Padunglappisit Chawal, Posaya-Anuwat Siwanath, Sompoch Varisara, Piyawiwattanakoon Poompat, Panpisut Piyaphong
Faculty of Dentistry, Thammasat University, Pathum Thani, Thailand.
Research Unit in Dental and Bone Substitute Biomaterials, Thammasat University, Pathum Thani, Thailand.
Eur J Dent. 2021 Jul;15(3):488-494. doi: 10.1055/s-0040-1721908. Epub 2021 Feb 3.
The aim was to assess the effect of different amine activators including N, N-dimethyl-p-toluidine (DMPT) or Na-N-tolyglycine glycidyl methacrylate (NTGGMA) on chemical-activated monomer conversion, biaxial flexural strength (BFS), and color stability of composites for provisional dental restorations.
Two formulations of composites containing either DMPT (D-temp) or NTGGMA (N-temp) were prepared. The degree of monomer conversion was assessed. The BFS of the materials was tested using the ball-on-ring testing jig. The color difference (∆E) of the materials after immersion in water was also determined. The commercial comparisons were Unifast (UF), Protemp (PT), Luxacrown, and Luxatemp (LT).
The monomer conversion of D-temp (57.4 ± 1.3%) was comparable to that of N-temp (59.0 ± 1.3%). The conversion of both D-temp and N-temp were higher than that of PT (48.1 ± 3.4%) and LT (48.0 ± 1.6%). BFS of both D-temp (164.2 ± 18.1 MPa) and N-temp (168.6 ± 8.9 MPa) were comparable but higher than that of UF (119.8 ± 13.6 MPa). ∆E of D-temp (2.7 ± 0.7) and N-temp (2.5 ± 0.8) were comparable but higher than that of other commercial materials (0.6-1.2).
The use of DMPT or NTGGMA showed negligible effect on monomer conversion, BFS, and color stability of the experimental provisional restorations. The conversion and BFS of the experimental materials were in the range of that obtained from commercial bis-acryl-based materials. However, the color stability of the experimental materials was lower than that of commercial materials.
评估不同胺类活化剂，包括N，N - 二甲基对甲苯胺（DMPT）或甲基丙烯酸缩水甘油酯钠 - N - 甲苯基甘氨酸（NTGGMA）对用于临时牙修复体的复合材料的化学活化单体转化率、双轴弯曲强度（BFS）和颜色稳定性的影响。
制备了两种含有DMPT（D - temp）或NTGGMA（N - temp）的复合材料配方。评估单体转化率。使用球 - 环测试夹具测试材料的BFS。还测定了材料在水中浸泡后的色差（∆E）。商业对照材料为Unifast（UF）、Protemp（PT）、Luxacrown和Luxatemp（LT）。
D - temp的单体转化率（57.4 ± 1.3%）与N - temp的单体转化率（59.0 ± 1.3%）相当。D - temp和N - temp的转化率均高于PT（48.1 ± 3.4%）和LT（48.0 ± 1.6%）。D - temp（164.2 ± 18.1 MPa）和N - temp（168.6 ± 8.9 MPa）的BFS相当，但高于UF（119.8 ± 13.6 MPa）。D - temp（2.7 ± 0.7）和N - temp（2.5 ± 0.8）的∆E相当，但高于其他商业材料（0.6 - 1.2）。
使用DMPT或NTGGMA对实验性临时修复体的单体转化率、BFS和颜色稳定性的影响可忽略不计。实验材料的转化率和BFS处于商业双丙烯酸基材料的范围内。然而，实验材料的颜色稳定性低于商业材料。
