微型CT检测随机负荷疲劳试验后不同根管充填材料对牙根抗折性的影响

doi:10.13481/j.1671-587x.20200425

Abstract

Abstract: Objective: To detect the root crack after in vitro fatigue test with Micro-computed tomography(Micro-CT), and to explore the effects of two different root canal filling materials on the root flexure resistance. Methods: A total of 60 freshly extracted human single canal anterior teeth were randomly divided into control group (n=20),OrthoMTA group (n=20), and Gutta-Percha + AH-plus group (n=20). After removing the crowns of all samples, the root canals were prepared using the BLX nickel titanium system. The root canals in control group were not filled,the root canals in OrthoMTA group were filled with OrthoMTA root canal,and the root canals Gutta-Percha + AH-plus group were filled with Gutta-Percha and AH-plus sealant. All samples were placed in a mechanical cycler (500-1500 N, 2 Hz, with sinusoidal alternation and cycle 7 200 times),and the in vitro fatigue test was performed.Micro-CT was used to detect the internal cracks in the roots of each group and the crack severity scores were evaluated. Results: The results of Micro-CT scanning showed that after stress, most of the roots in control group, OrthoMTA group and Gutta-Percha+AH-plus group appeared the cracks of varying degrees, including incomplete cracks, complete cracks, and two types of cracks. Most of the cracks were in the near, far, and middle directions.The crack score of the root in OrthoMTA group was lower than that in control group, but the difference was not statistically significant (P>0.05). The crack score of the root in Gutta-Percha + AH-plus group was higher than that in control group, but the difference was not statistically significant (P>0.05); the crack score of the root in OrthoMTA group was lower than that in Gutta-Percha + AH-plus group, and the difference was not statistically significant (P>0.05). Conclusion: The random load fatigue test confirms that the in vitro resistance model is constructed successfully. Based on this study, OrthoMTA complete root canal filling and Gutta-Percha + AH-plus filling have no significant difference in influence in the root flexure resistance.

Key words: fatigue test, crack resistance, mineral trioxide aggregrate, Micro-computed tomography

CLC Number:

R781.3

ZHANG Li, QUAN Tao, LIU Dayong, JIA Zhi. Effects of different root canal filing materals on root flexure resistance after random load fatigue test detected by Micro-CT[J].Journal of Jilin University(Medicine Edition), 2020, 46(04): 822-827.

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Effects of different root canal filing materals on root flexure resistance after random load fatigue test detected by Micro-CT

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