Ultrasonic chemical vapor deposition-coated tip versus high- and low-speed carbide burs for apicoectomy: time required for resection and scanning electron microscopy analysis of the root-end surfaces.
This study compared ultrasonic chemical vapor deposition (CVD)-coated tip (CVDentus #8.1117-1; Clorovale Diamantes Ind. e Com. Ltda Epp, São José dos Campos, SP, Brazil) versus high-speed (#FG700L) and low-speed (#699) carbide burs for apicoectomy, evaluating the time required for resection and analyzing the root-end surfaces by scanning electron microscopy. Thirty extracted human premolars had the canals instrumented and obturated and were randomly assigned to 3 groups (n = 10), according to the instrument used for root-end resection. The time required for resection of the apical 2 mm of each root was recorded. The resected apical segments were dried, sputter coated with gold, and examined with a scanning electron microscope at x350 magnification. A four-point (0-3) scoring system was used to evaluate the apical surface smoothness. The results were analyzed statistically by the Kruskal-Wallis test, and two-by-two comparisons analyses were performed using the Miller test. The significance level was set at 5%. Root-end resection with the high-speed bur was significantly faster (p < 0.05) compared with the low-speed bur and CVD tip. The carbide burs produced significantly smoother root-end surfaces than the CVD tip (p < 0.05). The low-speed bur produced the smoothest root-end surfaces, whereas the roughest and most irregular root ends (p < 0.05) were obtained with the CVD tip. However, no statistically significant difference (p > 0.05) was found between the high- and low-speed burs regarding the surface roughness of the resected root ends (p > 0.05). In conclusion, under the tested conditions, ultrasonic root-end resection took a longer time and resulted in rougher surfaces compared with the use of carbide burs at both high and low speed.
Bernardes
Ricardo Affonso
RA
Department of Endodontics CPO SL Mandic, Brasiliense Dental School, Brasília, DF, Brazil. dr.ricardoaffonso@uol.com.br
de Souza Junior
José Villela
JV
Duarte
Marco Antonio Húngaro
MA
de Moraes
Ivaldo Gomes
IG
Bramante
Clovis Monteiro
CM
D001047:Apicoectomy / Q000295:instrumentation*; D001641:Bicuspid; D003762:Dental Instruments; D006801:Humans; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties; D013997:Time Factors; D017973:Tungsten Compounds; D014464:Ultrasonic Therapy / Q000295:instrumentation*; D014835:Volatilization
D017973:Tungsten Compounds; C002802:tungsten carbide