Influence of occlusal loading force on occlusal contacts in natural dentition. Issue 2 (April 2015)

• Record Type: Journal Article
• Authors: Imamura, Yoshiki; Sato, Yuji; Kitagawa, Noboru; Uchida, Keiichiro; Osawa, Tokiko; Omori, Miyuki; Okada, Yukihiko
• Is Part Of: Journal of prosthodontic research. Volume 59:Issue 2(2015)
• Page Start: 113
• Page End: 120
• Publication Date: 2015-04
• Subjects: Prosthodontics -- Periodicals; Dentistry -- Periodicals; Prosthodontics -- Periodicals; Electronic journals; Computer network resources; 617.6905
• DOI: 10.1016/j.jpor.2014.07.001
• Languages: English
• ISSNs: 1883-1958

Abstract

<abstract abstract-type="author" id="abs0005"> <title id="sect0005">Abstract</title> <sec> <title id="sect0010">Purpose</title> <p id="spar0005">Proper occlusal contact is important for the long-term success of prosthodontic therapy. We clarified the effects of occlusal loading force on occlusal contact in natural dentition by comparing measured values for occlusal loading and occlusal contact area.</p> </sec> <sec> <title id="sect0015">Methods</title> <p id="spar0010">Masseter muscle activity was measured in 10 subjects (2 male, 8 female; mean age, 27 years) with natural dentition using electromyography, with clenching at full strength with nothing interposed between the upper and lower teeth defined as 100% maximum voluntary contraction (MVC). Pressure-sensitive film (Occluzer) was used to examine occlusal contact points at 20, 40, 60, 80, 100 and 120% MVC. A material for checking accuracy of fit (BiteEye) was used to examine occlusal contact points at 20, 40, 60 and 80% MVC. ANOVA and the Bonferroni method were used to assess the results, with the level of significance set at 5%. Coefficients of variation (CV) were also calculated by dividing the standard deviation by the mean.</p> </sec> <sec> <title id="sect0020">Results</title> <p id="spar0015">Occlusal loading and occlusal contact area increased with clenching strength; however, CV showed differences between the methods at low and high MVC.</p> </sec> <sec> <title id="sect0025">Conclusions</title> <p id="spar0020">With Occluzer, testing should be carried out at clenching strength ≥60% MVC. With BiteEye, testing should be carried out from light clenching strength at 20% MVC to moderate clenching strengths at 40–60% MVC. Occluzer and BiteEye (10 μm) gave similar occlusal contact areas at 60–80% MVC. These results suggest that combined use of Occluzer and BiteEye gives an accurate picture of occlusion from weak to strong clenching strength.</p> </sec> </abstract>