Pattern of occlusal contacts in lateral positions: Canine protection and group function validity in classifying guidance patterns☆,☆☆,★,★★,♢
Section snippets
MATERIAL AND METHODS
Eighty-six subjects (62 men, 24 women) between the ages of 20 to 29 years (average = 24.2 years) were selected from a group of 170 undergraduate students in the fourth, fifth, and sixth years of the Faculty of Dentistry. The criteria for inclusion in the study were as follows: All subjects had to (1) be in their twenties; (2) have normal occlusal alignment with an Angle Class I relationship; (3) have full dentition except for third molars; (4) have no history of orthodontic therapy; and (5)
RESULTS
Fig. 2, Fig. 3 illustrate the frequency of contact on each tooth according to the lateral position. The percentages of excursions in contacts were calculated from the data of both right and left sides.
The working side occlusal contact was predominantly on the canine in all lateral positions (Fig. 2). Frequency of contact decreased gradually from the canine to the first molar as the tooth type
DISCUSSION
In many studies of occlusal contact patterns, the occlusal contacts have been recorded in an edge-to-edge position of the canines approximately 3 mm lateral from the maximum intercuspation,27, 29, 30 or in an unregulated position. Because this position is rarely used during mastication except in incising food and in parafunction such as bruxism,26, 31 recent studies have investigated the pattern of occlusal contact in regulated positions in the range of 1 to 3 mm from the maximum intercuspation.
CONCLUSIONS
Canine protection and group function have been used when describing occlusal contact patterns during lateral excursion and are simple and useful concepts to outline the occlusal guidance pattern. They are widely accepted as types of therapeutic occlusion in natural dentition. However, much confusion and inconsistency has accompanied the interpretation of these terms. On the basis of the results of this study, it does not seem appropriate to describe and classify the patterns of occlusal contact
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Reprint requests to: Dr. Takahiro Ogawa Department of Removable Prosthodontics Faculty of Dentistry Kyushu University 3-1-1 Maidashi, Higashi-ku Fukuoka 812-8582 JAPAN
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0022-3913/98/$5.00 +0.10/1/90699
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aResearch Associate, Department of Removable Prosthodontics.
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bGraduate Student, Department of Removable Prosthodontics.
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cProfessor and Chairman, Department of Removable Prosthodontics.