ; 127(2): 162-169, 2019 04.
Artigo em Inglês | MEDLINE | ID: mdl-30536451

RESUMO

The purpose of this study was to evaluate whether surface wetness would influence the bonding effectiveness of universal adhesives in etch-and-rinse mode. All-Bond Universal (AB), G-Premio Bond (GP), Prime & Bond Active (PB), and Scotchbond Universal Adhesive (SU) were evaluated. Initial bond strengths and bond-fatigue strengths of universal adhesives to both wet and dry enamel and dentin in etch-and-rinse mode were determined. Scanning electron microscopy observations of the adhesive interfaces were also conducted. The bond-fatigue durability of universal adhesive to enamel in etch-and-rinse mode was influenced by the surface wetness, unlike that to dentin. The bond fatigue durability of AB and GP to dentin in etch-and-rinse mode was different depending on the surface wetness, unlike that of PB and SU. The thicknesses of the adhesive or hybrid layer of resin-dentin interfaces were not influenced by the surface wetness, but the length of resin tags in the wet group was longer than in the dry group. Some universal adhesives with the addition of specific components and optimization of water content can achieve stable bonds regardless of surface wetness, but the surface wetness of dentin is still a significant factor for universal adhesive bonding in etch-and rinse mode, unlike that of enamel.


Assuntos
Condicionamento Ácido do Dente/métodos , Adesivos/química , Colagem Dentária/métodos , Materiais Dentários/química , Adesivos Dentinários/química , Dentina , Propriedades de Superfície , Cimentos Dentários , Humanos , Teste de Materiais , Microscopia Eletrônica de Varredura , Cimentos de Resina/química
9.
Acta odontol. latinoam ; 32(1): 29-35, 2019. ilus, tab, graf
Artigo em Inglês | LILACS | ID: biblio-1010419

RESUMO

The aim of this study was to evaluate the deproteinization of primary enamel by analyzing etching pattern types, with and without the application of 5% NaOCl before acid etching with 37% H3PO4. Fifteen extracted human primary molars were randomly selected for the present in vitro study; 1mm x 1mm blocks were prepared and divided into two groups (n = 21). These groups were treated as follows: Group AAcid Etching with 37% H3PO4 gel for 15 s; Group B5% NaOCl for 60 s + Acid Etching with 37% H3PO4for 15 s. The specimens were prepared for scanning electron microscopy analysis. The images were evaluated for quality types I and II etching of the enamel surface using ImageJ software. Datasets were checked for normality by KolgomorvSmirnov test and the nonparametric unpaired MannWhitney test was applied. The mean surface area of type I and II etching pattern values was 1922.314 µm2for Group A and 3840.473 µm2Group B. We conclude that deproteinization with 5% NaOCl prior to acid etching can be used to increase the area of adhesion and the quality of the etching pattern (AU)


El objetivo del estudio fue evaluar la desproteinización del esmalte primario a través de los tipos de patrones de grabado, con y sin NaOCl 5% utilizado antes del grabado ácido con H3PO4 37%. Quince dientes primarios humanos extraídos se seleccionaron al azar para el presente estudio in vitro, se prepararon bloques de 1mm x 1 mm y se dividieron en dos grupos (n = 21). Estos grupos se trataron de la siguiente manera: Grupo A: Grabado ácido con H3PO4 37% en gel durante 15 segundos; Grupo B: NaOCl 5% durante 60 segundos + Grabado ácido con H3PO4 37% durante 15 segundos. Las muestras se prepararon para el análisis de microscopía electrónica de barrido. Las imágenes obtenidas se evaluaron principalmente por la calidad de los grabados tipo I y II de la superficie del esmalte primario, utilizando el software Image J. Los datos se analizaron en cuanto a su normalidad mediante la prueba de KolgomorvSmirnov, se utilizó pruebas no paramétricas: Prueba de MannWhitney no pareada. Como resultado, se encontró que el área de superficie media de los valores de patrón de grabado de tipo I y II para el Grupo A era 1922,314 µm2 y el Grupo B era 3840,473 µm2. Finalmente, llegamos a la conclusión de que se puede usar la desproteinización con NaOCl 5% antes del grabado ácido para aumentar el área de adhesión y la calidad del patrón de grabado (AU)


Assuntos
Humanos , Ácidos Fosfóricos , Hipoclorito de Sódio , Dente Decíduo , Condicionamento Ácido do Dente/métodos , Esmalte Dentário/efeitos dos fármacos , Peru , Técnicas In Vitro , Microscopia Eletrônica de Varredura , Análise Estatística
10.
J Adhes Dent ; 20(6): 527-534, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30564799

RESUMO

PURPOSE: To evaluate the roles of MDP and NaF in the bonding resin of a two-step self-etch adhesive (2-SEA) on enamel bonding performance. MATERIALS AND METHODS: The experimental 2-SEAs were composed of an MDP-containing self-etching primer and four different bonding resins which were MDP- and NaF-free (00), MDP-containing and NaF-free (M0), MDP-free and NaF-containing (0F), and MDP- and NaF-containing (MF) adhesives. Microshear bond strength (µSBS) to enamel and ultimate tensile strength (UTS) of the adhesive resin were determined. The morphological characteristics of the adhesive-enamel interface after acid-base challenge were observed using SEM to evaluate the acid-base resistant zone (ABRZ). RESULTS: No decrease in µSBS was observed even after thermocycling (TC) in 00, 0F and MF. However, the µSBS of M0 significantly decreased after TC. The UTS of M0 significantly decreased after 1- and 180-day storage in water. SEM observations indicated that ABRZ was present in all groups. However, formation of erosion beneath the ABRZ was observed in M0 and 00, whereas formation of a slope without erosion was observed at the bottom of the ABRZ in MF. CONCLUSION: In the experimental 2-SEAs, the addition of MDP alone to the adhesive resin did not contribute to an improvement in enamel bonding durability and interfacial morphology, whereas the addition of NaF in the adhesive resin demonstrated an enhancement of the bonding durability and improvement of acid resistance at the bonded interface.


Assuntos
Condicionamento Ácido do Dente/métodos , Colagem Dentária , Adesivos Dentinários , Metacrilatos , Fluoreto de Sódio , Esmalte Dentário/ultraestrutura , Humanos , Teste de Materiais , Microscopia Eletrônica de Varredura , Propriedades de Superfície , Resistência à Tração
11.
Braz Dent J ; 29(5): 492-499, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30517449

RESUMO

This study evaluated the effect of different hydrofluoric acid (HF) concentrations on the bond strength between a lithium disilicate-based glass ceramic and a resin cement. Eighty ceramic-blocks (12×7×2 mm) of IPS e.Max CAD (Ivoclar Vivadent) were produced and randomly assigned to 8 groups, considering 2 study factors: HF concentration in 4 levels, i.e., 1% (HF1), 3% (HF3), 5% (HF5), and 10% (HF10), and storage in 2 levels, i.e., baseline (tests were performed 24 h after cementation), and aged (storage for 150 days + 12,000 thermal-cycles at 5°C and 55°C). Acid etching (20 s) was performed, followed by washing, drying, and silanization. Four resin cement cylinders (ϕ= 0.96 mm) were built-up from starch matrices on each ceramic sample (n= 40). Additional ceramic samples were etched and analyzed for contact angle, micro-morphology, and roughness. In baseline condition (without aging), the HF3, HF5, and HF10 groups showed similar bond strength values (13.9 - 15.9 MPa), and HF1 (11.2 MPa) presented lower values than HF5, being that statistically different (p= 0.012). After aging, all the mean bond strengths statistically decreased, being that HF3, HF5, and HF10 (7.8 - 11 MPa) were similar and higher than HF1 (1.8 MPa) (p= 0.0001). For contact angle, HF3, HF5, and HF10 presented similar values (7.8 - 10.4°), lower than HF1 and CTRL groups. HF5 and HF10 presented rougher surfaces than other conditions. For better bond strength results, the tested ceramic may be etched by HF acid in concentrations of 3%, 5%, and 10%.


Assuntos
Condicionamento Ácido do Dente/métodos , Cerâmica/química , Colagem Dentária/métodos , Porcelana Dentária/química , Ácido Fluorídrico/química , Cimentos de Resina/química , Teste de Materiais , Microscopia de Força Atômica , Resistência ao Cisalhamento , Estresse Mecânico , Propriedades de Superfície
12.
Niger J Clin Pract ; 21(12): 1564-1569, 2018 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-30560818

RESUMO

Aim: To clinically assess the efficacy of resin infiltration versus fluoride varnish for arresting white spot lesions (WSLs) on permanent teeth in children. Subjects and Methods: Among the children referred to the our University, Faculty of Dentistry, Department of Pediatric Dentistry, 23 aged between 8-14 with 81 anterior WSLs were included in the study. The participants were randomly assigned to either the resin infiltration group or the fluoride varnish group. WSLs were assessed using a laser fluorescence device (DIAGNOdent pen, Kavo, Germany) and were characterized at baseline, immediately following resin infiltration application and at a 6-month follow-up. For the statistical analyses, the IBM SPSS Statistics 22 (IBM SPSS, Turkey) program was used to assess the findings of the study. Results: Participant retention was 100% at 6 months. There was no significant difference between the two groups when baseline DIAGNOdent (DD) values were compared (P > 0.05). The reduction in 6-month follow-up DD values were statistically significant in both groups relative to baseline values. The 6-month values of the resin infiltration group were statistically lower than those of the fluoride varnish group (P = 0.028, P < 0.05). Conclusions: Resin infiltration and fluoride varnish are clinically feasible and efficacious methods for the treatment of anterior WSLs. The inhibition of caries progression by resin infiltration should now be considered an alternative to fluoride treatment.


Assuntos
Condicionamento Ácido do Dente/métodos , Cariostáticos/uso terapêutico , Resinas Compostas/uso terapêutico , Cárie Dentária/tratamento farmacológico , Fluoretos Tópicos/uso terapêutico , Fluoretos/uso terapêutico , Braquetes Ortodônticos/efeitos adversos , Resinas Sintéticas/química , Remineralização Dentária/métodos , Adolescente , Criança , Cárie Dentária/diagnóstico , Restauração Dentária Permanente , Dentição Permanente , Feminino , Humanos , Masculino , Resultado do Tratamento , Turquia
13.
Niger J Clin Pract ; 21(11): 1444-1449, 2018 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-30417842

RESUMO

Objectives: The aim of this study was to evaluate the changes in opacities by applying resin infiltrate to developmental enamel opacities and applying resin infiltrate or fluoride varnish to white spot lesions (WSLs). Materials and Methods: A total of 132 teeth with WSLs and developmental enamel opacities were included in the study. WSLs were treated with resin infiltrate (Group 1) and fluoride varnish (Group 2), and developmental enamel opacities were treated with only resin infiltrate (Group 3). Lesions were evaluated in accordance with International Caries Detection and Assessment System (ICDAS II) criteria and DIAGNOdent Pen scores before applying the material (T0), just after the application (T1), and after 1 month (T2) and 3 months (T3). Results: A significant decrease in DIAGNOdent Pen scores was observed in all the groups and the most important decrease was seen in Group 2 (P < 0.05). A significant decrease in ICDAS II scores was observed in Groups 2 and 3 (T0-T1) and Group 1 (T1-T2) (P < 0.05). Conclusion: DIAGNOdent pen scores decreased and the lesion was partially masked after resin infiltrate was applied to treat developmental enamel opacities; the resin infiltrate application, however, was more successful than fluoride varnish on WSLs. Treating WSLs with resin infiltrate was a good option due to shorter term esthetic recovery and high patient satisfaction.


Assuntos
Condicionamento Ácido do Dente/métodos , Cariostáticos/uso terapêutico , Resinas Compostas/uso terapêutico , Cárie Dentária/prevenção & controle , Materiais Dentários/química , Fluoretos Tópicos/uso terapêutico , Fluoretos/uso terapêutico , Resinas Sintéticas/química , Adulto , Restauração Dentária Permanente , Humanos , Fosfatos , Resultado do Tratamento
14.
J Adhes Dent ; 20(5): 407-415, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30417896

RESUMO

PURPOSE: To evaluate the effect of selective phosphoric acid etching on enamel using "no-wait" self-etching adhesives. MATERIALS AND METHODS: Clearfil Universal Bond Quick (UBQ, Kuraray Noritake) or G-Premio BOND (GPB, GC) was applied to ground human enamel surfaces. The adhesives were used in 3 modes: no-waiting self-etching mode (UBQ-0 or GPB-0), 10-s self-etching mode (UBQ-10 or GPB-10), and the selective-etch mode with phosphoric acid etching (UBQ-PA or GPB-PA). After an acid-base challenge, the morphological attributes of the interface were examined using scanning electron microscopy (SEM) to characterize the acid-base resistant zone (ABRZ). Microshear bond strength (µSBS) testing to enamel and ultimate tensile strength (UTS) of the adhesive resin were carried out. RESULTS: ABRZ formation was confirmed in all groups. UBQ-PA and GPB-PA created thicker ABRZ with no funnel-shaped erosion beneath the adhesive-enamel interface. µSBS of UBQ-PA was significantly higher than UBQ-0 and UBQ-10 (p < 0.05). However, there were no statistically signficant differences in µSBS among GPB-0, GPB-10, and GPB-PA. For the UTS, UBQ was significantly higher than GPB. CONCLUSION: Selective phosphoric acid etching created a stable adhesive-enamel interface. The no-waiting self-etching concept adhesive led to a thinner ABRZ. The results of µSBS suggest that phosphoric acid etching effects on enamel are material dependent.


Assuntos
Condicionamento Ácido do Dente/métodos , Colagem Dentária/métodos , Esmalte Dentário/efeitos dos fármacos , Adesivos Dentinários/química , Ácidos Fosfóricos/química , Cimentos de Resina/química , Análise do Estresse Dentário , Humanos , Técnicas In Vitro , Teste de Materiais , Metacrilatos , Microscopia Eletrônica de Varredura , Propriedades de Superfície , Resistência à Tração , Fatores de Tempo
15.
Braz Oral Res ; 32: e102, 2018 Oct 11.
Artigo em Inglês | MEDLINE | ID: mdl-30328899

RESUMO

The aim of this study was to evaluate the effect of ethanol on the bond longevity of a universal adhesive system to bovine dentin, under different modes of adhesive application and artificial aging. Bovine dentin was exposed, and the smear layer was standardized by sandpaper polishing. Specimens were randomly divided into 2 groups: ethanol (E) and non-ethanol (N). Groups were subdivided according to adhesive mode of application into etch-and-rinse (Er) and self-etching (S). Resin blocks were built onto the treated surface, and the specimens were stored in deionized water at 37°C for 48 h. Half of the specimens (n = 10) were subjected to thermomechanical aging (A for aged and Na for non-aged). Resin/dentin beams were obtained and subjected to microtensile test in a universal testing machine. Data were analyzed using a three-way ANOVA and Tukey's tests (α = 5%). There was interaction among the three factors (p=0.0003). The use of ethanol resulted in higher values, except for the Er and Na groups (E_Er_Na = N_Er_Na). The mode of application was similar, except for the N and A groups (N_S_A > N_Er_A). For the A groups, the values were lower, except in the cases using ethanol, in which the results were not affected. The study concluded that the use of ethanol resulted in higher microtensile bond strength values, even after aging. The mode of adhesive application did not influence the results.


Assuntos
Colagem Dentária/métodos , Adesivos Dentinários/análise , Dentina/química , Dentina/efeitos dos fármacos , Etanol/química , Cimentos de Resina/química , Condicionamento Ácido do Dente/métodos , Animais , Bovinos , Colágeno/química , Teste de Materiais , Valores de Referência , Reprodutibilidade dos Testes , Camada de Esfregaço , Propriedades de Superfície , Temperatura , Resistência à Tração , Fatores de Tempo
16.
Microsc Res Tech ; 81(9): 997-1003, 2018 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-30341967

RESUMO

The aim of the present study was to identify the stage during acid etching of dental enamel where scratches introduced by sectioning and grinding procedures were eliminated. Nitric acid was used as etchant. Four hundred 2-3 mm-thick longitudinal sections of human third molar crowns were assigned to 80 groups, each group differing with respect to grinding procedure (silicon carbide paper grit 600; 1,000; 1,200; and 1,200 + polishing), acid concentration (0.1%, 1%, 2.5%, and 5%) and etching time (15, 30, 45, 90, and 180 s). Observation of the specimens with scanning electron microscopy (SEM) showed that elimination of scratches was facilitated by increasing fineness of grinding paper and polishing, and by increasing acid concentration and increasing etching time. An acid concentration of 0.1% did not remove scratches totally irrespective of grinding procedure or etching time, 1% acid removed most scratches after 45-90 s, while 2.5% and 5% acids removed most scratches after 30-45 s. It is proposed that the scratches are eliminated/obscured through a combined effect of the acid and the inherent structure of the enamel. The results of the present study may serve as a guide in choosing the best procedures for obtaining scratch-free enamel surfaces through acid etching with the least possible loss of enamel substance. Research highlights Sectioning and grinding produce scratches in dental enamel. Scratches are eliminated by acid etching prior to SEM studies of enamel structure. Scratch elimination increases with increasing acid strength and etching time and is facilitated by finer grit grinding paper and polishing.


Assuntos
Condicionamento Ácido do Dente/métodos , Esmalte Dentário/ultraestrutura , Polimento Dentário/métodos , Microscopia Eletrônica de Varredura , Dente Molar/ultraestrutura , Esmalte Dentário/efeitos dos fármacos , Humanos , Dente Molar/efeitos dos fármacos , Ácido Nítrico/uso terapêutico , Resultado do Tratamento
17.
Niger J Clin Pract ; 21(10): 1317-1322, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-30297565

RESUMO

Objectives: The purpose of this in vitro study was to investigate the effect of three different enamel surface conditioning procedures on the bonding strength of two resin-based filled fissure sealants. Material and Methods: Freshly extracted, 48 third molar teeth were used in this study. Teeth were randomly divided into three main groups as the phosphoric acid etched, erbium: Yttrium-aluminum-garnet (ER: YAG) laser etched, and the phosphoric acid plus ER: YAG laser-etched groups. The main groups further divided into two subgroups as Clinpro or Fissurit FX applied. After preparation of the enamel surfaces and application of the sealants, the samples were subjected to shear bond strength test. Results: According to statistical analysis with one-way ANOVA, the bonding strength values of the phosphoric acid groups were found significantly higher than those values obtained from the ER: YAG laser and ER: YAG laser plus phosphoric acid groups (P < 0.001). Conclusion: As a result of the study, it has been concluded that the laser application alone has no additional benefit to the acid application in terms of bonding strength.


Assuntos
Alumínio , Colagem Dentária/métodos , Esmalte Dentário/química , Érbio , Lasers de Estado Sólido/uso terapêutico , Ácidos Fosfóricos , Selantes de Fossas e Fissuras , Ítrio , Condicionamento Ácido do Dente/métodos , Humanos
18.
Photomed Laser Surg ; 36(11): 614-620, 2018 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-30227090

RESUMO

OBJECTIVE: To evaluate whether Er:YAG laser etching could be an alternative surface treatment to hydrofluoric (HF) acid etching. BACKGROUND: Surface treatment is important to bonding properties and utility times of computer aided design/computer aided manufacture (CAD/CAM) dental ceramics. The traditional method of HF acid etching is harmful to humans if not handled properly. MATERIALS AND METHODS: Four different CAD/CAM ceramics (Vita Mark II, IPS Empress CAD, IPS e.max CAD, and Vita Enamic) were cut into 72 blocks and divided into 6 groups according to different surface treatments (n = 12): Group A: no treatment; Group B: HF acid; and Group C to F: different Er:YAG laser power settings (300, 400, 500, and 600 mJ). Ten blocks of each group were measured for shear bond strength (SBS) and the failure modes were evaluated; the rest blocks were observed by scanning electronic microscopy (SEM). RESULTS: HF acid etching resulted in the highest SBS for Vita Mark II, IPS Empress CAD, and Vita Enamic; however, the difference was not statistically significant (p > 0.05) compared to the second highest group of laser with 600 mJ in IPS Empress CAD. For IPS e.max CAD, the highest SBS was obtained from laser group with 400 mJ. The SBS results were consistent with failure modes and surface characterizations in SEM images. CONCLUSIONS: Our results showed that Er:YAG laser had little impact on Vita Mark II and Vita Enamic; but proper power settings could be an alternative surface treatment to HF acid etching (600 mJ for IPS Empress CAD and 400 mJ for IPS e.max CAD).


Assuntos
Cerâmica/química , Corrosão Dentária/métodos , Lasers de Estado Sólido , Condicionamento Ácido do Dente/métodos , Silicatos de Alumínio , Desenho Assistido por Computador , Porcelana Dentária , Ácido Fluorídrico/química , Teste de Materiais , Microscopia Eletrônica de Varredura , Resistência ao Cisalhamento , Propriedades de Superfície
19.
Photomed Laser Surg ; 36(11): 608-613, 2018 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-30227107

RESUMO

OBJECTIVE: To compare the shear bond strength (SBS) values of orthodontic brackets luted using a resin-modified glass ionomer cement (RMGIC) on enamel surfaces etched using either an Er:YAG laser in two different working modes, or a conventional etching protocol, including phosphoric acid. MATERIALS AND METHODS: Sixty healthy human premolars were randomly allocated to three experimental groups (n = 20) and etched with: Group 1: Er:YAG laser in super-short pulse (SSP) mode (100 mJ, 20 Hz, 2 W); Group 2: Er:YAG laser in quantum square pulse mode (120 mJ, 10 Hz, 1.2 W) using a digitally controlled handpiece ("X-Runner"); Group 3 (control): 5.25% sodium hypochlorite pretreatment, then 37% phosphoric acid for 15 sec. Stainless steel brackets were bonded using light-curing RMGIC for orthodontic bonding. After term cycling (1800 cycles), SBS testing was performed using a universal testing machine. After debonding, both enamel and bracket surfaces were examined to determine the amount of RMGIC still present on the surfaces. RESULTS: Group 3 surfaces gave the lowest mean SBS (10.6104 ± 2.66196 MPa), whereas Group 1 provided the highest 1 (13.1795 ± 3.37904 MPa), which was significantly different from the control (Group 3, p = 0.0226). Group 2 provided intermediate values (11.8486 ± 0.59832 MPa) nonsignificantly different from the control or from SSP (p = 0.4215 and p = 0.3082, respectively). CONCLUSIONS: Er:YAG laser treatment in SSP mode of enamel surfaces for orthodontic bonding provided higher SBS and a shear behavior of the luting material similar to the conventional acid-etching procedures, making it a viable alternative to acid etching.


Assuntos
Colagem Dentária/métodos , Corrosão Dentária/métodos , Cimentos de Ionômeros de Vidro/química , Lasers de Estado Sólido , Braquetes Ortodônticos , Condicionamento Ácido do Dente/métodos , Dente Pré-Molar , Descolagem Dentária , Humanos , Técnicas In Vitro , Teste de Materiais , Ácidos Fosfóricos , Resistência ao Cisalhamento , Hipoclorito de Sódio , Propriedades de Superfície
20.
Gen Dent ; 66(5): 33-37, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30188854

RESUMO

Manufacturers have recently introduced surface primers and pretreatment solutions that reportedly simplify the bonding process of resin cements to ceramics through various combinations of etchant and coupling agents. This study evaluated the shear bond strength (SBS) of a resin cement to a lithium disilicate glass-ceramic material pretreated with various new surface treatment solutions and compared the results to those of a control group prepared with the traditional application of hydrofluoric acid (HF) and silane. Resin cement was bonded to pretreated glass-ceramic surfaces, and specimens were tested for SBS after 24 hours of storage in water. Traditional surface treatment of lithium disilicate glass ceramic with HF and silane resulted in a significantly greater mean SBS than did simplified primer solutions. There were no statistically significant differences among the simplified pretreatment groups. In the control group, the majority of failures were due to mixed adhesive-cohesive fracture, while in the simplified treatment groups the failure mode was usually adhesive, suggesting a weaker interface.


Assuntos
Cerâmica , Colagem Dentária/métodos , Cimentos de Resina/uso terapêutico , Condicionamento Ácido do Dente/métodos , Corrosão Dentária/métodos , Porcelana Dentária , Análise do Estresse Dentário , Humanos , Ácido Fluorídrico/uso terapêutico , Silanos/uso terapêutico
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