Long-term effect of quad helix expansion of dental arch

doi:10.3969/j.issn.2095-4344.2013.28.013

Abstract

Abstract:

BACKGROUND: Rapid expansion of the dental arch is an effective way to rapidly expanse the jaw. Compared with rapid expansion, the slow expansion has higher stability and less recurrence, but the reports on the long-term stability of quad helix expansion are rare.
OBJECTIVE: To retrospectively analyze the clinical effect of quad helix expansion in orthodontics.
METHODS: Twenty-two subjects with dental arch stenosis in mixed dentition and early permanent dentition who experienced an expansion of at least 3 mm with quad helix appliance were selected for this study. Plaster dental casts and posteroanterior radiographs were evaluated at the beginning of the treatment (T1), at the completion of phase I quad helix expansion or full treatment (T2), and approximately 2 years following the completion of treatment (T3). The distance between two first molars was measured on the model. J point was drawn on the posteroanterior radiograph in order to measure the distance between the bilateral base bones and the molar inclination, as well as to evaluate the corrective and orthopedic effects of dental arch expansion.
RESULTS AND CONCLUSION: Compared with that before expansion, the first permanent molar inclination and the distance between base bones on two sides were significant increased after quad helix expansion; there were no significant differences in the distance between two first permanent molars, first permanent molar inclination and the distance between bilateral base bones on two sides when compared after quad helix expansion and after 2-year follow-up (P > 0.05). The results indicate that the long-term effect of quad helix expansion is stable with orthopedic effect.

Key words: tissue construction, oral tissue construction, quad helix, maxillary arch expansion, orthodontics, arch width, dental arch stenosis, dental arch expansion, first permanent molar, National Natural Science Foundation of China

CLC Number:

R318

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.

Figures/Tables 4

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