Effect of Preparation Depth on Marginal Adaptation of Anterior Teeth Restored by Endocrowns and Post Retained Crowns (In-Vitro study)

Document Type : Original Article

Authors

1 Assistant lecturer at Fixed Prosthodontics Department. Faculty of Oral and Dental Medicine. Nahda University, Beni-Sueif, Egypt.

2 Professor at Fixed Prosthodontics Department, Faculty of Dentistry. Minia University, Minia, Egypt.

3 Professor at Oral and Maxillofacial Radiology Department. Faculty of Dentistry, Minia University, Minia, Egypt.

Abstract

Aim: To compare marginal adaptation (MA) of IPS e.max computer-aided design(CAD) and press endocrowns with different preparation depths (2mm and 5mm) and crowns retained by post and core.
Material and Methods: Thirty-six intact maxillary central incisors were practiced. Teeth were categorized into two major groups (n=18) according to the Material fabrication methodology; I: CAD/CAM technique and, II: Pressing technique, the major groups were then subdivided into three subgroups (n=6): S1: crown held by post and core, S2: short endocrown with 2mm inter-radicular depth, and S3: long endocrown with 5mm inter-radicular depth. Restorations were cemented with resin cement and exposed to thermo-cyclic loading (5000 cycles), followed by MA evaluation. Data were gathered and subjected to statistical analysis utilizing a two-way ANOVA test.
Results: The results showed significantly larger marginal gap values in group I (IPS e.max CAD) compared to group II (IPS e.max Press), across all designs. Marginal gap values of different designs using CAD/CAM technique showed significant differences between designs, emerged(p=0.036), with S3(75.4±5) showing significantly larger marginal gap values than the other designs(S1: 65.5±7.7 and S2: 72.7±5.2). Marginal gap values of heat- pressing group showed statistically significant differences between different designs (p<0.001), with S3 consistently showed significantly larger marginal gaps values (54.5±5.6) than both S1 (42±2.7)and S2(45.1±3.1).
Conclusion: All groups showed clinically accepted MA results. Restorations fabricated by heat pressing technique showed a higher MA than those fabricated by CAD/CAM technique. Differences in preparation designs depths have a statistically significant impact on MA of restorations both before and after cementation.

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Egyptian Dental Journal
Volume 71, Issue 4 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
October 2025
Pages 3229-3240

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