Online ISSN: 2515-8260

Author : Abidin, Trimurni

Effect Of Hyperbaric Pressure in Diving Simulation To Fracture Strength And Fracture Pattern On Different Post System of Endodontically Treated Teeth: An in-vitro study

Debora Natalyna; Trimurni Abidin; Wandania Farahanny

European Journal of Molecular & Clinical Medicine, 2022, Volume 9, Issue 8, Pages 1058-1069

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. 

A Simulation of Fracture Resistance and Stress Distribution of Endocrown Post-Endodontic with Different Materials and Types of Luting Cement: Finite Element Analysis (FEA)

Muhammad Kadafi Hasibuan; Trimurni Abidin; M. Sabri

European Journal of Molecular & Clinical Medicine, 2022, Volume 9, Issue 8, Pages 1046-1057

Aim: The purpose of this finite element analysis (FEA) was to compare and evaluate the fracture resistance and stress distribution of endodontically treated teeth restored with endocrown in different materials and types of luting cement.
Material and Methods:Four endodontically treated teeth first mandibular molar restored with an endocrown was modeled by using CAD software and imported into an FEA software. The models were duplicated and the first model received restoration in lithium disilicate with RelyXUltimate (3M ESPE USA) cement, the second model in lithium disilicate with Panavia F 2.0 (Kuraray Noritake), the third model in zirconia with RelyX Ultimate (3M ESPE USA) and fourth model in zirconia with Panavia F 2.0 (Kuraray Noritake). Stress distribution under axial (90o) and non-axial degree(0o and 45o) by loading 225 Newton (mastication force) and 600 Newton (biting force) were analyzed. Results were determined by colorimetric von mises of maximum total deformation, equivalent elastic strain, and equivalent stress on a tooth, cement, and restoration.The results indicated that zirconia endocrown with Rely X and Panavia F.20 cement has better fracture resistance than the other model.The critical area of total deformation and the equivalent elastic strain was on the occlusal and the equivalent stress was in the cement-dentin interface.