Diedrich P R, Fuhrmann R A, Wehrbein H, Erpenstein H
Department of Orthodontics, Medical Faculty, Rheinisch-Westfalisch Technische Hochschule Aachen, Germany.
Am J Orthod Dentofacial Orthop. 1996 Apr;109(4):355-60. doi: 10.1016/s0889-5406(96)70116-6.
In 24 patients with missing molar teeth in the upper and/or in the lower jaw, 32 premolars were distalized. The mean orthodontic distalizing distance was 9.4 mm (SD 2.6). After distalization all these teeth served as posterior abutments for fixed restorations. The investigation period ranged between 2.5 to 14.1 years, average 9.6 years (SD 3.2). The clinical examination criteria were sensitivity, mobility, probing depth, sulcus bleeding index; the radiologic criteria were root resorption (lateral and apical) marginal bone level and axial position. None of the 32 premolar abutments were lost during investigation period. All the teeth maintained their vitality. The measured probing depths and sulcus bleeding indices were low. Of the teeth tested 40.6% revealed localized lateral root resorption on the pressure side; the average postorthodontic depth of root resorption was 0.7 mm (SD 0.3), and the length 2.3 mm (SD 0.6). The follow-up examination revealed a partial repair of the lateral root lesions. The extent of apical root resorption amounted to 0.9 mm (SD 1.1). The marginal bone level showed a bone loss of 0.5 mm mesially and 0.2 mm distally. The findings confirm that the distalized premolar functioning as a posterior bridge abutment represents a prognostically favorable alternative to an implant.
在24例上下颌有磨牙缺失的患者中，对32颗前磨牙进行了远中移动。正畸远中移动的平均距离为9.4毫米（标准差2.6）。远中移动后，所有这些牙齿均作为固定修复体的后牙基牙。研究期为2.5至14.1年，平均9.6年（标准差3.2）。临床检查标准包括敏感性、松动度、探诊深度、龈沟出血指数；放射学标准包括牙根吸收（侧方和根尖）、边缘骨水平和轴向位置。在研究期间，32颗前磨牙基牙无一缺失。所有牙齿均保持活力。测得的探诊深度和龈沟出血指数较低。在测试的牙齿中，40.6%在压力侧出现局限性侧方牙根吸收；正畸后牙根吸收的平均深度为0.7毫米（标准差0.3），长度为2.3毫米（标准差0.6）。随访检查发现侧方牙根病变有部分修复。根尖牙根吸收的程度为0.9毫米（标准差1.1）。边缘骨水平显示近中骨吸收0.5毫米，远中骨吸收0.2毫米。这些结果证实，远中移动的前磨牙作为后桥基牙，在预后方面是种植体的一个有利替代方案。
