Fracture Resistance of Occlusal Veneer on Premolar Teeth Using Two Different Preparation Designs

Document Type : Original Article

Authors

1 Dental Materials department.Assiut University,Assiut City

2 Department of Fixed prosth odontics ,Faculty of Oral and Dental Medicine South Valley University

3 Department of Pediatric den tistry and dental public health, Faculty of Oral and dental med icine, South Valley University, Qena, Egypt

10.21608/aadj.2025.430329

Abstract

 Aim: The purpose of this study was to investigate the fracture resistance and 
marginal gap of two different designs of occlusal veneers made of two different ceramic 
materials. Subjects and methods: In this study, sixty recently extracted maxillary 
premolars were utilized. Two groups of teeth were randomly selected based on the type 
of occlusal veneer material (n =30 each). The teeth in the first group were fixed using 
occlusal veneers made of advanced Lithium Disilicate (CEREC Tessera™, Dentsply 
Sirona, Germany)(T), whereas the polymer-infiltrated hybrid ceramic was used for the 
occlusal veneer in the second group. (Vita Enamic, Vita Zahnfabrik, Germany) (E). 
Each group was further subdivided into 2 subgroups (n =15 each) according to the 
preparation design. Traditional occlusal reduction was used to prepare the teeth in the 
f
 irst subgroup. (planner preparation)(P). In the second subgroup, the reduction of teeth 
included the occlusal surface and 1 mm axial reduction with rounded shoulder finish 
line (modified = M). The veneers were designed and manufactured using CAD/CAD 
technology. A universal testing machine was used to measure the fracture resistance. A 
single static compressive load was applied to each restoration along the tooth’s long axis 
until fracture occurred. A single static compressive load was applied to each restoration 
along the tooth’s long axis until fracture occurred. Results: The findings demonstrated 
that there was a statistically significant difference in the fracture resistance of the two 
preparation designs of the two materials. (P≤ 0.05), the subgroups of CEREC Tessera™, 
recorded, higher significant difference than Enamic in the two preparations. The results 
of the statistical tests demonstrated that the relationship between the preparation 
designs and materials, found to have a substantial impact on the fracture resistance 
difference. Conclusions: CEREC Tessera had a fracture resistance that gave better 
values, qualitatively and quantitatively.

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