Influence of Different Vonlay Preparation Designs on Fracture Resistance

Abstract

Objectives: This research aimed to evaluate the influence of different vonlay preparation designs on fracture resistance in comparison with full coverage ceramic crown (as a control group) Methods: Thirty fresh extracted upper four teeth were collected from the orthodontic clinic in Minia and Nahda university. Teeth were divided according to the design of vonlay preparation into three groups. In Group (A); the control group the teeth were prepared to receive full coverage lithium-disilicate crowns (n=10), Group (B); teeth were prepared to receive bonded partial restoration (vonlay) involving functional cusp (n=10), and Group (C); teeth were prepared to receive bonded partial restoration (vonlay) without involving functional cusp (n=10). Then, by using a universal testing machine, samples were loaded along the long axis of the teeth until they fractured, and the maximum breaking load was recorded, as well as fracture patterns were noted. All samples were exposed to thermo-mechanical aging before testing.Results: preparation design of vonlay influences the fracture resistance of restoration.

Contributions of Fixed Prosthodontics Dept., Minia University in Dental Literature in Two Decades. (2003-2022)

“…Authors recommended the use of more conservative preparation in case of normal occlusal forces & to shift toward more coverage restorations in case of abnormal heavy occlusal forces [62].…”