新型美容牙科纤维／树脂复合材料桩钉的研制

目的 :研究高强玻璃纤维增强丙烯酸类树脂的力学性能 ;探索复合材料桩钉的成型方法。　方法 :用缠绕法制作预浸料 (S- GF/EAM树脂 ) ,用层压法制成单向纤维 /树脂复合材料 ,并测试其弯曲强度、弯曲模量和层间剪切强度。取适量的预浸料放入自制的模具中按复合材料成型工艺压制桩钉 ,并测试其纤维含量。　结果 :随着纤维含量增加 ,复合材料的弯曲强度和弯曲模量呈显著性增加 (P<0 .0 1) (弯曲强度 :1414.7± 6 4.5 Mpa,弯曲模量 :39.6± 1.6 Gpa) ,用模具压制的桩钉纤维含量为 (6 8.38± 1.6 7% )。　结论 :高强度玻璃纤维对丙烯酸树脂的弯曲性能具有增强作用。高强玻璃纤维 /EAM树脂复合材料桩钉可以满足临床需要。

DEVELOPMENT OF NEW-GENERATION DENTAL NONMETAL POSTS BY GLASS FIBER REINFORCED ACRYLIC RESIN

Objective: To study the mechanical property of acrylic-based resin reinforced by high-strength glass fibers; To explore the proper method of producing composite resin post and core.　　Methods: 48.7%, 56.8%, 72.4% (w/w) of Sglass fibers were added into acrylic-based resin respectively to prepare fiber-reinforced composite resin (FRC) in a unilateral form. The transverse strength, shear strength and fracture load of the materials were measured. Pre-impregnated material is pressed into dental post in the self-made mould and fiber volume is measured.　　Results: The fracture load and Young's moduls of the FRC were increased with the increase of S-glass fiber volume (P＜0. 01).　The highest fracture load and Young's modulus values were obtained in the FRC with 72.4% S-glass fibers and were (1414.7+64. 5) Mpa and (39. 6±1.6 ) Gpa respectively; The fiber volume of post is (68.38±1.67) %.　 Conclusion: The flexure property of acrylic-based resin can be reinforced by the incorporation of S-glass fibers. The post made by high-strengthen glass fiber reinforced dental acrylic resin could be used in clinic successfully.