Abstract：
OBJECTIVES:Failure of the enamel adjacent to the defects in teeth with molar incisor hypomineralization (MIH) limits the success rate of the restorations placed in these teeth and this frequently leads to their ultimate extraction. To understand the cause, a state-of-the-art combination of focused ion beam (FIB) and nanoindentation techniques was used to evaluate the fracture properties and microstructure of enamel from specific regions of two MIH teeth. METHODS:Nanoindentation, bend tests on micro-cantilevers and transmission electron microscopy (TEM) were employed to compare the microstructure and mechanical properties of the unaffected, opaque and transitional region in two MIH teeth. Special attention was paid to the transitional region in all the experiments in an attempt to identify its role in affecting the overall integrity of the MIH teeth. RESULTS:The enamel in the transitional region, despite its translucent appearance under the naked eye, was found, under TEM, to have prism sheaths that were significantly less mineralized than unaffected enamel and were proved to be weaker in holding the prisms together when measured using bend tests on micro-cantilever samples machined from the region. CONCLUSION:The enamel in the transitional region adjacent to the demarcated defects in MIH has notable alterations in their prism sheaths which likely contribute to their lowered mechanical properties.
journal_name
J Dentjournal_title
Journal of dentistryauthors
Chan YL,Ngan AH,King NMdoi
10.1016/j.jdent.2009.11.003subject
Has Abstractpub_date
2010-03-01 00:00:00pages
237-44issue
3eissn
0300-5712issn
1879-176Xpii
S0300-5712(09)00256-5journal_volume
38pub_type
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