Pilot study of the effects of three bonding systems on the torsional resistance of a titanium-reinforced composite core
| Autor: | Allan S. Deutsch, Brett I. Cohen, Gary Cofrancesco, Barry Lee Musikant, Mark K. Pagnillo |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Dental Stress Analysis
Materials science Composite number Pilot Projects Core (manufacturing) Composite Resins Materials Testing Humans Statistical analysis Composite material Acrylic resin Titanium Analysis of Variance business.industry Structural engineering Resin Cements Torsional Forces Torque Dentin-Bonding Agents visual_art visual_art.visual_art_medium Methacrylates Oral Surgery business Post and Core Technique A titanium |
| Zdroj: | The Journal of Prosthetic Dentistry. 82:277-280 |
| ISSN: | 0022-3913 |
| DOI: | 10.1016/s0022-3913(99)70080-6 |
| Popis: | There are no studies analyzing the effects of a bonding agent on torsional resistance for a titanium-reinforced core material bonded with a multistep bonding system.This pilot study investigated the effects of multistep bonding agents on torsional resistance of a titanium-reinforced composite core material (Ti-Core core material).A total of 40 recently extracted human molars with their crowns removed were placed into acrylic resin blocks and divided into 4 groups of 10 specimens. Only multistep bonding systems were used (AllBond-2, ScotchBond Multi-Tenure AB, and the control without bonding agent). Specimens were prepared according to manufacturer's instructions. The control group was etched with a 37.5% phosphate acid. All cores were fabricated with Ti-Core titanium core material with No. 1 hard copper bands as the matrix. Ti-Core core material was applied and allowed to cure for 1 hour, then the cores were placed in 100% humidity (water) for 1 week. Test specimens were placed in a special jig and a clockwise torsional force applied. Torsional force was measured on a Lebow 1102-200 torque transducer and recorded on a Hewlett Packard 7015B X-Y recorder in inch x ounce then converted into Newton-meter. One-way analysis of variance (ANOVA) was used to test for statistical significance (P.05).Torsional values (Newton-meter) were AllBond-2, 0.1980, ScotchBond Multi-0.1890, Tenure AB, 0.2142; the control group recorded a value of zero. Statistical analysis revealed that bonding systems did not differ from one another.Use of a bonding agent increased the core's resistance to torsional forces. Lack of a bonding agent dramatically reduced the resistance to torque. |
| Databáze: | OpenAIRE |
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