Journal of the Korean Academy of Pediatric Dentistry 2012;39(3):293-300.
Published online August 31, 2012.
SHORT-TERM EFFECTS OF THE FUNCTIONAL REGULATOR III APPLIED TO ANTERIOR CROSSBITE PATIENTS IN EARLY MIXED DENTITION
Se-Eun Woo, Soon-Hyeun Nam, Young-Jin Kim, Hyun-Jung Kim
Dept. of Pediatric Dentistry, College of Dentistry, Kyungpook National University 
Correspondence:  Hyun-Jung Kim,  Tel: 053-600-7201, Email: jungkim@knu.ac.kr
Received: 20 May 2012   • Accepted: 31 July 2012
Abstract
In case of treating the functional type of anterior cross bite, removing the cause in early stage prevents from turning to skeletal type, leads to perform normal function, and has improved facial appearance. Functional Regulator III (FR III), one kind of the Functional regulator(FR)s suggested by Ro¨lf Fra¨nkel in 1966, applied to patients with the functional and skeletal anterior crossbite in early mixed, and permanent dentition. This appliance improves unbalanced power condition by blocking abnormal muscle-power effect, so that normal growth can be expected. In this case report, favorable results were obtained by selecting clinical cases of children in their early mixed dentition with functional cross bite. 1. FR IIIs were applied to patients with anterior crossbite for 5~6 months. Anterior crossbite patients were corrected favorably, nevertheless they didn't show any horizontal skeletal-changes by buccal shields. 2. Normal occlusion and esthetic facial contour were achieved from dental movement of maxillary and mandibular anterior teeth while the mandible rotates to posterior and inferior direction.
Key Words: Anterior crossbite, FR Ⅲ, Early mixed dentition, Short-term effect


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