肩台转换种植体开放式愈合对种植体周颈部骨组织改建的影响

Clinical study of the influence on marginal bone levers when open healing of implants with platform switching

目的:评估肩台转换(PS)种植体开放式愈合(OH)方式对种植体周围颈部骨组织改建的影响。方法:选择下颌双侧第一磨牙缺失的患者48例,每例患者植入1枚PS种植体,随机选用开放或埋入式愈合(SH)。在种植体植入时、植入3个月转移时、安装上部结构修复完成时、种植修复完成后6、12和24个月这六个阶段进行X线检查,以评估种植体周围颈部骨组织的变化情况(ΔIBL)。结果:种植修复完成后6个月后,ΔIBL的值是(-0.25±0.08)mm(开放组)和(-0.26±0.12)mm(埋入组);12个月后,ΔIBL的值是(-0.29±0.13)mm(开放组)和(-0.31±0.14)mm(埋入组);24个月后,ΔIBL的值是(-0.34±0.15)mm(开放组)和(-0.33±0.11)mm(埋入组)。结论:PS种植体在开放或埋入式不同愈合方式下,其周围骨水平的变化没有统计学意义差异。愈合方式对种植体周围颈部骨组织改建没有影响。

Objective The study examined the influence on marginal bone levers at implants which implants were assigned to open healing and implant-abutment connection restored according to a platform-switching concept. Methods One implant were placed in the first molar of mandible of 48 patients , randomly assigned to open （OH） or submerge （SH） healing. Standardized radiographs were obtained after implant surgery, when implant transfer and crown mounting, and 6 ,12 and 24 months after implants restoration, then evaluated for implant-bone-lever alterations（ΔIBL）. Results After 6 months after implants restoration,ΔIBL were （-0.25 ± 0.08）mm mm（OH）and （-0.26 ± 0.12）mm（SH）. After 12 months follow-up, ΔIBL were （-0.29 ± 0.13）mm （OH）and （-0.31 ± 0.14） mm（SH）, and after 24 months later, ΔIBLwere （-0.34 ± 0.15）mm（OH）and （-0.33 ± 0.11）mm （SH）. Conclusions Platform-switched implants showed very limited peri-implant bone-lever alterations. The healing-mode neither affected the total amount nor the temporal patterns of ΔIBL.