Post fatigue fracture resistance of lithium disilicate and zirconia crowns: vertical versus horizontal preparations (an in vitro study).

ABSTRACT: To assess and compare the post-fatigue fracture resistance of two types of ceramic crowns, zirconia and lithium-disilicate, when used with two margin designs (vertical and horizontal). Forty sound human premolar teeth collected from the orthodontic department were divided randomly into two main groups according to the type of ceramic material (n = 20): Group A: Lithium-disilicate and Group B: Monolithic zirconia. Each group was further subdivided according to the margin design into two subgroups (n = 10): feather-edge (1) and shoulder (2) preparation designs. After digital scanning and designing, the crowns were bonded with self-adhesive resin cement. Each assembly underwent cyclic loading (1,000,000 cycles; 100 N; 1 Hz) in water and was then subjected to axial compressive loading till fra

SUBMITTER: Al-Obaidi MYN 

PROVIDER: S-EPMC12528514 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature