牙髓病学中的不锈钢带：对牙尖弯曲和抗折性的影响。
Stainless steel bands in endodontics: effects on cuspal flexure and fracture resistance.
作者信息
Pane E S, Palamara J E A, Messer H H
机构信息
School of Dental Science, University of Melbourne, Melbourne, Australia.
出版信息
Int Endod J. 2002 May;35(5):467-71. doi: 10.1046/j.1365-2591.2002.00503.x.
AIMS
This study investigated the effect of stainless steel bands on cuspal flexure and fracture resistance of extracted maxillary premolars.
METHODOLOGY
Twenty extracted maxillary premolars (10 matched pairs) with mesio-occluso-distal (MOD) cavities and endodontic access were subjected to occlusal loading tests (100 N) using a servo-hydraulic testing machine. Cuspal deflections were measured by an extensometer, with and without the band present. Ten teeth (one of each pair) then had the band removed, and all teeth were subjected to loading until fracture.
RESULTS
Mean cuspal flexure of teeth with bands was one-half of flexure without bands (P < 0.001). Teeth with bands fractured at higher load than their matched pairs with the band removed (P < 0.001), with mean loads at fracture of 1282 N and 729 N, respectively.
CONCLUSIONS
The study showed that stainless steel bands used in endodontics reduce the cuspal flexure of maxillary premolars and increase their fracture resistance.
目的
本研究调查了不锈钢带环对上颌前磨牙牙尖弯曲度和抗折性的影响。
方法
选取20颗有近中-咬合-远中（MOD）洞型和开髓通路的离体上颌前磨牙（10对匹配牙），使用伺服液压试验机进行咬合加载试验（100 N）。用引伸计测量有无带环时的牙尖挠度。然后将10颗牙齿（每对中的一颗）的带环去除，所有牙齿继续加载直至折断。
结果
带环牙齿的平均牙尖弯曲度是不带环牙齿的一半（P < 0.001）。带环牙齿比去除带环的匹配牙在更高载荷下折断（P < 0.001），折断时的平均载荷分别为1282 N和729 N。
结论
该研究表明，牙髓治疗中使用的不锈钢带环可减少上颌前磨牙的牙尖弯曲度并提高其抗折性。
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