CAJ | 학술논문

目的研究不同钴铬合金铸造卡环的固位力在循环疲劳实验中的变化,以期为临床提供依据.方法制备进入0.25 mm和0.50 mm两种倒凹深度的3种钴铬合金卡环样本(A组:硬质型钴铬合金;B组:Regalloy～(TM);C组:Vera PDN～(TM)),在材料实验机上进行模拟临床摘戴5年的循环疲劳实验,实验过程中进行21次固位力测量.采用单因素方差分析、x～2检验及直线相关分析对实验结果进行统计分析.结果各组卡环固位力均呈现逐渐下降的变化趋势.对于进入0.50 mm倒凹的卡环,其初始固位力[A、B、C组分别为(8.714±1.104)、(9.072±0.653)和(9.588±1.980)N]与固位力丧失量[分别为(4.408±0.662)、(3.484±0.494)和(3.290±1.484)N]均大于进入0.25 mm倒凹的卡环[初始固位力分别为(7.940±0.357)、(7.834±1.308)、(8.156±1.067)N,固位力丧失最分别为(2.444±0.736)、(2.954±1.048)、(1.832±1.180)N].卡环固位力与循环摘戴次数的对数呈负相关关系.结论钴铬合金铸造卡环的固位力能满足临床使用5年的需要.
목적 연구불동고락합금주조잡배적고위력재순배피로실험중적변화,이기위림상제공의거.방법 제비진입0.25 mm화0.50 mm량충도요심도적3충고락합금잡배양본(A조:경질형고락합금;B조:Regalloy～(TM);C조:Vera PDN～(TM)),재재료실험궤상진행모의림상적대5년적순배피로실험,실험과정중진행21차고위력측량.채용단인소방차분석、x～2검험급직선상관분석대실험결과진행통계분석.결과 각조잡배고위력균정현축점하강적변화추세.대우진입0.50 mm도요적잡배,기초시고위력[A、B、C조분별위(8.714±1.104)、(9.072±0.653)화(9.588±1.980)N]여고위력상실량[분별위(4.408±0.662)、(3.484±0.494)화(3.290±1.484)N]균대우진입0.25 mm도요적잡배[초시고위력분별위(7.940±0.357)、(7.834±1.308)、(8.156±1.067)N,고위력상실최분별위(2.444±0.736)、(2.954±1.048)、(1.832±1.180)N].잡배고위력여순배적대차수적대수정부상관관계.결론 고락합금주조잡배적고위력능만족림상사용5년적수요.
Objective To investigate the change of retentive forces of cast cobalt-chromium(Co-Cr)alloy clasp in cyclic fatigue test. Methods Samples of three types of cast Co-Cr alloy(Group A:Hardalloy;B:Regalloy～(TM);C:Vera PDN～(TM))clasps were fabricated and placed at undercut depths of 0.25 mm,0.50 mm.The clasps were drawn from the model molar cyclicly to simulate 5 years of clinical use in an universal testing machine.Retentive force were record at 21 different time point for each clasp during the whole fatigue testing process.Data were subjected to ANOVA,Chi-square test and linear regression analysis.Results All clasps showed decreasing retention during the cyclic fatigue test.Clasps engaged in 0.50 mm undercut depth exhibited greater initial retentive force[Group A:(8.714±1.104)N,B:(9.072±0.653)N,C:(9.588±1.980)N]as well as greater loss of retention[Group A:(4.408 ±0.662)N,B:(3.484±0.494)N,C:(3.290±1.484)N]at the end of the test than clasps engaged in 0.25 mm undercut did[initial forces were(7.940±0.357),(7.834±1.308)and(8.156±1.067)N for Group A,B,C,respectively;loss of retention were(2.444±0.736)N,(2.954±1.048)N and (1.832±1.180)N for group A,B,C,respectively].Negative correlation was found between the clasp retention and the logarithm of cycling times.Conclusions Co-Cr alloy cast clasp could provide adequate retentive force for 5 years of clinical use.