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扇形快速上颌扩弓螺旋器和Hyrax螺旋器对颅面结构的牙齿及骨骼影响评估。

Assessment of the dental and skeletal effects of fan-type rapid maxillary expansion screw and Hyrax screw on craniofacial structures.

作者信息

Gopalakrishnan Umarevathi, Sridhar Premkumar

机构信息

Department of Orthodontics, Sri Venkateswara Dental College and Hospital, Chennai, Tamil Nadu, India.

Department of Orthodontics, Tamil Nadu Government Dental College and Hospital, Chennai, Tamil Nadu, India.

出版信息

Contemp Clin Dent. 2017 Jan-Mar;8(1):64-70. doi: 10.4103/0976-237X.205066.

DOI:10.4103/0976-237X.205066
PMID:28566854
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5426169/
Abstract

AIMS AND OBJECTIVES

The purpose of the study was to assess the skeletal and dental effects of fan-type rapid maxillary expansion (RME) appliance and Hyrax RME appliance on the craniofacial structures.

MATERIALS AND METHODS

The sample of the study included 12 patients with constricted maxillary arches. Acrylic bonded type of attachment was used for both groups. Changes in sagittal, vertical, and transverse relationship were assessed with lateral and frontal cephalograms, respectively. Intercanine and intermolar widths were measured with stone models. Pre- and immediate post-treatment records were statistically analyzed with Wilcoxon signed-rank test. The differences between the groups were evaluated using Mann-Whitney U-test. Since the data pertaining to intercanine width and intermolar width were normally distributed, parametric test of significance (unpaired -test) was used to compare them.

RESULTS

Results showed that Hyrax presented with significantly greater increments for both nasal cavity width and maxillary width when compared to fan-type RME. Both groups had retroclination of incisors. The increase in the intercanine width was almost similar in both groups.

CONCLUSION

Fan-type RME caused only minimal expansion of the intermolar width when compared to the Hyrax. The ratio between the intercanine and intermolar width expansion was nearly 4:1 in the fan-type RME and 0.75:1 in Hyrax.

摘要

目的

本研究旨在评估扇形快速上颌扩弓器（RME）和Hyrax RME矫治器对颅面结构的骨骼和牙齿影响。

材料与方法

本研究样本包括12例上颌弓狭窄患者。两组均采用丙烯酸粘结式附件。分别用侧位和正位头颅侧位片评估矢状、垂直和横向关系的变化。用石膏模型测量尖牙间宽度和磨牙间宽度。治疗前和治疗后即刻记录采用Wilcoxon符号秩检验进行统计学分析。组间差异采用Mann-Whitney U检验进行评估。由于尖牙间宽度和磨牙间宽度的数据呈正态分布，因此采用参数显著性检验（不成对t检验）对其进行比较。

结果

结果显示，与扇形RME相比，Hyrax矫治器在鼻腔宽度和上颌宽度上的增加更为显著。两组患者的切牙均有后倾。两组尖牙间宽度的增加几乎相似。

结论

与Hyrax矫治器相比，扇形RME矫治器仅使磨牙间宽度有最小程度的扩展。扇形RME矫治器尖牙间宽度与磨牙间宽度扩展的比例约为4:1，而Hyrax矫治器约为0.75:1。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/efca/5426169/715c0e53c265/CCD-8-64-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/efca/5426169/8cec23c45ac3/CCD-8-64-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/efca/5426169/b89bca9179ea/CCD-8-64-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/efca/5426169/2bdebe2306c2/CCD-8-64-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/efca/5426169/33fd25806c60/CCD-8-64-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/efca/5426169/715c0e53c265/CCD-8-64-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/efca/5426169/8cec23c45ac3/CCD-8-64-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/efca/5426169/b89bca9179ea/CCD-8-64-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/efca/5426169/2bdebe2306c2/CCD-8-64-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/efca/5426169/33fd25806c60/CCD-8-64-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/efca/5426169/715c0e53c265/CCD-8-64-g011.jpg

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