含氟复合树脂释氟对材料挠曲强度的影响

目的：研究含氟复合树脂释氟对材料本身机械性能的影响。方法：选择不同氟含量的含氟树脂，以氟电极法连续30d测定含氟复合树脂体外释氟量。万能试验机测定含氟复合树脂释氟30d前后的挠曲强度。结果：含氟树脂氟含量越高（重量比分别为0％、0．3％、0．6％和1．2％），初期释氟量越大（分别为0、21．98、43．98和99．91μg.cm^-2)，相应挠曲强度越低（分别为101．70、94．29、82．03和79．84MPa）。随着含氟复合树脂释氟量的增加，材料的挠曲强度相应降低。结论：含氟树脂释氟对其机械性能有一定影响。

Effect of fluoride release on fiexural strength of fluoride-containing composites

OBJECTIVE: To study fluoride release and its impact on flexural strength of fluoride-containing composites. METHODS: Experimental composite resins containing 0.3%, 0.6% and 1.2% fluoride (w/w) respectively and non-fluoride control composites were selected, including a compomer and its control composites. The amount of fluoride release in vitro was determined with fluoride ion-sensitive electrode in a 30 day consecutive period. The flexural strength was measured by Autograph Machine before and after releasing fluoride in water. RESULTS: The amount of fluoride release increased (0, 21.98, 43.98 and 99.91 micrograms.cm-2 respectively) and the flexural strength decreased (101.70, 94.29, 82.03 and 79.84 MPa respectively) while fluoride-contents in resins increased (0%, 0.3%, 0.6% and 1.2% respectively). With fluoride release, the flexural strength decreased significantly (P < 0.05). CONCLUSION: Fluoride release affects mechanical properties of fluoride-containing composites.