Fracture Resistance of Different Complex Class II Restoration Techniques with Two Bucco-lingual Widths

Authors

1 Demonstrator of Operative Dentistry Department, Faculty of Dental Medicine for Girls, Al-Azhar University, Egypt.

2 . Professor of Operative Dentistry, Faculty of Dental Medicine for Girls, Al-Azhar University, Egypt

3 Associate Professor of Operative dentistry, Faculty of Dental Medicine for Girls, Al-Azhar University, Egypt

Abstract

Purpose: This study aimed to evaluate the effect of different restoration techniques using either nano-hybrid composite alone or with an underlying fiber reinforced composite or flowable composite within two bucco-lingual cavity widths of Class II (MOD) cavities on the fracture resistance. Materials and Methods: Forty-eight maxillary premolars were selected and divided into three main groups according to the restoration techniques (n= 16 each) as follows A1: All nano-hybrid composite (Essentia Universal) in all the 4 mm cavity depth, A2: 2 mm fiber reinforced composite (everX Posterior) covered by 2 mm nano-hybrid composite (Essentia Universal), and A3: 2 mm flowable composite (everX Flow) covered by 2 mm nano-hybrid composite (Essentia Universal). Each group is subdivided into two subgroups according to Class II cavity width (i.e., 8 each) B1: 2 mm and B2: 3.5 mm buccolingual width. Specimens were mounted in cold cure acrylic resin blocks then thermocycled at 5-55˚C for 2000 cycles. The fracture resistance test was done using universal testing machine. Results: ANOVA test was performed. All nano-hybrid composite revealed a statistically significant lower fracture resistance mean values than both reinforced/ nano-hybrid and flowable/nano-hybrid. There was no statistically significant difference between both reinforced/ nano-hybrid and flowable/nano-hybrid. Also, there were no statistically significant difference between the two cavity width on tooth fracture resistance. Conclusions: The fracture resistance of both reinforced and flowable composite covered with nano-hybrid composite were higher than all nano-hybrid composite and the difference of cavity buccolingual width didn’t affect the teeth fracture resistance.

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