A comparison of canal centering abilities of four root canal instrument systems using X-ray micro-computed tomography / 대한치과보존학회지
Journal of Korean Academy of Conservative Dentistry
;
: 61-68, 2007.
Artigo
em Inglês
| WPRIM
| ID: wpr-220099
ABSTRACT
The purpose of this study was to compare the centering abilities of four root canal instrument systems and the amounts of dentin removed after root canal shaping using them. The mesial canals of twenty extracted mandibular first molars having 10 - 20degrees curvature were scanned using X-ray micro-computed tomography (XMCT)-scanner before root canals were instrumented. They were divided into four groups (n = 10 per group). In Group 1, root canals were instrumented by the step-back technique with stainless steel K-Flexofile after coronal flaring. The remainders were instrumented by the crown-down technique with Profile (Group 2), ProTaper (Group 3) or K3 system (Group 4). All canals were prepared up to size 25 at the end-point of preparation and scanned again. Scanned images were processed to reconstruct three-dimensional images using three-dimensional image software and the changes of total canal volume were measured. Pre- and post-operative cross-sectional images of 1, 3, 5, and 7 mm from the apical foramen were compared. For each level, centering ratio were calculated using Adobe Photoshop 6.0 and image software program. ProTaper and K3 systems have a tendency to remove more dentin than the other file systems. In all groups, the lowest value of centering ratio at 3 mm level was observed. And except at 3 mm level, ProTaper system made canals less centered than the other systems (p < 0.05).
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Aço Inoxidável
/
Ápice Dentário
/
Imageamento Tridimensional
/
Cavidade Pulpar
/
Dentina
/
Microtomografia por Raio-X
/
Dente Molar
Idioma:
Inglês
Revista:
Journal of Korean Academy of Conservative Dentistry
Ano de publicação:
2007
Tipo de documento:
Artigo
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