Marginal Integrity of Composite Restoration with and without Surface Pretreatment by Gold and Silver Nanoparticles vs Chlorhexidine: A Randomized Controlled Trial.

AIM: This study was conducted to evaluate the marginal adaptation, marginal staining, and postoperative sensitivity of resin composite restorations after disinfection of class II cavities with NanoCare Gold and chlorhexidine in class II cavities immediately, after 6 months, 1, and 2 years using World Dental Federation (FDI) criteria for assessment of dental restorations. MATERIALS AND METHODS: In this study, 19 participants were recruited, 3 carious lesions in each one. After preparation of these lesions, they were randomly allocated into three parallel groups according to the disinfection protocol. The first group was for NanoCare Gold, the second was for chlorhexidine, and the third was for the control. The three groups were evaluated clinically and radiographically using (FDI) criteria at different intervals till 2 years of clinical service. RESULTS: There was no statistically significant difference in age, gender, arch, and tooth type distribution among study groups. Regarding marginal adaptation, there was no statistically significant difference among the different groups but the difference was only statistically significant within each group after 2 years. Regarding the marginal staining, the difference was only significant between the NanoCare and the other groups after 2 years. In case of postoperative sensitivity, there was no statistically significant difference among the different groups and within each one at different intervals. CONCLUSION: NanoCare Gold could be promising in durability preservation of direct tooth-colored restorations. Marginal staining and postoperative sensitivity are regulated by other factors than surface pretreatment. CLINICAL SIGNIFICANCE: As long as restorations are inserted under rubber dam isolation, proper application steps, proper filling, and adequate finishing and polishing, the performance of the restorations would be satisfactory up to 1 year without any surface disinfection. However, after a longer follow-up, some changes may be noticed. NanoCare Gold and chlorhexidine are accepted as a cavity disinfectant without any negative effect on marginal adaptation of resin composite restorations.

Clinical Performance of Direct Anterior Composite Restorations Using Esthetic Dual-Shade versus Polychromatic Natural Layering Technique: a split mouth randomized controlled clinical tria / Avaliação clínica do comportamento de desgaste do esmalte humano e lascamento da zircônia de cobrimento contra a zircônia monolítica (ensaio clínico randomizado controlado)

Objective: to evaluate the clinical performance of the dual shade layering and polychromatic resin composite layering techniques using a randomized controlled trail. Material and Methods: 42 participants (84 restorations) of class IV or class III through and through within a pair of anterior contra-lateral teeth were randomly allocated into two groups according to technique of composite restoration placement: control "polychromatic layering" and intervention "dual-shade layering". Follow-up was done at 1 month (baseline) and 1 year. Restorations were evaluated using Visual Analog Scale (VAS), restoration color shade match using Vita Easyshade V ®, and blinded assessor using FDI criteria for assessment of dental restorations measuring (aesthetic properties). Chi-square test was used to compare between restorations of both techniques. Results: There was no statistically significant difference between restorations of both techniques for patient satisfaction outcome, restorations color match outcome, and for all tested FDI outcomes except surface luster with 100% success. Conclusion: Bothdual-shade layering and polychromatic natural layering techniques, exhibited acceptable clinical and esthetic performance (AU)

Objetivo: Avaliar o comportamento de desgaste do esmalte humano e lascamento de zircônia de cobrimento e monolítica para restaurações posteriores de cobertura total. Material e métodos: Trinta e quatro restaurações de zircônia de cobertura total (dezessete em cada grupo) foram fabricadas. Os pacientes foram divididos em dois grupos de acordo com o tipo de zircônia utilizada; grupo 1 (grupo comparador) coroas com zircônia de cobrimento e grupo 2 (grupo de intervenção) coroas únicas de zircônia monolítica. Todas as coroas foram fabricadas e polidas em laboratório. Para medidas de desgaste de dentes opostos, foi utilizado um perfilômetro 3D sem contato, onde réplicas de resina epóxi foram construídas para o arco oposto imediatamente após a cimentação das coroas, três, seis e doze meses. O lascamento da restauração foi medido usando critérios modificados dos Serviços de Saúde Pública dos Estados Unidos (USPHS). Resultados: Todas as restaurações foram relatadas como alfa sem lascamento. Não houve diferença estatisticamente significativa entre (Grupo 1) e (Grupo 2) para o teste de desgaste. Conclusão: As restaurações monolíticas e de cobrimento revelaram propriedades mecânicas satisfatórias sem lascamento após um ano de uso clínico. O desgaste do esmalte oposto foi clinicamente aceitável para ambos os materiais (AU)