Department of Oral and Maxillofacial Surgery, Mathrusri Ramabai Ambedkar Dental College and Hospital, Bengaluru, Karnataka, India, Phone: +91 7406533931, e-mail:
Department of Oral and Maxillofacial Surgery, Mathrusri Ramabai Ambedkar Dental College and Hospital, Bengaluru, Karnataka, India.
J Contemp Dent Pract. 2022 Jun 1;23(6):623-627. Print 2022 Sep 23.
The study aims at using the level/depth of implant placement (equicrestal or cretsal) as the key parameter in measuring the vertical crestal bone loss (CBL) mesially and distally, using periapical radiographs (IOPARs) taken at 1-, 3-, and 6-months interval, postprosthetic loading.
Patients ( = 40; 18-65 years), with edentulous space anteriorly or posteriorly, were randomly divided into two groups, namely, group I (equicrestal) and group II (subcrestal) with 20 patients in each group. Implants were placed at an edentulous site (delayed implants), after obtaining cone-beam computed tomography (CBCT) scans. Prosthetic loading (following osseointegration) was done within 3 months of implant placement. The patients were followed up and IOPAR were taken to measure CBL at 1-, 3-, and 6-months interval, postloading. The CBL between the two groups was compared using IOPARs. The data obtained was compiled and unpaired Student's -test was done for statistical analysis.
After the statistical analysis of the data obtained during follow-up, CBL was measured radiographically. Mesial and distal vertical bone loss was charted and compared between the two groups. The mean bone loss on the mesial aspect for group I implants is 0.39 mm and for group II implants, it is 0.27 mm, 6 months postloading, determined radiographically.
Subcrestally placed implants are conducive to the overall oral rehabilitation, as it has been seen to preserve marginal peri-implant bone for longer durations than their equicrestally placed counterparts, within the limitations of the current study.
The study prospectively relates the level of implant shoulder with respect to alveolar crestal bone, postloading. Following radiographic comparison between the two groups, significant clinical findings indicated that better esthetics and stability were seen in the subcrestally placed implants. This proves that implant placement level directly influences crestal bone levels; hence, indirectly affects esthetics and function.
本研究旨在使用种植体的水平/深度（平齐龈或龈下）作为关键参数，在种植体负重后 1、3 和 6 个月，通过根尖片（IOPAR）测量近中和远中颊侧骨吸收（CBL）。
患者（=40；18-65 岁），无牙颌空间位于前牙或后牙区，随机分为两组，即 I 组（平齐龈）和 II 组（龈下），每组 20 例。在获得锥形束 CT（CBCT）扫描后，在无牙区放置种植体。种植体植入后 3 个月内进行修复体加载。患者进行随访，在加载后 1、3 和 6 个月拍摄 IOPAR 测量 CBL。使用 IOPAR 比较两组之间的 CBL。编译获得的数据，并进行了非配对 Student's t 检验进行统计学分析。
在对随访期间获得的数据进行统计分析后，通过影像学测量 CBL。记录并比较了两组近中和远中颊侧垂直骨吸收情况。第 6 个月负重后，I 组种植体的近中颊侧平均骨吸收量为 0.39mm，II 组种植体的平均骨吸收量为 0.27mm。
龈下植入物有利于整体口腔修复，因为与平齐龈植入物相比，它在当前研究的限制范围内，能够更长时间地保持边缘种植体周围骨的完整性。
本研究前瞻性地研究了种植体肩部与负重后牙槽嵴骨的关系。通过对两组进行影像学比较，得出了显著的临床发现，即龈下植入物具有更好的美观和稳定性。这证明了种植体的放置水平直接影响牙槽嵴骨水平，从而间接影响美观和功能。
