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학제간연구 과학기술학 뇌인지과학 기술정책 기타 복합학

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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
대한치과보철학회 대한치과보철학회지 대한치과보철학회지 제46권 제6호
발행연도
2008.1
수록면
561 - 568 (8page)

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STATEMENT OF PROBLEM: Currently, many implant systems are developed and divided into two types according to their joint connection: external or internal connection. Regardless of the connection type, screw loosening is the biggest problem in implant-supported restoration. PURPOSE: The purpose of this study is to assess the difference in stability of abutment screws between the external and internal hexagonal connection types under cyclic loading. MATERIAL AND METHODS: Each of the 15 samples of external implants and internal abutments were tightened to 30 N/cm with a digital torque gauge, and cemented with a hemispherical metal cap. Each unit was then mounted in a 30�.inclined jig. Then each group was divided into 2 sub-groups based on different periods of cyclic loading with the loading machine (30 N/ cm - 300 N/cm,14 Hz: first group 1 × 106, 5 × 106 cyclic loading; second group 3 × 106, 3 × 106 for a total cyclic loading of 6 × 106) The removal torque value of the screw before and after cyclic loading was checked. SPSS statistical software for Windows was used for statistical analysis. Group means were calculated and compared by ANOVA, independent t-test, and paired t-test with α = 0.05. RESULTS: In the external hexagonal connection, the difference between the removal torque value of the abutment screw before loading, the value after 1 × 106 cyclic loading, and the value after 1 × 106, and additional 5 × 106 cyclic loading was not significant. The difference between the removal torque value after 3 × 106 cyclic loading and after 3 × 106, and additional 3 × 106 cyclic loading was not significant. In the internal hexagonal connection, the difference between the removal torque value before loading and the value after 1 × 106 cyclic loading was not significant, but the value after 1 × 106, and additional 5 × 106 cyclic loading was reduced and the difference was significant (P < .05). In addition, in the internal hexagonal connection, the difference between the removal torque value after 3 × 106 cyclic loading and the value after 3 × 106, and additional 3 × 106 cyclic loading was not significant. CONCLUSION: The external hexagonalconnection was more stable than the internal hexagonal connection after 1 × 106, and additional 5 × 106 cyclic loading (t = 10.834, P < .001). There was no significant difference between the two systems after 3 × 106, and additional 3 × 106 cycles.
#Screw loosening #External hexagonal connection #Internal hexagonal connection #Cyclic loading

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참고문헌 (23)

참고문헌 신청
Adell R. / 1981 / A 15-year study of osseointegrated implants in the treatment of the edentulous jaw / Int J Oral Surg 10 : 387 ~ 416 google schola Bahat O. / 1996 / Use of wide implants and double implants in the posterior jaw: a clinica google schola Binon PP. / 1996 / The effect of implant/abutment hexagonal misfit on screw joint stability / Int J Prosthodont 9 : 149 ~ 160 google schola Binon PP. / 2000 / The external hexagonal interface and screw-joint stability: a primer on threaded fasteners / Quintessence Dent Technol 23 : 91 ~ 105 google schola Branemark PI. / 1977 / Osseointegrated implants in the treatment of the edentulous jaw. Experience from a 10-year period / Scand J Plast Reconstr Surg Suppl 16 : 1 ~ 132 google schola

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