Resumo

FERRAZ, Ianara Janayna Leal et al. Morphometric evaluation of the apical region after the use of oscillatory and rotary syeterns. RFO UPF [online]. 2014, vol.19, n.3, pp. 311-315. ISSN 1413-4012.

Objective: to comparatively assess the oscillatory and continuous systems for canal preparation from the morphometric analysis of the apical region of molars prepared with hand Flexofiles driven by pneumatic motors (oscillatory) and electric motors (rotary) coupled to ProTaper Universal system. Materials and Methods: twenty roots of extracted human mandibular molars with approximate curvatures of 30 degrees were selected and initially subjected to radiographs. Radiographs were scanned, and the area and perimeter of the apical region were determined by the Software Image tool. Then the roots were randomly divided into two groups: in group I, the roots were instrumented by the oscillatory system, and in group II, by the rotary system. The cervical and middle thirds were prepared with Gates Glidden 1 and 2. After chemo-mechanical preparation, new radiographs were taken to determine the new area and perimeter. The results were statistically analyzed using the Statistical Package for the Social Sciences (SPSS) version 20.0, with a significance level of 5% (p < 0.05). Results: the rotary system presented statistically significant difference regarding the area before and after chemical and mechanical preparation (p<0,05), and there was no difference regarding the perimeter. Apical deviation was not observed, which is attributed to the greater proportionality between apical preparation and dilation of middle and cervical thirds, previously performed. Conclusion: both systems presented an acceptable apical preparation, however Flexofiles' oscillatory system caused less wear on dentin thickness when compared to the ProTaper Universal system..

Palavras-chave : Root Canal Therapy.; Tooth Apex.; Dental Instruments.; Endodontics..