Publications

Objective: To evaluate an innovative approach, Crown Margin Shifting (CMS), for its ability to re-establish the biological width (BW) or supracrestal tissue attachment. Clinical considerations: Seven patients aged between 25-45 years old, presented with bilateral maxillary premolars with deep interproximal caries violating the BW were recruited for this study. Both study sites received monolithic zirconia crowns with heavy chamfer finish line. The heavy chamfer is thicker and with bevel on the deepest part of experiment site. Clinical parameters were evaluated at baseline, 6 and 12 months after. Radiographic evaluation using CBCT was done to measure marginal bone loss (MBL) and the established BW at the deep proximal finish line. Results revealed significant improvement in Modified Plaque Index (MBI) and Gingival Index (GI) parameters in both sites at the end of the study. The Periodontal Probing Depth (PPD) increased significantly in the first 6 months only for both. The marginal bone loss (MBL) was present in control site throughout the 12 months, whereas in CMS site, it took place only in the first 6 months. Conclusions: The results support that CMS approach had less radiographic marginal bone loss without a negative influence on the clinical parameters up to one year follow-up. KEYWORDS: Biologic width; CAD/CAM monolithic zirconia; Crown lengthening; subgingival crown margin