Clinical Performance of Two CAD/CAM Fabricated Ceramic Restorations with Different Designs for MIH Rehabilitation: A Randomized Controlled Trial

Background:Molars affected with severe molar incisor hypomineralisation (MIH) require extensive restorations, which do not last for a long time and often require treatment in the form of onlays or full coverage restorations.Objective:A randomized clinical trial evaluated the clinical performance of two CAD/CAM fabricated ceramic restorations, Vita Suprinity (VS) and Vita Enamic (VE), with different preparation designs, occlusal veneer and endocrown, for rehabilitation of the first permanent molar affected by MIH.Materials and Methods:The study was registered with NCT05434884 clinical trial ID with 68 patients ranging from 8 to 13 years old, who attended the dental clinic of Al-Azhar University, Girls Branch, and suffering from a severe form of molar incisor hypomineralization. The patients were divided equally into two groups, group I, i.e., occlusal veneer (OV) group, and group II, i.e., endocrown (EN) group, according to different preparation designs related to different severity levels of first permanent molars' hypomineralization (moderate and severe); each group was subdivided equally and randomly into two subgroups, subgroup A, i.e., Vita Suprinity (VS), and subgroup B, i.e., Vita Enamic (VE), according to the material used for fabrication of the restoration. The survival and success rates of restorations were assessed using the clinical United States Public Health Service (USPHS) criteria at 1 week, and 3, 6, 12, and 18 months' recall times after cementation, and statistical analysis was performed.Results:There was no statistically significant difference between groups and subgroups in terms of all evaluation parameters during the whole observational period.Conclusion:Based on observations, occlusal veneer and endocrown designs fabricated from CAD/CAM VS and VE showed similar clinical success in the rehabilitation of first permanent molars with severe MIH over 18 months of evaluation.