Color stability of emax CAD laminate Veneers cemented with light cure versus dual cure amine free adhesive resin cement (Randomized Controlled Clinical Trial)

Abstract

Statement of the problem The increased thickness of ceramic laminate veneer with butt joint design at the incisal edge reduce the amount of light reaching the cement layer and therefore compromise photo-activation of the luting material However, an adequate cure of the resin-based cement is an important prerequisite for the stability and biocompatibility of the restoration. 57 Dual-cure resin-based cements have been recommended for luting ceramic laminate veneers to compensate for the attenuation of the curing light effected by the thickness of restoration and to allow complete polymerization of the luting material even at the incisal area of laminate veneers where access for the curing light is limited, but the yellowish discoloration due to ageing of conventional dual-cure resin based cement was the problem. Purpose : The aim of this study was to evaluate color stability of e-max CAD veneers cemented with light cure and dual cure amine free adhesive resin cement (Base line), (After 2 months), (After 4 months), (After 6 months),(After 8 m) Materials and methods: A total of 22 ceramic laminate veneers restorations(11 e.max cad cemented with light cure adhesive resin cement and 11 e.maxcad cemented with dual cure adhesive resin cement) were included in the study and completed by one operator (the researcher) who followed a meticulous clinical procedure and the ceramic laminate veneers were fabricated by one experienced dental technician. The operator followed the five phases of laminate veneers fabrication: diagnosis, preparation design, provisionalization , construction of the material and bonding ,Follow up sessions were done every two month for each patient using operator vision to evaluated change in color and then confirmed with easyshade in the baseline, 24 hours post cementation and in the postoperative follow-up according to the modified USPHS (United States Public Health Service) criteria. This was performed by an experienced, blinded investigator. Data were recorded, tabulated , and statistically analyzed using the Chi-square test and the significance level was set at P ≤ 0.05. Results: There was no statistically significant difference between (Group I) and (Group II) where (p=1) as both groups showed (100%) Alpha in all time periods. Conclusion: Both E.max CAD laminate veneers cemented with light cure and E.max CAD laminate veneers cemented with dual cure amine free adhesive resin cement revealed high successful survival rate in terms of the stability of the color.