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STATEMENT OF PROBLEM: The screw detorque value is a measure of the preload remaining in the screw just before detorquing. PURPOSE: This study evaluated the effect of different screw tightening sequences and tightening methods on detorque values for a well-fitting implant superstructure. MATERIAL AND METHOD: An implant superstructure that connected directly to four implants (Astra Tech) was fabricated on a fully edentulous mandibular acrylic resin model. Six wellfitting dental stone casts were made with a pickup impression of the superstructure from the acrylic resin model. To evaluate the effect of three screw tightening sequences (1-2-3-4, 2-4-3-1, and 2-3-1-4) and two tightening methods (2-step and 1-step) on the stability of screw joint, the detorque values for a well-fitting implant superstructure were measured twice after screw tightening using 20 Ncm. Detorque values were analyzed using multi-way analysis of variance and two-way analysis of variance at a .05 level of significance. RESULTS: 1. The mean detorque values for three screw tightening sequences were 12.3 Ncm, 12.6 Ncm, and 12.0 Ncm, respectively. 2. The mean detorque values for two screw tightening methods were 12.0 Ncm, and 12.2 Ncm, respectively. 3. The mean of mimimum detorque values for three screw tightening sequences and for two tightening methods were 10.6 Ncm, 11.1 Ncm, 10.5 Ncm, and 9.8 Ncm, respectively. 4. No statistically significant differences among the variables of screw tightening sequence and tightening method were found (p>.05) for detorque values and for mimimum detorque values. CONCLUSION: Within the limitations of this study, the screw tightening sequence and tightening method did not have a significant effect on the detorque values for a well-fitting implant superstructure.
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No abstract available.
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PURPOSE: To review the statistical analysis used for the studies in the Journal of the Korean orthopaedic Association. MATERIALS AND METHODS: We analysed the statistical analysis used for the studies in the Journal of the Korean Orthopaedic Association (JKOA) published in 1997 and compared that with the Journal of Bone and Joint Surgery (JBJS). RESULTS: In JKOA, 97 out of 205 papers (47.3%) used statistical analysis. Total number of analytic methods was 140 (1.44 per paper in an average). In JBJS, 109 out of 159 papers (68.6%) used statistical analysis and total number of analytic methods was 202 (1.85 per paper in an average). In JKOA, analysis of means was used 98 times (70.0%), analysis of regression and correlation 8 times (5.7%), analysis of categorical data 30 times (21.4%), analysis of survival data 3 times (2.1%) and other methods just once (0.7%). In JBJS, analysis of means was used 114 times (56.4%), analysis of regression and correlation 10 times (5.0%), analysis of categorical data 55 times (27.2%), analysis of survival data 21 times (10.4%) and other methods 2 times (1.0%). CONCLUSIONS: In both journals, t-test, chisquare test and analysis of variance were commonly used analytic methods. In JKOA, the results of 10 out of 97 papers (10.3%) were difficult to understand because of insufficient explanation of the analytic methods used.
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No abstract available.
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