摘要
目的 比较不同修复方法对根管治疗牙修复后强度的影响。方法 6 0个完整拔除的人上中切牙 ,根管治疗后随机分为 5组 ,每组 12个。A组 :完整的根管治疗牙 ;B组 :根管治疗后烤瓷熔附金属 (PFM)全冠修复 ;C组 :牙体预备保留 2 0mm高的牙本质套圈 ,铸造金属桩核及PFM全冠修复 ;D组 :牙体预备无牙本质套圈 ,铸造金属桩核及PFM全冠修复 ;E组 :牙体预备保留 2 0mm高的牙本质套圈 ,Parapost预成桩、复合树脂核及PFM全冠修复。在MTS 810材料试验机上沿与牙长轴成 135度方向加载 ,测试折裂强度。结果采用方差分析。结果 牙体预备保留 2 0mm高的牙本质套圈 ,铸造金属桩核及PFM全冠修复者折裂强度最高 ,为 (1793 5 9± 387 93)N ;完整的根管治疗牙次之 ,为(146 6 6 8± 2 40 11)N ;其余 3组的折裂强度 (95 8 49± 2 86 0 2 )N、(992 98± 2 91 0 0 )N、(994 94± 2 85 0 4)N之间 ,差异无显著性。修复牙有无牙本质套圈 ,其折裂强度间差异有高度显著性 (P <0 0 1)。结论 桩核能否增强根管治疗牙的抗折裂强度与其修复设计有关 ,牙本质套圈可明显增强根管治疗牙的抗折裂能力。
Objective To investigate the influence of post core structure on the strength of endodontically treated and crowned teeth with or without a 2 0 mm dentine ferrule. Methods A total of 60 recently extracted human maxillary central incisors were endodontically treated and randomly divided into five groups of 12 They were given following treatments: Group A, endodontically treated; Group B,endodontically treated and crowned (PFM);Group C,cast metal post core with 2 0 mm dentine ferrule and crowned (PFM);Group D, cast metal post core with no dentine ferrule and crowned (PFM);Group E,prefabricated post and composite core with 2 0mm dentine ferrule and crowned (PFM) All specimens were stored at 100% humidity at room temperature for 30 days before testing Each specimen was in a special jig on the MTS 810 universal material testing machine and subjected to a load at a 135 degree angle to the long axis until failure,with crosshead speed of 0 02 cm/minute Analysis of variance followed by the Newman Keuls pairwise multiple comparison tests was used to compare the results Results There was a statistically significant difference between different restorative methods The cast metal post core with 2 0 mm dentine ferrule and crowned teeth had the highest fracture strength (1793 59±387 93N),followed by endodontically treated intact teeth (1466 68±240 11N). No significant difference in the fracture strength was found among the other three groups (958 49±286 02N;992 98±291 00N; 994 94±285 04 N) There was a statistically significant difference in the fracture resistance between crowned teeth with and without 2 0 mm dentine ferrule ( P <0 01) Conclusions Not all post core structure could improve the strength of endodontically treated teeth The dentine ferrule can effectively improve the fracture resista
出处
《中华口腔医学杂志》
CAS
CSCD
北大核心
2002年第1期43-46,共4页
Chinese Journal of Stomatology
