Clinical study of maxillary protraction appliance combined with modified Nance arch and maxillary protraction and rapid palatal expansion in skeletal class Ⅲ malocclusion

doi:10.3969/j.issn.1674-490X.2015.03.006

Abstract

Abstract: Objective To compare the clinical investigation of maxillary protraction appliance combined with modified Nance arch and maxillary protraction and rapid palatal expansion andevaluate the changes of patients with skeletal class III malocclusion in skeletal ,dental, profile and before and after the treatment to evaluate the clinical efficacy. Methods 24 patients with skeletal class Ⅲ malocclusion in mixed dentition were divided into two groups who were treated with maxillaryprotraction combined with modified Nance arch and maxillary protraction and rapid palatal expansion.Cephalometric radiographs were analyzed to evaluate skeletodental and profile changes before and after treatment. Results SNA and ANB angle, NA-PA, Ptm-A, were increased and subspinales wereprotracted by 1.99 mm and 2.61 mm. All of the changes were statistically significant (P<0.05).Results Both of the maxillary protraction combined with modified Nance arch.andmaxillary protraction and rapid palatal expansion were obviously effective for skeletal class III malocclusion in mixed dentition, but maxillary protraction and rapid palatal expansion are much better in protracting subspinales.

Key words: skeletal class Ⅲ malocclusion, maxillary protraction appliance, maxillary protraction appliance; cephalometric analysis

CLC Number:

RAN Yidong, LIU Xuan. Clinical study of maxillary protraction appliance combined with modified Nance arch and maxillary protraction and rapid palatal expansion in skeletal class Ⅲ malocclusion[J]. Medical Reserch and Education, 2015, 32(3): 26-30.

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