J Adv Prosthodont.  2019 Dec;11(6):341-349. 10.4047/jap.2019.11.6.341.

Effects of cementless fixation of implant prosthesis: A finite element study

Affiliations
  • 1Department of Prosthodontics, School of Dentistry, Pusan National University, Yangsan, Republic of Korea.
  • 2School of Mechanical Engineering, Kyungpook National University, Daegu, Republic of Korea. gunwoo@knu.ac.kr
  • 3Department of Prosthodontics, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea.

Abstract

PURPOSE
A novel retentive type of implant prosthesis that does not require the use of cement or screw holes has been introduced; however, there are few reports examining the biomechanical aspects of this novel implant. This study aimed to evaluate the biomechanical features of cementless fixation (CLF) implant prostheses.
MATERIALS AND METHODS
The test groups of three variations of CLF implant prostheses and a control group of conventional cement-retained (CR) prosthesis were designed three-dimensionally for finite element analysis. The test groups were divided according to the abutment shape and the relining strategy on the inner surface of the implant crown as follows; resin-air hole-full (RAF), resin-air hole (RA), and resin-no air hole (RNA). The von Mises stress and principal stress were used to evaluate the stress values and distributions of the implant components. Contact open values were calculated to analyze the gap formation of the contact surfaces at the abutment-resin and abutment-implant interfaces. The micro-strain values were evaluated for the surrounding bone.
RESULTS
Values reflecting the maximum stress on the abutment were as follows (in MPa): RAF, 25.6; RA, 23.4; RNA, 20.0; and CR, 15.8. The value of gap formation was measured from 0.88 to 1.19 µm at the abutmentresin interface and 24.4 to 24.7 µm at the abutment-implant interface. The strain distribution was similar in all cases.
CONCLUSION
CLF had no disadvantages in terms of the biomechanical features compared with conventional CR implant prosthesis and could be successfully applied for implant prosthesis.

Keyword

Finite element analysis; Implant prosthesis; Cementless fixation

MeSH Terms

Crowns
Finite Element Analysis
Prostheses and Implants*
RNA
RNA

Figure

  • Fig. 1 Three-dimensional finite element models. Structure of the implant complex and cross-sectional view of the cylindrical bone near the implant (A). The dimensions of three cases of cementless fixation (CLF) implant prosthesis (RAF, RA, and RNA) and cement-retained (CR) implant prosthesis (B). In each system, the magnified part shows the finite element models of thin resin/cement layer and the represented thickness.

  • Fig. 2 Boundary conditions and load conditions of the finite element model. Both ends of the bone block are fixed in all directions and a total force of 200 N is applied to each of the 60 nodes on the three cusps in a vertical direction. The preload on the screw to achieve a tightening torque of 32 N·cm is represented by red arrows.

  • Fig. 3 The interface between the abutment and resin/cement layer (Contact 1) and between the abutment and the implant (Contact 2). For the cement layer of the cement-retained case, the interface condition with the abutment is set to the bonded condition (same as the “tie” condition).

  • Fig. 4 The von-Mises stress distribution at the Contact 1 and Contact 2 surfaces. The stress was analyzed in the abutment at Contact 1 and in the abutment and implant at Contact 2; the black dotted squares indicate the contact surfaces (A). The graphs of von-Mises stress values of the implant components (abutment and implant) and the maximum principal stress values of the resin/cement layer according to the contact surfaces (B).

  • Fig. 5 The gap formation at contact 1 and contact 2 surfaces. The extent of the contact surface was analyzed using the COPEN values. The black and white dotted circles indicate the location of maximum COPEN value on the surface (A). The graph of gap formation for the contact surfaces (B).

  • Fig. 6 The principal strain distribution of the bone. The surrounding bone consists of cortical and cancellous bone. Section A-A' is the upper surface of the cortical bone and B-B' is the interface between the cortical and cancellous bone (A). The percentage of bone volume according to the strain levels of maximum and minimum principal strain. The cylindrical bone parts near the implant are used for the analysis (B).


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