Caetano Gustavo M, Pauletto Patrícia, Mezzomo Luis A, Rivaldo Elken G
Department of Dentistry, Lutheran University of Brazil, Canoas-RS, Brazil.
Department of Dentistry, Federal University of Santa Catarina, Florianópolis-SC, Brazil.
Eur J Dent. 2019 Oct;13(4):497-502. doi: 10.1055/s-0039-1697216. Epub 2019 Dec 31.
Several modifications, such as changes in the implant-abutment connection, have been suggested in studies on dental implants to better preserve the peri-implant bone level. The aim of this study was to prospectively compare crestal bone level changes between two different implant designs-tissue level (TL) and bone level (BL).
The sample comprised 18 patients, on whom a total of 30 hydrophilic tissue- and bone level implants were placed (SLActive, Straumann Institut AG, Basel, Switzerland), in the posterior region of the maxilla or the mandible. Impressions were taken after 45 days of healing. Then, cemented-retained metalloceramic crowns were fabricated and installed. Marginal bone level changes were assessed by the paralleling technique of periapical radiographies, on both mesial and distal aspects of each implant, at the moment of the implant placement and after 1 year of loading. Photoshop software was used to perform linear measurements by a single and calibrated examiner.
The Mann-Whitney test at a 5% significance level was used to compare the bone changes among the implants assessed.
A significantly lower ( = 0.048) bone remodeling was observed on bone level implants (0.05 mm), when compared to tissue level implants (0.47 mm; = 0.048). The average marginal bone level changes at the distal aspect did not show any statistically significant difference ( = 0.325).
Tissue level implants presented greater bone loss in the mesial surface than bone level implants. Both designs presented stable and clinically acceptable bone crests.
在牙种植体研究中，已提出多种改进措施，如种植体-基台连接的改变，以更好地保留种植体周围骨水平。本研究的目的是前瞻性比较两种不同种植体设计——软组织水平（TL）和骨水平（BL）——之间嵴顶骨水平的变化。
样本包括18例患者，共植入30颗亲水性软组织和骨水平种植体（SLActive，瑞士巴塞尔的Straumann Institut AG），位于上颌或下颌后部区域。愈合45天后取印模。然后制作并安装粘结固位的金属烤瓷冠。在种植体植入时和加载1年后，通过根尖片平行技术评估每个种植体近中和远中面的边缘骨水平变化。由一名经过校准的检查者使用Photoshop软件进行线性测量。
采用5%显著性水平的Mann-Whitney检验比较评估的种植体之间的骨变化。
与软组织水平种植体（0.47mm；P = 0.048）相比，骨水平种植体（0.05mm）的骨重塑明显更低（P = 0.048）。远中面的平均边缘骨水平变化未显示任何统计学显著差异（P = 0.325）。
软组织水平种植体在内侧面的骨丢失比骨水平种植体更多。两种设计均呈现稳定且临床上可接受的骨嵴。
