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Effect of Slide in Centric Relation and Head Posture on the Occlusal Contact and Masticatory Muscle Activity

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Abstract

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This study was performed to investigate that change of the occlusal contact status including time, force, and balance between left and fight side dental arch and the electromyographic activity(EMG) of the anterior temporalis and the superficial masseter related to amount, firing time, and sequence on habitual or guided contact closing for the study, 28 dental students without any signs and symptoms of temporomandibular disorders(TMDs) were selected
The observation and measuring was earned out synchronously using T Scan It¢¥ II (Tekscan Co, USA) and BioEMG, (Bioresearch Ine, USA) in two head postures, natural and downward, and on three different closing types such as habitual closing, self-guided centric relation(CH) closing, and closing on maxillary CR splint, respectively The occlusal contact process was analyzed by contact timing, namels first, maximum, and end point of contact and the data obtained were statistically processed with SPSS window (ver 100) The results of this study were as follows
1. The whole contact time from the first to the end point of contact was the longest on habitual closing, and the shortest on closing on CR splint without regard to head posture, and this pattern was also shown for the occlusal contact torve with the most force on habitual closing The data of habitual closing and of CR closing, that is of natural tooth contact, showed highly significant correlation between them, but not correlated with the data of closing on CR splint.
2. The relative contact force(%) to maximum contact force and the occlusal contact balance did not show any consistent featnes and/or significant difference by closing types or contact timing.
3. The EMG activities of the superficial masseter were higher on habitual closing than on the other closing types In both head postures, but this pattern was not significantly prominent in case of the anterior temporalis, but the firing time of the super masseter was slightly shorter on habitual closing than on the other closing types, reversely Firing sequences among these masticatory muscles were not significant in all the closing types.
So It is concluded that closing on CR position without slide gives a less Impact on the dental arch and mastication muscles, therefore, which could be the one major component for the health of masticatory system In view of occlusion.

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