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Eur J Dent. 2015 Jan-Mar;9(1):41-46. doi: 10.4103/1305-7456.149638.

The effects of different nickel-titanium instruments on dentinal microcrack formations during root canal preparation.

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1
Department of Endodontics, Faculty of Dentistry, Erciyes University, Kayseri, Turkiye.

Abstract

OBJECTIVE:

The aim of the present study was to investigate the incidence of dentinal microcracks caused by different preparation techniques.

MATERIALS AND METHODS:

120 extracted human mandibular incisor teeth were divided into five experimental groups and one control group (n = 20): Group 1: Hand preparation with balanced force technique up to #25 K-file. Group 2: Preparation with only ProTaper F2 instrument in a reciprocating movement. Group 3: Preparation with Reciproc R25 instrument in a reciprocating movement. Group 4: Preparation with ProTaper instruments up to F2 instrument. Group 5: Preparation with ProTaper Next instruments up to X2 instrument. No procedure was applied to control group. The roots were sectioned horizontally at 3, 6 and 9 mm from the apex and examined. Absence or presence of dentinal microcracks was noted.

RESULTS:

The Chi-square test was performed to compare the appearance of cracked roots between all groups. There were no significant differences among the groups (P > 0.05).

CONCLUSIONS:

In conclusion, except the hand file and control group, all experimental groups showed microcrack formations.

KEYWORDS:

Dentinal microcrack; ProTaper; Reciproc

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