Fracture resistance of premolars restored by various types and placement techniques of resin composites

Moosavi, H. and Zeynali, M. and Pour, Z. H. (2012) Fracture resistance of premolars restored by various types and placement techniques of resin composites. International Journal of Dentistry.

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Abstract

To verify the fracture resistance of premolars with mesioocclusodistal preparations restored by different resin composites and placement techniques. Sixty premolars were randomly divided into two groups based on type of composite resin: Filtek P60 or Nulite F, and then each group was separated into three subgroups: bulk, centripetal, and fiber insert according to the type of placement method (n = 10). Single-bond adhesive system was used as composite bonding according to the manufacturer's instructions. Specimens were restored in Groups 1, 2, and 3 with Filtek P60 and in Groups 4, 5, and 6 with Nulite F. After being stored 24 hours at 37 °C, a 4mm diameter steel sphere in a universal testing machine was applied on tooth buccal and lingual cusps at a cross-head speed of 5mm/min until fracture occurred. Groups 3 and 6 showed higher fracture resistance than Groups 1, 2, 4, and 5. Among the placement techniques, the fiber insert method had a significant effect, but the type of composite was ineffective. The insertion technique in contrast to the type of material had a significant influence on the fracture resistance of premolar teeth. © 2012 Horieh Moosavi et al.

Item Type: Article
Additional Information: Cited By :10 Export Date: 16 February 2020 Correspondence Address: Moosavi, H.; Dental Material Research Center, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad 91735, Iran; email: dentist57@yahoo.com
Subjects: WU Dentistry. Oral surgery
Divisions: Mashhad University of Medical Sciences
Depositing User: mr lib5 lib5
Date Deposited: 06 May 2020 06:24
Last Modified: 06 May 2020 06:24
URI: http://eprints.mums.ac.ir/id/eprint/18989

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