Efeito da reabilitação protetica removivel bucal na espessura muscular e força de mordida em crianças na dentição mista / Effect of the removable prosthetic rehabilitation on muscle thickness and bite force of children in the mixed dentition

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The aim of this study was to evaluate the maximum bite force and the thickness of the masseter and anterior portion of the temporalis muscles in twenty-five children with early loss of primary teeth, before and six months after oral rehabilitation with removable dental prosthesis. Three chapters compose the study. In chapter 1, entitled Maximum bite force ? a review of the literature, a review of the pertinent literature about maximum bite force was done, and the influencing variables were discussed. The review showed that bite force has been widely evaluated and associated to the morphological and functional variables of the masticatory system. The second chapter, entitled A six-month evaluation of maximum bite force in wearing a removable dental prosthesis it was evaluated the bite force of the children; and in chapter 3, entitled Masseter and temporalis muscle thickness of children wearing removable dental prosthesis ? a six-month evaluation evaluated the thickness of the masseter and anterior portion of the temporalis muscles by means of ultrasonography. Also, it was evaluated the body variables, represented by facial proportions, weight and height in chapters 2 and 3. Bite force was determined with a pressurized transducer, which consisted of a pressurized rubber tube connected to a sensor element (MPX 5700, Motorola SPS, Austin, TX, USA). Muscle thickness was measured during relaxation and maximum clenching, using the Just-vision 200 digital ultrasonography system (Toshiba Corporation, Japan) with a high-resolution real-time 56 mm/10-MHz linear-array transducer. Facial proportions were determined through measurements of the face in standard photographs. For data analysis in the second and third chapters, the normality of the distributions was assessed by the Shapiro-Wilks W-test. The t paired or unpaired tests, Wilcoxon, Mann-Whitney, Pearson?s or Spearman?s Correlations and linear regression were applied as indicated, with significance level of 5%. The results showed no statistical differences between genders for any of the variables (p>0.05). There was statistical significant increase in muscle thickness from relaxation to clenching; between bite force and masseter muscle thickness both during clenching and relaxation from the first to the second evaluation; the temporalis muscle was thicker in before the placement of the prosthetic device (p<0.05), which did not happen for the contracted temporalis. There were not correlations between facial proportions and muscle thickness or bite force (p>0.05). Considering the body variables, there was a significant correlation between masseter muscle thickness during relaxation and body height in the first evaluation, and between masseter muscle thickness (both contracted and relaxed) and all the body variables in the second evaluation (p<0.05). In relation to the temporalis muscle, it was found a significant correlation between the contracted muscle and height in the first evaluation, and between the relaxed muscle and weight in the second evaluation (p<0.05). In relation to the bite force, there was only a correlation with body height in the second evaluation (p<0.05). Within the limitations of this study, it can be concluded that the removable dental prosthesis influenced the morphology of the muscles, determining an increase in muscle thickness, and the function, increasing the bite force

ASSUNTO(S)

músculo masseter temporal muscle ultrasonography denture partial ultrasonografia removable masseter muscle protese dentaria parcial removivel

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