The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

THE EFFECT OF SCREW TIGHTENING SEQUENCE AND TIGHTENING METHOD ON THE DETORQUE VALUE IN IMPLANT-SUPPORTED SUPERSTRUCTURE

임플랜트 지지 상부구조물에서 나사조임순서와 조임방법이 풀림토크값에 미치는 영향

  • Choi, Jung-Han (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Kim, Chang-Whe (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Lim, Young-Jun (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Kim, Myung-Joo (Department of Prosthodontics, College of Dentistry, Seoul National University) ;
  • Lee, Seok-Hyung (Department of Prosthodontics, Samsung Medical Center, Sungkyunkwan University School of Medicine)
  • 최정한 (서울대학교 치과대학 치과보철학교실) ;
  • 김창회 (서울대학교 치과대학 치과보철학교실) ;
  • 임영준 (서울대학교 치과대학 치과보철학교실) ;
  • 김명주 (서울대학교 치과대학 치과보철학교실) ;
  • 이석형 (성균관대학교 의과대학 치과학교실)
  • Published : 2007.10.31
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Abstract

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 well-fitting 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.

Keywords

References

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