A Micro-computed Tomographic Assessment of Root Canal Preparation with a Novel Instrument, TRUShape, in Mesial Roots of Mandibular Molars

A novel S-shaped rotary file was developed to conform to nonround canal cross sections. However, the instrument should also perform well in small curved canals. This study used micro-computed tomographic scans to test the effects of TRUShape (Dentsply Tulsa Dental Specialties, Tulsa, OK) and a conve...

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Vydáno v:Journal of endodontics Ročník 41; číslo 9; s. 1545
Hlavní autoři: Peters, Ove A, Arias, Ana, Paqué, Frank
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States 01.09.2015
Témata:
Dental Pulp Cavity - diagnostic imaging
Equipment Design
Humans
Mandible
Molar - diagnostic imaging
Root Canal Preparation - instrumentation
Tooth Root - diagnostic imaging
X-Ray Microtomography
Canal transportation
dentin preservation
untreated surface
micro–computed tomographic imaging
ISSN:1878-3554, 1878-3554
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Shrnutí:A novel S-shaped rotary file was developed to conform to nonround canal cross sections. However, the instrument should also perform well in small curved canals. This study used micro-computed tomographic scans to test the effects of TRUShape (Dentsply Tulsa Dental Specialties, Tulsa, OK) and a conventional rotary on canal geometry. Twenty mandibular molars with independent mesial canals were submitted to preoperative micro-computed tomographic scans (20-μm resolution). Canals were randomly allocated to 2 groups using Vortex (Dentsply Tulsa Dental Specialties) and TRUShape for shaping according to the directions for use. Scans were obtained after size 20/.06 and 30/.06; the following outcome variables were calculated: dentin volume, smallest radicular wall thickness, treated canal surface, canal transportation, and accumulated hard tissue debris. The number of preparation errors was tabulated; data were statistically contrasted using repeated measures and factorial analyses of variance. The initial canal sizes were similar in both groups. Both instruments promoted preparation with no overt procedural errors. Vortex removed significantly more dentin both at size #20 and #30 (P < .02). Significantly (P < .02) more radicular wall dentin remained toward the furcation in the TRUShape group (1.02 ± 0.25 mm vs 0.94 ± 0.22 mm). The untreated surface at size #20 was 28.5 ± 13.9 and 19.4 ± 8.9 (P < .05), and it was 15.1 ± 8.5 and 11.3 ± 4.9 (P > .05) at size #30 for TRUShape and Vortex, respectively. Canal transportation at size #30 varied between 85 ± 57 μm and 179 ± 65 μm; the overall transportation scores were significantly lower for TRUShape (P < .05). TRUShape provided conservation of dentin by limiting dentin removal and in the absence of substantial canal transportation. In the present study, the use of TRUShape in the mesial canals of mandibular molars did not result in decreased amounts of unprepared canal surface.
Bibliografie:ObjectType-Article-1
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ISSN:1878-3554
1878-3554
DOI:10.1016/j.joen.2015.06.007