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The purpose of this study was to assess the effect of 1) the diameter(0.7,1.0,1.2㎜) and number(1,2,3) of commonly available orthodontic metal wires embedded in self-curing orthodontic acrylic resin specimens(64×10×3㎜) and 2) the use of chemical adhesive system(Silicoater,Metalprimer) to prevent slipping at the interface between the resin and the metal wire on reinforcement by using three-point bending test. From this study, the following results were obtained. 1. No statistically significant difference was found among the transverse strengths for the control without reinforcement, one 0.7㎜ wire, two 0.7㎜ wires, three 0.7㎜ wires, and one 1.0㎜ wire groups(P＞.05). 2. In the groups with 1.0 or 1.2㎜ wires, the transverse strength increased in proportion to toe increase of number of wirse(P＜.05). 3. In the groups with 0.7 or 1.0㎜ wires, neither of Silicoater and Metalprimer increased the transverse strength significantly(P＞.05). 4. No statistically significant difference was found in transverse strength between Silicoater groups and Metalprimer groups with same diameter of wires(P.＞05). From these result, it is concluded that diameter of wires is a primary considering factor to reinforce the acrylic resin effectively and, when this requirement is satisfied,increased number of wires or chemical adhesive systems can be expected to produce the additional reinforcing effect.
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