Tey Valerie H S, Phillips Rachel, Tan Ken
National Dental Centre, Singapore, Singapore.
Singapore Clinical Research Institute, Singapore, Singapore.
Clin Oral Implants Res. 2017 May;28(5):620-625. doi: 10.1111/clr.12843. Epub 2016 Jun 22.
To determine the survival and the incidence of biologic and technical complications of implant-supported single crowns after 5 years of function.
Patients treated with dental implants at the National Dental Centre, Singapore, from 2006 to 2010 were recruited from the Implant Registry and evaluated by two clinicians. One hundred and ninety-four patients, with 266 implant single crowns (SCs), were examined clinically for biologic and technical parameters. Digital radiographs were also obtained. Failure and complication rates were calculated based on the person-time at risk.
The mean biologic time in function was 5.9 ± 1.3 years. None of the implants had been lost, resulting in a 5-year survival of 100%. The corresponding success (complication-free) rate was 92.9% (95% CI: 89.2, 95.4). The mean prosthetic time in function was 5.2 ± 1.5 years, with a 5-year survival of implant-supported SCs of 98.2% (95% CI: 95.8, 99.3). The corresponding success rate was 88.9% (95% CI: 84.8, 92.0). The 5-year incidence of biologic complications, defined as PPD ≥6 mm with bleeding on probing/suppuration, in the presence of ≥2.5 mm of radiographic bone loss, was 7.1% (95% CI: 4.6, 10.9). The 5-year incidence of technical complications was 6.5% (95% CI: 3.9, 10.7) for fracture of the veneering material, 4.3% (95% CI: 2.4, 7.7) for loss of retention, 2.1% (95% CI: 1.0, 4.7) for abutment screw loosening and 0.4% (95% CI: 0.1, 2.5) for abutment fracture.
High survival rates (98.4%) for both the single tooth implants and the respective single crowns were demonstrated after 5.2 ± 1.5 years. However, the success rates were considerably lower (84.9%), indicating that biologic and technical complications were frequent.
确定种植体支持的单冠在功能行使5年后的存留率以及生物学和技术并发症的发生率。
从新加坡国立牙科中心2006年至2010年接受牙种植治疗的患者中，从种植体登记处招募患者，并由两名临床医生进行评估。对194例患者的266颗种植单冠（SCs）进行临床生物学和技术参数检查。还获取了数字化X线片。根据风险人时计算失败率和并发症发生率。
功能行使的平均生物学时间为5.9±1.3年。无一例种植体丢失，5年存留率为100%。相应的成功率（无并发症）为92.9%（95%可信区间：89.2，95.4）。功能行使的平均修复时间为5.2±1.5年，种植体支持的单冠5年存留率为98.2%（95%可信区间：95.8，99.3）。相应的成功率为88.9%（95%可信区间：84.8，92.0）。生物学并发症的5年发生率，定义为探诊深度≥6 mm且探诊出血/有溢脓，同时存在≥2.5 mm的影像学骨吸收，为7.1%（95%可信区间：4.6，10.9）。技术并发症的5年发生率，贴面材料骨折为6.5%（95%可信区间：3.9，10.7），固位丧失为4.3%（95%可信区间：2.4，7.7），基台螺丝松动为2.1%（95%可信区间：1.0，4.7），基台骨折为0.4%（95%可信区间：0.1，2.5）。
在5.2±1.5年后，单颗牙种植体和相应单冠均显示出较高的存留率（98.4%）。然而，成功率要低得多（84.9%），表明生物学和技术并发症很常见。
