Masticatory efficiency and ability in relation to occlusion and mandibular dysfunction in girls.
OBJECTIVE
This study investigated the masticatory efficiency and ability in girls with normal occlusion and Class II malocclusion. Furthermore, it investigated the association between masticatory efficiency and ability on one hand and signs and symptoms of temporomandibular disorders (TMD) on the other hand.


METHODS
A total of 183 girls, aged 11 to 15 years, were included in this study. Sixty subjects had normal occlusion and 123 subjects had Class II malocclusion. The examination included registration of signs and symptoms of TMD. Masticatory efficiency was evaluated with a masticatory efficiency test, while masticatory ability was self-assessed on a visual analog scale.


RESULTS
Subjects with normal occlusion presented statistically significantly better masticatory efficiency and ability than subjects with Class II malocclusion. Thirty percent of the variation in masticatory efficiency was explained in a multiple regression analysis. Few occlusal contacts and a large overjet predicted a reduced masticatory efficiency. Subjects who reported frequent temporomandibular joint clicking and subjects who estimated their overall symptoms of TMD as moderate or severe also had reduced masticatory efficiency.


CONCLUSIONS
The authors concluded that masticatory efficiency and ability were partly dependent on the occlusion and that symptoms of TMD influenced the masticatory efficiency and ability.
Department of Orthodontics, Center for Oral Health Sciences, Malmö, Sweden.
T
T
Henrikson
E C
EC
Ekberg
M
M
Nilner
D000293:Adolescent; D000704:Analysis of Variance; D002648:Child; D003766:Dental Occlusion; D005157:Facial Pain / Q000209:etiology; D005260:Female; D006801:Humans; D008312:Malocclusion, Angle Class II / Q000503:physiopathology*; D008409:Mastication / Q000502:physiology*; D015588:Observer Variation; D010147:Pain Measurement; D012044:Regression Analysis; D012647:Self-Assessment; D018709:Statistics, Nonparametric; D011795:Surveys and Questionnaires; D013705:Temporomandibular Joint Disorders / Q000503:physiopathology*