Autotransplantation of premolars to anterior region after incisor loss due to trauma is accepted as the best restoration procedure with very long follow-ups. There are two main protocols: Premolars with only two third...Autotransplantation of premolars to anterior region after incisor loss due to trauma is accepted as the best restoration procedure with very long follow-ups. There are two main protocols: Premolars with only two thirds of the root or premolars with complete root development. Premolars with two thirds of the root completed remain vital and show complete pulp obliteration while premolars with closed apex require root canal treatment. The problem arises when the child is very young and the root of the donor premolar is developed for only one third. This case report describes the outcome of an autotransplantation of a lower first premolar with only a third of developed root to the anterior region. The donor tooth was extracted with his follicle and placed instead of tooth No. 21. For the first month esthetics was restored with a glass-fibers ribbon attached to tooth No. 11 and composite material. After a month, the crown erupted and was reshaped to mimic an incisor with composite. Orthodontic movement was performed after 5 mo, in order to alleviate the gingival contour. The final restoration was performed after 15 mo. Follow up showed full root development with normal mobility, continuous periodontal ligament and complete pulp obliteration. A multidisciplinary approach and meticulous preparation are necessary for a positive result in autotransplantation of premolars with only a third of root development to the anterior region and this case report show that this method can be performed in very young children.展开更多
目的:测试Tri Auto ZX(Morita,Japan)和JustyⅡ(TME-601,Yosh ida Toe i Engineering Company,Ja-pan)2种根管长度电测仪的准确性。方法:用2种电测仪在体外模型中测试26个恒牙根管的长度,体视显微镜下观测根尖狭窄的位置,计算测量偏差...目的:测试Tri Auto ZX(Morita,Japan)和JustyⅡ(TME-601,Yosh ida Toe i Engineering Company,Ja-pan)2种根管长度电测仪的准确性。方法:用2种电测仪在体外模型中测试26个恒牙根管的长度,体视显微镜下观测根尖狭窄的位置,计算测量偏差及准确率。结果:Tri Auto ZX在“0.5”读数处测量偏差显著低于JustyⅡ的“0.5”读数处偏差(P<0.01),测量准确率显著高于JustyⅡ的相应准确率(P<0.01);JustyⅡ“APEX”读数处测量偏差显著低于“0.5”读数处偏差(P<0.01),在±0.5 mm范围内准确率显著高于“0.5”读数(P=0.01)。结论:在离体条件下Tri Auto ZX的测量准确性优于JustyⅡ;Tri Auto ZX的“0.5”、“APEX”及JustyⅡ的“APEX”读数可以作为准确测量操作长度的参考读数。展开更多
文摘Autotransplantation of premolars to anterior region after incisor loss due to trauma is accepted as the best restoration procedure with very long follow-ups. There are two main protocols: Premolars with only two thirds of the root or premolars with complete root development. Premolars with two thirds of the root completed remain vital and show complete pulp obliteration while premolars with closed apex require root canal treatment. The problem arises when the child is very young and the root of the donor premolar is developed for only one third. This case report describes the outcome of an autotransplantation of a lower first premolar with only a third of developed root to the anterior region. The donor tooth was extracted with his follicle and placed instead of tooth No. 21. For the first month esthetics was restored with a glass-fibers ribbon attached to tooth No. 11 and composite material. After a month, the crown erupted and was reshaped to mimic an incisor with composite. Orthodontic movement was performed after 5 mo, in order to alleviate the gingival contour. The final restoration was performed after 15 mo. Follow up showed full root development with normal mobility, continuous periodontal ligament and complete pulp obliteration. A multidisciplinary approach and meticulous preparation are necessary for a positive result in autotransplantation of premolars with only a third of root development to the anterior region and this case report show that this method can be performed in very young children.
文摘目的:测试Tri Auto ZX(Morita,Japan)和JustyⅡ(TME-601,Yosh ida Toe i Engineering Company,Ja-pan)2种根管长度电测仪的准确性。方法:用2种电测仪在体外模型中测试26个恒牙根管的长度,体视显微镜下观测根尖狭窄的位置,计算测量偏差及准确率。结果:Tri Auto ZX在“0.5”读数处测量偏差显著低于JustyⅡ的“0.5”读数处偏差(P<0.01),测量准确率显著高于JustyⅡ的相应准确率(P<0.01);JustyⅡ“APEX”读数处测量偏差显著低于“0.5”读数处偏差(P<0.01),在±0.5 mm范围内准确率显著高于“0.5”读数(P=0.01)。结论:在离体条件下Tri Auto ZX的测量准确性优于JustyⅡ;Tri Auto ZX的“0.5”、“APEX”及JustyⅡ的“APEX”读数可以作为准确测量操作长度的参考读数。
