Using The Tee-Test Occlusion Analysis System To Grade The Influence Of Extraction Treatment On Occlusion

Purpose:(1) To inspect the repeatability of results from the Tee-test occlusal analysis system records.(2) To understand the differences between occlusal contact features in different populations and investigate the influence of orthodontic treatment on occlusion contact features.(3) To understand the changes in the laws of the occlusion contact features in the retention phases of post orthodontic treatment, the factors influencing post orthodontic instability, for a reference of stability in dentition post orthodontic treatment clinically. Method:(1) We selected 10 individual normal occlusion, evenly divided between male and female. We used 20 flexible Tee-test sensors which were randomly divided into two groups of 10 each. Each subject underwent the intercuspal occlusion three consecutive times and resting for 10 minutes after every three records. We used SPSS 20.0 to compare the difference between of three records on one flexible sensor and the difference between two flexible sensors for the same individual.(2) We selected 10 individual normal occlusion, 40 individuals with malocclusion, 40 individuals of post orthodontic treatment, evenly distributed between male and female. We used the Tee-Test occlusion analysis system to detect the full occlusal contact area, total of force(TOF), force per unit area, asymmetry of force(AOF), center of force( COF), the percentages of the single teeth in dentition and we used the above six indicators to investigate the differences among the three groups. We also investigated the gender differences in occlusion contact features.(3) We selected 10 individual normal occlusion, 40 individuals of 1year retention phase, 40 individuals of post orthodontic treatment, evenly distributed between male and female. We used the Tee-Test occlusion analysis system to detect the full occlusal contact area, total of force(TOF), force per unit area, asymmetry of force(AOF), center of force( COF), the percentages of the single teeth in dentition and we used the above six indicators to investigate the differences between occlusion contact post orthodontic treatment and in normal individuals. We also investigated the gender differences in occlusion contact features. Results:(1) In a flexible sensor recording three consecutive ICP results of the full dentition occlusal contact area, TOF, force per unit area, AOF, COF were not significantly different(P>0.05). The same individual's results with unidentical sensors were not significantly different(P>0.05).(2) The data from the individual normal occlusion group, malocclusion group and post orthodontic treatment group were compared and the results were as follows:the full dentition occlusal contact area, TOF, AOF, COF were significantly different(P<0.05), the force per unit area showed no significant difference(P>0.05). In three groups the percentages of the single teeth in dentition at positions 14, 16, 17, 23 and 25 were significantly different(P<0.05), the other positions were showed no significant difference(P>0.05). The gender differences in occlusion contact features showed no significant difference(P>0.05).(3) The data from the individual normal occlusion group, post orthodontic treatment group and post orthodontic treatment retention phase group were compared and the results were as follows: the full dentition occlusal contact area and TOF were significantly different(P<0.05), the force per unit area, AOF and COF showed no significant difference(P>0.05). In three groups the percentages of the single teeth in dentition at positions 14, 15, 17,23,24,25 and 27 were significantly different(P<0.05), the other positions were showed no significant difference(P>0.05). The gender differences in occlusion contact features showed no significant difference(P>0.05). Conclusion:(1) Tee-test occlusion analysis system showed stability and can be reproduced and to be used to investigate occlusion analysis.(2) The function and stable of occlusion in post orthodontic treatment group showed better results compared to malocclusion group but the results were not as positive as compared to the individual normal occlusion groups.(3) The results of the post orthodontic groups were close to the normal range, the results of the 1year-post orthodontic group were close to the individual normal occlusion group.(4) Grading and fine adjustment treatment are required before the completion of orthodontic treatment in patients with occlusion contact.