FRACTURE RESISTANCE OF BIOACTIVE RESTORATIVE MATERIALS IN CLASS II CAVITY OF UPPER PREMOLARS

Abstract

The objective of this in-vitro study was to compare fracture resistance of two bioactive restorative materials and resin composite in class II MOD of upper premolar after 10,000-time thermocycling between 5 and 55°c. Three groups of sound extracted upper premolars(16 teeth/group) were prepared with class II MOD cavities and restored with ACTIVA™ Bioative-Restorative (group 1), CentionN™ (group 2) and Filtek™ Z350XT (group 3). After 10,000-time thermocycling, the samples were tested for fracture resistance. Loading force with 3 mm-round steel that connected to Universal testing machine at a crosshead speed of 1 mm/min. The fracture patterns were evaluated. Data were analyzed with One-way ANOVA and Bonferrini post hoc. The results of the study revealed that the fracture resistance of each material is significantly different (p < 0.05). The resin composite showed the highest fracture resistance, followed by the ACTIVA™ group and CentionN™ group. There is significant difference between Filtek™ Z350XT and CentionN™ (p < 0.05). Restorable fracture pattern of resin composite restored tooth is the highest group (44%), followed by ACTIVA™ Bioative-Restorative (18%) and CentionN™ (12%)