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Dentoskeletal effects of a temporary skeletal anchorage device-supported rapid maxillary expansion appliance
Jason William Vassar1, Anastasios Karydis2, Terry Trojan3
1a Resident, Department of Orthodontics, University of Tennessee Health Science Center, College of Dentistry, Memphis, Tenn.
Objective:
To quantitatively evaluate maxillary skeletal expansion using cone-beam computed tomography (CBCT) images and propose a novel way to quantify the dental tipping effects of temporary skeletal anchorage device-supported rapid maxillary expansion appliance (TSADRME).
Materials And Methods:
Images from 25 patients receiving rapid maxillary expansion with incorporated temporary skeletal anchorage devices (TSADs) before activation (T1) and after removal (T2) were analyzed to detect dentoskeletal changes.
Results:
A significant increase from T1 to T2 was found for all linear measurements except buccal maxillary width at the canines. The greatest buccal expansion was at the first molar, decreasing anteriorly. However, the greatest palatal expansion was at the first premolar. All younger subjects (8-16 years old) exhibited less dental tipping and greater expansion overall compared with the older subjects. There was great variability in dental tipping of first molars (mean = 4.31°), with some subjects demonstrating mild uprighting of these teeth.
Conclusions:
The TSADRME appliance is an effective, clinically useful device that results in mild molar tipping and may positively affect expansion in the area of TSAD placement.
