Differential treatment effects of two anchorage systems for rapid maxillary expansion: a retrospective cephalometric study

作者：Hourfar Jan; Kinzinger Gero Stefan Michael; Ludwig Bjoern; Spindler Julia; Lisson Joerg Alexander

来源：Journal of Orofacial Orthopedics, 2016, 77(5): 314-324.

DOI：10.1007/s00056-016-0037-1

• Cephalometric study
• Analysis of cephalograms
• Rapid maxillary expansion
• Angle class I
• Angle class III

Objectives The purpose of this study was to compare cephalometric changes resulting from treatment with two appliances for rapid maxillary expansion: (1) a strictly tooth-borne appliance and (2) a combined tooth-and boneborne appliance.
Patients and methods Pre- and posttreatment lateral cephalograms of 100 patients were analyzed by cephalometry. Of these patients, 50 were treated with strictly tooth-borne and another 50 with combined tooth- and bone-borne appliances. Mean pretreatment age was 13.04 +/- 4.82 years, and mean treatment duration was 7.12 +/- 2.37 months. To identify any implications for clinical therapy, additional subgroups were formed based on the pretreatment cephalometric findings for skeletal Class I (0 degrees < ANB <= 4 degrees) or Class III (ANB <= 0 degrees). Paired t-tests were used for intragroup and analysis of variance (ANOVA) for intergroup comparisons.
Results were considered statistically significant at p <= 0.05. Results Both appliance types resulted in significant cephalometric changes in the maxilla and mandible. Compared to the strictly tooth-borne appliances, the combined tooth-and bone-borne appliances were found to cause more pronounced advancement of the maxilla (SNA angle) notably among the Class III patients.
Conclusions Hybrid (combined tooth-and bone-borne) appliances for rapid maxillary expansion might be preferable in the treatment of skeletal Class III patients, since they possibly exert a more pronounced skeletal effect on the sagittal position of the maxilla.

• 出版日期2016-9