Influência do aumento do diâmetro cirúrgico sobre a limpeza do terço apical de canais radiculares curvos submetidos ao preparo biomecânico com instrumentos de Níquel-Titânio / Influence of surgical diameter augmentation on cleaning of the apical third of curved root canals submitted to biomechanical preparation with nickel-titanium instruments

AUTOR(ES)

Volmir João Fornari

DATA DE PUBLICAÇÃO

2006

RESUMO

This study evaluated the influence of the surgical diameter on the cleaning capacity of Hero 642 system in root canals, using morphometric analysis. Roots of forty maxillary molars with curvature angle between 20 and 40, curvature ratius ≤ 10 mm and diameter corresponding to the 25 instrumnets were randomly divided into 4 groups according to the surgical diameter of the last instrument: GI 30/.02; GII - 35/.02; GIII 40/.02 and GIV - 45/.02. Distilled water was used for irrigation. The apical thirds were submitted to histological processing and analyzed at 40X magnifying. The images were captured and submitted to morphometric analysis with an integration grid. The action perimeter of the instruments on the root canal walls was determined with Software Scion Image. Data were analyzed by ANOVA and Tukey test considering the debris presence (DP) in root apical third and dentin without instrument contact (IC). The statistical analysis showed no significant difference (p>0.05) between GIII (DP-15.82% 6.66; IC-38.08% 10.44) and GIV (DP-12.78% 3.11; IC-32.35% 8.51), which presented better results than GI (DP-34.62% 9.49; IC-55.64% 4.62) and GII (DP-25.33% 7.37; IC-49.03% 5.70). Pearsons correlation test displayed a liner relation between the amount of apical debris and the area without instrument contact. It may be concluded that root canal preparation with Hero 642 instruments of higher diameters allowed more contact with the root canal walls and were also more efficient on debris removal.

ASSUNTO(S)

dentistry odontologia odontologia endodontics root canal canal radicular tratamento endodontia treatment

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