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Fracture Load of Ultra-Thin Occlusal Veneer

Essam Nassef

Sixty molars were divided into 2 main groups (n=30) and
prepared according to thickness of occlusal veneers either 0.5
mm or 1 mm. Veneers were fabricated using CAD-CAM system
from lithium disilicate glass ceramic (e.max CAD, Ivoclar
Vivadent). Veneers were divided into 3 subgroups (n=10)
according to surface conditioning, HF acid plus universal primer
(Mononbond N) (HF), Self-etching primer (Mononbond Etch &
prime), (EP) and acidulated phosphate fluoride (APF) plus
universal primer (Mononbond N). Adhesive resin cement
(Multilinik Automix) was used for bonding. Six test groups were
resulted, HF 1mm, HF 0.5mm / EP 1mm, EP 0.5mm, APF
1mm and APF 0.5mm. Specimens were stored in water bath for
75 days and subjected to cyclic loaded. Fracture load in (N) was
recorded for each specimen using a universal testing machine.
Statistical analyses were conducted with 2 and 1-way ANOVAs
and Post Hoc Turkey’ (HSD) test.