Occlusal force, masticatory cycles and mandibular flexure of subjects with different facial types / Força de mordida, ciclos mastigatorios e deflexão mandibular em individuos com diferentes tipos faciais

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Bite force can influence the development of the masticatory function and consequently the rehabilitation therapeutics. The high variability of this muscular function indicator can be associated to intrinsic aspects of the stomatognathic system such as the vertical facial morphology. However, the influence of this morphology on the maximum bite force and functional responses associated to muscular function are still not established. Thus, the purpose of this study was to verify the maximum occlusal force, the masticatory cycle patterns and the medial mandibular flexure in subjects with different facial types. Seventy-eight healthy and completely dentate subjects were classified by Rickets’ cephalometric analysis in accordance to the facial type into 3 groups: G1- Brachyfacial; G2- Mesofacial; e G3- Dolichofacial. The maximum occlusal force (MOF) was measured by means of force transducers located on the first molars region, during isometric clenching for 7 seconds. The types of masticatory cycles formed during the mastication of an artificial test material were evaluated on the frontal plane by the electromagnetic jaw-tracking method, using a kinesiograph. The medial mandibular flexure (MMF) was registered with addition silicone in the maximum opening and protrusion positions. MMF was determined by analysis of the distance between the occlusal surfaces of the contralateral first molars. Data of MOF and MMF were analyzed by ANOVA followed by Tukey pos hoc (α= .05). Measurements of maximum occlusal force were different (P <.0001) among groups, with G1 presenting the highest values, followed by G2 and G3, respectively. Considering the frontal plane, there was a predominance of tear drop cycles for G1 and hemi-oval type from the two other groups. The medial mandibular flexure of maximum opening showed significant differences among all facial groups (P <.0001). The highest value occurred in G1, followed by G2 and G3, respectively. The mandibular flexure of protrusion was significantly small on G3 group (P <.0001), additionally there were no differences between G1 and G2. Within the conditions of this study, we concluded that vertical facial morphology influenced the muscular functional patterns as well as the masticatory movement kinetic and the medial mandibular flexure.

ASSUNTO(S)

morphology cephalometry cefalometria mandible musculos mastigatorios masticatory muscles morfologia mandibula

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