Marginal Accuracy and Periodontal Tolerance of Three Different Types of Mock Ups Compared with the Final Restoration in Anterior Esthetic Region

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1 Assistant lecturer at Fixed Prosthodontics department- Misr University for Science & Technology

2 Professor& Head of Crowns and Bridges department Faculty of Dental Medicine for Girls Al-Azhar University

3 professor of Crowns and Bridges Faculty of Oral and Dental Medicine and Surgery Modern University for Technology and Information

Abstract

purpose: This clinical study evaluated the marginal accuracy and periodontal tolerance of three different types of mock-ups (conventionally constructed, milled using CAD/CAM, and mock-up on three-dimensional printed cast) compared with the final restoration in the anterior esthetic region. Patients and Methods: A total of 30 patients with esthetic dental defects were enrolled and divided into two equal groups based on clinical presentation: Group (1) included cases with color or texture defects, while Group (2) involved defects in size, spacing, or alignment. Each group was further subdivided into three subgroups according to the mock-up fabrication technique: Subgroup (A) employed conventional methods, Subgroup (B) utilized computer-aided design/computer-aided manufacturing (CAD/CAM) milling, and Subgroup (C) involved mock-ups on three-dimensional (3D) printed cast. Accuracy was evaluated by scanning the constructed mock-ups with a laboratory scanner and saving them as STL files. The final restorations were milled, scanned, and saved as separate STL files. The mock-up and restoration files were co-registered, segmented, and superimposed to assess dimensional discrepancies. The mock-ups were also placed in the patient's mouth, and periodontal conditions were evaluated at baseline and after two weeks. Results were then compared with the periodontal condition at baseline and two weeks post-cementation of the final restorations. Results: The analysis revealed statistically significant differences in marginal accuracy, while there was an insignificant difference in periodontal tolerance between different groups. Conclusion: Methods of mock-up construction significantly affect marginal accuracy compared to the final restoration, but the fabrication techniques have no impact on the periodontal condition.

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