Balshi T J, Hernandez R E, Pryszlak M C, Rangert B
Prosthodontics Intermadica, Institute for Factal Esthetics, Fort Washington, Pennsylvania 19034, USA.
Int J Oral Maxillofac Implants. 1996 May-Jun;11(3):372-8.
A comparative study between one and two Brånemark implants replacing a single molar was conducted. Forty-seven individuals comprised two groups of 22 patients treated with one implant and 25 with two implants. A total of 72 implants were placed, 66 (92%) in the mandible and six (8%) in the maxilla. After the first year of function, the success rate was 99%, with only one implant lost. Between the second- and third-year follow-ups, 100% of the implants continued to function in the remaining 46 patients, giving a 3-year cumulative success rate of 99%. The marginal bone loss between 1 and 3 years of function was 0.10 mm (SD 0.20) for the group with one implant and 0.24 mm (SD 0.20) for the group with two implants. No changes were observed in the Sulcus Bleeding Index during the 3-year follow-up. Prosthesis mobility or screw loosening was the most frequent complication and was predominant in the group using one implant (48%), but was substantially reduced in the group using two implants (8%). These mechanical problems, using one implant only, seem to be preventable using a stronger screw joint (CeraOne abutment). Precise centric occlusal contact was established and maintained over the study period, which was thought to contribute to the very high success rate for the single-implant-supported molars, despite their high degree of mechanical problems. This study suggests that implant-supported molars can be effective therapy, and the results confirm the biomechanical analysis that two implants provide more advantageous support than does one.
开展了一项关于单颗磨牙采用一枚或两枚Brånemark种植体进行修复的对比研究。47名个体分为两组，一组22例患者使用一枚种植体治疗，另一组25例患者使用两枚种植体治疗。共植入72枚种植体，其中66枚（92%）植入下颌骨，6枚（8%）植入上颌骨。在功能使用的第一年，成功率为99%，仅一枚种植体失败。在第二年至第三年的随访期间，其余46例患者的种植体100%持续发挥功能，3年累计成功率为99%。功能使用1至3年期间，一枚种植体组的边缘骨吸收为0.10 mm（标准差0.20），两枚种植体组为0.24 mm（标准差0.20）。在3年随访期间，龈沟出血指数未观察到变化。修复体松动或螺钉松动是最常见的并发症，在使用一枚种植体的组中最为突出（48%），但在使用两枚种植体的组中显著降低（8%）。仅使用一枚种植体时出现的这些机械问题，似乎可通过使用更强的螺钉连接（CeraOne基台）来预防。在研究期间建立并维持了精确的正中咬合接触，尽管单颗种植体支持的磨牙存在高度机械问题，但这被认为是其成功率极高的原因。本研究表明，种植体支持的磨牙可以是有效的治疗方法，结果证实了生物力学分析，即两枚种植体比一枚种植体提供更有利的支持。
