Tabrizi Reza, Shaban Nejhad Zeynab, Fayyazi Anahita, Moslemi Hamidreza, Shafiei Shervin
Dept. of Oral and Maxillofacial Surgery, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
Dental Student, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
J Dent (Shiraz). 2022 Sep;23(2 Suppl):383-386. doi: 10.30476/DENTJODS.2021.90990.1542.
Marginal bone loss (MBL) is an important factor in dental implant failure. The number of implants may affect MBL.
The aim of this study was to compare MBL in patients who received two or three implants for replacement of three missing teeth in the posterior mandible.
This prospective cohort study evaluated patients who required replacement of three missing teeth in the posterior mandible with dental implants. The patients were assigned to two groups. In the group 1, the edentulous area was restored with two implants and a pontic while three implants were placed for this purpose in the group 2. The MBL was compared between the two groups at 12 and 24 months after loading.
Forty-two implants were studied in group 1 and 36 implants in the group 2. The mean MBL was 0.90±0.12mm in the group 1 and 0.89±0.12mm in the group 2 at 12 months after loading. The mean MBL was 1.00±0.10mm in the group 1 and 0.98±0.10mm in the group 2 at 24 months after implant loading. The mean of MBL was not statistically different between the two groups at 12 months and 24 months (p> 0.05).
It seems that the use of two or three implants for replacement of three missing teeth in the posterior mandible is not associated with an increase in MBL.
边缘骨吸收（MBL）是牙种植失败的一个重要因素。种植体的数量可能会影响MBL。
本研究的目的是比较在下颌后牙区接受两颗或三颗种植体以替代三颗缺失牙的患者的MBL情况。
这项前瞻性队列研究评估了需要在下颌后牙区用牙种植体替代三颗缺失牙的患者。患者被分为两组。在第1组中，用两颗种植体和一个桥体修复无牙区，而在第2组中为此目的植入三颗种植体。在负重后12个月和24个月时比较两组之间的MBL。
第1组研究了42颗种植体，第2组研究了36颗种植体。负重后12个月时，第1组的平均MBL为0.90±0.12mm，第2组为0.89±0.12mm。种植体负重后24个月时，第1组的平均MBL为1.00±0.10mm，第2组为0.98±0.10mm。两组在12个月和24个月时的MBL平均值在统计学上无差异（p＞0.05）。
在下颌后牙区用两颗或三颗种植体替代三颗缺失牙似乎与MBL增加无关。
