Department of Diagnosis and Surgery, School of Dentistry of Araraquara, São Paulo State University (UNESP), Araraquara, SP, Brazil.
Braz Oral Res. 2009 Apr-Jun;23(2):137-43. doi: 10.1590/s1806-83242009000200008.
The purpose of the present study was to evaluate, using a biomechanical test, the force needed to remove implants with surface modification by laser (Nd:YAG) in comparison with implants with machined surfaces. Twenty-four rabbits received one implant with each surface treatment in the tibia, machined surface (MS) and laser-modified surface (LMS). After 4, 8 and 12 weeks of healing, the removal torque was measured by a torque gauge. The surfaces studied were analyzed according to their topography, chemical composition and roughness. The average removal torque in each period was 23.28, 24.0 and 33.85 Ncm for MS, and 33.0, 39.87 and 54.57 Ncm for LMS, respectively. The difference between the surfaces in all periods of evaluation was statistically significant (p < 0.05). Surface characterization showed that a deep and regular topography was provided by the laser conditioning, with a great quantity of oxygen ions when compared to the MS. The surface micro-topography analysis showed a statistical difference (p < 0.01) between the roughness of the LMS (R(a) = 1.38 +/- 0.23 microm) when compared to that of the MS (R(a) = 0.33 +/- 0.06 microm). Based on these results, it was possible to conclude that the LMS implants' physical-chemical properties increased bone-implant interaction when compared to the MS implants.
本研究旨在通过生物力学测试评估激光（Nd:YAG）表面改性种植体与机械加工表面种植体在去除时所需的力。24 只兔子的胫骨中分别植入了具有表面改性（LMS）和机械加工表面（MS）的种植体。在愈合的 4、8 和 12 周后，用扭矩计测量了去除扭矩。根据形貌、化学成分和粗糙度分析了研究的表面。在每个时期的平均去除扭矩分别为 MS 为 23.28、24.0 和 33.85 Ncm，LMS 为 33.0、39.87 和 54.57 Ncm。在所有评估期间，两种表面之间的差异均具有统计学意义（p<0.05）。表面特征表明，激光处理提供了一种深度和规则的形貌，与 MS 相比，存在大量的氧离子。表面微观形貌分析显示，LMS（R(a)=1.38 +/- 0.23 微米）的粗糙度与 MS（R(a)=0.33 +/- 0.06 微米）的粗糙度之间存在统计学差异（p<0.01）。基于这些结果，可以得出结论，与 MS 种植体相比，LMS 种植体的物理化学性质增加了骨-种植体的相互作用。
