Comparative evaluation of failure mode for lithium disilicate crowns with four different cementation systems- An In Vitro Study

Abstract

AIM OF THE STUDY: This in vitro study was performed to compare the failure mode of pressable lithium disilicate crowns cemented with four different cementation systems.
METHODS: A sample size of eighty single rooted maxillary 1st premolars, was taken for the study. Mounting and preparation and crown fabrication of the sample was standardized for each tooth. The samples were randomly divided into 4 groups according to different cementation systems. Each upper block was pulled along the path of insertion of the crown with a crosshead speed of 1mm/min. Failure mode was classified as decementation or fracture. Failure modes were compared using Pearson’s Chi-square test.
RESULTS: In samples luted with total etch resin cement (TE) and self adhesive resin cement (SA), fracture was found to be more common mode of failure in comparison to decementation. On the contrary, in self etch resin cement (SE) group, decementation was found to be more common mode of failure in comparison to fracture. Whereas, in glass ionomer cement (GIC) group there was equal percentage of fracture and decementation as a mode of failure in the samples.
CONCLUSION: Within the limitations of this in vitro study, self etch resin cement was found to be the cement of choice for luting lithium disilicate full coverage crowns.