FINITE ELEMENT ANALYSIS OF CYLINDER TYPE IMPLANT PLACED INTO REGENERATED BONE WITH TYPE IV BONE QUALITY

IV형의 골질로 재생된 골내에 식립된 원통형 임플란트의 유한요소법적 연구

  • Kim, Byung-Ock (Dept. of Periodontics, College of Dentistry, Oral Biology Research Institute, Chosun University) ;
  • Hong, Kug-Sun (Dept. of Periodontics, College of Dentistry, Oral Biology Research Institute, Chosun University) ;
  • Kim, Su-Gwan (Dept. of Oral & Maxillofacial Surgery, College of Dentistry, Oral Biology Research Institute, Chosun University)
  • 김병옥 (조선대학교 치과대학 치주과학교실, 조선대학교 치과대학 구강생물학연구소) ;
  • 홍국선 (조선대학교 치과대학 치주과학교실, 조선대학교 치과대학 구강생물학연구소) ;
  • 김수관 (조선대학교 치과대학 구강악안면외과, 조선대학교 치과대학 구강생물학연구소)
  • Published : 2004.08.31

Abstract

Stress transfer to the surrounding tissues is one of the factors involved in the design of dental implants. Unfortunately, insufficient data are available for stress transfer within the regenerated bone surrounding dental implants. The purpose of this study was to investigate the concentration of stresses within the regenerated bone surrounding the implant using three-dimensional finite element stress analysis method. Stress magnitude and contours within the regenerated bone were calculated. The $3.75{\times}10-mm$ implant (3i, USA) was used for this study and was assumed to be 100% osseointegrated, and was placed in mandibular bone and restored with a cast gold crown. Using ANSYS software revision 6.0, a program was written to generate a model simulating a cylindrical block section of the mandible 20 mm in height and 10 mm in diameter. The present study used a fine grid model incorporating elements between 165,148 and 253,604 and nodal points between 31,616 and 48,877. This study was simulated loads of 200N at the central fossa (A), at the outside point of the central fossa with resin filling into screw hole (B), and at the buccal cusp (C), in a vertical and $30^{\circ}$ lateral loading, respectively. The results were as follows; 1. In case the regenerated bone (bone quality type IV) was surrounded by bone quality type I and II, stresses were increased from loading point A to C in vertical loading. And stresses according to the depth of regenerated bone were distributed along the implant evenly in loading point A, concentrated on the top of the cylindrical collar loading point B and C in vertical loading. And, In case the regenerated bone (bone quality type IV) was surrounded by bone quality type III, stresses were increase from loading point A to C in vertical loading. And stresses according to the depth of regenerated bone were distributed along the implant evenly in loading point A, B and C in vertical loading. 2. In case the regenerated bone (bone quality type IV) was surrounded by bone quality type I and II, stresses were decreased from loading point A to C in lateral loading. Stresses according to the depth of regenerated bone were concentrated on the top of the cylindrical collar in loading point A and B, distributed along the implant evenly in loading point C in lateral loading. And, In case the regenerated bone (bone quality type IV) was surrounded by bone quality type III, stresses were decreased from loading point A to C in lateral loading. And stresses according to the depth of regenerated bone were distributed along the implant evenly in loading point A, B and C in lateral loading. In summary, these data indicate that both bone quality surrounding the regenerated bone adjacent to implant fixture and load direction applied on the prosthesis could influence concentration of stress within the regenerated bone surrounding the cylindrical type implant fixture.

Keywords

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