AVALIAÇÃO, IN VITRO, DE PREPAROS QUÍMICO-MECÂNICO DE CANAIS RADICULARES QUANTO AO DESVIO, LIMPEZA, MODELAGEM DO TERÇO APICAL E DEFORMAÇÕES MECÂNICAS DE INSTRUMENTOS DE NÍQUEL-TITÂNIO E AÇO INOXIDÁVEL

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

This study had as main objective to evaluate the apical third of root canals within cleaning, apical displacement, shaping after root canals preparations with both rotatory and alternating mechanized systems associated or not. It still had as objective, the detection of deformations and separations of endodontic flares used in the study. A total of 45 upper molars were prepared, 15 per group. The palatine root was sectioned and mesial and buccal root canals were prepared by predetermined techniques: Group I prepared with ProTaper rotatory systems, Group II, prepared with ProTaper rotatory systems in the cervical and medium thirds and with alternating systems with Flexofile in the apical third, Group III prepared with ProTaper rotatory systems in the cervical and medium thirds and with alternating systems with Nitiflex in the apical third. The evaluation of apical displacement was made by X-ray method in a way were a D0 0,15mm initial file in the working length could be compared to a D0 0, 30 mm file also in its working length. The Schneider angle before and after preparation method as well as the mesial-distal distances between the ending of both the files, initial (A) and final (B), distances (AB) (Anova Test) were also compared. Only in group III the difference between the Schneider angle before and after was significant to the mesial and distal buccal canals (p= 0.0000). Between all groups there were no significant differences of the Schneider angles after preparations to none of the canals. There were no statistical differences AB on the MV and DV of the same group, neither between the three groups. After histological processing it was observed that only between groups I and III had significant difference (Kruskall-Wallis test) on the cleaning percentages quantity (p=0,0119), this way being bigger in group I. Only between Groups I and III there was significant displacement (Man-Whitney test) on the cleaning quality (p=0,0174) this way, Group I was considered as most efficient. By the histological sectioning, final modelings of the root canals were seen. Group I -100% circular; Group II 73,3% circular, 26,6% elongated, group III 40 % oblong, 33,3% elongated and 26,6 circular. With an operatory clinical microscope it was observed that in Group I there was a fracture of one F3 File and four deformations, on files S1, S2, F2 and F3. On group II there were two deformations of the Protaper files: S1 an S2. On Group III there was 7 deformations of ProTaper files, where 3 was of ProTaper (Sx,S1 and F2) and 4 Nitiflex (15,20,25,35). It was concluded that the group I was the most effective in the cleaning as well as modeling subject. However, it was the one that offered the most risk of file fractures. The technique of group II is the one that promotes good cleaning and apical modeling and that offers less risk of instruments separation. The group III was the worst in the cleaning as well as shaping the apical third matter, the one that most promoted apical deviation and the one that offered higher rate of instrument fracture.

ASSUNTO(S)

odontologia endodontics instruments endodontia preparation preparo instrumentos

ACESSO AO ARTIGO

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