激光焊接技术改进对衔铁磁力影响的实验研究  

Experimental study of the influence of the laser welding technology improvements on the magnetic force of keeper

作　　者：钟惠兰[1] 刘长虹[1] 张迪[1] 朱晓斌[1] 段培佳[1] 

机构地区：[1]广东省口腔医院.南方医科大学附属口腔医院,广东广州510280

出　　处：《广东牙病防治》2015年第10期518-521,共4页Journal of Dental Prevention and Treatment

摘　　要：目的探讨改进激光焊接技术对磁性附着体衔铁与基桩焊接后的磁力影响,为临床应用提供实验依据。方法采用Nd:YAG激光点焊机,以牙科高熔钴铬合金为基体金属,对磁性附着体W600型成品衔铁进行焊接。试件分3组:A组作焊接面坡口设计,B组作焊接面坡口设计并调整焊接参数,C组作焊接面无坡口设计。测试焊接后3组试件与同一磁体之间磁性固位力的变化。结果各组磁性固位力焊接前后自身对照:焊接前各组磁性固位力分别为A组(5.026±0.047)N,B组(4.922±0.056)N,C组(5.034±0.035)N,焊接后各组磁性固位力分别为A组(4.296±0.096)N,B组(4.270±0.082)N,C组(3.308±0.066)N。A组(t=13.771)、B组(t=15.225)、C组(t=49.701)磁性固位力在焊接后均有所下降(P<0.001);焊接后各组磁性固位力两两比较,A组、B组磁性固位力比C组保存更好(P<0.001),A组与B组之间差异无统计学意义(P>0.05)。结论衔铁与钴铬合金焊接面的坡口设计,使焊接过程中熔化的金属堆积于衔铁侧方,可较完整保存衔铁的磁力面积,缓解磁性附着体在激光焊接后的磁力下降。Objective To investigate the influence of laser welding technology improvements on the magnetic force of the magnetic attachment after welding of the keeper and the abutment. Methods W600 type magnetic attachment keeper was melted by Nd： YAG laser spot welding machine, with dental high-melting cobalt chrome as the base metal. Specimens were divided into three groups： group A was designed with the welding surface groove, group B was designed with the welding surface and the welding parameters was adjusted, group C was the welding surface without groove design.Test the magnetic retention force changes between the three groups and the same magnet. Results Magnetic retention force of each group before and after melting were compared. The magnetic retention force were group A（5. 026 ±0. 047） N, group B（4. 922 ± 0. 056） N, group C（5. 034 ± 0. 035） N before melting, which became group A（4. 296 ±0. 096） N, group B（4. 270 ± 0. 082） N, group C（3. 308 ± 0. 066） N after melting. The magnetic retention force of each group declined after melting（P〈0. 001）; After melting, group A and group B was better than group C（P〈0. 001）, but there was no difference between group A and group B（P〈0. 05）. Conclusion The groove design of the melting surface between keeper and cobalt-chromium alloy could put the melted metal beside keeper during melting process, could save intact magnetic area of the keeper,and could ease the magnetic force decline after laser melting.

关 键 词：激光焊接 衔铁 磁性固位力 

分 类 号：R783.2[医药卫生—口腔医学]