不同镍钛系统结合触控启动技术预备模拟弯曲根管的成形效果研究

doi:10.3877/cma.j.issn.1674-1366.2021.01.002

中华口腔医学研究杂志(电子版) ›› 2021, Vol. 15 ›› Issue (01) : 6 -12. doi: 10.3877/cma.j.issn.1674-1366.2021.01.002

所属专题：文献；

基础研究

不同镍钛系统结合触控启动技术预备模拟弯曲根管的成形效果研究

曾凯密¹, 韦曦², 黄湘雅², 伍婉翠³^,^†(

)

^1. 南方医科大学口腔医院，广州　510280
^2. 中山大学附属口腔医院，光华口腔医学院，广东省口腔医学重点实验室，广州　510055
^3. 广州医科大学附属第二医院口腔科　510260

收稿日期:2020-08-31 出版日期:2021-02-01
通信作者: 伍婉翠

Shaping ability of four different NiTi rotary systems with tactile controlled activation technique in simulated curved canals

Kaimi Zeng¹, Xi Wei², Xiangya Huang², Wancui Wu³^,^†()

^1. Stomatological Hospital, Southern Medical University, Guangzhou 510280, China
^2. Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangdong Provincal Key Laboratory of Stomatology, Guangzhou 510055, China
^3. Department of Stomatology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, China

Received:2020-08-31 Published:2021-02-01
Corresponding author: Wancui Wu
Supported by:
Health and Family Planning Technology General Guidance Project of Guangzhou(20181A011065)

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引用本文：

曾凯密, 韦曦, 黄湘雅, 伍婉翠. 不同镍钛系统结合触控启动技术预备模拟弯曲根管的成形效果研究[J]. 中华口腔医学研究杂志(电子版), 2021, 15(01): 6-12.

Kaimi Zeng, Xi Wei, Xiangya Huang, Wancui Wu. Shaping ability of four different NiTi rotary systems with tactile controlled activation technique in simulated curved canals[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2021, 15(01): 6-12.

目的

评价HyFlex CM（HF）、TFA、Vortex Blue（VB）和Mtwo共4种镍钛系统结合触控启动（TCA）技术和传统技术（TT）预备模拟弯曲根管的成形效果。

方法

将96个模拟弯曲根管按照预备器械HF、TFA、VB、Mtwo采用随机数字表法分为4个大组（每组24个），每个大组再按照预备技术（TT或TCA）采用随机数字表法分为2个亚组（每组12个）。各组采用对应镍钛系统及技术预备根管。体视显微镜拍照记录预备前及预备后根管图像。AutoCAD、Adobe Photoshop CS5及Image J软件对预备前、后根管图像进行处理，测量距根尖每隔1 mm处的根管内外侧壁预备量，共测量11个位点，按照距根尖孔距离依次编号为D0 ~ D10，计算各位点根管偏移量。采用两独立样本t检验分析比较各镍钛系统两种预备技术的根管偏移情况，采用单因素方差分析（One-Way ANOVA）比较同一预备技术下4种镍钛系统根管偏移情况，并采用Bonferroni法进行两两比较。

结果

与TT法相比，采用TCA法显著减小了HF在D0 ~ D2位点（t_D0 = 2.701，P_D0 = 0.013；t_D1 = 3.497，P_D1 = 0.002；t_D2 = 2.731，P_D2 = 0.012），TFA在D2、D5和D6位点（t_D2 = 2.303，P_D2 = 0.031；t_D5 = 4.500，P_D5<0.001；t_D6 = 2.102，P_D6 = 0.047），VB在D6、D7和D10位点（t_D6 = 3.562，P_D6 = 0.002；t_D7 = 3.589，P_D7 = 0.002；t_D10 = 3.004，P_D10 = 0.007）和Mtwo在D4 ~ D6、D10位点（t_D4 = 4.668，P_D4<0.001；t_D5 = 5.645，P_D5<0.001；t_D6 = 3.627，P_D6 = 0.001；t_D10 = 5.778，P_D10<0.001）的根管偏移。对4种镍钛系统成形能力进行比较，不同预备技术下Mtwo在D3 ~ D8位点的根管偏移量均显著大于其他3种镍钛系统（P<0.05）；TT法中，VB在D6、D7位点的根管偏移量较HF和TFA大（P<0.05）；TCA法中，VB在D4 ~ D6位点的根管偏移量较HF和TFA大（P<0.05）；TFA和HF组仅在TT法中的D1位点差异有统计学意义（P<0.05），其余位点差异均无统计学意义（P>0.05）。

结论

HF、TFA、VB和Mtwo结合TCA法预备弯曲根管具有良好的成形效果。

关键词: 根管制备, 牙髓腔, 弯曲, 触控启动技术, 成形能力, HyFlex CM, TFA, Vortex Blue, Mtwo

Objective

To evaluate the shaping ability of four NiTi rotary systems HyFlex CM (HF) , TFA, Vortex Blue (VB) and Mtwo combined with Tactile Controlled Activation (TCA) technique or traditional technique (TT) when preparing simulated curved canals.

Methods

Ninety-six simulated curved canals were assigned to four groups (n = 24 each) according to different NiTi rotary systems (HF, TFA, VB and Mtwo) using a random number table method. Each group was divided into two subgroups based on instrumentation technique (TT or TCA) (n = 12 each) . The simulated curved canals in each group were instrumented by using the corresponding rotary system and technique. Pre- and postoperative canal images were obtained using the stereoscopic microscope. AutoCAD, Adobe Photoshop CS5 and Image J were used for image processing. Eleven points were arranged in 1 mm steps from apex and numbered sequentially as D0-D10. The material removal from the inner and outer canal walls at each points were measured and canal transportation were calculated accordingly. The shaping ability of two techniques was analyzed using independent t-test. The shaping ability of four rotary systems was analyzed using One-Way ANOVA followed by Bonferroni test for a multiple comparison procedure.

Results

Compared with TT, TCA technique reduced root canal transportation caused by HF at D0-D2 points (t_D0 = 2.701, P_D0 = 0.013; t_D1 = 3.497, P_D1 = 0.002; t_D2 = 2.731, P_D2 = 0.012) , TFA at D2, D5 and D6 points (t_D2 = 2.303, P_D2 = 0.031; t_D5 = 4.500, P_D5<0.001; t_D6 = 2.102, P_D6 = 0.047) , VB at D6, D7 and D10 points (t_D6 = 3.562, P_D6 = 0.002; t_D7 = 3.589, P_D7 = 0.002; t_D10 = 3.004, P_D10 = 0.007) and Mtwo at D4-D6 and D10 points (t_D4 = 4.668, P_D4<0.001; t_D5 = 5.645, P_D5<0.001; t_D6 = 3.627, P_D6 = 0.001; t_D10 = 5.778, P_D10<0.001) . Comparing the shaping ability of four NiTi rotary systems combined with the same technique, the results showed that Mtwo produced more canal transportation at D3-D8 points than other three systems (P<0.05) ; VB produced more transportation at D6 and D7 points of TT group and at D4-D6 points of TCA group than TFA and HF (P<0.05) ; No significant difference was found between HF and TFA except D1 point of TCA group (P<0.05) .

Conclusion

Under the conditions of this study, HF, TFA, VB and Mtwo combined with TCA were demonstrated excellent shaping ability when preparing curved root canals.

Key words: Root canal preparation, Dental pulp cavity, curved, Tactile controlled activation, Shaping ability, HyFlex CM, TFA, Vortex Blue, Mtwo

表1 4种镍钛系统根管预备程序

镍钛系统	根管预备程序
HF	25/.08预备至10.5 mm
	15/.04、20/.04、25/.04、30/.04、35/.04预备至15.5 mm
TFA	20/.04、25/.06、35/.04预备至15.5 mm
VB	15/.04、20/.04、25/.04、30/.04、35/.04预备至15.5 mm
Mtwo	10/.04、15/.05、20/.06、25/.06、30/.05、35/.04预备至15.5 mm

表1 4种镍钛系统根管预备程序

镍钛系统	根管预备程序
HF	25/.08预备至10.5 mm
	15/.04、20/.04、25/.04、30/.04、35/.04预备至15.5 mm
TFA	20/.04、25/.06、35/.04预备至15.5 mm
VB	15/.04、20/.04、25/.04、30/.04、35/.04预备至15.5 mm
Mtwo	10/.04、15/.05、20/.06、25/.06、30/.05、35/.04预备至15.5 mm

图1 树脂根管预备前、后根管影像重叠图片及根管偏移量测量方法示意图　A：灰绿色为预备前的根管影像，白色为预备后的根管影像，白色线条为距根尖每隔1 mm的位点的垂线；B：A图中红色方框放大，a为根管弯曲外侧壁的预备量，b为根管弯曲内侧壁的预备量，根管偏移量=|a-b|

图2 不同镍钛系统结合不同技术预备弯曲根管的根管偏移情况比较　A：HF；B：TFA；C：VB；D：Mtwo；HF为HyFlex CM；VB为Vortex Blue；TT为传统技术；TCA为触控启动技术；该位点两种技术间差异具有统计学意义（^aP<0.05）

表2 镍钛系统结合传统技术（TT）预备弯曲根管的根管偏移情况（ ± s，mm）

镍钛系统	例数	D0	D1	D2	D3	D4	D5
HF	12	0.108 ± 0.053^a	0.038 ± 0.017^a	0.033 ± 0.019^a	0.021 ± 0.024^a	0.018 ± 0.022^a	0.034 ± 0.022^a
TFA	12	0.069 ± 0.036^a	0.015 ± 0.007^b	0.020 ± 0.014^a	0.016 ± 0.012^a	0.017 ± 0.017^a	0.049 ± 0.019^ab
VB	12	0.074 ± 0.053^a	0.025 ± 0.017^ab	0.028 ± 0.019^a	0.029 ± 0.024^a	0.034 ± 0.022^a	0.081 ± 0.022^b
Mtwo	12	0.120 ± 0.072^a	0.022 ± 0.017^ab	0.030 ± 0.012^a	0.066 ± 0.037^b	0.147 ± 0.037^b	0.206 ± 0.045^c
F值		2.707	4.923	1.691	10.074	75.786	79.225
P值		0.057	0.005	0.183	<0.001	<0.001	<0.001
镍钛系统	例数	D6	D7	D8	D9	D10
HF	12	0.040 ± 0.024^a	0.034 ± 0.025^a	0.032 ± 0.014^a	0.025 ± 0.023^a	0.039 ± 0.044^a
TFA	12	0.051 ± 0.026^a	0.035 ± 0.024^a	0.022 ± 0.016^a	0.033 ± 0.023^a	0.059 ± 0.026^ab
VB	12	0.101 ± 0.024^b	0.069 ± 0.025^b	0.018 ± 0.014^a	0.036 ± 0.023^a	0.091 ± 0.044^b
Mtwo	12	0.202 ± 0.041^c	0.140 ± 0.037^c	0.069 ± 0.038^b	0.036 ± 0.031^a	0.155 ± 0.041^c
F值		72.197	36.942	11.806	0.524	23.568
P值		<0.001	<0.001	<0.001	0.668	<0.001

表2 镍钛系统结合传统技术（TT）预备弯曲根管的根管偏移情况（ ± s，mm）

镍钛系统	例数	D0	D1	D2	D3	D4	D5
HF	12	0.108 ± 0.053^a	0.038 ± 0.017^a	0.033 ± 0.019^a	0.021 ± 0.024^a	0.018 ± 0.022^a	0.034 ± 0.022^a
TFA	12	0.069 ± 0.036^a	0.015 ± 0.007^b	0.020 ± 0.014^a	0.016 ± 0.012^a	0.017 ± 0.017^a	0.049 ± 0.019^ab
VB	12	0.074 ± 0.053^a	0.025 ± 0.017^ab	0.028 ± 0.019^a	0.029 ± 0.024^a	0.034 ± 0.022^a	0.081 ± 0.022^b
Mtwo	12	0.120 ± 0.072^a	0.022 ± 0.017^ab	0.030 ± 0.012^a	0.066 ± 0.037^b	0.147 ± 0.037^b	0.206 ± 0.045^c
F值		2.707	4.923	1.691	10.074	75.786	79.225
P值		0.057	0.005	0.183	<0.001	<0.001	<0.001
镍钛系统	例数	D6	D7	D8	D9	D10
HF	12	0.040 ± 0.024^a	0.034 ± 0.025^a	0.032 ± 0.014^a	0.025 ± 0.023^a	0.039 ± 0.044^a
TFA	12	0.051 ± 0.026^a	0.035 ± 0.024^a	0.022 ± 0.016^a	0.033 ± 0.023^a	0.059 ± 0.026^ab
VB	12	0.101 ± 0.024^b	0.069 ± 0.025^b	0.018 ± 0.014^a	0.036 ± 0.023^a	0.091 ± 0.044^b
Mtwo	12	0.202 ± 0.041^c	0.140 ± 0.037^c	0.069 ± 0.038^b	0.036 ± 0.031^a	0.155 ± 0.041^c
F值		72.197	36.942	11.806	0.524	23.568
P值		<0.001	<0.001	<0.001	0.668	<0.001

表3 镍钛系统结合触控启动技术（TCA）预备弯曲根管的根管偏移情况（ ± s，mm）

镍钛系统	例数	D0	D1	D2	D3	D4	D5
HF	12	0.064 ± 0.034^ab	0.017 ± 0.011^ab	0.018 ± 0.012^ab	0.017 ± 0.013^a	0.023 ± 0.020^a	0.032 ± 0.023^a
TFA	12	0.046 ± 0.026^a	0.010 ± 0.007^a	0.009 ± 0.009^a	0.009 ± 0.008^ab	0.013 ± 0.009^a	0.019 ± 0.013^a
VB	12	0.092 ± 0.038^b	0.024 ± 0.016^b	0.028 ± 0.014^b	0.028 ± 0.014^ac	0.046 ± 0.017^b	0.070 ± 0.027^b
Mtwo	12	0.090 ± 0.030^b	0.015 ± 0.011^ab	0.033 ± 0.021^b	0.056 ± 0.022^d	0.087 ± 0.024^c	0.121 ± 0.027^c
F值		5.475	3.010	6.628	21.568	38.180	46.676
P值		0.003	0.040	0.001	<0.001	<0.001	<0.001
镍钛系统	例数	D6	D7	D8	D9	D10
HF	12	0.029 ± 0.022^a	0.023 ± 0.013^a	0.025 ± 0.014^a	0.032 ± 0.029^a	0.037 ± 0.031^a
TFA	12	0.029 ± 0.023^a	0.027 ± 0.023^a	0.036 ± 0.018^a	0.048 ± 0.029^a	0.054 ± 0.034^a
VB	12	0.071 ± 0.015^b	0.036 ± 0.019^a	0.022 ± 0.016^a	0.035 ± 0.029^a	0.043 ± 0.034^a
Mtwo	12	0.146 ± 0.034^c	0.108 ± 0.042^b	0.065 ± 0.037^b	0.037 ± 0.020^a	0.054 ± 0.044^a
F值		60.236	27.175	8.585	0.799	0.615
P值		<0.001	<0.001	<0.001	0.501	0.609

表3 镍钛系统结合触控启动技术（TCA）预备弯曲根管的根管偏移情况（ ± s，mm）

镍钛系统	例数	D0	D1	D2	D3	D4	D5
HF	12	0.064 ± 0.034^ab	0.017 ± 0.011^ab	0.018 ± 0.012^ab	0.017 ± 0.013^a	0.023 ± 0.020^a	0.032 ± 0.023^a
TFA	12	0.046 ± 0.026^a	0.010 ± 0.007^a	0.009 ± 0.009^a	0.009 ± 0.008^ab	0.013 ± 0.009^a	0.019 ± 0.013^a
VB	12	0.092 ± 0.038^b	0.024 ± 0.016^b	0.028 ± 0.014^b	0.028 ± 0.014^ac	0.046 ± 0.017^b	0.070 ± 0.027^b
Mtwo	12	0.090 ± 0.030^b	0.015 ± 0.011^ab	0.033 ± 0.021^b	0.056 ± 0.022^d	0.087 ± 0.024^c	0.121 ± 0.027^c
F值		5.475	3.010	6.628	21.568	38.180	46.676
P值		0.003	0.040	0.001	<0.001	<0.001	<0.001
镍钛系统	例数	D6	D7	D8	D9	D10
HF	12	0.029 ± 0.022^a	0.023 ± 0.013^a	0.025 ± 0.014^a	0.032 ± 0.029^a	0.037 ± 0.031^a
TFA	12	0.029 ± 0.023^a	0.027 ± 0.023^a	0.036 ± 0.018^a	0.048 ± 0.029^a	0.054 ± 0.034^a
VB	12	0.071 ± 0.015^b	0.036 ± 0.019^a	0.022 ± 0.016^a	0.035 ± 0.029^a	0.043 ± 0.034^a
Mtwo	12	0.146 ± 0.034^c	0.108 ± 0.042^b	0.065 ± 0.037^b	0.037 ± 0.020^a	0.054 ± 0.044^a
F值		60.236	27.175	8.585	0.799	0.615
P值		<0.001	<0.001	<0.001	0.501	0.609

[1]	Peters OA. Current challenges and concepts in the preparation of root canal systems：a review[J]. J Endod，2004，30(8):559-567. DOI：10.1097/01.don.0000129039.59003.9d.
[2]	Chaniotis A，Filippatos C. Root canal treatment of a dilacerated mandibular premolar using a novel instrumentation approach. A case report[J]. Int Endod J，2017，50(2):202-211. DOI：10.1111/iej.12610.
[3]	Chaniotis A，Filippatos CG. The Use of a Novel Approach for the Instrumentation of a Cone-beam Computed Tomography-discernible Lateral Canal in an Unusual Maxillary Incisor：Case Report[J]. J Endod，2017，43(6):1023-1027. DOI：10.1016/j.joen.2017.01.032.
[4]	Young GR，Parashos P，Messer HH. The principles of techniques for cleaning root canals[J]. Aust Dent J，2007，52(1 Suppl):S52-S63. DOI：10.1111/j.1834-7819.2007.tb00526.x.
[5]	Schafer E，Dammaschke T. Development and sequelae of canal transportation[J]. Endodontic Topics，2009，15(1):75-90. DOI：10.1111/j.1601-1546.2009.00236.x.
[6]	樊明文.牙体牙髓病学[M]. 4版.北京：人民卫生出版社，2012：302.
[7]	Pereira ES，Gomes RO，Leroy AM，et al. Mechanical behavior of M-Wire and conventional NiTi wire used to manufacture rotary endodontic instruments[J]. Dent Mater，2013，29(12):e318-e324. DOI：10.1016/j.dental.2013.10.004.
[8]	Shen Y，Riyahi AM，Campbell L，et al. Effect of a combination of torsional and cyclic fatigue preloading on the fracture behavior of K3 and K3XF instruments[J]. J Endod，2015，41(4):526-530. DOI：10.1016/j.joen.2014.10.008.
[9]	Goo HJ，Kwak SW，Ha JH，et al. Mechanical Properties of Various Heat-treated Nickel-titanium Rotary Instruments[J]. J Endod，2017，43(11):1872-1877. DOI：10.1016/j.joen.2017.05.025.
[10]	杨殷杰，侯本祥，侯晓玫.三种特殊热处理技术对镍钛根管锉相变行为、弯曲性能和抗疲劳折断性能影响的研究[J].中华口腔医学杂志，2018，53(8):539-545. DOI：10.3760/cma.j.issn.1002-0098.2018.08.008
[11]	Zupanc J，Vahdat-Pajouh N，Schäfer E. New thermomechanically treated NiTi alloys - a review[J]. Int Endod J，2018，51(10):1088-1103. DOI：10.1111/iej.12924.
[12]	Hargreaves KM，Cohen S. Cohen′s Pathways of the Pulp[M]. 10th ed. St. Louis，Mo.：Mosby Elsevier，2011：233.
[13]	Li UM，Lee BS，Shih CT，et al. Cyclic fatigue of endodontic nickel titanium rotary instruments：static and dynamic tests[J]. J Endod，2002，28(6):448-451. DOI：10.1097/00004770-200206000-00007.
[14]	Jeon HJ，Paranjpe A，Ha JH，et al. Apical enlargement according to different pecking times at working length using reciprocating files[J]. J Endod，2014，40(2):281-284. DOI：10.1016/j.joen.2013.08.020.
[15]	Montalvão D，Alçada FS，Braz FF，et al. Structural characterisation and mechanical FE analysis of conventional and M-Wire Ni-Ti alloys used in endodontic rotary instruments[J]. Scientific World J，2014，2014:976459. DOI：10.1155/2014/976459.
[16]	Wu H，Peng C，Bai Y，et al. Shaping ability of ProTaper Universal，WaveOne and ProTaper Next in simulated L-shaped and S-shaped root canals[J]. BMC Oral Health，2015，15:27. DOI：10.1186/s12903-015-0012-z.
[17]	Zhao D，Shen Y，Peng B，et al. Micro-computed tomography evaluation of the preparation of mesiobuccal root canals in maxillary first molars with Hyflex CM，Twisted Files，and K3 instruments[J]. J Endod，2013，39(3):385-388. DOI：10.1016/j.joen.2012.11.030.
[18]	郭宇，彭彬. 3种不同镍钛器械对弯曲根管成形能力的研究[J].口腔医学研究，2014，30(4):340-342. DOI：10.13701/j.cnki.kqyxyj.2014.04.017
[19]	Rejula F，Christalin R，Ahmed W，et al. Measure and compare the Degree of Root Canal Transportation and Canal-centering ability of Twisted，ProTaper，and Conventional Stainless Steel K Files using Spiral Computed Tomography：An in vitro Study[J]. J Contemp Dent Pract，2017，18(6):463-469. DOI：10.5005/jpjournals-10024-2066.
[20]	Zhang Y，Liu J，Gu Y，et al. Analysis of second mesiobuccal root canal instrumentation in maxillary first molars with three nickel-titanium rotary instruments：a micro-computed tomographic study[J]. Odontology，2020. DOI：10.1007/s10266-020-00564-2.
[21]	Pedulla E，Plotino G，Grande NM，et al. Shaping ability of two nickel-titanium instruments activated by continuous rotation or adaptive motion：a micro-computed tomography study[J]. Clin Oral Investig，2016，20(8):2227-2233. DOI：10.1007/s00784-016-1732-4.
[22]	孙菲，梁景平.不同镍钛根管预备器械去除重度弯曲根管内充填物的效果比较[J].口腔疾病防治，2019，27(10):627-633. DOI：10.12016/j.issn.2096-1456.2019.10.003.
[23]	Marceliano-Alves MF，Sousa-Neto MD，Fidel SR，et al. Shaping ability of single-file reciprocating and heat-treated multifile rotary systems：a micro-CT study[J]. Int Endod J，2015，48(12):1129-1136. DOI：10.1111/iej.12412.
[24]	Kumar BS，Pattanshetty S，Prasad M，et al. An in-vitro Evaluation of canal transportation and centering ability of two rotary Nickel Titanium systems（Twisted Files and Hyflex files）with conventional stainless Steel hand K-flexofiles by using Spiral Computed Tomography[J]. J Int Oral Health，2013，5(5):108-115.

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Shaping ability of four different NiTi rotary systems with tactile controlled activation technique in simulated curved canals

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Shaping ability of four different NiTi rotary systems with tactile controlled activation technique in simulated curved canals