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original article OA A comparative study on accuracy of the implant torque devices for screw tightening Hi-Chan Jung 1, Chang-Mo Jeong 2 1 Graduate student, DDS,MSD Dept of Prosthodontic Dentistry,

1 original article OA A comparative study on accuracy of the implant torque devices for screw tightening Hi-Chan Jung 1, Chang-Mo Jeong 2 1 Graduate student, DDS,MSD Dept of Prosthodontic Dentistry, College of Dentistry, Pusan National University 2 Professor, DDS,MSD,PhD, Dept of Prosthodontic Dentistry, College of Dentistry, Pusan National University Abstract This study evaluated the accuracy and the consistency of torque which were delivered from four mechanical torque devices and one electric torque device used routinely in our department. To measure the torque output of each torque device, torque device positioned in the jaws of torque gauge was and then target torque of 20Ncm was applied. The delivered torque was recorded thirty times for each device. Within the limits of this study design, the following conclusions can be made; 1. Torque output of each individual device deviated in varying ranges from target torque values. 2. The means of torque value delivered from five torque devices were within the deviation of 10% of the target torque values. 3. 3i Restorative torque indicator and Nobel Biocare Prosthetic manual torque wrench produced the most accurate and consistent torque values. 4. Osstem Torque wrench recorded the largest variations from target torque values. 5. The electric torque device was the only one which delivered the lower torque values than the target torque value. Key words : electric torque device, mechanical torque device, screw tightening. 2 Implantology

2 IMPLANTOLOGY Implantology 3

3 original article A B C D Fig. 1. A, Torque wrench(osstem implant) B, SAE precision torque wrench(sae dental Vertriebs GMBH) C, Restorative torque indicator(3i implant innovation) D, Prosthetic manual torque wrench(nobel Biocare AB) E, Torque controller(nobel Biocare AB) E Fig. 2. Torque wrench positioned in the jaws of the Torque Gauge. 4 Implantology

4 IMPLANTOLOGY Table. 1. Torque value(ncm) registrated by torque gauge and Duncan s multiple comparison Torque device Mean SD Duncan s grouping Torque wrench A SAE precision torque wrench B Restorative torque indicator C Prosthetic manual torque wrench C Torque controller D * The same letter denotes groups that were not significantly different from each other(p>0.05). Table. 2. Maximum and Minimum torque value(ncm) for torque device Torque device Maximum Minimum Torque wrench SAE precision torque wrench Restorative torque indicator Prosthetic manual torque wrench Torque controller Implantology 5

5 original article 6 Implantology

6 IMPLANTOLOGY 25 Mean torque(ncm) Torque wrench SAE precision torque wrench Restorative torque indicator Prosthetic manual torque wrench Torque controller Torque device Fig. 3. Graphic presentation of differences in mean torque value registrated by torque gauge Implantology 7

7 original article 8 Implantology

8 IMPLANTOLOGY 1. Naert I, Quirynen M, van Steenberghe D, Darius P. A stydy of 589 consecutive implants supporting complete fixed prostheses. Part II: prosthetic aspects. J Prosthet Dent 1992;68: Hemmings KW, Schmitt A, Zarb GA. Complications and maintenace requirements for fixed prostheses and overdentures in the edentulous mandible: a 5-year report. Int J Oral Maxillofac Implants 1994;9: Naert I, Quirynen M, Theuniers G, van Steenberghe D. Prosthetic aspects of osseointegrated fixtures supporting overdentures. A 4- year report. J Prosthet Dent 1991;65: Jemt T, Book K, Linden, Urde G. Failures and complications in 92 consecutively inserted overdentures supported by Brånemark implants in severely resorbed edentulous maxillae: a study from prosthetic treatment to first annual check-up. Int J Oral Maxillofac Implants 1992;7: Patterson EA, Johns RB. Theoretical analysis of the fatigue life of fixture screws in osseointegrated dental implants. Int J Oral Maxillofac Implants 1992;7: Misch CE. Principles for screw-retained prostheses. in: Misch CE. Contemporary implant dentistry. 2nd ed., Missouri: CV Mosby; pp Haack JE, Sakaguchi RL, Sun T, Coffey JP. Elongation and preload stress in dental implant abutment screws. Int J Oral Maxillofac Implants 1995;10: Rodkey E. Making fastened joints reliable...ways to keep emtight. Assembly Eng 1977; Motash N. Development of design charts for bolts preloaded up to the plastic range. J Eng Ind 1976;98: Binon P, Sutter F, Beaty K, et al. The role of screws in implant systems. Int J Oral Maxillofac Implants 1994;9(suppl); McGlumphy EA, Mendel DA, Holloway JA. Implant screw mechanics. Dent Clin North Am 1988;42: Gross M, Kozak D, Laufer BZ, Weiss EI. Manual closing torque in five implant abutment systems: An in vitro comparative study. J Prosthet Dent 1999;81: Dellinges MA, Tebrock OC. A measurement of torque values obtained with hand-held drivers in a simulated clinical setting. J Prosthodont 1993;2: Implantology 9

9 original article 14. Goheen KL, Vermilyea SG, Vossoughi J, Agar JR. Torque generated by hand-held screwdrivers and mechanical torquing devices for osseointegrated implants. Int J Oral Maxillofac Implants 1994;9: Edgrens S. The right torque for the right job. Nobelpharma News 1992;1: Gutierrez J, Nicholls JI, Libman WJ, Butson TJ. Accuracy of the implant torque wrench following time in clinical service. Int J Prosthodont 1997;17: Dellinges M, Curtis D. Effects of infection control procedures on the accuracy of a mechanical torque wrench system for implant restorations. J Prosthet Dent 1996;75: Standlee JP, Caputo AA. Accuracy of an electric torque-limiting device for implants. Int J Oral Maxillofac Implants 1999;14: Wicks RA, derijk WG, Windeler AS. An evaluation of fit in osseointegrated Implant components using torque/turn analysis. J Prosthodont 1994;3: Jaarda M, Razzoog M, Gratton D. Providing optimum torque to implant prosthesis:a pilot study. Implant Dent 1993;2: Tan KB, Nicholls JI. The effect of 3 torque delivery systems on gold screw preload at the gold cylinder-abutment screw joint. Int J Oral Maxillofac Implants 2002;17: Mitrani R, Nicholls JI, Philips KM. Ma T. Accuracy of electronic implant torque controllers following time in clinical service. Int J Oral Maxillofac Implants 2001;16: Implantology

00)13-3목차1~3

00)13-3목차1~3 An evaluation of marginal bone level change in single short implant : an 1-year follow up Tae-Hoon Lee, Joo-Hyun Kwon, Sunjai Kim, Chong-Hyun Han Department of Prosthodontics, Kangnam Severance hospital,