日本口腔インプラント学会誌
Online ISSN : 2187-9117
Print ISSN : 0914-6695
ISSN-L : 0914-6695
原著
経過良好な臼歯部1歯中間欠損部単独植立インプラントの咬合状態
奥山 淡紅子佐藤 裕二小沢 宏亮北川 昇内田 圭一郎
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ジャーナル フリー

2010 年 23 巻 2 号 p. 209-219

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Purpose: Slight disharmony of occlusion in implant prostheses may cause many problems because there is no periodontal membrane or nerve system as a stress breaker. However, much remains unclear regarding the optimum occlusal contacts of implant prostheses. The purpose of this study was to investigate variations of changes in occlusal load according to clenching strength of implant prostheses and occlusal gap for implants.
Method:The subjects consisted of 17 patients (59±16years old) with an implant for a single intermediate missing posterior tooth with satisfactory prognosis for more than two years. Electromyograms for maximum clenching at the intercuspal position were recorded as 100% MVC (maximum voluntary contraction). Subsequently, clenching at 20, 40, 60, and 80% MVC was instructed with visual feedback. Occlusal load was recorded with pressure-sensitive sheets. Occlusal contacts were recorded with a silicon occlusal contact checking material. The changes in occlusal load according to clenching strength for the implant and each adjacent tooth were examined. The occlusal gap for implants could be estimated from both the occlusal forces of implants and individual teeth and existing data on the degree of displacement.
Results: The subjects were classified into three groups: the WC (Weak clenching) group where occlusal load on implants was recorded from weak (20% MVC) clenching; the MC (Moderate clenching) group where load was recorded from moderate (40% MVC) clenching; and the SC (Strong clenching) group where load was recorded from strong (60% MVC) clenching. At maximum clenching, average loads on implants were 110 N (WC), 90 N (MC), and 123 N (SC), respectively. Average occlusal gaps for implants were less than 43μm (WC), more than 83 μm (MC), and more than 197μm (SC).
Conclusion:The occlusal gap for implants could be estimated with the newly developed method. Clinically, there were many kinds of occlusal situations between the implants and the natural teeth with satisfactory prognosis. These results suggest that the occlusal gap for implants might have some adequate range. However, a long-term study is needed to determine the functional aspects.

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