The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

AN EVALUATION OF THE PRIMARY IMPLANT STABILITY AND THE IMMEDIATE LOAD-BEARING CAPACITY ACCORDING TO THE CHANGE OF CORTICAL BONE THICKNESS

치밀골 두께 변화에 따른 임플랜트 1차안정성과 즉시하중부담능 평가

  • Yi Yang-Jin (Dept. of Prosthodontics, College of Dentistry, Kangnung National University, and Research Institute of Oral Science) ;
  • Park Chan-Jin (Dept. of Prosthodontics, College of Dentistry, Kangnung National University, and Research Institute of Oral Science) ;
  • Cho Lee-Ra (Dept. of Prosthodontics, College of Dentistry, Kangnung National University, and Research Institute of Oral Science)
  • 이양진 (강릉대학교 치과대학 치과보철학교실) ;
  • 박찬진 (강릉대학교 치과대학 치과보철학교실) ;
  • 조리라 (강릉대학교 치과대학 치과보철학교실)
  • Published : 2005.04.01
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Abstract

Statement of problem. Cortical bone plays an important role in the primary implant stability, which is essential to immediate/early loading. However, immediate load-bearing capacity and primary implant stability according to the change of the cortical bone thickness have not been reported. Purpose. The objectives of this study were (1) to measure the immediate load-bearing capacity of implant and primary implant stability according to the change of cortical bone thickness, and (2) to evaluate the correlation between them. Material and methods.48, screw-shaped implants (3.75 mm$\times$7 mm) were placed into bovine rib bone blocks with different upper cortical bone thickness (0-2.5 mm) and resonance frequency (RF) values were measured subsequently. After fastening of healing abutment. implants were subjected to a compressive load until tolerated micromotion threshold known for the osseointegration and load values at threshold were recorded. Thereafter, RF measurement after loading, CT taking and image analysis were performed serially to evaluate the cortical bone quality and quantity. Immediate load-bearing capacity and RF values were analyzed statistically with ANOVA and post-hoc method at 95% confidence level (P<0.05). Regression analysis and correlation test were also performed. Results. Existence and increase of cortical bone thickness increased the immediate load-bearing capacity and RF value (P<0.05) With the result of regression analysis, all parameter's of cortical bone thickness to immediate load-bearing capacity and resonance frequency showed significant positive values (P<0.0001). A significant high correlation was observed between the cortical bone thickness and immediate load-beating capacity (r=0.706, P<0.0001), between the cortical bone thickness and resonance frequency (r=0.753, P<0.0001) and between the immediate load-bearing capacity and resonance frequency (r=0.755, P<0.0001). Conclusion. In summary, cortical bone thickness change affected the immediate load-baring capacity and the RF value. Although RF analysis (RFA) is based on the measurement of implant/bone interfacial stiffness, when the implant is inserted stably, RFA is also considered to reflect implant/bone interfacial strength of immediately after placement from high correlation with the immediate load-baring capacity. RFA and measuring the cortical bone thickness with X-ray before and during surgery could be an effective diagnosis tool for the success of immediate loading of implant.

Keywords

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