European Journal of Molecular & Clinical Medicine

Abstract

Introduction: Hyperbaric pressure is a condition of environmental pressure that is greater than 1 atmosphere experienced by divers. Hyperbaric pressure can damage the teeth, as well as restorations. The use of fiber posts in post-endodontic restorations has limitations in adapting the shape of the post to the root canal which can cause the thicker of resin cement so that the risk of void formation will be greater. This study aims to evaluate the effect of hyperbaric pressure on fracture resistance and fracture patterns in different post systems.
            Materials and methods: Forty extracted single root mandibular premolars were decoronated 2 mm above the CEJ and endodontic treatment was done. The teeth were divided into four groups: SFP1 (Single prefabricated fiber post with 1 ATA air pressure), SFP4 (Single prefabricated fiber post with 4 ATA air pressure), AFP4 (Anatomic fiber post with 1 ATA air pressure), AFP4 (Anatomic fiber post with 4 ATA air pressure). All posts were cemented with dual cure resin cement with total etch adhesive system. The core and crown were made clinically with direct composite resin and then carried out a thermoycling process for 200 cycles. Groups B and D was put in to hyperbaric chamber with pressure changes from 1 ATA to 4 ATA for 24 cycles. The fracture test was performed using a Universal Testing Machine (UTM) with static load was applied to the axial tooth at a speed of 0.5 mm/min until fracture occurred and the fracture pattern was observed. The data obtained was tested with one-way analysis of variance (ANOVA), while for fracture patterns with categorical data were tested using Kruskal Wallis Test.