中国实用医刊
中國實用醫刊
중국실용의간
CENTRAL PLAINS MEDICAL JOURNAL
2013年
20期
1-4
,共4页
上颌中切牙%桩核%有限元分析
上頜中切牙%樁覈%有限元分析
상합중절아%장핵%유한원분석
Maxillary central incisor%Post and core%Finite element analysis
目的 研究上颌中切牙中等程度缺损时不同颈部情况下,两种桩核材料对牙本质应力的影响.方法 用计算机建立上颌中切牙牙体缺损50％时桩核冠修复,当颈1/3缺损以及颈1/3完整时分别用玻璃纤维桩树脂核、金属桩核,均为烤瓷冠修复共4个模型.模拟临床正常咬(牙合),分析各模型剩余牙本质Von Mises和最大主应力的峰值和分布.结果 4个模型在牙本质表面产生相同的应力分布,两种应力均在舌侧颈缘和根颈1/3出现应力集中区；Von Mises应力从剖面图可见玻璃纤维桩组模型应力分布均匀,而金属桩组模型则明显改变了天然牙的应力分布,但能降低牙本质表面的应力.结论 当颈部牙体保留较多时,建议使用纤维桩；当颈部余留牙体较少、壁较薄时,建议使用金属桩.
目的 研究上頜中切牙中等程度缺損時不同頸部情況下,兩種樁覈材料對牙本質應力的影響.方法 用計算機建立上頜中切牙牙體缺損50％時樁覈冠脩複,噹頸1/3缺損以及頸1/3完整時分彆用玻璃纖維樁樹脂覈、金屬樁覈,均為烤瓷冠脩複共4箇模型.模擬臨床正常咬(牙閤),分析各模型剩餘牙本質Von Mises和最大主應力的峰值和分佈.結果 4箇模型在牙本質錶麵產生相同的應力分佈,兩種應力均在舌側頸緣和根頸1/3齣現應力集中區；Von Mises應力從剖麵圖可見玻璃纖維樁組模型應力分佈均勻,而金屬樁組模型則明顯改變瞭天然牙的應力分佈,但能降低牙本質錶麵的應力.結論 噹頸部牙體保留較多時,建議使用纖維樁；噹頸部餘留牙體較少、壁較薄時,建議使用金屬樁.
목적 연구상합중절아중등정도결손시불동경부정황하,량충장핵재료대아본질응력적영향.방법 용계산궤건립상합중절아아체결손50％시장핵관수복,당경1/3결손이급경1/3완정시분별용파리섬유장수지핵、금속장핵,균위고자관수복공4개모형.모의림상정상교(아합),분석각모형잉여아본질Von Mises화최대주응력적봉치화분포.결과 4개모형재아본질표면산생상동적응력분포,량충응력균재설측경연화근경1/3출현응력집중구；Von Mises응력종부면도가견파리섬유장조모형응력분포균균,이금속장조모형칙명현개변료천연아적응력분포,단능강저아본질표면적응력.결론 당경부아체보류교다시,건의사용섬유장；당경부여류아체교소、벽교박시,건의사용금속장.
Objective To investigate the influence of the stress statement on residual dentin with two different post-core on maxillary central incisor with 50％ of tooth defect (gingival place one-third of the crown defect and integrity).Methods Four endodontically treated tooth with 50％ of tooth defect were established by the computer:glass fiber post,resin core and porcelain fused to metal crown (PFMC) as restoration or restored by metal post-core and PFMC separately when gingival place one-third of the crown defect and integrity.Clinical load was simulated.Von Mises and the maximum stress were chosen.The stress peak value and stress distribution on residual dentin were investigated with different models.Results Each model showed the same stress distribution on the surface of dentin,the stresses showed significant stress concentration at the lingual cervical margin and at the cervical one-third of the tooth.From the section plane,stress distribution showed homogeneous in the glass fiber restored models,while in metal restored models,stress distribution changed significantly but stress peak was decreasing on the surface of dentine.Conclusions Comparing different post and core materials,fiber post is recommended if enough tooth structure presents at gingival place; and metal post is used if only limited tooth structure presents.
