de Oliveira Guilherme José Pimentel Lopes, Barros-Filho Luiz Antônio Borelli, Barros Luiz Antônio Borelli, Queiroz Thalita Pereira, Marcantonio Elcio
1 Section of Periodontology, Department of Diagnosis and Surgery, School of Dentistry at Araraquara-Universidade Estadual Paulista, Araraquara, SP, Brazil.
2 Section of Clinics, Department of Oral Social Health, School of Dentistry at Araraquara- Universidade Estadual Paulista, Araraquara, SP, Brazil.
J Oral Implantol. 2016 Dec;42(6):458-463. doi: 10.1563/aaid-joi-D-16-00094. Epub 2016 Jul 25.
The objective of this study was to evaluate the primary stability of short and conventional dental implants with different platform types at different site densities in vitro. One hundred twenty implants were placed in polyurethane blocks that simulate different bone densities (bone types I and IV). The implants were divided into 10 groups, with 12 implants each according to the type of prosthetic connections (external hexagon, EH; morse taper, MT) and size of the implants (conventional: 4 × 10 mm; short: 5 × 5, 5.5 × 5, 5 × 6, and 5.5 × 6 mm). Insertion torque and resonance frequency analyses were performed to evaluate the primary stability. The Kruskal-Wallis test complemented by Dunn's test and the Mann-Whitney test were used for statistical analysis. These tests were applied at the confidence level of 95% (P < .05). The implants installed in blocks with density type IV exhibited reduced insertion torque compared with implants placed in blocks with density type I. Short implants with EH exhibited increased insertion torque compared with short implants with MT in blocks with bone density type I. In general, implants installed in blocks with density type I exhibited greater primary stability. The short implants with EH with a 5.5-mm diameter and the short implants with MT with a 5-mm diameter exhibited reduced primary stability. No differences between short and conventional implants were noted. Short implants have primary stability and insertion torque at least equivalent to conventional implants irrespective of the platform type and density of the site.
本研究的目的是在体外评估不同平台类型、不同部位密度的短种植体和传统种植体的初期稳定性。将120枚种植体植入模拟不同骨密度（I型和IV型骨）的聚氨酯块中。根据修复连接类型（外六角形，EH；莫氏锥度，MT）和种植体尺寸（传统型：4×10 mm；短型：5×5、5.5×5、5×6和5.5×6 mm）将种植体分为10组，每组12枚。进行植入扭矩和共振频率分析以评估初期稳定性。采用Kruskal-Wallis检验并辅以Dunn检验和Mann-Whitney检验进行统计分析。这些检验在95%置信水平（P <.05）下应用。与植入I型密度块中的种植体相比，植入IV型密度块中的种植体的植入扭矩降低。在I型骨密度块中，与采用MT的短种植体相比，采用EH的短种植体的植入扭矩增加。总体而言，植入I型密度块中的种植体表现出更大的初期稳定性。直径为5.5 mm的采用EH的短种植体和直径为5 mm的采用MT的短种植体的初期稳定性降低。短种植体和传统种植体之间未观察到差异。无论平台类型和种植部位的密度如何，短种植体的初期稳定性和植入扭矩至少与传统种植体相当。
