Goto Sho, Hasegawa Yuh, Miyagawa Yukio, Endo Toshiya
Orthodontics and Dentofacial Orthopedics, Field of Oral and Maxillofacial Growth and Development, Course of Clinical Science, The Nippon Dental University Graduate School of Life Dentistry at Niigata, 1-8 Hamaura-cho, 951-8580, Chuo-ku, Niigata, Japan.
Department of Orthodontics, The Nippon Dental University School of Life Dentistry at Niigata, 1-8 Hamaura-cho, 951-8580, Chuo-ku, Niigata, Japan.
J Orofac Orthop. 2020 Mar;81(2):79-88. doi: 10.1007/s00056-019-00202-9. Epub 2019 Dec 18.
To assess the effect of the contact compressive force to seat orthodontic brackets on shear bond strength (SBS) and adhesive thickness using adhesive resins with different viscosities.
A total of 184 premolars were divided equally into eight groups of 23. Transbond XT and Beauty Ortho Bond paste viscous self-etching adhesive systems were used with contact compressive forces of 0.5, 1, 2, and 3 N (groups 1-4 and groups 5-8, respectively) via a push-pull tension gauge. SBS and adhesive thickness were measured in each adhesive system for each contact compressive force.
Significant differences existed in the SBSs between the adhesive systems for each contact compressive force and the SBSs were significantly higher in groups 1 (17 MPa) and 2 (16 MPa) than in groups 3 (14 MPa) and 4 (13 MPa). Significant differences existed for the adhesive thickness between the adhesive systems for the three contact compressive forces less than 3 N. The adhesive in group 1 (0.184 mm) was significantly thicker than that in groups 2-4 (from 0.098 to 0.129 mm). In groups 2 (0.129 mm) and 3 (0.121 mm) it was thicker than in group 4 (0.098 mm), and in group 5 (0.119 mm) it was thicker than in groups 6-8 (from 0.087 to 0.088 mm).
The high-viscosity adhesive Transbond XT exhibited higher SBSs than the low-viscosity Beauty Ortho Bond paste. For the adhesive Transbond XT, lower contact compressive forces produced greater adhesive thicknesses and higher SBSs. For the Beauty Ortho Bond paste, no significant changes in the adhesive thickness or SBS values were observed for contact compressive forces greater than 0.5 N.
使用不同粘度的粘结树脂，评估正畸托槽就位时接触压力对剪切粘结强度（SBS）和粘结剂厚度的影响。
将184颗前磨牙平均分为8组，每组23颗。通过推拉式张力计，分别对Transbond XT和Beauty Ortho Bond糊剂粘性自酸蚀粘结系统施加0.5、1、2和3 N的接触压力（分别为第1 - 4组和第5 - 8组）。测量每个粘结系统在每种接触压力下的SBS和粘结剂厚度。
每种接触压力下，粘结系统之间的SBS存在显著差异，第1组（17 MPa）和第2组（16 MPa）的SBS显著高于第3组（14 MPa）和第4组（13 MPa）。在小于3 N的三种接触压力下，粘结系统之间的粘结剂厚度存在显著差异。第1组（0.184 mm）的粘结剂明显厚于第2 - 4组（0.098至0.129 mm）。第2组（0.129 mm）和第3组（0.121 mm）的粘结剂比第4组（0.098 mm）厚，第5组（0.119 mm）的粘结剂比第6 - 8组（0.087至0.088 mm）厚。
高粘度粘结剂Transbond XT比低粘度的Beauty Ortho Bond糊剂表现出更高的SBS。对于粘结剂Transbond XT，较低的接触压力产生更大的粘结剂厚度和更高的SBS。对于Beauty Ortho Bond糊剂，当接触压力大于0.5 N时，粘结剂厚度或SBS值未观察到显著变化。
