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- W2359359197 abstract "Objective To find the pretreatment factors influencing the premolar extraction pattern and provide some clinical and academic reference for the premolar extraction choice before treatment.Methods In the study 96 patients involved the extraction of first premolars and 57 patients involved the extraction of second premolars.Both groups of patients were ClassⅠwithout protruding maxillary and the crowding was less than 8mm and the treatment effects were satisfactory.The lateral cephalometric radiographs taken before and after treatment were traced and measured.118 typical values of hard tissue and soft tissue were measured in Winceph 7.0 software and statistical analysis was carried by Spss10.0 software.After the statistically significant differences were searched,stepwise discriminant analysis was applied to identify the key factors for discriminating the two groups.Results IS=0.092A.P.D.I+0.065FMIA-0.049∠Pos-B'-FH-0.352 [Lower lip thickness]+0.188[soft tissue thickness of chin]-6.465.The critical score was 0.17.The patient with an individual score higher than the critical score will be treated with the second premolar extraction.When the values were taken back to the formula,the percent age was 77.1 in the first premolar extraction group and 77.2 in the second premolar extraction group.Conclusions In the choice of premolar extraction pattern before treatment,we must think of the soft tissue profile,especially the thickness of lower lip." @default.
- W2359359197 created "2016-06-24" @default.
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- W2359359197 date "2009-01-01" @default.
- W2359359197 modified "2023-09-24" @default.
- W2359359197 title "Choice of premolar extraction patterns in ClassI patients" @default.
- W2359359197 hasPublicationYear "2009" @default.
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