改良杆卡式附着体与不同可摘局部义齿对支持组织应力分布的研究
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摘要
目的探讨改良杆卡式附着体义齿与RPI卡环组、联合卡环组可摘局部义齿修复单侧游离缺失对支持组织的应力分布。方法在下颌47、46单侧游离缺失的环氧树脂模型上分别以改良杆卡式附着体、RPI卡环组、联合卡环组3种固位形式的可摘义齿修复,用三维光弹应力冻结切片技术测试义齿加载后对基牙和缺牙区牙槽骨应力分布。结果对基牙牙槽骨的应力:改良杆卡式附着体义齿>RPI卡环组>联合卡环组(P<0.05);附着体义齿对基牙的近、远中应力无显著性差异(P>0.05);RPI卡环组义齿有支托处的应力大于无支托处的应力(P<0.05);联合卡环组对远中的应力大于近中(P<0.05)。对缺牙区牙槽骨应力:改良杆卡式附着体与RPI卡环组均小于联合卡环组(P<0.05);附着体义齿、RPI对缺牙区牙从近中到远中的4个切片应力无显著性差异(P>0.05),联合卡环组远中大于近中(P<0.05)。结论改良杆卡式附着体义齿有应力中断作用,各点应力分布较均匀。RPI固位的活动义齿应力主要分布在基牙上,缺牙区应力稍小。联合卡环组义齿对失牙区的应力最大,基牙上应力较小。
Objective To investigate the stress distribution of improved rod cassette attachment and removable partial denture to the supporting tissues for repairing unilateral free deficiency. Methods On mandibular 47,46 unilateral free missing model made of epoxy resin,the improved rod cassette attachment,RPI clasp and joint clasp were respectively used for the repair. Three dimensional photoelastic stress frozen section technology was used to test the stress distribution to the alveolar bone of the abutment teeth and edentulous area on load. Results Stress to alveolar bone of the abutment tooth: the stress of improved rod cassette attachment was greater than that of RPI clasp and the joint clasp( P < 0. 05),and RPI clasp greater than that of the joint clasp( P < 0. 05); The stress on occlusal bracket was greater than that of the place without occlusal bracket in RPI clasp( P < 0. 05),and the distal stress was greater than mesial in joint clasp( P < 0. 05). The stress to alveolar bone of the edentulous area: the improved rod cassette attachment and RPI clasp was not different( P >0. 05) but were less than joint clasp( P < 0. 05); in the four sections of the edentulous area from the mesial to the distal,the difference of the stress of attachment denture and RPI was not significant( P > 0. 05). Conclusion The improved rod cassette attachment denture had stress interruption effect and the stress was more uniform. The stress of RPI clasp denture distributed mainly on the abutment teeth. The stress of the joint clasp denture was more in edentulous area and less in abutment teeth.
Objective To investigate the stress distribution of improved rod cassette attachment and removable partial denture to the supporting tissues for repairing unilateral free deficiency. Methods On mandibular 47,46 unilateral free missing model made of epoxy resin,the improved rod cassette attachment,RPI clasp and joint clasp were respectively used for the repair. Three dimensional photoelastic stress frozen section technology was used to test the stress distribution to the alveolar bone of the abutment teeth and edentulous area on load. Results Stress to alveolar bone of the abutment tooth: the stress of improved rod cassette attachment was greater than that of RPI clasp and the joint clasp( P < 0. 05),and RPI clasp greater than that of the joint clasp( P < 0. 05); The stress on occlusal bracket was greater than that of the place without occlusal bracket in RPI clasp( P < 0. 05),and the distal stress was greater than mesial in joint clasp( P < 0. 05). The stress to alveolar bone of the edentulous area: the improved rod cassette attachment and RPI clasp was not different( P >0. 05) but were less than joint clasp( P < 0. 05); in the four sections of the edentulous area from the mesial to the distal,the difference of the stress of attachment denture and RPI was not significant( P > 0. 05). Conclusion The improved rod cassette attachment denture had stress interruption effect and the stress was more uniform. The stress of RPI clasp denture distributed mainly on the abutment teeth. The stress of the joint clasp denture was more in edentulous area and less in abutment teeth.
引文
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6 大连工学院.光弹性实验.北京:国防工业出版社,1978.216.
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8 李映欣,邓燕,董本涵,等.应用电子散斑干涉术对下颌单侧游离缺失修复体受载的实验研究.中华口腔医学杂志,1998,33(2):18-20.
9 Pezzoli M,Appendino P,Calcagno L,et al.Load transimission evaluation by removable distal-extension partial dentures using holographic interferometry.J Dent,1993,21(5):312-316.
2 Riedy SJ.The precision attachment removable partial denture.J Tenn Dent Assoc,1997,77(2):36-39.
3 Tsai TP,Shen YF.Simplified method for fabrication of a claspless removeable partial denture using extracoronal resilient attachment.J Prosthet Dent,1999,82(1):114-115.
4 陈启林,冷卫东,陈吉华,等.单侧游离端附着体义齿三维光弹模型的建立.北京口腔医学,2006,14(1):34-36.
5 中华医学会.临床技术操作规范.口腔医学分册--磁性固位体义齿.北京:人民军医出版社,2004.224.
6 大连工学院.光弹性实验.北京:国防工业出版社,1978.216.
7 张如一.实验应力分析.北京:机械工业出版社,1991.90.
8 李映欣,邓燕,董本涵,等.应用电子散斑干涉术对下颌单侧游离缺失修复体受载的实验研究.中华口腔医学杂志,1998,33(2):18-20.
9 Pezzoli M,Appendino P,Calcagno L,et al.Load transimission evaluation by removable distal-extension partial dentures using holographic interferometry.J Dent,1993,21(5):312-316.