Long-term anteroposterior and vertical maxillary changes in skeletal class II patients treated with slow and rapid maxillary expansion.
OBJECTIVE
To evaluate a 10-year follow-up of anteroposterior and vertical maxillary changes in skeletal Class II patients treated with slow and rapid maxillary expansion methods.


METHODS
The sample consisted of 70 patients divided into two groups: (1) treated with a cervical headgear with expansion of the inner bow (CHG) and (2) using a Haas-type rapid maxillary expansion appliance in conjunction with cervical headgear (RME-CHG). The CHG group consisted of 40 patients (18 males and 22 females; average age 10.6 years at pretreatment [T1], 13.6 years at posttreatment [T2], and 23.6 years at postretention [T3]). The RME-CHG group consisted of 30 patients (14 males and 16 females; average age 10.4 years at T1, 14.0 years at T2, and 24.6 years at T3). The profiles of SNA and SN-PP angles showed no significant differences in either group at T1, T2, and T3 phases.


RESULTS
For the entire sample, the profile analysis between the phases showed reduction in the SNA angle from T1-T2 and an increase from T2-T3. The SN-PP angle showed an increase from T1-T2 and a decrease from T2-T3. Treatment of skeletal Class II patients with slow and rapid maxillary expansions was efficient and stable over the long-term.


CONCLUSIONS
The profiles of SNA and SN-PP at T1, T2, and T3 achieved with slow and rapid maxillary expansions were clinically equivalent.
Department of Orthodontics, Universidade Federal do Rio de Janeiro, Brazil. robertomario@terra.com.br
Roberto M A
RM
Lima Filho
Antonio C O
AC
Ruellas
D000328:Adult; D002508:Cephalometry; D005115:Extraoral Traction Appliances; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000000981:diagnostic imaging / Q000628:therapy*; D008437:Maxilla / Q000000981:diagnostic imaging / Q000473:pathology*; D009971:Orthodontics, Corrective / Q000295:instrumentation / Q000379:methods*; D010155:Palatal Expansion Technique / Q000295:instrumentation*; D011859:Radiography; D015203:Reproducibility of Results; D013997:Time Factors