Finne Kaj, Rompen Eric, Toljanic Joseph
Int J Oral Maxillofac Implants. 2007 Mar-Apr;22(2):226-34.
The aim of the present investigation was to evaluate the marginal bone level after 1 year of follow-up of 1-piece implants after immediate provisional restoration fabrication.
Patients received NobelDirect and NobelPerfect 1-piece implants (Nobel Biocare, G6teborg, Sweden) that were immediately restored and placed into function as part of a 3-year, multicenter investigation. Life table analysis was used for evaluation of implant cumulative survival rates. The Student t test (for dichotomous variables) and Pearson correlation (for continuous and ordered categorical variables) were used to estimate the influence of separate parameters on marginal bone.
Eighty-seven patients received 152 NobelDirect or NobelPerfect 1-piece implants. Of these, 81 patients returned for the 1-year follow-up and 21 for the 2-year follow-up. Three implants were lost, resulting in a cumulative survival rate of 97.9% after up to 2 years. The average marginal bone level at implant placement was 0.33 mm (SD 1.20, n = 141) superior to the reference point (lower edge of the implant collar). Marginal bone level was -0.77 mm (SD 1.33, n = 138) at 6 months and -0.98 mm (SD 1.38, n = 123) at 1 year. Average bone level at the 2-year follow-up was 0.17 mm (SD 1.20, n = 26). After 1 year of loading, bone level in the maxilla was more apical compared to that in the mandible (P = .05), and a positive correlation was found between bone level at placement and bone level at 12 months (P = .008). Shallow implant positioning resulted in less marginal bone remodeling compared to deep implant positioning.
On the basis of this prospective multicenter study, stable marginal bone level and soft tissue support the hypothesis that the 1-piece implant has the capacity to preserve both hard and soft tissue.
本研究的目的是评估即刻临时修复体制作后1件式种植体随访1年时的边缘骨水平。
患者接受NobelDirect和NobelPerfect 1件式种植体（诺贝尔生物公司，瑞典哥德堡），这些种植体即刻进行修复并投入使用，作为一项为期3年的多中心研究的一部分。采用寿命表分析法评估种植体的累积生存率。使用Student t检验（用于二分变量）和Pearson相关性分析（用于连续和有序分类变量）来估计各个参数对边缘骨的影响。
87例患者接受了152颗NobelDirect或NobelPerfect 1件式种植体。其中，81例患者返回进行1年随访，21例患者返回进行2年随访。3颗种植体丢失，在长达2年的时间里累积生存率为97.9%。种植体植入时的平均边缘骨水平比参考点（种植体颈部下缘）高0.33 mm（标准差1.20，n = 141）。6个月时边缘骨水平为-0.77 mm（标准差1.33，n = 138），1年时为-0.98 mm（标准差1.38，n = 123）。2年随访时的平均骨水平为0.17 mm（标准差1.20，n = 26）。加载1年后，上颌骨的骨水平比下颌骨更靠近根尖（P = 0.05），并且在植入时的骨水平与12个月时的骨水平之间发现正相关（P = 0.008）。与深部种植体定位相比，浅部种植体定位导致的边缘骨重塑较少。
基于这项前瞻性多中心研究，稳定的边缘骨水平和软组织支持以下假设：1件式种植体有能力保留硬组织和软组织。
