[Changes in M. temporalis activity in subjects with full dentures]

Abstract

Kod 35 ispitanika sa prirodnim zubima ii 30 nosilaca totalnih proteza istražena je aktivnost m. temporalis anterior et posterior metodom površinske elektromiografije na aparatu sa ugrađenim digitalnim integrator i ma. Registracije su vršene u svim okluzijskim položajima (retruzija, incizalni položaj, dekstro i sinistrolateralna okluzija, maksimalna mterkuspidacija). Rezultati su prikazani u postocima maksimalne interkuspidaciije, a obrađeni su metodom analize varijance. Utvrđena je relativno veća aktivnost m. temporalis ant. kod nosilaca totalnih proteza u retruziji lateralnoj okluziji na radnoj strani [p < 0 ,0 1 ), što se pripisuje većem broju kontakta na lateralnim zubima kod proteza u ovim položajima. Također je utvrđena veća aktivnost m. temp. post. u (incizalnom položaju i lateralnoj okluziji na kontralateralnoj strani kod nosilaca totalnih proteza (p < 0,01 J. To se pripisuje manjem incizalnom kutu kod totalnih proteza, kao i rotaciji manđibule prema gore i naprijed uslijed resorpcije alveolnog grebena.The activity of anterior et posterior temporal muscle was studied in 35 subjects with natural teeth and 30 subjects with full dentures, employing the method of surface electromyography by means of a device supplied with built-in digital integrators. Records were taken in all occlusal positions (i.e. retrusiion, incisal position, d extra- and sinistro-lateral occlusion, maximal intercupation). The results obtained were processed by the method of variance analysis and are presented as percentage of maximal interciuspation. A relatively higher activity of m. temporalis anterior in retrusion and lateral occlusion on the working side was found in the subjects with full dentures (p < 0 ,0 1 ), which was attributed to more frequent contacts on the lateral teeth in dentures in theise positions. In these subjects, a higher activity of m. temporalis posterior was also found in the incisal position and lateral occlusion on the -contralateral side (p < 0 .0 1 ), which was ascribed to less steep incisad angle in full denture wearers, as well as an upward and forward rotation of the mandible due to resonption of residual ridges