Torsional strength of computer-aided design/computer-aided manufacturing–fabricated esthetic orthodontic brackets
| Autor: | Najla Alrejaye, R. L. Pober, Russell A. Giordano |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Dental Stress Analysis
Ceramics Materials science Orthodontic Brackets Surface Properties Dentistry Orthodontics Esthetics Dental computer.software_genre Composite Resins 03 medical and health sciences 0302 clinical medicine Orthodontic Appliances CEREC Tensile Strength Materials Testing Aluminum Oxide Orthodontic Wires Humans Orthodontic Appliance Design Computer Aided Design 030212 general & internal medicine Manufacturing technology business.industry Torsional strength Bracket Torsion (mechanics) Original Articles 030206 dentistry Stainless Steel Dental Porcelain Elasticity Orthodontic brackets Torque Computer-aided manufacturing Microscopy Electron Scanning Computer-Aided Design Equipment Failure Stress Mechanical Zirconium business computer Dental Alloys |
| Zdroj: | Angle Orthod |
| ISSN: | 1945-7103 0003-3219 |
| DOI: | 10.2319/040416-267.1 |
| Popis: | Objective: To fabricate orthodontic brackets from esthetic materials and determine their fracture resistance during archwire torsion.Materials and Methods: Computer-aided design/computer-aided manufacturing technology (Cerec inLab, Sirona) was used to mill brackets with a 0.018 × 0.025-inch slot. Materials used were Paradigm MZ100 and Lava Ultimate resin composite (3M ESPE), Mark II feldspathic porcelain (Vita Zahnfabrik), and In-Ceram YZ zirconia (Vita Zahnfabrik). Ten brackets of each material were subjected to torque by a 0.018 × 0.025-inch stainless steel archwire (G&H) using a specially designed apparatus. The average moments and degrees of torsion necessary to fracture the brackets were determined and compared with those of commercially available alumina brackets, Mystique MB (Dentsply GAC).Results: The YZ brackets were statistically significantly stronger than any other tested material in their resistance to torsion (P < .05). The mean torques at failure ranged from 3467 g.mm for Mark II to 11,902 g.mm for YZ. The mean torsion angles at failure ranged from 15.3° to 40.9°.Conclusion: Zirconia had the highest torsional strength among the tested esthetic brackets. Resistance of MZ100 and Lava Ultimate composite resin brackets to archwire torsion was comparable to commercially available alumina ceramic brackets. |
| Databáze: | OpenAIRE |
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