Influence of reverse torque values in abutments with or without internal hexagon indexes
| Autor: | Daiane Cerutti-Kopplin, Dimas João Rodrigues Neto, Accácio Lins do Valle, Jefferson Ricardo Pereira |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Time Factors
Friction business.industry Significant difference Torque wrench Abutment Dental Abutments Dental Implant-Abutment Design Structural engineering Stainless Steel Biomechanical Phenomena Dental Prosthesis Retention Torque Mechanical stability Humans IMPLANTES DENTÁRIOS Stress Mechanical Oral Surgery business Morse taper Student's t-test Mathematics Dental Alloys |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Statement of problem The mechanical stability of the implant-abutment connection is of fundamental importance for successful implant-supported restorations. Therefore, understanding removal torque values is essential. Purpose The purpose of this study was to evaluate the reverse torque values of indexed and nonindexed abutments of the Morse Taper system. Material and methods Twelve Morse taper implants with their respective abutments were divided into 2 groups (n=6): group NI, nonindexed abutments; and group IN, indexed abutments. Each abutment received a sequence of 2 consecutive torques for insertion (15 Ncm) at an interval of 10 minutes, and 1 reverse torque, all measured with a digital torque wrench. The Student t test with a 5% significance level was used to evaluate the data. Results Statistical analysis showed no significant difference in reverse torque values between nonindexed and indexed abutments ( P =.57). When comparing insertion torque and reverse torque values between the groups, group NI presented a mean torque loosening percentage of 8% ( P =.013), whereas group IN presented a loosening of 15.33% ( P Conclusion The use of indexed abutments for the Morse taper system presented similar biomechanical stability when compared with nonindexed abutments, both with a significant reduction in reverse torque values. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|