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| A Comparative Study on ThreeDimensional Movement of Incisors when Applying MDD and TipEdge Appliances during Alignment and Leveling Stage |
1 The Affiliated Hospital of Stomatology of Chongqing Medical University,Chongqing City Oral Diseases and Biological Research Center, Chongqing 401147, China
2 The Stomatology Department of Sichuan Dazhou Central Hospital, Dazhou 635000, China
3 The Stomatology Department of Shandong Laiwu Xinwen Mining Group Central Hospital, Laiwu 271103, China |
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Abstract The aim of this work is to compare the threedimensional movement of incisors when applying Tip-Edge and MDD appliances in the alignment and leveling stage and provide reference to the improvement and clinical application of differential straight wire appliance. Ten of the same type of angle ⅡclassificationⅠmaxillary and mandibular Typodont models were chosed, and the first premolars were extracted. The samples were divided into two groups: Tip-Edge group and MDD group, each group had 5 samples. Australian wires of 0.41 mm were used to align the teeth while bathed in a constant temperature of 45 ℃ for 20 min and 40 min. ATOS flowing optical scanner was used to scan the models of the Tip-Edge and MDD group before and after each water bath, and the horizontal sagittal and vertical three dimensional system was established. Geomagic software was used to overlap the three dimensional digital models that were taken before and after each water bath, the sign points’ changes were qualified by the color map. SPSS17.0 package was used for statistical analysis. Each sign point of the two groups had moved in the horizontal, sagittal, and vertical directions after incubated in the water bath for 20 min, and 40min. The amount of movement was increased. According to the data after the water bath, we can draw following results: Horizontal: 75% of the sign points moved in the positive direction, 84% of the data had no statistical differences (P>0.05 ); Sagittal: 94% of the sign points moved libially, 88% of the data had no statistical differences (P>0.05); Vertical: All sign points moved to the gingival, 94% of the data had no statistical differences (P>0.05). Judging from the entire alignment and leveling stage, there were no statistical differences between the two groups of incisors’ movement (P>0.05). The ability to control incisors’ three dimensional movement of MDD and Tip-Edge appliances in the alignment and leveling stage had no significant differences, and MDD appliance’ effect of biteopening still need further clinical and experimental verifications.
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