Kineziographic research of patients with cross bite.
The paper describes the use of an objective method for the quantitative analysis of the relationship between the posterior cross-bite and the occurrence of occlusive interferences and damages to the mandible muscle elevator. Two groups of subjects were selected for the analysis: 10 patients with unilateral cross-bite and 10 students without any symptoms of temporomandibular disorders (TMD). By means of the Robert Jenkelson K5A kinesiograph we measured maximal opening velocity of the mandible (mm/s), maximal-closing velocity (mm/s), first tooth contact velocity and displacement in the vertical plane at the maximal intercuspidation (mm). The following values were obtained: maximal-opening velocity in the first group was 349 mm/s and 380 mm/s in the control group. This difference was incidental. The maximal closing velocity in the study group was 204.9 and 345.2 in the control group (p < 0.05). The first tooth contact velocity in the study group was 75.93 and 325 in the control group (p < 0.01). Displacements in the vertical plane at the maximal intercuspidation in the investigated group was 0.24 +/- 0.01 mm, while in control group that value was 0.12 +/- 0.012 mm.
Grzić
R
R
Department of Dental Pathology and Prosthodontics, School of Dental Medicine, University of Rijeka, Croatia.
Kovac
Z
Z
Kovacević
D
D
Uhac
I
I
Delić
Z
Z
D000293:Adolescent; D000328:Adult; D001696:Biomechanical Phenomena; D002648:Child; D006801:Humans; D018953:Kinesiology, Applied; D008310:Malocclusion / Q000150:complications / Q000503:physiopathology*; D008336:Mandibular Diseases / Q000209:etiology*; D008409:Mastication; D018482:Muscle, Skeletal / Q000473:pathology; D012016:Reference Values