Dimensional changes in the palate associated with slow maxillary expansion for early treatment of posterior crossbite.
OBJECTIVES
To compare palatal symmetry, dimensions, and molar angulations following early mixed-dentition slow maxillary expansion with parameters in normal controls.


MATERIALS AND METHODS
A total of 30 patients treated with a Haas-type expander for unilateral posterior crossbite with functional shift were compared with 30 controls matched for dental age, gender, and molar relationship. Records were taken before (T1) and after expansion (T2). Palatal width, surface area, volume, and molar angulations were measured on digitized models. Surface area and volume were split in half then divided into anterior, middle, and posterior segments to measure symmetry. Student's t-test was used to assess group differences.


RESULTS
Mean intercanine width increased 4.65 mm, and intermolar width increased 4.76 mm. The treated mean surface area increased 127.05 mm2 compared with 10.35 mm2 in controls. The treated palatal volume increased 927.55 mm3 compared with 159.89 mm3 for controls. At T1, the controls showed significant differences in surface area and volume between the anterior palatal segments. At T2, this difference occurred in surface area of middle palatal segments of the treated sample. First permanent molars showed an increased buccal and distal inclination after treatment, opposite to controls. The increase in buccal inclination was greater on the crossbite side.


CONCLUSIONS
The Haas-type expander results in similar expansion across the canines and first molars. A palate that is symmetrical before expansion may become asymmetric after expansion but only in the middle segment. Changes in individual molar angulation following palatal expansion can be measured without radiation imaging.
['Bukhari|Abdulkadir|A|', 'Kennedy|David|D|', 'Hannam|Alan|A|', 'Aleksejūnienė|Jolanta|J|', 'Yen|Edwin|E|']
D016022:Case-Control Studies D002648:Child D005260:Female D006801:Humans D008297:Male D008310:Malocclusion D010155:Palatal Expansion Technique D010159:Palate D012189:Retrospective Studies
Posterior crossbite Palatal dimensions Slow expansion