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Abstract
Purpose
The importance of occlusal contacts of the natural dentition for durability of teeth, mandibular stabilization, and restorative dentistry is well known. The purpose of this study is to analyze the occlusal contact and guidance pattern of Koreans by evaluating the static occlusion on maximal intercuspal position and measuring dynamic occlusion during straight protrusion.
Materials and methods
The occlusal contacts at maximal interincisal position and the occlusal guidance pattern during straight protrusion of 29 subjects were recorded with shimstock foil (Whaledent, Langenau, Germany), T-Scan III (Tekscan Inc., Boston, MA, USA), polyvinylsiloxane registration material (Genie Bite, Sultan Healthcare, Hackensack, NJ, USA) and compared. Occlusal registration procedures were repeated 3 times. The position was fixed to an upright position and the head position was fixed with the Frankfurt horizontal plane paralleling the horizontal plane. Fisher's Exact Test (R-General Public License, ver. 2.14.1) and Pearson's Test were used to assess the significance level of the differences between the experimental groups (α =.05).
Results
When using shimstock foil, T-Scan III system, and polyvinylsiloxane registration material, most of the patients showed contact on anterior, premolar, and molar teeth during maximal intercuspal position. Approximately 51% of maximal intercuspal position showed anterior contact using shimstock foil. When examining the protrusive movement using shimstock foil and T-Scan III system, guidance pattern with the central incisor was the most common.
Conclusion
During maximal intercuspal position, there were cases in which not all of the teeth showed occlusal contact. During mandibular protrusive movements, one or more maxillary central incisors frequently joined in straight protrusion and the posterior teeth were disoccluded. Therefore, the anterior teeth protect the posterior teeth, and vice versa. Thus, mutually protected occlusion should be applied when reconstructing occlusion. (J Korean Acad Prosthodont 2013;51:199-207)
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Fig. 2.
Number of contact tooth of Mx. in maximal intercuspal position evaluated with shimstock foil (n = 406); CI: central incisor, LI: lateral incisor, C: canine, P1: first premolar, P2: second premolar, M1: first molar, M2: second molar.
Fig. 4.
Number of contact tooth of Mx. in maximal intercuspal position evaluated with T-Scan III system (n = 406); CI: central incisor, LI: lateral incisor, C: canine, P1: first premolar, P2: second premolar, M1: first molar, M2: second molar.
Fig. 6.
Number of contact tooth of Mx. in maximal intercuspal position evaluated with polyvinylsiloxane registration material (n = 406); CI: central incisor, LI: lateral incisor, C: canine, P1: first premolar, P2: second premolar, M1: first molar, M2: second molar.
Fig. 7.
Distribution of contact pattern evaluated with polyvinylsiloxane registration material (n = 29).
Fig. 8.
Number of contact tooth of Mx. in straight protrusion evaluated with shimstock foil (n = 406); CI: central incisor, LI: lateral incisor, C: canine, P1: first premolar, P2: second premolar, M1: first molar, M2: second molar.
Fig. 10.
Number of contact tooth of Mx. in straight protrusion evaluated with T-Scan III system (n = 406); CI: central incisor, LI: lateral incisor, C: canine, P1: first premolar, P2: second premolar, M1: first molar, M2: second molar.
Table 1.
Classification of occlusal contact pattern (maximal intercuspal position)
| Contact pattern | Definition | |
|---|---|---|
| Type A | Non contact on anterior teeth | |
| Type B | Contact on anterior teeth | Contact on premolar & molar teeth |
| Type C | Non contact on premolar teeth | Contact on molar teeth |
Table 2.
Classification of occlusal guidance pattern (protrusive movement) Guidance pattern Definition
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