Ramstad T, Jendal T
Department of Plastic Surgery, Rikshospitalet, Oslo, Norway.
J Oral Rehabil. 1997 Sep;24(9):658-65. doi: 10.1046/j.1365-2842.1997.00551.x.
The aim of this study was to investigate the long term post-treatment transverse stability of the maxillary dental arch in subjects with unilateral complete cleft lip and palate (UCLP) treated by the Harvold/Bøhn method of orthodontic expansion and prosthodontic retention. The treatment of 22 consecutive patients, primarily operated on during the period 1957-60, was completed at a mean age of 18.1 years by the provision of a fixed partial retention prosthesis across the cleft using the cleft side central incisor and canine only as abutment teeth. The cleft side lateral incisor was missing in each case. Dental casts were made at the time of abutment preparation and at six subsequent times with the final observation 13.5 years after treatment completion. Measurements of any shift in the transverse position of cleft side and non-cleft side canines, premolars and first molars were made on standardized photographs of the casts. A constructed anteroposterior palatal line served as 'midline' reference. A mean reduction of width at the final observation, as recorded from the palatal surface to the reference line, was for the cleft side canine: -0.4 mm, the premolar immediately distal to the prosthesis and the first molar: both -1.2 mm. The corresponding mean width reductions on the noncleft side were: canine -0.9 mm, premolar -1.2 mm, first molar -1.6 mm. The rate of movement towards the midline decreased linearly with In(time) for all variables (P < 0.02) but for the cleft side canine.
本研究的目的是调查采用哈沃德/博恩正畸扩弓和修复体固位方法治疗的单侧完全性唇腭裂（UCLP）患者治疗后上颌牙弓的长期横向稳定性。连续对22例患者进行治疗，这些患者主要在1957年至1960年期间接受手术，平均年龄18.1岁时完成治疗，通过仅使用裂隙侧中切牙和尖牙作为基牙，在裂隙处提供固定局部固位修复体。每例患者裂隙侧侧切牙均缺失。在制备基牙时以及随后的六个时间点制作牙模，最终观察在治疗完成后13.5年进行。在牙模的标准化照片上测量裂隙侧和非裂隙侧尖牙、前磨牙和第一磨牙横向位置的任何移动。构建的前后腭线作为“中线”参考。从腭面到参考线记录的最终观察时宽度的平均减小值为：裂隙侧尖牙：-0.4mm，紧邻修复体远中的前磨牙和第一磨牙：均为-1.2mm。非裂隙侧相应的平均宽度减小值为：尖牙-0.9mm，前磨牙-1.2mm，第一磨牙-1.6mm。除裂隙侧尖牙外，所有变量向中线移动的速率随时间的自然对数呈线性下降（P<0.02）。
