Marginal gap and internal fit of lithium disilicate Inlay, Onlay and Endocrown restorations for endodontically treated maxillary premolars: An in vitro study | ||||
| Egyptian Dental Journal | ||||
| Volume 71, Issue 3 - Serial Number 4, July 2025, Page 2491-2500 PDF (676.12 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2025.388213.3493 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Norhan Naief Abd ElHaliem 1; Maha Nasr  2
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| 1Assistant Professor, Fixed Prosthodontic Department, Faculty of Oral and Dental Medicine, Egyptian Russian University, Cairo, Egypt | ||||
| 2Assistant Professor, Department of Endodontics, Faculty of Oral and Dental Medicine, Egyptian Russian University, Badr City, Cairo, Egypt | ||||
| Abstract | ||||
| Aim: assessing the interna fit and marginal gap distance of inlays, onlays, and endocrowns as final restorations for maxillary premolars that have had endodontic treatment. Methods: In this investigation, 33 maxillary premolars were used. For the endodontic treatment, access cavities were made with #2 round burs and tapered stones. Using gutta-percha and a modified single-cone approach, all canals were obturated after being prepared to size 35 with a 4% taper. Based on the cavity design preparation, the teeth were then randomized into three groups (n = 11 per group): Group A was prepared for endocrowns, Group B was prepared for onlays, and Group C was prepared for inlays. The restorations were fabricated using an IPS e.max Press . After thermocycling, the replica technique was used to evaluate the internal and marginal fits of the restorations. Data was analyzed for normality, and statistical evaluation was conducted using ANOVA followed by Tukey Results: Onlays had the smallest marginal gap both before and after thermocycling, whereas endocrowns had the smallest gap following cementation. All three groups did, however, show slight variations within clinically acceptable ranges. When it came to internal discrepancy, the onlay group had the highest value (186.6 ± 26.4), followed by the inlay group (143.21 ± 14.19), and the endocrown group (103.65 ± 13.73). A statistically significant difference between the groups was found (P < 0.05). Conclusion: Endocrown restorations outperformed inlay and onlay restorations in terms of internal fit and marginal gap, under the constraints of this investigation. | ||||
| Keywords | ||||
| Marginal gap; Internal fit; Endocrown; Inlay; Onlay | ||||
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