Influence of cervical preflaring on determination of apical file size using to instrumentation in root of first maxillary molars: SEM analysis / Influência do alargamento cervical na determinação do instrumento apical inicial utilizado para instrumentação dos canais radiculares de primeiros molares superiores: análise por microscopia eletrônica de varredura

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The aim of this study was to investigate ex vivo the influence of cervical preflaring on determination the initial apical file (IAI), in the working length (WL), of the root canals of the maxillary first molars and to determine the shape of the canal at 1 mm from the apex. Fifty teeth were randomly divided into 5 groups (n=10) in accordance with the preflaring of the cervical and middle thirds of the canal: GI - without preflaring; GII - Gates-Glidden burs (#2, #3) (GG); GIII - AET (S1, SC, S2 and S3); GIV - GT Rotary File (20/06, 20/08, 20/10 and 20/10) (GT); GV - LA Axxess burs (20.06, 35.06) (LA). The canals were sized with the type K-file, passively inserting the file 08 in the WL and files with successively greater diameters until a binding sensation was felt. Cross sections were made in the WL, analyzed by SEM and the IAI area and the area of the root canal were measured to verify the percentage that the IAI occupied inside the canal in each sample. The shape of the root canal was classified as circular, oval and flattened. The analysis of variance indicated a statistically significant difference between the area occupied by the IAI and the experimental groups (p<0.0001). The results showed that for the mesiobuccal canal, the decreasing values by percentage that the IAI occupied inside the canal were: LA Axxess (66.70 ± 7.10) >GT (44.16 ± 9.35) = AET (44.10 ± 8.88) >GG (33.17 ± 6.68) = without preflaring (23.85 ± 6.86); for the distobuccal canal: LA Axxess (75.12 ± 8.56) >GT (58.68 ± 7.70) = AET (54.66 ± 7.12) >GG (39.76 ± 7.52) >without preflaring (26.90 ± 6.10); and for the palatal canal: LA Axxess (66.55 ± 11.40) >AET (51.98 ± 10.67) = GT (49.50 ± 10.05) >GG (35.70 ± 7.62) >without preflaring (21.43 ± 2.79). The shape of the canal was predominantly flattened for the mesiobuccal canal, circular for the distobuccal canal and oval for the palatal canal. It may be concluded that the preflaring of the cervical and middle thirds of the root canal allows better determination of the IAI and that the cervical preflaring with LA Axxess burs presented better adaptation of the IAI in the WL.

ASSUNTO(S)

endodontic preparo cervical tipos de instrumentos endodontia diâmetro anatômico cervical preflaring initial apical file instrumento apical inicial instrument type anatomic diameter

ACESSO AO ARTIGO

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