Preparation and characterisation of resin-based dental composites using natural hydroxyapatite and silica fillers
Dental resin-based composites (RBCs) have been widely used in dental treatmentbecause of their excellent characteristics such as aesthetic, mechanical andbiocompatibility properties. The aims of this study were to prepare and characterise theresin-based dental composite using natural hydroxyapatite...
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| Format: | thesis |
| Language: | eng |
| Published: |
2021
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| Subjects: | |
| Online Access: | https://ir.upsi.edu.my/detailsg.php?det=6842 |
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| Summary: | Dental resin-based composites (RBCs) have been widely used in dental treatmentbecause of their excellent characteristics such as aesthetic, mechanical andbiocompatibility properties. The aims of this study were to prepare and characterise theresin-based dental composite using natural hydroxyapatite (NHA) and silica fillers. Theeffect of different compositions of these materials on the properties of dental resin composite was investigated. RBC was prepared by varying the composition of silica(0, 5, 15, 20 wt%) in the filler mixture of NHA and silica. The ratio between fillers and organicresins was fixed at 70:30 wt%. Two different ratios of organic resins of bisphenol A glycidylmethacrylate (BisGMA)/triethylene glycol dimethacrylate (TEGDMA)/hydroxyethyl methacrylate (HEMA) were used i.e. 50:25:25 wt% (CB50) and 25:50:25 wt% (CT50). The composites wereinserted into the mould and cross-linked using visible light for 60 seconds on bothsides. The degree of conversion, flexural and compressive strength, surface roughness, Vickershardness, water sorption of composites, and cytotoxicity test were evaluated andcompared. The surface morphology and distribution of the dental composites were also observed and examined by field emission scanning electron microscope (FESEM). Thedata were analysed using one-way ANOVA and the Tukeys post hoc test at the significance level of0.05. The results indicated that the CB50 with 15 wt% silica in filler mixture exhibitedsatisfactory mechanical and physical properties compared to CT50 with the value offlexural strength (42.74 MPa), compressive strength (174.28 MPa), surface roughness (43.0 nm),Vickers hardness (43.7 HV) and water sorption (34.84 g/mm). Cytotoxicity test demonstratedno toxic effects released from the composites. In conclusion, this result has compliedwith the standard requirement of dental composite. The implication, combination of NHA andsilica is promising as reinforcing filler for dental resin composite application. |
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