牙体牙髓牙周病学杂志
牙體牙髓牙週病學雜誌
아체아수아주병학잡지
CHINESE JOURNAL OF CONSERVATIVE DENTISTRY
2014年
10期
577-580,610
,共5页
齿冠延长术%应力分析%修复设计%有限元分析
齒冠延長術%應力分析%脩複設計%有限元分析
치관연장술%응력분석%수복설계%유한원분석
surgical crown lengthening%stress analysis%dental restoration design%finite element analysis
目的：比较上颌双侧中切牙外伤行冠延长术后，不同修复设计对牙槽骨应力及牙齿动度的影响。方法：通过逆向工程技术建立齿冠延长术后不同骨下降高度的三维有限元模型，并将其设计为单冠、二联冠、三联冠、四联冠修复；然后用三维有限元法分析降低不同牙槽骨高度对桩核冠修复后牙槽骨应力分布及牙齿动度的影响。结果：随着牙槽骨高度的降低，所有修复形式组的牙槽骨应力及牙齿位移都有所上升，其中单冠修复组的增加幅度最大；当骨高度下降1 mm和2 mm时，单冠和3种联冠修复均能满足牙周潜力的要求；而骨下降高度为3 mm时，单冠修复组的应力值超过了牙周潜力的范围，二联冠修复接近牙周潜力，三联冠及四联冠修复均小于牙周潜力。结论：去骨高度在2 mm以内时，单冠和二联冠修复均可，但二联冠可以降低手术后造成的不利影响；当去骨高度为3 mm时，必须采用联冠修复，最好选用三联冠修复。
目的：比較上頜雙側中切牙外傷行冠延長術後，不同脩複設計對牙槽骨應力及牙齒動度的影響。方法：通過逆嚮工程技術建立齒冠延長術後不同骨下降高度的三維有限元模型，併將其設計為單冠、二聯冠、三聯冠、四聯冠脩複；然後用三維有限元法分析降低不同牙槽骨高度對樁覈冠脩複後牙槽骨應力分佈及牙齒動度的影響。結果：隨著牙槽骨高度的降低，所有脩複形式組的牙槽骨應力及牙齒位移都有所上升，其中單冠脩複組的增加幅度最大；噹骨高度下降1 mm和2 mm時，單冠和3種聯冠脩複均能滿足牙週潛力的要求；而骨下降高度為3 mm時，單冠脩複組的應力值超過瞭牙週潛力的範圍，二聯冠脩複接近牙週潛力，三聯冠及四聯冠脩複均小于牙週潛力。結論：去骨高度在2 mm以內時，單冠和二聯冠脩複均可，但二聯冠可以降低手術後造成的不利影響；噹去骨高度為3 mm時，必鬚採用聯冠脩複，最好選用三聯冠脩複。
목적：비교상합쌍측중절아외상행관연장술후，불동수복설계대아조골응력급아치동도적영향。방법：통과역향공정기술건립치관연장술후불동골하강고도적삼유유한원모형，병장기설계위단관、이련관、삼련관、사련관수복；연후용삼유유한원법분석강저불동아조골고도대장핵관수복후아조골응력분포급아치동도적영향。결과：수착아조골고도적강저，소유수복형식조적아조골응력급아치위이도유소상승，기중단관수복조적증가폭도최대；당골고도하강1 mm화2 mm시，단관화3충련관수복균능만족아주잠력적요구；이골하강고도위3 mm시，단관수복조적응력치초과료아주잠력적범위，이련관수복접근아주잠력，삼련관급사련관수복균소우아주잠력。결론：거골고도재2 mm이내시，단관화이련관수복균가，단이련관가이강저수술후조성적불리영향；당거골고도위3 mm시，필수채용련관수복，최호선용삼련관수복。
AIM:To investigate the effects of different prosthetic designs on the alveolar bone stress distri-bution and tooth moblilty of bilateral maxillary central incisors after surgical crown lengthening.METHODS:A three dimensional finite element model(3DFEM)of crowns with different alveolar bone height aroud the bilateral maxillary incisors was established by reverse modeling method.According to the design of prosthesis,the models was divided into 4 groups:single crown,2-unit combined crowns,3-unit combined crowns and 4-unit combined crowns.The alveolar bone stress distribution and terminal mobility with different crown design was analyzed using the 3DFEM.RESULTS:The maximum von Mises stress in the alveolar bone and the terminal mobility of the crown increased with the reduction of alveolar bone height.When the bone height reduced by less than 2 mm,all designs of restorations meet the require-ments of periodontal potential.While the bone height reduced by 3 mm,the stress produced by single crown design ex-ceeded the range of periodontal potential.CONCLUSION:When the bone height decreases less than 2 mm,both sin-gle crown and combined crowns can be used.When the bone height decreases greater than 3 mm,combined crowns should be used for bilateral maxillary incisors restoration after surgical crown lengthening.
