PROPERTIES OF METHACRYL POLYHEDRAL OLIGOMERIC SILSESQUIOXANE (POSS-MA) DOPED METHACRYLATE-BASED DENTAL RESINS AND COMPOSITES CONTAINING GLASS FLAKE/Ba-Al-SiO2 GLASS POWDER AS INORGANIC DENTAL FILLERS

DAN FENG¹, XIAOWEI GUO¹, XUE JIANG1, XIAOMENG ZHANG¹, JIAHUI ZHANG¹, ZUOSEN SHI², ZHANCHEN CUI², SONG ZHU¹

¹Department of Prosthodontics, School and Hospital of Stomatology, Jilin University, People’s Republic of China ²State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, People’s Republic of China

Introduction: Aging resistance appears to be an important parameter in the development of dental composite resins. To improve the clinical performance and longevity of dental resin composite, a new kind of composite reinforced by glass flakes was fab- ricated and its properties were investigated.

Materials and methods: Camphorquinone and ethyl 4-dimethylaminobenzoate as initiators, a methacrylate-based Bis-GMA (2,2-bis [4- (2 - hydroxymethacryloxypropoxy) phenyl] propane) /TEGDMA (triethyleneglycol dimethacrylate)/POSS-MA0735 mix- ture was selected as the dental matrix, and different mass fractions of silanized glass flakes/Ba-Al-SiO2 nano-glass powders (65/0, 64/1, 61/4, 58/7, 55/10, 50/15 wt %) were incorporated to produce the experimental filled composite resin. Properties including elas- tic modulus, flexural strength, water sorption and solution were tested.

Results: The flexural strength of neat resin with 5 wt% POSS-MA0735 was higher than the Bis-GMA/TEGDMA mixture. When POSS-MA was raised to 10 wt%, the degree of conversion decreased significantly. The composite material with 58/7wt% glass flakes / Ba-Al-SiO2 provided excellent mechanical behaviors, with the highest flexural strength up to 134 MPa. With the decrease of glass flakes , the water sorption and solution increased significantly.

Conclusions: POSS-MA0735 can improve the flexible strength of dental composite resin. The combination of fillers with irreg- ular Ba-Al-SiO2 powders can increase the mechanical properties of dental composite resin. The composite material with 58/7wt% glass flakes / Ba-Al-SiO2 owns a good comprehensive performance with lower water sorption and solubility.