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KMID : 0988720090250030255
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Journal of the Korean Academy of Stomatognathic Function and occlusion
2009 Volume.25 No. 3 p.255 ~ p.265
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Effect of Implant Length on the Immediate Loading at the Anterior Maxilla
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Lee Joon-Seok
Kim Myung-Joo
Kwon Ho-Beom
Lim Young-Jun
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Abstract
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Recently many studies have been published on application of immediate loaded implants. However, the immediate loading protocol has not been well documented. The purpose of the present study was to evaluate the stress distribution between bone-implant interfaces and the effect of implant length in the anterior maxilla using 3 dimensional finite element analyses. The diameter 4.0 ㎜ threaded type implants with different length(8.5 ㎜, 10.0 ㎜, 11.5 ㎜, 13.0 ㎜, 15.0 ㎜) were used in this study. The bone quality of anterior maxillary bone block was assumed to D3 bone. Bone-implant interfaces of immediately loaded implant were constructed using a contact element for simulating the non osseointegration status. For simplification of all the processing procedures, all of the material assumed to be homogenous, isotropic, and linearly elastic. The 178 N of static force was applied on the middle of the palatoincisal line angle of the abutment with 120° angle to the long axis of abutment. Maximum von Mises stress were concentrated on the labial cortical bone of the implant neck area, especially at the cortical-cancellous bone interfaces. Compared the different length, highest peak stress value was observed at the 8.5 ㎜ implants and the results indicated a tendency towards favorable stress distribution on the bone, when the length was increased. Presence of cortical bone was very important to immediate loading, and it appears that implants of a length more than 13 ㎜ are preferable for immediate loading at the anterior maxilla.
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KEYWORD
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immediate loading, bone-implant interface, anterior maxilla, finite element analysis
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