Int J Stomatol

Int J Stomatol ›› 2019, Vol. 46 ›› Issue (5): 503-508.doi: 10.7518/gjkq.2019084

• Conservative Dentistry and Endodontics • Previous Articles     Next Articles

Comparison of apical and coronal extrusions with the use of four kinds of engine-driven instrumentation systems

Lu Yan(),Wu Bin,Yan Hui   

  1. Dept. of Stomatology, Tianjin Nankai Hosipital, Tianjin 300100, China
  • Received:2019-01-18 Revised:2019-05-08 Online:2019-09-01 Published:2019-09-10
  • Contact: Yan Lu E-mail:dentist_luyan@163.com

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Abstract:

Objective The aim of this study is to quantitatively compare the apical and coronal extrusions of two single-file reciprocating systems (Reciproc and WaveOne) and two full-sequence rotaries (M3 and ProTaper) to decrease the flare-up and increase the comfort during the root canal treatment. Methods Eighty extracted mandibular anterior teeth were randomly assigned to four groups. The root canals were instrumented with Reciproc, WaveOne, M3 and ProTaper instruments, respectively. The apical and coronal extrusions were measured and analyzed using SPSS 17.0. Results Reciproc and WaveOne instruments produced significantly less apical extrusions than M3 and ProTaper instruments (P<0.05). However, there was no statistically significant difference in coronal extrusion (P>0.05). There was no statistically significant relationship between apical and coronal extrusions (P>0.05). The working length (WL) was negatively correlated with the coronal extrusion (P<0.05), but no significant relationship with the apical extrusion (P>0.05) was evident. Conclusion All of the systems caused apical extrusion during the root canal instrumentation. The use of reciprocating single-file systems resulted in less apical extrusion of debris than full-sequence rotary instruments.

Key words: root canal instrumentation, flare-up, Reciproc, WaveOne, apical extrusion, coronal extrusion

CLC Number: 

  • R781.33

TrendMD: 

Fig 1

Experimental model of the device for collecting apical extrusion"

Fig 2

Experimental model of the device for collecting coronal extrusion"

Tab 1

Diameter of the apical foramen and taper of the root canal after root canal instrumentation"

组别 样本数 根尖孔直径/mm 根管锥度
Reciproc 20 0.25 0.08
WaveOne 20 0.25 0.08
M3 20 0.25 0.06
ProTaper 20 0.25 0.08

Fig 3

Eppendorf tubules for collecting apical extrusion"

Fig 4

Eppendorf tubules for collecting coronal extrusion"

Tab 2

Comparison of apical extrusion and coronal extrusion in four groups $\bar{x}$±s"

分组 n 根尖推出量/g 冠方带出量/g WL/mm
Reciproc 20 0.002 50±0.001 52 0.011 19±0.001 29 20.725 0±2.425 1
WaveOne 20 0.002 19±0.001 45 0.010 53±0.001 02 21.050 0±1.723 7
M3 20 0.004 69±0.001 53 0.010 84±0.001 06 20.325 0±2.040 9
ProTaper 20 0.004 86±0.002 16 0.011 51±0.002 47 20.500 0±1.986 8

Tab 3

P values among the four groups of root canal instrumentation systems"

组间比较 根尖推出量 冠方带出量 WL
Reciproc与WaveOne 0.561 0.191 0.619
Reciproc与M3 <0.001* 0.486 0.541
Reciproc与ProTaper <0.001* 0.521 0.731
WaveOne与M3 <0.001* 0.537 0.269
WaveOne与ProTaper <0.001* 0.053 0.401
M3与ProTaper 0.752 0.183 0.789

Tab 4

Correlation analysis of apical extrusion, coronal extrusion and working length"

组间比较 相关系数r P值
根尖推出量与冠方带出量 0.201 0.074
根尖推出量与WL -0.209 0.063
冠方带出量与WL -0.235 0.036*
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