Stress-strain response under spherical nanoindentation of tooth enamel

2015 Fiscal Year Final Research Report

• Project/Area Number: 25861808
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Conservative dentistry
• Research Institution: Showa University
• Principal Investigator: OGINO REINA (田中玲奈) 昭和大学, 歯学部, 助教 (80585779)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: エナメル質 / 物性 / 応力ひずみ曲線 / オフィスホワイトニング

Outline of Final Research Achievements

The aim of this study was to investigate the mechanical properties of bleached enamel and obtain stress-strain curves using spherical nanoindentation. Based on the hierarchical structure, nanoscale analysis is critical for the measurement of enamel crystals mechanical property. The stress-strain curves were obtained for the conical indenters for fused quartz and untreated enamel. The continuous stress-strain curves were measurable for untreated and in-office bleached (35 % hydrogen peroxide with halogen lamp irradiation 3 minutes x 3 times ; OB) enamel. The yield force was observed clearly in enamel stress-strain curves. The analysis of data obtained from partial unloading method with conical indenter tip revealed the stress-strain response by nanoindentation of enamel crystals without the effect of enamel sheath protein so that nanoscale mechanical properties on enamels with or without OB were comparable at material level.

Free Research Field

歯科理工学