树脂卡环固位力和形变的体外研究  

An in vitro study of retentive force and deformation of resin clasp

作　　者：胡晓萍[1] 胡飘萍[2] 朱洪水[1] 

机构地区：[1]南昌大学附属口腔医院修复科 [2]南昌大学附属第一医院输血科,江西南昌330006

出　　处：《华西口腔医学杂志》2009年第4期422-424,429,共4页West China Journal of Stomatology

摘　　要：目的研究树脂卡环固位力和形变的大小。方法整体铸造前磨牙和磨牙试件各40个,倒凹计测定出0.25mm和0.50mm的倒凹。根据基牙类型和倒凹深度,将试件分为4组:0.25mm倒凹前磨牙组、0.50mm倒凹前磨牙组、0.25mm倒凹磨牙组、0.50mm倒凹磨牙组,每组20个试件。每组试件分别制作树脂三臂卡和Co-Cr合金三臂卡各10个。将卡环戴入相应的基牙并浸泡于去离子水中,测定在0、720、1440、2160、2880、3600、4320次连续取出和戴入循环周期时卡环的固位力,并记录0和4320次循环周期时卡环固位臂卡环尖和抗力臂卡环尖之间的距离。结果1)树脂卡环的平均固位力为1.69N,低于Co-Cr卡环的平均固位力5.87N(P<0.01)。在其他因素相同的情况下,树脂卡环的固位力小于Co-Cr卡环的固位力(P<0.01),磨牙卡环的固位力小于前磨牙卡环的固位力(P<0.01),0.25mm倒凹卡环的固位力小于0.50mm倒凹卡环的固位力(P<0.01)。随着循环次数的增加,Co-Cr卡环的固位力显著降低(P<0.01),而树脂卡环的固位力无显著变化(P>0.05)。2)4320次循环周期后,Co-Cr卡环的固位臂卡环尖和抗力臂卡环尖之间的距离显著增加(P<0.05),而树脂卡环的固位臂卡环尖和抗力臂卡环尖之间的距离无显著变化(P>0.05)。结论树脂卡环的固位力和形变均明显低于铸造卡环。Objective To study the retentive force and deformation of acetal resin clasp. Methods 40 premolars and 40 molars were cast respectively. Undercut of 0.25 mm or 0.50 mm depth were measured for each with undercut gage. According to the type of abutment and the depth of undercut, the specimens were divided into 4 groups： Premolars with 0.25 mm undercut, premolars with 0.50 mm undercut, molars with 0.25 mm undercut and molars with 0.50 mm undercut, 20 specimens each group. 10 three-arm clasps with resin and Co-Cr alloy were fabricated in each group, respectively. The clasps were set into the corresponding abutments and soaked in distilled water. The retentive force of the clasps when 0, 720, 1 440, 2 160, 2 880, 3 600, 4 320 consecutive times of setting in and removing out from the abutments were measured. The distance between the tips of retentive arm and resistant arm after 0 and 4320 cycles were recorded. Results 1）The mean retentive force of resin clasps （1.69 N） was significantly lower than that of Co-Cr clasps （5.87 N） （P〈0.01）. With the same factors, the retentive force of resin clasps were significantly less than that of Co-Cr clasps （P〈0.01）. The retentive force of molar clasps were significantly lower than that of premolar models （P〈0.01）. The retentive force of 0.25 mm undercut clasps were significantly lower than that of 0.50 mm undercut clasps （P〈0.01）. With increasing time of the cycles, the retentive force of Co- Cr clasps significantly reduced（P〈0.01）, but the retentive force of resin clasps didn＇t change significantly（P〉0.05）. 2）Mter 4 320 times, the distance between the tips of retentive arm and resistant arm of Co-Cr clasps increased significantly（P〈0.05）, but the distance between the tips of resin clasps didn＇t change significantly（P〉0.05）. Conclusion The retentive force and deformation of the resin clasp are significantly lower than those of Co-Cr clasp.

关 键 词：树脂卡环 固位力 形变 

分 类 号：R783.3[医药卫生—口腔医学]