Cone-beam computed tomography-guided threedimensional evaluation of treatment effectiveness of the Frog appliance

Mujia Li; Xiaoxia Su; Yang Li; Xianglin Li; Xinqin Si

Cone-beam computed tomography-guided threedimensional evaluation of treatment effectiveness of the Frog appliance

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Type: Academic journal

Author: Mujia Li (Xi’an Jiaotong University) Xiaoxia Su (Xi’an Jiaotong University) Yang Li (Xi’an No.1 Hospital) Xianglin Li (Xi’an Jiaotong University) Xinqin Si (Xi’an Jiaotong University)

Journal: KOREAN ASSOCIATION OF ORTHODONTISTS THE KOREAN JOURNAL of ORTHODONTICS Vol.49 No.3 KCI Accredited Journals SCIE

Published: 2019.5

Pages: 161 - 169 (9page)

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Cone-beam computed tomography-guided threedimensional evaluation of treatment effectiveness of the Frog appliance

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Objective: To evaluate the effectiveness of the Frog appliance in three dimensions by using cone-beam computed tomography (CBCT) images. Methods: Forty patients (21 boys and 19 girls), averaged 11.7 years old, with an Angle Class II division 1 malocclusion were included in our study. They had either late mixed dentition or early permanent dentition, and the maxillary second molars had not yet erupted. All patients underwent CBCT before and after the treatment for measuring changes in the maxillary first molars, second premolars, central incisors, and profile. Paired-samples t -test was used to compare the mean difference in each variable before treatment and after the first phase of treatment. Results: The maxillary first molars were effectively distalized by 4.25 mm (p < 0.001) and 3.53 mm (p < 0.05) in the dental crown and root apex, respectively. The tipping increased by 2.25°, but the difference was not significant. Moreover the teeth moved buccally by 0.84 mm (p < 0.05) and 2.87 mm (p < 0.01) in the mesiobuccal and distobuccal cusps, respectively, whereas no significant changes occurred in the root apex. Regarding the anchorage parts, the angle of the maxillary central incisor’s long axis to the sella-nasion plane increased by 2.76° (p < 0.05) and the distance from the upper lip to the esthetic plane decreased by 0.52 mm (p = 0.01). Conclusions: The Frog appliance effectively distalized the maxillary molars with an acceptable degree of tipping, distobuccal rotation, and buccal crown torque, with only slight anchorage loss. Furthermore, CBCT image demonstrated that it is a simple and reliable method for three-dimensional analysis.

#Non-extraction treatment #Molar distalization #Cone-beam computed tomography #Class II malocclusion

INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSION
CONCLUSION
REFERENCES

References (29)

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Alexander SA / 1992 / Diagnosis and treatment planning in orthodontics / Curr Opin Dent 2:9~13

Alexander RG / 1983 / The vari-simplex discipline. Part 2. Nonextraction treatment / J Clin Orthod 17:474~482

Ludwig B / 2011 / The skeletal frog appliance for maxillary molar distalization / J Clin Orthod 45:77~84

Byloff FK / 1997 / Distal molar movement using the pendulum appliance. Part 1: clinical and radiological evaluation / Angle Orthod 67:249~260

Bondemark L / 1992 / Distalization of maxillary first and second molars simultaneously with repelling magnets / Eur J Orthod 14:264~272

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