von Stein-Lausnitz, Manja and Mehnert, Andre and Bruhnke, Maria and Sterzenbach, Guido and Rosentritt, Martin and Spies, Benedikt C. and Bitter, Kerstin and Naumann, Michael (2018) Direct or Indirect Restoration of Endodontically Treated Maxillary Central Incisors with Class III Defects? Composite vs Veneer or Crown Restoration. JOURNAL OF ADHESIVE DENTISTRY, 20 (6). pp. 519-526. ISSN 1461-5185, 1757-9988
Full text not available from this repository. (Request a copy)Abstract
Purpose: The aim of this ex-vivo study was to evaluate the load capacity of direct or indirect endodontically restored maxillary central incisors with Class III defects, with or without glass-fiber posts. Materials and Methods: Seventy-two extracted human maxillary central incisors were endodontically treated and bi-proximal Class Ill cavities were prepared. Specimens were randomly allocated to six groups (n = 12): direct restoration with composite (C); direct restoration with composite and additional glass-fiber post (CP); ceramic veneer restoration (V), ceramic veneer restoration and additional glass-fiber post (VP), ceramic crown restoration (Cr), ceramic crown restoration and additional glass-fiber post (CrP). Specimens were exposed to thermomechanical loading (TML: 1.2 million cycles, 1 to 50 N; 6000 thermal cycles between 5 degrees C and 55 degrees C for 1 min each), and subsequently linearly loaded until failure (F-max [N]) at an angle of 135 degrees 3 mm below the incisal edge on the palatal side. Statistical tests were performed using the Kruskall-Wallis and Mann-Whitney U-Test. Results: During dynamic loading by TML, one early failure occurred in group C, CP, and CrP. Subsequent linear loading resulted in mean fracture load values [N] of C = 483 +/- 219, CP = 536 +/- 281, V = 908 +/- 293, VP = 775 +/- 333, Cr = 549 +/- 258, CrP = 593 +/- 259. The Kruskal-Wallis test showed significant differences of load capacity between groups (p < 0.05). Mann-Whitney U-test revealed significantly lower maximum fracture load values of group C compared to group V (p = 0.014), after Bonferroni-Holm correction. Non-restorable root fracture was the most frequent type of failure. Conclusion: Endodontically treated maxillary central incisors with Class III defects directly restored with composite are as loadable as indirect crown restorations. Compared to full-coverage restorations, less invasive veneers appear to be more beneficial. Additional placement of glass-fiber posts shows no positive effect.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | IN-VITRO; FRACTURE-RESISTANCE; ANTERIOR TEETH; FIBER POSTS; SURVIVAL; LOAD; METAANALYSIS; PERFORMANCE; DEFLECTION; CAVITIES; all-ceramic crown; Class III restorations; direct composite restorations; endodontically treated teeth; indirect restoration; post and core; veneers |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Zahnärztliche Prothetik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 Oct 2019 07:05 |
| Last Modified: | 10 Oct 2019 07:05 |
| URI: | https://pred.uni-regensburg.de/id/eprint/13566 |
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