[논문]수종 임플랜트 지대주나사의 반복하중 후 나사풀림에 관한 연구

김진만; 한중석; 이선형; 양재호; 이재봉; 김영수

수종 임플랜트 지대주나사의 반복하중 후 나사풀림에 관한 연구
A STUDY OF SCREW LOOSENING AFTER DYNAMIC CONTINOUS FATIGUE TEST OF SEVERAL ABUTMENT SCREW 원문보기

대한치과보철학회지 = The journal of Korean academy of prosthodontics, v.41 no.4, 2003년, pp.519 - 531

김진만 (서울대학교 치과대학 치과보철학교실) , 한중석 (서울대학교 치과대학 치과보철학교실) , 이선형 (서울대학교 치과대학 치과보철학교실) , 양재호 (서울대학교 치과대학 치과보철학교실) , 이재봉 (서울대학교 치과대학 치과보철학교실) , 김영수 (서울대학교 치과대학 치과보철학교실)

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Statement of problem : Chronic implant screw loosening remains a problem in restorative practices. Some implant manufactureres have introduced abutment screws with treated material, surfaces and macrostructures in an effort to reduce potential loosening. Purpose : This study evaluated the materials and loading cycles on detorque value after dynamic continous fatigue test in the sinulated conditions of posterior single restoration. Material and method : Fourteen of each of the following abutment screws - titanium alloy, gold alloy, gold-tite, and titanium alloy modified - were used in test. SEM is used to verify macrostructures of each screws. $ZrO_2/Al_2O_3$ composite abutment was tightened on $4{\times}10.0mm$ titanium external implant at 30 Ncm. Cyclic loading machine delivered dynamic loading forces between 20 and 320N for 100,000, 200,000, 300,000, 500,000, and 1,000,000 cycles at frequencies 14Hz. Torque and detorque value after loading was measured. Results : All measued screws had different screw length and thread form. Titanium modified screw had greater detorque value than others before and after cyclic loadings(p<0.05). All abutment screws had no significant change in mean percentage of detorque value after loading to initial value after less than 500.000 cyclic loadings, but significant lower value after 1,000,000 cycles(p<0.05). Conclusion : Within limintations of this study all abutment screws may be loosend after about 1 year use. Annual check-up is nessasary to prevent screw loosening.

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참고문헌 (25)

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