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正畸活动矫治器与局部义齿由于能增加牙菌斑形成,曾被认为是引起高发龋和龈炎的原因。临床试验用含0.2%的氟溶液漱口或用2%氟化钠溶液浸泡矫治器,菌斑减少。本实验是研究在丙烯酸树脂中加入氟化物对其机械性能的影响和氟的释放。准备几个65×10×2.5mm大的丙烯酸树脂基板,用公式S=1.5PL/T~2W计算出弯曲强度(S),P代表折断负荷,T和W分别代表标本的厚度和宽度,L为两个支点间的距离(50mm),标本受压弯曲的曲轴0.5mm。本实验用三种氟化物加入基板内,2.27%NaF,
Orthodontically active appliances and partial dentures have been considered responsible for the high incidence of caries and gingivitis as they increase plaque formation. Clinical trials with 0.2% fluoride solution mouthwash or 2% sodium fluoride solution soaked appliances, plaque reduction. This experiment is to study the effect of adding fluoride on the mechanical properties of acrylic resin and fluorine release. A number of large acrylic substrates of 65 × 10 × 2.5 mm were prepared and the flexural strength (S) was calculated using the formula S = 1.5 PL / T ~ 2 W, P represents the breaking load, T and W represent the thickness and width of the specimen, L For the distance between the two fulcrums (50mm), the specimen is bent 0.5mm crankshaft. The experiment with three fluoride added to the substrate, 2.27% NaF,