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Micro-computed tomography analysis of post space preparation in teeth obturated with carrier-based thermoplasticized gutta percha techniques

University of British Columbia

Many dentists use the obturation technique of carrier-based thermoplasticized gutta percha. Placement of a post may be indicated for teeth in which there has been extensive loss of coronal tooth structure. This study aimed to determine if post space preparation deviated from the endodontic preparation in teeth obturated with the Thermafil, GuttaCore, or gutta percha material. Forty-two extracted human permanent maxillary lateral incisors were decoronated and their root canals instrumented with nickel-titanium rotary files using a standardized protocol. Samples were divided into three groups and filled with Thermafil, GuttaCore, or gutta percha, before post space preparation was performed. Teeth were scanned using micro-computed tomography after obturation, and again after post space preparation. Scans were examined for post space deviation, volume and linear deviation of post space preparation, and minimum root thickness before and after post space preparation. Data were analyzed with parametric and non-parametric statistical methods. Deviation occurred in eight teeth; seven from the Thermafil group (50%), one from the GuttaCore group (7%), and none from the gutta percha group. Deviation occurred statistically more often in the Thermafil group than in each of the other two groups (p < 0.05). The volume difference before and after post space preparation was statistically greater in the Thermafil group than in each of the other two groups (p < 0.05). Linear deviation of post space preparation was greater in the Thermafil group than in both of the other groups, and was statistically greater than that of the gutta percha group (p < 0.05). The minimum root thickness before post space preparation was significantly greater than it was after post space preparation for all groups (p < 0.01). There was no difference between the groups with respect to the difference in minimum root thickness before and after post space preparation. The differences in the number of samples showing post space deviation, volume, and linear deviation of post space preparation amongst the Thermafil, GuttaCore, and gutta percha groups were due to the presence or absence of a carrier as well as the different carrier materials.

Text

2014-12-18

Attribution-NonCommercial-NoDerivs 2.5 Canada

http://hdl.handle.net/2429/51594

Craniofacial Science

University of British Columbia

UBCV

http://creativecommons.org/licenses/by-nc-nd/2.5/ca/