Retreatment efficacy of gutta-percha removal using a clinical microscope and ultrasonic instruments: Part I—an ex vivo study

Objective This study compared the efficacy of gutta-percha/sealer removal from endodontically treated extracted human teeth with and without the aid of a clinical operating microscope/ultrasonic instruments. Study design Forty human extracted maxillary central incisors were prepared using a modified...

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Published in:Oral surgery, oral medicine, oral pathology, oral radiology and endodontics oral medicine, oral pathology, oral radiology and endodontics, 2009-07, Vol.108 (1), p.e59-e62
Main Authors: de Mello, Jose Eduardo, DDS, MSc, Cunha, Rodrigo Sanches, DDS, MSc, PhD, da Silveira Bueno, Carlos Eduardo, DDS, MSc, PhD, Zuolo, Mario Luis, DDS, MSc
Format: Article
Language:English
Subjects:
Dental Pulp Cavity - pathology
Dentistry
Gutta-Percha - therapeutic use
Humans
Image Processing, Computer-Assisted
Microsurgery - instrumentation
Photography
Retreatment
Root Canal Filling Materials - therapeutic use
Root Canal Irrigants - therapeutic use
Root Canal Preparation - instrumentation
Sodium Hypochlorite - therapeutic use
Solvents - therapeutic use
Surgery
Ultrasonic Therapy - instrumentation
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Summary:Objective This study compared the efficacy of gutta-percha/sealer removal from endodontically treated extracted human teeth with and without the aid of a clinical operating microscope/ultrasonic instruments. Study design Forty human extracted maxillary central incisors were prepared using a modified crown-down technique and filled with lateral compactation. Teeth were divided into 2 groups: group I, re-treated using a conventional technique with burs and solvent; and group II, re-treated using a conventional technique with burs and solvent plus clinical operating microscope/ultrasonic tips. Teeth were split longitudinally and photographed, and coded photos transfered to a computer workstation. Total canal space and remaining gutta-percha/sealer were quantified, and ratio of remaining filling material and root canal periphery was computed. Mean percentage of remaining gutta-percha/sealer in each group was compared using analysis of variance. Results The average percentage of remaining gutta-percha/sealer was 25.21% in group I and 9.31% in group II, showing a statistically significant difference ( P = .05). Conclusion The use of the dental operating microscope and ultrasonic tips removed the filling material from root canal walls better, but all examined teeth, in both groups, had remaining filling material on canal walls.
ISSN:1079-2104
1528-395X
DOI:10.1016/j.tripleo.2009.03.027