Objective To analyze the occlusal contact of patients before and after wearing Hawley retainers at the end of orthodontic fixed extraction treatment and to analyze the effect of Hawley retainers on occlusion during orthodontic retention.Methods Twenty patients who had completed fixed extraction orthodontic treatment and wore Hawly retainers immediately after removal of the appliances were selected.The occlusal contact status in the intercuspal position of the patients was recorded immediately after the end of treatment(T1)and 6 months after the end of treatment(T2)using an iTero scanner.The changes in the whole arch,anterior and posterior segments,and left and right sides were compared respectively in T1 and T2 stages in terms of occlusal contact area and the number of contact points.Results The occlusal contact area and the number of contact points in the posterior arch,left and right arch,and total arch were significantly increased in T2 stage compared with T1 stage(P＜0.05).The occlusal contact area and the number of contact points of the anterior arch had no significant difference in T1 and T2 stages(P＞0.05).The occlusal contact points in the occlusal contact spacing range"0～0.2 mm"in T2 stage were within the occlusal contact spacing range"0～1.0 mm"in T1 stage,indicating that the physiological adjustment of cuspal abrasion occurred in the teeth.Conclusion Wearing a Hawley retainer after orthodontic fixation treatment facilitates physiological adjustment of the posterior occlusion and significant improvement of occlusal stability and tightness,while it has little effect on anterior occlusion.
万方数据
维普
