Main Instructor 李岳澤
Department / Institution Department of Craniofacial Orthodontics, Chang Gung Memorial Hospital, Linkou, Taiwan
Classification Case report
Protraction of posterior teeth to close multiple interdental spaces is challenging. It requires an adequate anchorage and biomechanical design to avoid anterior anchorage loss and tipping of molars. This clinical report describes a case of a patients with multiple interdental spaces treated by protracting posterior teeth using temporary anchorage devices (TADs) to close posterior spacings.
A 31-year-old female had a chief complaint of anterior crossbite and multiple spacings. She had skeletal class III malocclusion with mandibular prognathism and functional shift, hypodivergent facial pattern, and a concave facial profile with retrusive lips. Dental problems included anterior teeth lingual crossbite, maxillary anterior teeth crowding, retroclined mandibular incisors, spacings between #33~47 with #46 missing, and #15 residual root. The treatment plan included non-extraction, maxillary arch development, and interdental space closure using TADs combined with sliding jig/extension hooks for protracting maxillary and mandibular right premolars/molars. The anterior crossbite and the dental sagittal relationship were corrected, the interdental spacings were closed, and proper overbite/overjet and occlusion were obtained. The lip posture and the facial profile were improved.
「Discussion and Summary」
Closure of mandibular posterior multiple spacings can be successfully achieved by the protraction of posterior teeth using TADs and appropriate mechanics design.
Protraction of Posterior Teeth Using Temporary Anchorage Devices in Anterior Crossbite with Multiple Spacings- A Case Report