Effect of Preparation Design on the Fracture Resistance of Partial Laminate Veneers. An In-vitro Study

Document Type : Original Article

Authors

Lecturer, Fixed Prosthodontics department, Faculty of Dentistry, Cairo University, Cairo, Egypt .

Abstract

Objectives. To evaluate the effect of two preparation designs of partial laminate veneers on the 
fracture resistance of anterior teeth with full and half incisal edge fracture.
Materials and Methods. 48 upper central incisors were divided into four equal groups: two 
groups simulated completely fractured incisal edge: Group (Full/Cham): with chamfer design and 
Group (Full/Bev): with bevel design and two groups simulated half fractured incisal edge: Group 
(Half/Cham): with chamfer design and Group (Half/Bev): with bevel design. Lithium disilicate 
partial veneers were constructed and cemented using light-curing resin cement. All samples were 
mounted on universal testing machine to test their fracture resistance. Fractured samples were 
categorized as restorable or non-restorable based on the crack/fracture extension relative to the 
cemento-enamel junction. 
Results. Group (Full/Cham): (361.05 ± 11.39 N) had significantly the highest fracture resistance, 
followed by Group (Full/Bev): (207.1 ± 10.85 N), while Group (Half/Cham): (123.16 ± 6.63 N) 
and Group (Half/Bev): (123.75 ± 6.12 N) had significantly the lowest values with insignificant 
difference between them. All teeth with half incisal edge fracture revealed restorable fractures, 
while with full incisal edge fracture the percentage dropped to third (33.3%).
Conclusions. In full incisal edge fractures, chamfer design had better fracture resistance than 
bevel design. While in half incisal edge fractures, both designs had similar fracture resistance and 
restorable mode of failure.
Clinical Relevance. The innovative chamfer and bevel designs of partial laminate veneers can 
be used as a highly conservative approach to restore anterior teeth with full or half fractured incisal 
edge

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Egyptian Dental Journal
Volume 70, Issue 3 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
July 2024
Pages 2659-2669

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