Chinese Journal of Tissue Engineering Research ›› 2013, Vol. 17 ›› Issue (28): 5177-5183.doi: 10.3969/j.issn.2095-4344.2013.28.013
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Wang Feng, Lu Huai-xiu, Lin Song-shan
Online:
2013-07-09
Published:
2013-07-09
Contact:
Lu Huai-xiu, M.D., Associate chief physician, Department of Stomatology, Naval General Hospital of PLA , Beijing 100048, China
Luhuaix123@sina.com
About author:
Wang Feng☆, M.D., Associate chief physician, Department of Stomatology, Naval General Hospital of PLA, Beijing 100048, China
wolfwang2003@yahoo.com.cn
Supported by:
National Natural Science Foundation of China, No. 81070837*
CLC Number:
Wang Feng, Lu Huai-xiu, Lin Song-shan. Long-term effect of quad helix expansion of dental arch[J]. Chinese Journal of Tissue Engineering Research, 2013, 17(28): 5177-5183.
Data analysis and clinical data of the subjects All the 22 patients were included in the analysis. A repeated measures analysis of variance model showed the interaction of time, age, duration of quad helix treatment, the interaction of time and duration had no statistically significant effect on intermolar distance (P > 0.05), but the duration (T1, T2, T3) had a highly significant effect on intermolar distance (P < 0.05) (Table 1). The increasing of intermolar width of the dental arch stenosis patients after dental arch expansion The result showed that the duration (T1, T2, T3) had a significant effect on intermolar distance (P < 0.05). The two sample t-test showed there was statistically significant increasing in intermolar distance from T1 to T2 (P < 0.05), there was no significant difference in intermolar distance from T2 to T3 (P > 0.05), and there was a statistically significant increasing in intermolar distance from T1 to T3 (P < 0.05, Table 2)."
Decreasing of maxillary first molar inclination of the dental arch stenosis patients after expansion For results of inclination measurement (Table 3), a general linear model showed that duration had a statistically significant effect on angle (P < 0.05). The two sample t-test showed that there was a significant decreasing in inclination from T1 to T2 (P < 0.05). There was no significant difference in inclination from T2 to T3 (P > 0.05). However, there was a significant decreasing in inclination from T1 to T3 (P < 0.05). Thus, the results showed that the maxillary first molar inclinations from T1 to T2 were decreased, the curve of Wilson was diminished with treatment. However, the intermolar distances were increased from T1 to T2. There was no significant decrease in maxillary first inclination or intermolar distance between T2 to T3."
Increasing of distance between base bones on two sides of dental arch stenosis patients after expansion Evaluation of J point measurements (Table 4) using the Wilcoxon Rank Test at the significance level of a=0.5 indicated that there was a statistically significant increasing from T1 to T2 (P < 0.05) and from T1 to T3 (P < 0.05). There was no statistically significant change from T2 to T3 (P > 0.05)."
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