Performance of giomer-based resin composites under erosive wear and its influence on the adjacent enamel alteration: in vitro study

• Autor(a) principal: Bergantin, Bianca Tozi Portaluppe
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Biblioteca Digital de Teses e Dissertações da USP
• Texto Completo: http://www.teses.usp.br/teses/disponiveis/25/25145/tde-28082019-193402/
• topic: Dental erosion; Dental materials; Desgaste dentário; Erosão dentária; Materiais dentários; Tooth wear

Erosive tooth wear is the permanent loss of hard dental tissue by the frequent action of chemical and mechanical challenges. This condition has shown an increase in its prevalence in recent years, requiring intervention in the process, ideally through preventive therapies, however, these lesions often need restorative therapies. The objective of this study was to test the use of Giomer-based resins under conditions of erosive tooth wear and its effect on adjacent enamel compared to conventional composite resin and glass ionomer cement by means of an in vitro evaluation, leading to taking into account its differentiated recharge and fluoride release technology, satisfactory aesthetics and resistance and its ability to neutralize acid pH. For that, 120 specimens of bovine teeth were obtained, selected and randomly distributed in 12 groups (n = 10): GI: Composite Nano-Hybrid Resin with Giomer technology (EROSION); GII: Composite Nano-Hybrid resin with Giomer technology (EROSION + ABRASION); GIII: Resin Composed of single increment with Giomer technology (EROSION); GIV: Composite resin of single increment with Giomer technology (EROSION + ABRASION); GV: Micro-Hybrid Composite Resin (EROSION); GVI: Micro-Hybrid Composite Resin (EROSION + ABRASION); GVII: Single-increment Micro-Hybrid Composite Resin (EROSION); GVIII: Single-increment Micro-Hybrid Composite Resin (EROSION + ABRASION); GIX: Conventional Glass Ionomer Cement - CIVC (EROSION); GX: Conventional Glass Ionomer Cement - CIVC (EROSION + ABRASION); GXI: Resin Modified Glass Ionomer Cement - CIVMR (EROSION); GXII: Resin Modified Glass Ionomer Cement - CIVMR (EROSION + ABRASION). In each enamel specimen a cavity was made and the restorative material was inserted under study according to the manufacturer\'s specifications. The initial profile was then performed, with scans of the material and the adjacent enamel (at 100, 200, 300, 600 and 700m). During 5 days, 6 erosive challenges were performed with citric acid for 2 minutes and in the EROSION + ABRASION groups the brushing was performed for 1 minute in a simulated brushing machine, immediately after erosion and washing. Subsequently the final profile was made in the same locations of the initial, for graphic overlap and analysis of loss of material and enamel. The data were evaluated for normality and homogeneity by two-way ANOVA and then the Tukey test was used for comparison between groups, considering p <0,05. When subjected to erosion, the GIX and GXI groups presented greater loss of material compared to the other groups. Up to 300m away from the restoration, the GIC groups and Giomer-based resins were able to promote less enamel loss than the conventional resin. For erosion associated with abrasion, Giomer-based resins showed intermediate loss of material, with greater loss in ionomeric groups and lower loss in conventional resin, with no difference between adjacent enamel in these conditions. It was concluded that Giomer-based resins are a good alternative for restorative treatment of erosion lesions.