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 resistance of endodontically treated and crowned teeth
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
