Two possible in vitro alternatives to evaluate the effect of gastric acid on resin-based composites

Objective: To compare two in-vitro protocols to study the effect of simulated gastric acid on the mechanical properties of resins based composites(RBCs). Three RBC FILTEK Supreme XTE (FS), BRILLIANT EverGlow (BE), GrandioSo (GS) were used. They were ra

Preparaciones dentarias en prótesis fija dentosoportada: revisión sistemática

Los principios de la preparación del diente se dividen habitualmente en tres partes fundamentales: biológicos, biomecánicos y estéticos. Los factores biológicos influyen en la salud de los tejidos periodontal y pulpar; los biomecánicos (o técnicos), van a afectar la integridad y durabilidad de las restauraciones, y factores estéticos se refieren a la apariencia natural de las restauraciones, y factores estéticos se refieren a la apariencia natural de las restauraciones. Estos principios son rutinariamente modificados para adaptarse a diversas situaciones clínicas. Una adecuada preparación de la pieza dentaria destinada a un tratamiento prostodóntico deberá permitir la reproducción exitosa de los contornos anatómicos y perfiles de emergencia. Además brindar un espesor apropiado para cada tipo de estructura, sin superar las limitaciones de cada material, así como mantener la integridad biológica de los tejidos involucradosThe principles of tooth preparation are commonly as: biological, biomechanical an aesthetic. Biological factors are influencing the health of periodontal tissues and pulp, the biomechanical (or technical) will affect the integrity and durability of the restorations, and aesthetic factors are related to the natural appearance of the restorations. These principles are routinely modified to suit various clinical situations. Proper tooth preparation intended to prosthodontics treatment should allow successful reproduction of anatomical contours and emergence profiles. Besides providing an appropiate thickness for each type of structure, without exceeding the limitations of each material as well as maintain the biological integrity of the related tissuesEspecialista en Rehabilitación OralCuenc

Two possible in vitro alternatives to evaluate the effect of gastric acid on resin-based composites

Background: Objective: To compare two in-vitro protocols to study the effect of simulated gastric acid on the mechanical properties of resins based composites(RBCs). Material and Methods: Three RBC FILTEK Supreme XTE (FS), BRILLIANT EverGlow (BE), GrandioSo (GS) were used. They were randomly divided into a control group (CG) and two groups exposed to simulated gastric acid: a 6-month daily protocol (DG) and an accelerated 90-min protocol (AG). Vickers microhardness (VH) and flexural strength were evaluated at baseline and six months. Statistical analysis was performed using repeated measures ANOVA tests for VH and three-way for flexural strength data (α=0.05). Results: Daily exposure in the CG and DG groups caused a reduction in VH values and flexural strength (p<0.05). The majority of values in the AG remained stable, after an exposure of 90 min; FS (p=0.118) and GS (p=0.729) in VH and FS (p=0.377), BE (p=0.692) and GS (p=0.672) in flexural strength. Conclusions: Daily exposure during 6 months caused significant changes in the VH values and flexural strength of the RBCs. The acid-accelerated protocol did not cause the same magnitude of change in VH values and flexural strength seen at six months of daily exposure © 2022,Journal of Clinical and Experimental Dentistry