咬合의 安定性과 咬合音에 關한 硏究 = A Study on the Occlusal Stability and Occl usal Contact Sound

다국어 초록 (Multilingual Abstract)

The purpose of this study was to investigate about the relationship between the tapping sound and occlusal contacts in centric occlusion and apply its results to clinical parameter as a diagnostic aid.
Forty-seven subjects, 20 to 25 years of age, without symptoms of stomatognathic dysfunction were selected from dental students in Chosun University for this study. The tapping sound in centric occlusion were recorded as bone conduction sounds using a gnathosonic instrument (Dental Sound Checker TME-202C,Yoshida Co.,Japan) and the average duration of the right and left sound was measured. With these records, the subjects were classified in three groups as Class I (with stable contacts), ClassⅡ (with mixed contacts) and Class Ⅲ (with unstable contacts).
Occlusal stability was evaluated by the nature of centric occlusal contacts. The centric occlusal contacts were marked and surveyed on the upper and lower occlusal surfaces of the stone models which were mounted on Hanau model H articulator by the interocclusal records using rubber base impression material. Finally, the relationship between the occlusal pattern and nature of centric occlusal contacts was observed.
The results of this study were as follows:
1. In the 47 subjects, 16 were Class Ⅰ,15 were Class Ⅱ and 16 were Class Ⅲ ,and their average durations were 8.50 msec., 9.77 msec. and 13.68 msec. respectively.
2. The average numbers of teeth with both mesiodistal and buccolingual coupled contact were 5.64 and those of occlusal contact points in C.O. were 57.81. The ratio of the surface contact over 1mm in diameter to the total contact point was 44.54％ in Class I group.
3. The average numbers of teeth with coupled contact were 5.53 and those of contact points were 57.33. The ratio of the surface contact over 1mm in diameter to the total contact point was 52.67％ in Class Ⅱ group.
4. The average numbers of teeth with coupled contact were 3.75 and those of contact point were 47.63. The ratio of the contact points over 1mm in diameter to the total contact points was 54.33％ in Class Ⅲ group.