Urapepon S, Kakuta K, Ogura H, Suchatlampong C, Rittapai A
Prosthodontics Department, Faculty of Dentistry, Mahidol University, 6, Yothi Road, Rachathevi, Bangkok, 10400, Thailand.
Dent Mater J. 2000 Jun;19(2):186-95. doi: 10.4012/dmj.19.186.
Powder-liquid type metal-resin composites, using Ag-Sn irregular particles as the filler, 4-META as coupling agent and UDMA + TEGDMA as resin matrix, were experimentally prepared under 9 different conditions (three different particle sizes and three different filler contents). The flexural strength and flexural modulus were measured. Three different irregular particle size MRCs without redox-initiator at 94% filler content, as well as amalgam, conventional hybrid composite and Ag-Sn spherical particle MRC were evaluated for condensability. The flexural strength of the Ag-Sn irregular particle MRC was significantly influenced by both the filler particle size and filler contents (p < 0.01). It increased when either the filler content increased or the particles size decreased. The highest flexural strength (97.6 MPa) was obtained from the condition of particles size < 20 microns and 94% filler content. The flexural modulus was significantly influenced by filler content and it increased with increasing filler content. The condensability of the Ag-Sn irregular particle MRC was lower than that of amalgam but much higher than presently available conventional composites and spherical particle MRC.
以Ag-Sn不规则颗粒为填料、4-META为偶联剂、UDMA + TEGDMA为树脂基体，在9种不同条件（三种不同粒径和三种不同填料含量）下通过实验制备了粉液型金属树脂复合材料。测量了其弯曲强度和弯曲模量。对94%填料含量下三种不同粒径且无氧化还原引发剂的不规则颗粒MRC，以及汞合金、传统混合复合材料和Ag-Sn球形颗粒MRC进行了凝聚性评估。Ag-Sn不规则颗粒MRC的弯曲强度受填料粒径和填料含量的显著影响（p < 0.01）。当填料含量增加或粒径减小时，弯曲强度增加。在粒径<20微米且填料含量为94%的条件下获得了最高弯曲强度（97.6 MPa）。弯曲模量受填料含量的显著影响，且随填料含量的增加而增加。Ag-Sn不规则颗粒MRC的凝聚性低于汞合金，但远高于目前可用的传统复合材料和球形颗粒MRC。
