Double Bond Conversion in Preheated Composite vs Self-adhesive Resin Cement Under Varying Thicknesses Of Lithium Disilicate Occlusion Veneer : An In-Vitro Study

Description :

The purpose of this study is to assess in vitro the impact of the thickness of lithium disilicate restorations on the degree of conversion of two luting cements: a self-adhesive resin cement (Bifix SE®, VOCO, Dual-cured, universal, self-adhesive resin cement) and a preheated composite resin (VisCalor Bulk ®, VOCO, Highly-filled Thermo-viscous Bulk-fill Composite). Sixty freshly extracted upper and lower molars will be decontaminated and stored properly until usage. Teeth will be randomly divided into six groups of n=10 each and cut horizontally until dentine exposure. Sixty lithium disilicate discs with various thicknesses (a=2 mm, b=4 mm, c=6 mm) are going to be fabricated respectively for each tooth. The restorations are going to be prepared with hydrofluoric acid and silane. Half of the restorations are going to be cemented with self-adhesive resin cement and light cured with recommended light intensity using a LED curing pen. The other half is going to be cemented with preheated composite, respecting the same cement thickness and curing conditions as for the first half, and after tooth preparation with phosphoric acid and a bonding agent. Afterwards, a microtome will help remove the dentine from the luting cement applied. The degree of conversion will be quantified using a Raman-ATR spectroscopy machine to analyze the differences among groups, revealing any significant variations across different thicknesses for the same luting agent, as well as the distinctions for different luting agents at identical thicknesses.

Titulaire :
KASSIS (EL) KHOURY (EL) Cynthia

Contact USJ :
cynthia.kassis@usj.edu.lb

Chercheur(s) :
Dr CYNTHIA KASSIS

Projet présenté au CR, le : 07/01/2025

Projet achevé auprès du CR : 07/01/2026