Masticatory path pattern during mastication of chewing gum with regard to gender difference.
OBJECTIVE
To clarify the masticatory path patterns of the mandibular incisal point during mastication of softened chewing gum with regard to gender difference.


METHODS
One hundred healthy subjects (50 males and 50 females) were asked to chew softened chewing gum on one side at a time (right side and left side) and the movement of the mandibular incisal point was recorded using MKG K6I. After a catalog of path patterns was made, the movement path was classified into one of the pattern groups, and then the frequency of each pattern was investigated.


RESULTS
A catalog of path patterns consisting of the three types of opening path (op1, linear or concave path; op2, path toward the chewing side after toward the non-working side; op3, convex path) and two types of closing path (cl1, convex path; cl2, concave path) was made. The movement path was classified into one of seven patterns, with six patterns being from the catalog and a final extra pattern in which the opening and closing paths crossed. The most common pattern among the subjects was Pattern I, followed by Patterns III, II, IV, V, VII, and VI, in that order. The majority of cases, 149 (74.5%) of 200 cases, showed either Pattern I (op1 and cl1) or Pattern III (op2 and cl1). There was no significant difference between the two genders in the frequency of each pattern.


CONCLUSIONS
The movement path could be classified into seven patterns and no gender-related difference was found in the frequency of each pattern.
Kobayashi
Yoshinori
Y
Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo 102-8159, Japan. y-kobaya@tokyo.ndu.ac.jp
Shiga
Hiroshi
H
Arakawa
Ichiro
I
Yokoyama
Masaoki
M
Nakajima
Kunihisa
K