Aggenbach, R. (Rob) (2014) Fractuursterkte van glascarbomeer in vergelijking met composiet in klasse I en II restauraties: een in vitro studie. thesis, Dentistry.
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Abstract
Introduction Recent research on the estrogenicity of bisphenol-A (BPA), and other aromatic components obtained from bis-GMA (bisphenol A glycidyl methacrylate)-based composites resulted in concern on the bio-compatibility, toxicity and safety of composite as a restorative material. Despite the recent negative publicity composite remains the first choice in restoration materials for the restoration of class I, II , III , IV and V restorations. This is due to its superior properties in terms of strength, finishing, handling and aesthetics. By contrast another restorative material, glass carbomer, is a on glass ionomercement based material with the integration of nanoparticles. Due to the incorporation of these nanoparticles, glass carbomer has a higher filling degree. This would increase the reactive surface and thus a better curing reaction would take place, resulting in a stronger restoration. The main objective of this study is to compare the in vitro fracture strength of glass carbomer (GCP-fill) with composite (Filtek Supreme XTE) in class I and class II (MOD) restorations in a human mandibular third molar. Materials en Methods 80 human mandibular third molars without caries, endodontic treatment, fractures or restorations were randomly divided in 8 groups and numbered 1/80: Group 1: class I GCP, Group 2: class I Filtek Supreme XTE, Group 3: class I GCP + thermocycling, Group 4: class I Filtek Supreme XTE + thermocycling, Group 5: class II GCP, Group 6: class II Filtek Supreme XTE, Group 7: class II GCP + thermocycling, Group 8: class II Filtek Supreme XTE + thermocycling. Half of the testgroup (N=40) are thermally aged by means of thermocycling(10,000 cycles, 5 ° C to 55 ° C). The other half is retained for this period, in water at room temperature. All groups were mechanically tested by placing a load cell (1mm/min) on the occlusal plane. The maximum fracture strength of the examined elements are analyzed by means of an independent t-test (P <0.05). Results The mean fracture strengh (N) for each group (mean ± SD): Group 1 (1931 ± 757), Group 2 (3248 ± 1260), group 3 (706 ± 393), Group 4 (± 1835 N 1136), Group 5 (1193 ± 512), Group 6 (1653 ± 853), Group 7 (1309 ± 545) and Group 8 (1959 ± 583). The analysis shows a significant difference in fracture strength between groups 1 and 2 (p = 0.004), group 3 and 4 (p = 0.014) and 7 and 8 (p = 0.027). The analysis shows that there is no significant difference between group 5 and 6 (p = 0.177). Conclusion Filtek Supreme XTE is significantly stronger as a restorative material in class I preparation. There is no significant difference in fracture strength between the two filler materials in a class II restoration without thermocycling. There is a significant difference in fracture strength between the two filling materials in a class II restoration with thermocycling, with Filtek Supreme XTE having a significantly higher fracture strength.
| Item Type: | Thesis (Thesis) |
|---|---|
| Supervisor name: | Gresnigt, dr. M.M.M. and Stel, dr. G. |
| Faculty: | Medical Sciences |
| Date Deposited: | 25 Jun 2020 10:54 |
| Last Modified: | 25 Jun 2020 10:54 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/1507 |
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