Calibration of a lactic-acid model for simulating biofilm-induced degradation of the dentin-composite interface

Autor: Laikuan Zhu, Mingyu Li, Yung Chung Chen, Yuping Li, Carola A. Carrera, Alex Fok
Rok vydání: 2017
Předmět:
Materials science
Surface Properties
Scanning electron microscope
Varnish
Composite number
02 engineering and technology
In Vitro Techniques
Composite Resins
Article
03 medical and health sciences
chemistry.chemical_compound
0302 clinical medicine
Materials Testing
Dentin
medicine
Animals
General Materials Science
Dental Restoration Failure
Lactic Acid
Composite material
Dental Restoration
Permanent
General Dentistry
Leakage (electronics)
Dental Leakage
Bone decalcification
Bond strength
X-Ray Microtomography
030206 dentistry
Hydrogen-Ion Concentration
Silicon Dioxide
021001 nanoscience & nanotechnology
Lactic acid
stomatognathic diseases
medicine.anatomical_structure
chemistry
Mechanics of Materials
Biofilms
visual_art
Calibration
Microscopy
Electron
Scanning
visual_art.visual_art_medium
Cattle
Zirconium
0210 nano-technology
Zdroj: Dental Materials. 33:1315-1323
ISSN: 0109-5641
DOI: 10.1016/j.dental.2017.08.186
Popis: To verify and calibrate a chemical model for simulating the degradation of the dentin-composite interface induced by multi-species oral biofilms in vitro.Dentin-composite disks (5-mm dia.×2-mm thick) were made from bovine incisor roots and filled with either Z100™ (Z100) or Filtek™ LS (LS) composite. The disks, which were covered with nail varnish, but with one of the dentin-composite margins exposed, were immersed in lactic acid solution at pH 4.5 for up to 48h. Diametral compression was performed to measure the reduction in bond strength of the dentin-composite disks following acid challenge. Scanning electron microscopy (SEM) was used to examine decalcification of dentin and fracture modes of the disks. To better understand the degradation process, micro-computed tomography, in combination with a radiopaque dye (AgNOAfter 48h of acid challenge, the debonding load of both the LS- and Z100-filled disks reduced significantly (p0.05). In the Z100-filled disks, debonding mostly occurred at the adhesive-dentin interface, while in the LS-filled disks, this happened at the adhesive-composite interface, instead. The degree of dentin demineralization, the reduction in debonding load and the modes of failure observed were very similar to those induced by multi-species oral biofilms found in the previous work. Leakage of AgNOThe chemical model with lactic acid used in this study can induce degradation to the dentin-composite interface similar to those produced by multi-species biofilms. With appropriate calibration, this could provide an effective in vitro method for ageing composite restorations in assessing their potential clinical performance.
Databáze: OpenAIRE
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