3种机用镍钛锉根管预备对上颌第一磨牙应力的影响
|
摘要
目的比较3种机用镍钛锉根管预备对上颌第一磨牙应力大小和分布影响的差异。方法采用上颌第一磨牙树脂模型,分别用Reciproc、Wave One和Protaper机用镍钛根管锉进行根管预备。使用Micro-CT分别扫描预备前后的树脂模型,将扫描结果导入Mimics 16.0软件建立相应的三维模型,通过Abaqus 6.14有限元分析软件在垂直和侧方加载条件下进行应力分析。结果 3种机用镍钛根管锉根管预备后,在垂直力加载下,Reciproc组、Wave One组、Protaper组牙釉质最大应力增幅分别为1.36%、21.48%、20.99%;牙骨质最大应力增幅分别为55.98%、41.18%、33.04%;牙槽骨最大应力增幅分别为45.55%、40.37%、24.09%;在斜向45°力加载下,Reciproc组、Wave One组、Protaper组牙釉质最大应力增幅分别为1.79%、-4.58%、3.82%;牙骨质最大应力增幅分别为16.33%、7.58%、4.32%;牙槽骨最大应力增幅分别为46.82%、36.40%、8.29%。3种机用镍钛根管锉根管预备后,在相同的加载条件下,牙骨质和牙槽骨的最大应力均较预备前增大,应力集中区均位于牙冠与牙根交界区。3组在侧方加载时的应力均明显大于垂直加载时的应力。两种加载条件下,Reciproc组牙骨质和牙槽骨应力增大幅度均大于其余两组。结论根管预备会造成上颌第一磨牙应力增大,Reciproc组牙骨质和牙槽骨应力增大更明显。
Objective To compare the differences in the stress distribution in simulated first molars prepared with three rotary nickel-titanium instruments. Methods Four simulated first molars were prepared without instruments and with Reciproc, Wave One and Protaper. Before and after preparation, each simulated molar was scanned by Micro-CT.The data were imported to Mimics 16.0 software to establish three-dimensional models. Finite element analysis was processed with Abaqus 6.14 software under conditions of longitudinal and lateral load. Results Under vertical load conditions, the maximum von Mises stress of the enamel increased by 1.36%, 21.48% and 20.99% in the Reciproc, Wave One and Protaper groups, respectively, after preparation, while the maximum von Mises stress of the cementum increased by55.98%, 41.18% and 33.04%, respectively, and the maximum von Mises stress of the alveolar bone increased by45.55%, 40.37% and 24.09%, respectively. Under 45° lateral load conditions, the maximum von Mises stress of the enamel increased by 1.79%,-4.58% and 3.82% in the Reciproc, Wave One and Protaper groups, respectively, after preparation, while the maximum von Mises stress of cementum increased by 16.33%, 7.58% and 4.32%, respectively, and the maximum von Mises stress of the alveolar bone increased by 46.82%, 36.40% and 8.29%, respectively. Under the same conditions, the von Mises stresses of the cementum and alveolar bones of the simulated molars were higher after preparation than before preparation, especially under lateral load conditions. The stress was focused on the border between the crown and the root. The von Mises stress of the cementum and alveolar bones increased much more in the Reciproc group than in the other two groups under both conditions. Conclusion The von Mises stress of simulated molars was greater after preparation than before preparation. The von Mises stress of the cementum and alveolar bones increased much more in the Reciproc group than in the other two groups.
Objective To compare the differences in the stress distribution in simulated first molars prepared with three rotary nickel-titanium instruments. Methods Four simulated first molars were prepared without instruments and with Reciproc, Wave One and Protaper. Before and after preparation, each simulated molar was scanned by Micro-CT.The data were imported to Mimics 16.0 software to establish three-dimensional models. Finite element analysis was processed with Abaqus 6.14 software under conditions of longitudinal and lateral load. Results Under vertical load conditions, the maximum von Mises stress of the enamel increased by 1.36%, 21.48% and 20.99% in the Reciproc, Wave One and Protaper groups, respectively, after preparation, while the maximum von Mises stress of the cementum increased by55.98%, 41.18% and 33.04%, respectively, and the maximum von Mises stress of the alveolar bone increased by45.55%, 40.37% and 24.09%, respectively. Under 45° lateral load conditions, the maximum von Mises stress of the enamel increased by 1.79%,-4.58% and 3.82% in the Reciproc, Wave One and Protaper groups, respectively, after preparation, while the maximum von Mises stress of cementum increased by 16.33%, 7.58% and 4.32%, respectively, and the maximum von Mises stress of the alveolar bone increased by 46.82%, 36.40% and 8.29%, respectively. Under the same conditions, the von Mises stresses of the cementum and alveolar bones of the simulated molars were higher after preparation than before preparation, especially under lateral load conditions. The stress was focused on the border between the crown and the root. The von Mises stress of the cementum and alveolar bones increased much more in the Reciproc group than in the other two groups under both conditions. Conclusion The von Mises stress of simulated molars was greater after preparation than before preparation. The von Mises stress of the cementum and alveolar bones increased much more in the Reciproc group than in the other two groups.
引文
[1]PedullàE,Genovesi F,Rapisarda S,et al.Effects of 6 single-file systems on dentinal crack formation[J].J Endod,2017,43(3):456-461.
[2]Miguéns-Vila R,Martín-Biedma B,Varela-Pati?o P,et al.Vertical root fracture initiation in curved roots after root canal preparation:a dentinal micro-crack analysis with LED transillumination[J].J Clin Exp Dent,2017,9(10):1218-1223.
[3]陈君,岳林,王嘉德,等.根管扩大程度与牙根强度和应力分布的关系[J].中华口腔医学杂志,2006,41(11):661-663.
[4]De-Deus G,Moreira EJ,Lopes HP,et al.Extended cyclic fatigue life of F2 Protaper instruments used in reciprocating movement[J].Int Endod J,2010,43(12):1063-1068.
[5]Bürklein S,Hinschitza K,Dammaschke T,et al.Shaping ability and cleaning effectiveness of two single-file systems in severely curved of root canals of extracted teeth:Reciproc and Wave One versus Mtwo and Protaper[J].Int Endod J,2012,45(5):449-461.
[6]仇晓慧,徐海,张光东.显微CT在牙体牙髓病学研究中的应用[J].口腔医学,2017,37(11):1049-1052.
[7]Rhodes JS,Ford TR,Lynch JA,et al.Micro-computed tomography:a new tool for experimental endodontology[J].Int Endod J,1999,32(3):165-170.
[8]黄宇文.有限元分析在口腔生物力学中的应用[J].中国组织工程研究,2012,16(13):2423-2426.
[9]赵铱民.口腔修复学[M].7版.北京:人民卫生出版社,2012:151.
[10]李群,王超,郑玉琪,等.牙本质微裂纹对牙体应力影响的三维有限元研究[J].第三军医大学学报,2017,39(14):1476-1480.
[11]Maia Filho EM,Dos Reis Santos RM,Lima DM,et al.Shaping ability of Pro Taper Next,Wave One,and Reciproc in simulated root canals[J].J Contemp Dent Pract,2016,17(11):902-906.
[12]Bane K,Faye B,Sarr M,et al.Root canal shaping by single-file systems and rotary instruments:a laboratory study[J].Iran Endod J,2015,10(2):135-139.
[13]Ko?ak MM,Ko?ak S,Türker SA,et al.Cleaning efficacy of reciprocal and rotary systems in the removal of root canal filling material[J].J Conserv Dent,2016,19(2):184-188.
[14]Kherlakian D,Cunha RS,Ehrhardt IC,et al.Comparison of the incidence of postoperative pain after using 2 reciprocating systems and a continuous rotary system:a prospective randomized clinical trial[J].J Endod,2016,42(2):171-176.
[15]Top?uoglu HS,Düzgün S,Akpek F,et al.Effect of glide path and apical preparation size on the incidence of apical crack during the canal preparation using Reciproc,Wave One,and Pro Taper Next systems in curved root canals:a stereomicroscope study[J].Scanning,2016,38(6):585-590.
[16]Pawar AM,Barfiwala D,Pawar MA,et al.Assessment of the fracture resistance of teeth instrumented using 2 rotary and 2 reciprocating files versus the self-adjusting file(SAF):an ex vivo comparative study on mandibular premolars[J].J Conserv Dent,2016,19(2):138-142.
[17]钟先瑜,徐佳蕊,张理红,等.牙周吸收情况下上颌切牙的三维有限元分析[J].广东牙病防治,2015,23(12):647-650
[18]Wei X,Hu B,Peng H,et al.The incidence of dentinal cracks during root canal preparations with reciprocating single-file and rotary-file systems:a meta-analysis[J].Dent Mater J,2017,36(3):243-252.
[2]Miguéns-Vila R,Martín-Biedma B,Varela-Pati?o P,et al.Vertical root fracture initiation in curved roots after root canal preparation:a dentinal micro-crack analysis with LED transillumination[J].J Clin Exp Dent,2017,9(10):1218-1223.
[3]陈君,岳林,王嘉德,等.根管扩大程度与牙根强度和应力分布的关系[J].中华口腔医学杂志,2006,41(11):661-663.
[4]De-Deus G,Moreira EJ,Lopes HP,et al.Extended cyclic fatigue life of F2 Protaper instruments used in reciprocating movement[J].Int Endod J,2010,43(12):1063-1068.
[5]Bürklein S,Hinschitza K,Dammaschke T,et al.Shaping ability and cleaning effectiveness of two single-file systems in severely curved of root canals of extracted teeth:Reciproc and Wave One versus Mtwo and Protaper[J].Int Endod J,2012,45(5):449-461.
[6]仇晓慧,徐海,张光东.显微CT在牙体牙髓病学研究中的应用[J].口腔医学,2017,37(11):1049-1052.
[7]Rhodes JS,Ford TR,Lynch JA,et al.Micro-computed tomography:a new tool for experimental endodontology[J].Int Endod J,1999,32(3):165-170.
[8]黄宇文.有限元分析在口腔生物力学中的应用[J].中国组织工程研究,2012,16(13):2423-2426.
[9]赵铱民.口腔修复学[M].7版.北京:人民卫生出版社,2012:151.
[10]李群,王超,郑玉琪,等.牙本质微裂纹对牙体应力影响的三维有限元研究[J].第三军医大学学报,2017,39(14):1476-1480.
[11]Maia Filho EM,Dos Reis Santos RM,Lima DM,et al.Shaping ability of Pro Taper Next,Wave One,and Reciproc in simulated root canals[J].J Contemp Dent Pract,2016,17(11):902-906.
[12]Bane K,Faye B,Sarr M,et al.Root canal shaping by single-file systems and rotary instruments:a laboratory study[J].Iran Endod J,2015,10(2):135-139.
[13]Ko?ak MM,Ko?ak S,Türker SA,et al.Cleaning efficacy of reciprocal and rotary systems in the removal of root canal filling material[J].J Conserv Dent,2016,19(2):184-188.
[14]Kherlakian D,Cunha RS,Ehrhardt IC,et al.Comparison of the incidence of postoperative pain after using 2 reciprocating systems and a continuous rotary system:a prospective randomized clinical trial[J].J Endod,2016,42(2):171-176.
[15]Top?uoglu HS,Düzgün S,Akpek F,et al.Effect of glide path and apical preparation size on the incidence of apical crack during the canal preparation using Reciproc,Wave One,and Pro Taper Next systems in curved root canals:a stereomicroscope study[J].Scanning,2016,38(6):585-590.
[16]Pawar AM,Barfiwala D,Pawar MA,et al.Assessment of the fracture resistance of teeth instrumented using 2 rotary and 2 reciprocating files versus the self-adjusting file(SAF):an ex vivo comparative study on mandibular premolars[J].J Conserv Dent,2016,19(2):138-142.
[17]钟先瑜,徐佳蕊,张理红,等.牙周吸收情况下上颌切牙的三维有限元分析[J].广东牙病防治,2015,23(12):647-650
[18]Wei X,Hu B,Peng H,et al.The incidence of dentinal cracks during root canal preparations with reciprocating single-file and rotary-file systems:a meta-analysis[J].Dent Mater J,2017,36(3):243-252.