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

Abstract

PURPOSEA 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 METHODSThe 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.RESULTSValues 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.CONCLUSIONCLF had no disadvantages in terms of the biomechanical features compared with conventional CR implant prosthesis and could be successfully applied for implant prosthesis.

Types of retention for implant-supported fixed prosthesis: a narrative literature review

“…Dessa forma, uma das principais vantagens desse mecanismo é a redução da taxa de complicações biológicas aos tecidos moles da cavidade bucal 26 . Esse sistema é estruturalmente semelhante às próteses cimentadas, no entanto a superfície interna da coroa e o abutment são revestidos por resina composta 27 .…”

Biomechanical stress and microgap analysis of bone-level and tissue-level implant abutment structure according to the five different directions of occlusal loads

“…Many studies have been performed to overcome these complications through a series of stress analyses, including a finite element analysis (FEA). 7 8 9 10 11 12 13 14 15 16 17 18 19 20 …”

“…Many studies have been performed to overcome these complications through a series of stress analyses, including a finite element analysis (FEA). [7][8][9][10][11][12][13][14][15][16][17][18][19][20] Several factors influence the stress distribution of implant restorations, such as the crown height, type of the implant connection, the direction of the load, cusp inclination, size of the occlusal table, and implant angulation. The stress level of the implant increased with increasing crown height, which appears to be a more critical factor than the crown-implant ratio.…”

A novel retentive type of dental implant prosthesis: marginal fitness of the cementless double crown type implant prosthesis evaluated by bacterial penetration and viability

“…1). 7 The retentive principle of the CL.F system facilitates the precise fit of the margin area of the crown, and the marginal fitness of the crown affects plaque deposition, infiltration of microorganism, and development of peri-implantitis.…”