1. Comparison of direct and indirect occlusal contact examinations with different clenching intensities.
- Author
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Komiyama, O., Obara, R., Iida, T., Asano, T., Masuda, M., Uchida, T., De Laat, A., and Kawara, M.
- Subjects
DENTAL impression materials ,DENTAL impressions ,ELECTROMYOGRAPHY ,MASTICATORY muscles ,DENTAL occlusion ,RESEARCH funding ,STATISTICS ,DATA analysis ,DESCRIPTIVE statistics - Abstract
The aims of this study were to examine the change of occlusal contact area following the increment of clenching intensity using silicone materials and electromyography ( EMG) in normal subjects and to compare direct intra-oral examination with indirect examination using dental casts mounted by means of two impression methods. Participants were 7 men and 5 women with no more than one missing tooth per quadrant and no pain in the head and neck region. During the task, intercuspal position was maintained with minimal force, 20% maximum voluntary contraction ( MVC) and 40% MVC using electromyography visual feedback. Three types of occlusal contact examinations were performed with the aid of blue silicone material in randomised order: (i) intra-oral direct occlusal contact examination ( DE), (ii) indirect occlusal contact examination with dental casts using conventional impression method ( IEC) and (iii) using occlusal impression method ( IEO). Total occlusal contact area during DE and IEO significantly increased from baseline to 20% MVC and from baseline to 40% MVC, but not during IEC. Total occlusal contact area during DE in all tooth clenching conditions was significantly larger compared to IEO and IEC ( P < 0·05). At 40% MVC, total occlusal contact area during IEO was significantly larger than during IEC ( P < 0·05). These findings suggest that indirect occlusal contact examinations may not accurately reflect the intra-oral occlusal condition. If the intra-oral condition is reproduced using dental casts, these findings also suggest the occlusal impression method was more accurate compared to the conventional method (240 words). [ABSTRACT FROM AUTHOR]
- Published
- 2015
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