This case report presents successful orthodontic management of unilateral retained deciduous second molars and congenitally missing second premolars using an additional anchorage in conjunction with the segmented arch approach. A 21-year-old female patient presented as skeletal Class I malocclusion, mild crowding, straight facial profile, and orthodivergent facial pattern. The treatment plan was established to extract deciduous teeth and close the extraction space by molar protraction. A Nance appliance and lingual holding arch were used as an additional anchorage to maintain the facial profile and dental midline, with pure molar protraction performed using a segmented arch and sliding mechanics. After 1 year of molar protraction with well-controlled molar angulation and rotation, a continuous arch was performed for full mouth refinement. The total treatment duration was 34 months achieving unilateral molar protraction and bilateral Class I molar and canine relationships with satisfactory facial esthetics and functional occlusion.
Vejwarakul, Weerayuth; Wang, Yu-Chih; and Hsieh, Yuh-Jia
"Asymmetric Orthodontic Space Closure of Unilateral Congenitally Missing Second Premolars,"
Taiwanese Journal of Orthodontics: Vol. 33:
4, Article 4.
https://doi.org/10.38209/2708-2636.1112 Available at: https://www.tjo.org.tw/tjo/vol33/iss4/4
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