Department of Oral and Maxillofacial Surgery, Johannes Gutenberg University Mainz, Augustusplatz 2, Mainz, Germany.
Clin Implant Dent Relat Res. 2011 Mar;13(1):71-8. doi: 10.1111/j.1708-8208.2009.00185.x.
Modifications of implant design have been intending to improve primary stability. However, little is known about investigation of a hybrid self-tapping implant on primary stability.
The aims of this study were to evaluate the primary stability of two hybrid self-tapping implants compared to one cylindrical non-self-tapping implant, and to elucidate the relevance of drilling protocols on primary stability in an ex vivo model.
Two types of hybrid self-tapping implants (Straumann® Bone Level implant [BL], Straumann® Tapered Effect implant [TE]) and one type of cylindrical non-self-tapping implant (Straumann® Standard Plus implant [SP]) were investigated in the study. In porcine iliac cancellous bones, 10 implants each were inserted either using standard drilling or under-dimensioned drilling protocol. The evaluation of implant-bone interface stability was carried out by records of maximum insertion torque, the Periotest® (Siemens, Bensheim, Germany), the resonance frequency analysis (RFA), and the push-out test.
In each drilling group, the maximum insertion torque values of BL and TE were significantly higher than SP (p=.014 and p=.047, respectively). In each group, the Periotest values of TE were significantly lower than SP (p=.036 and p=.033, respectively). The Periotest values of BL and TE were significantly lower in the group of under-dimensioned drilling than standard drilling (p=.002 and p=.02, respectively). In the RFA, no statistical significances were found in implants between two groups and between implants in each group. In each group, the push-out values of BL and TE were significantly higher than SP (p=.006 and p=.049, respectively).
Hybrid self-tapping implants could achieve a high primary stability which predicts them for use in low-density bone. However, there is still a debate to clarify the influence of under-dimensioned drilling on primary stability.
为了提高初期稳定性，种植体的设计已进行了多种改良。然而，对于自攻式混合种植体初期稳定性的研究却知之甚少。
本研究旨在评估两种自攻式混合种植体（Straumann® Bone Level 种植体[BL]、Straumann® Tapered Effect 种植体[TE]）与一种圆柱形非自攻式种植体（Straumann® Standard Plus 种植体[SP]）的初期稳定性，并通过体外模型阐明不同钻孔方案对初期稳定性的影响。
在猪髂骨松质骨中，每种类型的种植体各植入 10 个，分别采用标准钻孔或欠尺寸钻孔方案进行植入。采用最大植入扭矩、Periotest®（西门子，德国班海姆）、共振频率分析（RFA）和推出试验记录来评估种植体-骨界面的稳定性。
在每个钻孔组中，BL 和 TE 的最大植入扭矩值均显著高于 SP（p=.014 和 p=.047）。在每组中，TE 的 Periotest 值均显著低于 SP（p=.036 和 p=.033）。欠尺寸钻孔组中 BL 和 TE 的 Periotest 值均显著低于标准钻孔组（p=.002 和 p=.02）。在 RFA 中，两组之间、每组内各种植体之间均未发现统计学差异。在每组中，BL 和 TE 的推出值均显著高于 SP（p=.006 和 p=.049）。
自攻式混合种植体可获得较高的初期稳定性，这预示着它们可用于骨密度较低的区域。然而，关于欠尺寸钻孔对初期稳定性的影响仍存在争议，有待进一步阐明。
