Anitua Eduardo, Piñas Laura, Orive Gorka
Implantology and Oral Rehabilitation, Vitoria, Spain; Biotechnology Institute (BTI), Vitoria, Spain.
Clin Implant Dent Relat Res. 2015 Feb;17(1):102-10. doi: 10.1111/cid.12073. Epub 2013 May 8.
The aim of this study is to evaluate the influence of crown-to-implant (CI) ratio as well as other surgical, prosthetic and biomechanical variables on marginal bone loss (MBL) and on the survival rates of implant-supported prostheses in short implants (≤8.5 mm in length) placed in posterior areas of maxilla and mandible.
MATERIAL & METHODS: This was a retrospective study based on clinical charts and follow-up recordings from a single private practice over a period of 10 years. Patients rehabilitated in the posterior region of the jaws by means of prostheses supported by implants of ≤8.5 mm length were included. Patients-related, surgery-related. and implant-related variables, as well as other prosthetic and biomechanical variables. were registered. The data were split into two groups according to the value of CI ratio (CI < 2 and CI ≥ 2). MBL was measured from radiographs using an image analysis software. Implant and prosthesis survival rates were recorded.
One hundred twenty-eight short implants placed in 63 patients were evaluated. The mean follow-up period was 21.88 months (standard deviation (SD): 22.9, range 7-113 months). Eighty-six implants (67.2%) had a CI ratio of <2, whereas it was ≥2 in 42 implants (32.8%). The mean value of CI ratio was 1.82 (SD: 0.42; range 1.04-3.31). The average MBL after 1 year of follow-up was 0.35 (SD: 0.50), and it was 0.45 (SD: 0.46) mm for subsequent evaluations. Survival rates of implants and prosthesis were 100%. The presence of a cantilever had a negative influence on the first year MBL (p < .05).
The CI ratio had not a significant influence on MBL in Biotechnology Institute (BTI; Vitoria, Spain) short implants humidified with PRGF-Endoret and placed in posterior areas. The only variable that showed a significant negative influence on first year postloading MBL was the use of cantilever for rehabilitations.
本研究旨在评估冠根比（CI）以及其他手术、修复和生物力学变量对上颌和下颌后部植入的短种植体（长度≤8.5mm）的边缘骨丢失（MBL）和种植体支持修复体生存率的影响。
这是一项回顾性研究，基于一家私人诊所10年间的临床图表和随访记录。纳入通过长度≤8.5mm的种植体支持修复体修复颌骨后部区域的患者。记录与患者、手术和种植体相关的变量，以及其他修复和生物力学变量。根据CI比值（CI<2和CI≥2）将数据分为两组。使用图像分析软件从X线片测量MBL。记录种植体和修复体的生存率。
评估了63例患者植入的128枚短种植体。平均随访期为21.88个月（标准差（SD）：22.9，范围7 - 113个月）。86枚种植体（67.2%）的CI比值<2，而42枚种植体（32.8%）的CI比值≥2。CI比值的平均值为1.82（SD：0.42；范围1.04 - 3.31）。随访1年后的平均MBL为0.35（SD：0.50），后续评估时为0.45（SD：0.46）mm。种植体和修复体的生存率均为100%。悬臂的存在对第一年的MBL有负面影响（p<.05）。
在西班牙维多利亚生物技术研究所（BTI），用PRGF-Endoret湿润并植入后部区域的短种植体中，CI比值对MBL没有显著影响。对加载后第一年MBL显示出显著负面影响的唯一变量是修复时使用悬臂。
