Occlusal Facets and Contacts in Normal Dentition

The purpose of this study was to evaluate the relationship between the clenching level and the intercuspal contact area in different regions of the dental arch. Twenty-five healthy subjects with natural normal dentitions and good occlusal support performed clenching tasks in the intercuspal position at four different levels (10, 30, 70 and 100% levels of maximum voluntary contraction) through EMG visual feedback from bilateral masseter and anterior temporal muscles. Simultaneously, the occlusal contacts were recorded with a silicone occlusal contact checking material (Black Silicone, GC Dental Industrial Corp., Tokyo, Japan). The occlusal records were analysed by an image analyser. Every area of the thickness less than 50 microm was determined to be an occlusal contact area. The occlusal contact areas on the anterior teeth (incisors and canines), the premolars (first and second premolars) and the molars (first and second molars) were calculated separately. The posterior occlusal contact area increased with an increase in the clenching levels but that of the anterior did not. The results of this study indicate that the increase in clenching forces affects the anterior and posterior occlusal contact areas differently.

Section: Methodsmentioning

confidence: 99%

Influence of clenching level on intercuspal contact area in various regions of the dental arch

Gurdsapsri

Baba

et al. 2000

“…A variety of methods have been used to measure occlusal contact, such as occlusal strips or silk, three‐dimensional (3D) occlusal examination or examinations using articulating paper, the Dental Prescale system , and the Black Silicone‐image analysing device system . Examinations with the Dental Prescale system or Black Silicone‐image analysing device system and 3D occlusal examinations can quantitatively measure the occlusal contact area, but the Dental Prescale system and Black Silicone‐image analysing device system cannot measure the near contact area.…”

Section: Introductionmentioning

confidence: 99%

Association between near occlusal contact areas and mixing ability

Horie

Kanazawa

Komagamine

et al. 2014

This study investigated the relationship between occlusal contact and near contact areas defined by clenching intensity using electromyograms (EMGs) and mixing ability assessed with colour-changeable chewing gum. Participants comprised 44 dentate adults (24 men, 20 women) with a mean age of 28·2 ± 6·8 years. Silicone material was used to measure the occlusal contact and near contact areas (the area of each type of tooth, the total area of the first molar and second molar, the second premolar to the second molar and the first premolar to the second molar) defined by clenching intensity at 10% maximum voluntary contraction (MVC). Colour-changeable chewing gum was used to assess mixing ability. A colorimeter was used to measure colour changes, and the calculated colour difference (ΔE) was used as a measure of mixing ability. Correlation analysis of ΔE and occlusal contact and near contact areas revealed a significant positive correlation of 0·47 at 0-160 μm thicknesses of the silicone registration material of the second molar (P < 0·01). The near contact area with a thickness up to 200 μm was correlated with mixing ability, with the correlation strengthening as the interocclusal distance increased up to 160 μm. Notably, occlusal contact and near contact areas of the second molar were strongly correlated with mixing ability in dentate adults.

“…Various opinions exist upon the interocclusal distance that should be regarded as occlusal contact (18–20). In the present study, contact areas with interocclusal distances of ≤0·06 mm were defined as occlusal contacts, because a remarkable decrease in the transmission rate of light was observed in areas with an interocclusal distance of >0·06 mm.…”

Section: Discussionmentioning

confidence: 99%

“…Based on Nakao's method (18), a silicone impression material (GN‐I CAD Silicone)* was used to calibrate the appropriate thresholds for contact measurement. This silicone material was also used to take interocclusal records at the ICP.…”

Section: Methodsmentioning

confidence: 99%

Relationship between occlusal tooth contact patterns and tightness of proximal tooth contact

Oh¹,

Nakano²,

Bando³

et al. 2006

The aim of this study was to investigate the relationship between occlusal tooth contact patterns and the tightness of proximal tooth contact (TPTC) during clenching. Twenty young adult volunteers with healthy dentition participated in the study. TPTC between the left second premolar (P2) and the first molar (M1) was measured during clenching at the 50% maximum voluntary contraction level in the intercuspal position (ICP). A silicone impression material was used to make an interocclusal record at the ICP in each subject, and interocclusal records were analysed using an image-processing system. Subjects were classified according to the presence or absence of each type (A, B or C) of occlusal contact. Statistical analysis was performed using the Mann-Whitney U-test. The results of this study exhibited a relationship between B-type contact and the TPTC of maxillary teeth. The experimental group with a lack of B-type contact on maxillary P2 and/or M1 showed a statistically greater TPTC than the group with B-type contact on both of these teeth (P < 0.01). These results suggest that occlusal tooth contact patterns have an influence on TPTC during clenching.