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논문 상세정보

Abstract

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.

참고문헌 (25)

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이 논문을 인용한 문헌 (6)

  1. Kim Jong-Hui ; Lim Ju-Hwan ; Cho In-Ho ; Lee Joon-Seok 2005. "A STUDY OF THE ANTI-ROTATING INNER POST SCREW SYSTEM AS A MEANS OF PREVENTING ABUTMENT SCREW LOOSENING" 대한치과보철학회지 = The journal of Korean academy of prosthodontics, 43(5): 671~683 
  2. Mun Yang-Suk ; Park Sang-Won ; Vang Mong-Sook ; Yang Hong-So ; Park Ha-Ok 2006. "THE INFLUENCE OF IMPLANT FIXTURE-ABUTMENT CONNECTION DESIGN ON SCREW LOOSENING" 대한치과보철학회지 = The journal of Korean academy of prosthodontics, 44(2): 174~184 
  3. Park, Won-Ju ; Cho, In-Ho 2009. "Fatigue fracture of different dental implant system under cyclic loading" 대한치과보철학회지 = The journal of Korean academy of prosthodontics, 47(4): 424~434 
  4. Lee, Ju-Ri ; Lee, Dong-Hwan ; Hwang, Jae-Woong ; Choi, Jung-Han 2010. "Detorque values of abutment screws in a multiple implant-supported prosthesis" 대한치과보철학회지 = The journal of Korean academy of prosthodontics, 48(4): 280~286 
  5. Lee, Ju-Ri ; Lee, Dong-Hwan ; Hwang, Jae-Woong ; Choi, Jung-Han 2010. "Detorque Values of Various Compatible Dental Implant Screws" 구강회복응용과학지 = Journal of dental rehabilitation and applied science, 26(3): 273~283 
  6. Huh, Yoon-Hyuk ; Cho, Lee-Ra ; Kim, Dae-Gon ; Park, Chan-Jin 2010. "Comparison of Implant Torque Controllers using Detorque Value" 구강회복응용과학지 = Journal of dental rehabilitation and applied science, 26(4): 419~432 

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