Raucci Gaetana, Pachêco-Pereira Camila, Grassia Vincenzo, d'Apuzzo Fabrizia, Flores-Mir Carlos, Perillo Letizia
a Postgraduate Orthodontic student, Multidisciplinary Department of Medica-Surgical and Dental Specialties, Second University of Naples, Italy, Naples, Italy.
b MSc student, Department of Dentistry, University of Alberta, Edmonton, Alberta, Canada.
Angle Orthod. 2015 Jul;85(4):683-9. doi: 10.2319/070114-466.1. Epub 2014 Oct 6.
To evaluate short- and long-term maxillary dental arch dimensional changes in patients treated with a transpalatal arch (TPA) during mixed dentition followed by full fixed appliances in the permanent dentition compared with an untreated sample.
Dental casts and lateral cephalograms obtained from 36 consecutively treated patients before TPA treatment (T0), after TPA treatment (T1), after fixed appliance treatment (T2), and a minimum of 3 years after fixed appliance treatment (T3) were analyzed. The control group was matched as closely as possible. Arch widths, perimeter, and length, as well as crowding and incisor proclination, were evaluated.
In the treated group, intercanine, interpremolar, and intermolar widths and arch perimeter increased significantly at T1. At T2, only the intercanine width increase was still significant. At T3 all arch dimensions decreased, remaining larger than they were at T0. The arch length increased after T1, significantly decreased at T2, and slightly decreased at T3. The crowding decreased significantly at T1, was eliminated at T2, and increased at T3. At T3, 50% of the patients showed relapse with crowding ranging from 0.5 to 2 mm. In the control group at T1, only slight changes were noted but crowding increased. At T2, crowding and upper incisor inclination increased but arch length decreased. At T3, intercuspid width, arch perimeter, and arch length continued to decrease, thereby increasing crowding.
Maxillary dental arch dimensions changed significantly after TPA followed by treatment with fixed appliances. Relapse occurred to some extent, especially in intercanine width and arch perimeter, but most of the dental arch changes remained stable.
评估在混合牙列期接受跨腭弓（TPA）治疗，随后在恒牙列期使用全固定矫治器治疗的患者与未治疗样本相比，上颌牙弓的短期和长期尺寸变化。
分析从36例连续接受治疗的患者在TPA治疗前（T0）、TPA治疗后（T1）、固定矫治器治疗后（T2）以及固定矫治器治疗后至少3年（T3）获得的石膏模型和头颅侧位片。对照组尽可能进行匹配。评估牙弓宽度、周长和长度，以及牙列拥挤度和切牙倾斜度。
在治疗组中，T1时尖牙间、前磨牙间和磨牙间宽度以及牙弓周长显著增加。T2时，只有尖牙间宽度增加仍显著。T3时所有牙弓尺寸减小，但仍大于T0时。牙弓长度在T1后增加，T2时显著减小，T3时略有减小。牙列拥挤度在T1时显著降低，T2时消除，T3时增加。T3时，50%的患者出现复发，拥挤度为0.5至2毫米。在对照组中，T1时仅观察到轻微变化，但牙列拥挤度增加。T2时，牙列拥挤度和上切牙倾斜度增加，但牙弓长度减小。T3时，尖牙间宽度、牙弓周长和牙弓长度继续减小，从而增加了牙列拥挤度。
TPA治疗后再使用固定矫治器治疗，上颌牙弓尺寸发生显著变化。在一定程度上出现了复发，尤其是尖牙间宽度和牙弓周长，但大多数牙弓变化保持稳定。
