Accuracy and precision of as-received implant torque wrenches
| Autor: | Darshanjit S. Pannu, Stephen W. Looney, Donald Mettenburg, Eduardo Britton-Vidal, Jimmy Londono, Frederick A. Rueggeberg, Philip S. Baker |
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| Rok vydání: | 2014 |
| Předmět: |
Dental Implants
Engineering Accuracy and precision business.industry Population mean Dental Implantation Endosseous Torque wrench Mechanical engineering Value (computer science) Equipment Design Confidence interval law.invention Torque law Statistics Range (statistics) Humans Oral Surgery Wrench business |
| Zdroj: | The Journal of Prosthetic Dentistry. 112:811-816 |
| ISSN: | 0022-3913 |
| DOI: | 10.1016/j.prosdent.2014.06.002 |
| Popis: | Statement of problem Previous implant torque evaluation did not determine if the target value fell within a confidence interval for the population mean of the test groups, disallowing determination of wheter a specific type of wrench met a standardized goal value. Purpose The purpose of this study was to measure both the accuracy and precision of 2 different configurations (spring style and peak break) of as-received implant torque wrenches and compare the measured values to manufacturer-stated values. Material and methods Ten wrenches from 4 manufacturers, representing a variety of torque-limiting mechanisms and specificity of use (with either a specific brand or universally with any brand of implant product). Drivers were placed into the wrench, and tightening torque was applied to reach predetermined values using a NIST-calibrated digital torque wrench. Five replications of measurement were made for each wrench and averaged to provide a single value from that instrument. The target torque value for each wrench brand was compared to the 95% confidence interval for the true population mean of measured values to see if it fell within the measured range. Results Only 1 wrench brand (Nobel Biocare) demonstrated the target torque value falling within the 95% confidence interval for the true population mean. For others, the targeted torque value fell above the 95% confidence interval (Straumann and Imtec) or below (Salvin Torq). Conclusions Neither type of torque-limiting mechanism nor designation of a wrench to be used as a dedicated brand-only product or to be used as a universal product on many brands affected the ability of a wrench to deliver torque values where the true population mean included the target torque level. |
| Databáze: | OpenAIRE |
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