Palacios-Garzón Natalia, Mauri-Obradors Elisabeth, Ayuso-Montero Raúl, Velasco-Ortega Eugenio, Anglada-Cantarell José María, López-López José
Faculty of Medicine and Health Sciences (Dentistry), University of Barcelona, 08907 L'Hospitalet de Llobregat, Spain.
Oral Health and Masticatory System Group, Bellvitge Biomedical Research Institute IDIBELL, University of Barcelona, 08907 Barcelona, Spain.
Materials (Basel). 2022 May 23;15(10):3729. doi: 10.3390/ma15103729.
The vertical position concerning the bone in which the implants are placed has been related as one of the factors causing marginal bone loss. The objective of this study was to evaluate the bone loss that occurs before prosthetic loading around tapered internal connection (CIC) implants placed at the crestal (C) and subcrestal (S) levels.
A randomized clinical trial (RCT) was carried out, with a sample size of 62 implants placed in 27 patients who underwent radiological controls on the day of placement, at one month, and at 4 months, and stability was measured by resonance frequency analysis (RFA) on three occasions.
Bone loss in implants C and S from the time of placement (T0) and the month after (T1) was not significant ( = 0.54) (C = 0.19 mm and S = 0.15 mm). The difference between one month (T1) and four months (T2) (C = 0.17 mm and S = 0.22 mm) was not significant either ( = 0.26). The difference between the day of placement (T0) and the third and last measurement (T2) was almost null ( = 0.94) (C = 0.35 mm and S = 0.36). The overall success rate of the implants was 97.8%. The stability of the implants measured with RFA went from 70.60 (T0) to 73.16 (T1) and 74.52 (T2).
No significant differences were found in the bone loss for implants placed at the C and S levels. The millimeters of bone loss detected in both vertical positions did not have a significant impact on the stability of the implants.
种植体植入骨内的垂直位置被认为是导致边缘骨丢失的因素之一。本研究的目的是评估在牙嵴顶（C）和牙嵴顶以下（S）水平植入的锥形内部连接（CIC）种植体在修复体加载前发生的骨丢失情况。
进行了一项随机临床试验（RCT），样本包括为27例患者植入的62颗种植体，在植入当天、1个月和4个月时进行影像学检查，并通过共振频率分析（RFA）在三个时间点测量稳定性。
种植体C和S从植入时（T0）到植入后1个月（T1）的骨丢失不显著（P = 0.54）（C = 0.19毫米，S = 0.15毫米）。1个月（T1）和4个月（T2）之间的差异也不显著（P = 0.26）（C = 0.17毫米，S = 0.22毫米）。植入当天（T0）与第三次也是最后一次测量（T2）之间的差异几乎为零（P = 0.94）（C = 0.35毫米，S = 0.36毫米）。种植体的总体成功率为97.8%。用RFA测量的种植体稳定性从70.60（T0）提高到73.16（T1）和74.52（T2）。
在C和S水平植入的种植体在骨丢失方面未发现显著差异。在两个垂直位置检测到的骨丢失毫米数对种植体的稳定性没有显著影响。
