中国组织工程研究

中国组织工程研究 ›› 2011, Vol. 15 ›› Issue (17): 3143-3147.doi: 10.3969/j.issn.1673-8225.2011.17.025

• 数字化骨科 digital orthopedics • 上一篇    下一篇

三维有限元分析前牙薄弱根管重塑后的桩核冠修复

陈  蕾1，朱毅男2   

  1. 1中南大学附属湘雅医院口腔科，湖南省长沙市410008
    2长沙市口腔医院修复科，湖南省长沙市410005
  • 收稿日期:2010-12-01 修回日期:2011-03-17 出版日期:2011-04-23 发布日期:2011-04-23
  • 通讯作者: 朱毅男，硕士，医师，长沙市口腔医院修复科，湖南省长沙市 410005 wy8874881@126.com
  • 作者简介:陈蕾★，女，浙江省鄞县人，汉族，华西医科大学毕业，硕士，教授，主要从事口腔修复学方面的研究。 chenleidt@163.com
  • 基金资助:

    湖南自然科学基金课题(09JJ3029)。

Three-dimensional finite element analysis of incisor flared root canal after repair with post-core system crown

Chen Lei1, Zhu Yi-nan2   

  1. 1Department of Stomatology of Xiangya Hospital, Central South University, Changsha 410008, Hunan Province, China
    2Department of Prosthodontics, Changsha Hospital of Stomatology, Changsha  410005, Hunan Province, China
  • Received:2010-12-01 Revised:2011-03-17 Online:2011-04-23 Published:2011-04-23
  • Contact: Zhu Yi-nan, Master, Physician, Department of Prosthodontics, Changsha Hospital of Stomatology, Changsha 410005, Hunan Province, China wy8874881@126.com
  • About author:Chen Lei★, Master, Professor, Department of Stomatology of Xiangya Hospital, Central South University, Changsha 410008, Hunan Province, China chenleidt@163.com
  • Supported by:

    the Natural Science Foundation of Hunan Province, No. 09JJ3029*

PDF

457

被引次数

7

摘要：

背景：目前对于薄弱根管重塑后桩核修复的研究多为复合树脂重塑后金属桩核修复，纤维桩核修复研究较少。
目的：采用三维有限元方法对薄弱根管重塑后应用不同材料桩核修复的牙本质内应力分布情况进行分析。
方法：利用螺旋CT扫描正常上颌中切牙，获得BMP位图后，应用Adobe Photoshop Matlab 7.0软件建立正常牙、薄弱根管及薄弱根管重塑模型，将数据输入Ansys 11.0中形成三维有限元模型。模拟临床正常咬合对模型进行加载，分析石英纤维桩核冠、玻璃纤维桩核冠、铸造镍铬合金桩核冠修复正常根管、薄弱根管、重塑后薄弱根管3种状态根管的牙本质、桩核及重塑体内的应力分布情况。
结果与结论：薄弱根管重塑后桩核冠修复整个牙根的Von mises应力可下降到正常根管水平，且应力分布情况也与正常根管相似。纤维桩核修复不会明显改变高应力区的分布，与桩修复前牙根的应力分布相同；铸造镍铬合金桩核修复不会明显改变高应力区的分布，但与桩修复前牙根的应力分布不同，使薄弱根管牙根颈部唇侧牙本质的Von mises应力峰值明显升高，重塑根管后有所下降，但仍高于正常根管。提示用弹性模量和牙本质接近的修复材料重塑薄弱根管，可以降低牙本质及桩内的应力，有利于薄弱根管残根的保存治疗。纤维桩较铸造镍铬合金桩更适于残根的桩核冠修复。

关键词: 薄弱根管, 根管重塑, 纤维桩, 应力分布, 三维有限元

Abstract:

BACKGROUND: At present, there are many clinical and experimental studies in the root after rehabilitation of flared root canal with post-core crowns; most of studies in the root rehabilitated by composite resin are restored with mental post-core but not fiber post-core.
OBJECTIVE: To investigate the stress distribution in the root after rehabilitation of flared root canal with post-core crowns.
METHODS: CT scanned the normal maxillary central incisor, and pieces of transaction pictures were obtained which output in BMP bitmap format. The model of the normal tooth, weakened root and that restored with post-core systems was established by Adobe Photoshop, Matlab 7.0 software. The data were input into the Ansysworkbench of the Ansys 11.0 software, to acquire the three-dimensional finite element models. The force was loaded on all of the models simulating clinical normal bite. The stress value and distribution in the root of three states that were restored by post-core of three materials were analyzed.
RESULTS AND CONCLUSION: After the weakened root repaired by light-solidified composite resin, Von mises stress value and distribution were similar to those of the normal root restored with post-core. There was only a little difference in high stress areas distribution among three states of root restored by fiber post-core system. It was the same with the distribution of the normal root without post-core. There was only a little difference in high stress areas distribution among three states of root restored by casting nichrome post-core system. It was different from the distribution of the normal root without post-core. The stress peak value of Von mises in the labial side of the cerival dentin of the weakened root had significantly increased, that had declined slightly after the weakened root repair, which was still higher than that of the normal root. It is indicated that the weakened root is repaired by the restoring materials whose elastic modulus near the dentin. The stress has decreased and the stress distribution has changed, that makes the stress distribution of the root similar to which of the normal root restored by post-core system. It is beneficial to the preservative therapy of the residual root. The fiber post is more appropriate for the prosthodontic treatment of the residual root.

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