Schneidman E, Wilson S, Erkis R
Dept. of Pediatric Dentistry, Ohio State University, Columbus.
Pediatr Dent. 1990 Apr-May;12(2):92-7.
Rapid palatal expansion (RPE) causes separation of the lateral halves of the palate and traditionally has used four maxillary teeth as anchorage. The purpose of this study was to introduce a rapid palatal expander that requires only two anchor teeth (two-point RPEe) and to compare the expansion obtained with that from a Hyrax appliance. This study involved two groups of 25 children aged 7 to 15 years who were treated in a private orthodontist's office with either a Hyrax appliance or a two-point RPEe. Dental casts and occlusal radiographs were made before treatment and at least three months after stabilization of the appliance. Paired t-tests were performed to identify significant intragroup changes, and independent t-tests were performed to determine intergroup differences. The findings showed the two-point RPEe was as efficient as the Hyrax in obtaining dental expansion of the maxillary posterior teeth with less effect on the maxillary anterior and mandibular teeth. Therefore, the two-point RPEe may be useful in certain clinical situations.
快速腭扩展（RPE）会导致腭部两侧分离，传统上使用四颗上颌牙齿作为支抗。本研究的目的是介绍一种仅需两颗支抗牙的快速腭扩展器（两点式RPEe），并将其获得的扩展效果与Hyrax矫治器的效果进行比较。本研究纳入了两组年龄在7至15岁的儿童，每组25名，他们在一家私人正畸诊所分别接受Hyrax矫治器或两点式RPEe治疗。在治疗前以及矫治器稳定至少三个月后制作牙模和咬合根尖片。采用配对t检验来确定组内的显著变化，并采用独立t检验来确定组间差异。研究结果表明，两点式RPEe在使上颌后牙获得牙齿扩展方面与Hyrax矫治器同样有效，对上颌前牙和下颌牙齿的影响较小。因此，两点式RPEe在某些临床情况下可能有用。
