• : Full-contour

• Human tooth enamel

• IPS e.max CAD

• Ceramco III body porcelain

Objectives:

The purpose of this comparative test is to quantitatively identify the degree of wear of human tooth enamel opposing different restorative materials. Specifically, this test was conducted to evaluate clinical validity of full contour zirconia (full-coverage crown) by comparing zirconia’s wear capacity over antagonistic teeth with that of feldspathic dental porcelain and e.max.

Preparation of the Specimens

Lower Side-Human Tooth

Actual human teeth were first fixed in the dental model stone and then embedded in an acrylic resin mould with only the buccal cusp exposed

Upper Side

Case 3: IPS e.max CAD (according to Instructions for Use Manual)

Case 4: Ceramco III Body Porcelain (according to Instructions for Use Manual)

Test Subjects Prepared for Wear Test

Wear Test

X 1,250,000 = 5 years of simulated chewing

SEM Pictures, 3D Image & Surface Scan

1. Upper side – Surface Condition for Opposing Restorative material specimen

Nova nanoSEM 600, Dept of Physics & Applied Science, Univ. of Utah

2. Lower side – Enamel Wear (Volume & Height)

Origin Intelligence, 3D Dental Scanner, Accuracy 10 micron, Camera resolution 1.4 mega pixels

Image Comparison

3D surfaces were scanned, before and after the wear test, using the ORIGIN Intelligence™ 3D Scanner. Image Comparisons were created with CAD/CAM Inspection Software to calculate the wear loss.

Wear Results

1. Lower side – Enamel Wear (Loss)