Private Practice, Implant Dentistry Centre, Boston, MA, USA.
Clin Oral Implants Res. 2014 Feb;25(2):e179-88. doi: 10.1111/clr.12087. Epub 2012 Dec 20.
To evaluate the effect of opposing structures in crestal bone levels around single-tooth implants.
A retrospective cohort study design was conducted. Descriptive statistics, univariate and multifactor mixed-effects regression models, adjusted for multiple implants in the same patient were utilized to evaluate the effect of opposing structures in crestal bone levels after insertion of single-tooth replacements.
Eighty-one subjects who received 320 Bicon implants were included in the present study. Two hundred and thirty-one implant restorations were opposing natural teeth, 75 implants were opposing implant-supported restorations, 10 implants had no opposing structure and four implants were opposed by a complete denture. The average change in crestal bone levels overtime (AvBL) on implants opposing natural teeth and implant-supported restorations was -0.20 and -0.62 mm, respectively. Hydroxyapatite-coated (HA) mandibular implants opposing natural teeth demonstrated AvBL of +0.01 (indicating bone gain), whereas titanium-plasma sprayed (TPS)-coated mandibular implants opposing implants restored with composite abutment bases demonstrated AvBL of -1.95 mm. When the structure opposing an HA-coated mandibular implant was a natural tooth, it was a predictor of peri-implant bone gain (P = 0.007). While TPS-coated mandibular implants, which had been restored with composite abutment bases, were correlated with peri-implant bone loss when opposed by implant-supported restorations (P = 0.003).
This study suggests that the type of opposing structure plays a significant role in mandibular crestal bone levels surrounding single-tooth implants following crown insertion but this effect differ around implants with dissimilar surface coatings and can be exacerbated by local irritating factors.
评估单颗种植体周围嵴顶骨水平中对抗结构的影响。
进行了一项回顾性队列研究设计。利用描述性统计、单变量和多因素混合效应回归模型,对同一患者的多个种植体进行调整,评估单颗牙种植体植入后对抗结构对嵴顶骨水平的影响。
本研究共纳入 81 名接受 320 个 Bicon 种植体的患者。231 个种植体修复体与天然牙相对,75 个种植体与种植体支持的修复体相对,10 个种植体没有对抗结构,4 个种植体与全口义齿相对。种植体与天然牙和种植体支持修复体相对时,骨吸收的平均变化(AvBL)分别为-0.20 和-0.62mm。羟基磷灰石(HA)涂层下颌种植体与天然牙相对时,AvBL 为+0.01(表示骨量增加),而钛等离子喷涂(TPS)涂层下颌种植体与复合基台修复的种植体相对时,AvBL 为-1.95mm。当 HA 涂层下颌种植体的对抗结构为天然牙时,它是种植体周围骨量增加的预测因素(P=0.007)。而 TPS 涂层下颌种植体,与复合基台修复的种植体相对时,与种植体周围骨量丢失相关(P=0.003)。
本研究表明,在牙冠植入后,对抗结构的类型在单颗种植体周围下颌嵴顶骨水平中起着重要作用,但这种影响在不同表面涂层的种植体周围有所不同,并且可以被局部刺激因素加剧。