Dissertation/Thesis Abstract

The Effect of Different Dental Ceramic Systems on The Wear of Human Enamel: An in vitro Study
by El huni, Rabie M., M.S., Tufts University School of Dental Medicine, 2013, 46; 1537272
Abstract (Summary)

Purpose: The purpose of this study was evaluating the wear effect of advanced ceramic systems on the opposing tooth enamel.

Materials and Methods: Four ceramic systems (e.max Press, e.max CAD, Super Porcelain EX-3, LAVA Plus Zirconia) and one control group, containing natural enamel specimens, were evaluated in this study (n=12). Procedure was run in the form of two-body contact of bidirectional back-and-forth sliding movements in which a stylus runs against a flat surface with no lifting of stylus. Specimens were fabricated into the form of 11 mm diameter and 3 mm thickness disks according to the respective manufacturer’s instructions. Enamel disks were cut off the lingual surfaces of lower molar teeth. For enamel styluses, mesio-plalatal cusps of upper molar teeth, along with their roots, were cut and then embedded individually in 25 mm3 acrylic resin holders. A specifically designed cyclic loading machine was used for wear simulation. All enamel cusps were scanned three dimensionally using the SmartOptics Activity 880 Digital Scanner. Data of base line and follow/up scans were compared using the 3D digital inspection software Qualify (Geomagic) which aligned the models and detected the resultant geometrical changes that illustrate the wear results opposing each specimen. Data were analyzed using One Way Analysis of Variance and the software SPSS Statistics version 19.0 (SPSS).

Results: After 125,000 bi-directional loading cycles, control group showed the minimal mean of opposing enamel volume loss (37.08 µm 3), followed by the e.max Press system (39.75 µm3), the e.max CAD (40.58 µm3), the Noritake Porcelain system (45.08 µm3), and the Lava Plus Zirconia system (48.66 µm3). This study showed no significant difference in the amount of opposing enamel wear between the evaluated ceramic materials and the control enamel group (p-value 0.225).

Conclusion: Within the limitations of this study, there was no significant difference in the volume reduction of natural enamel cusps abraded against natural enamel surfaces and those abraded against evaluated ceramic materials. Furthermore, additional clinical and laboratory studies are needed in order to evaluate different ceramic systems, compare similar materials fabricated by different techniques, and also to standardize wear test parameters for better clinical correlation.

Index Words: Dental Ceramic, Opposing Enamel, Antagonist Enamel, Wear.

Indexing (document details)
Advisor: Zandparsa, Roya
Commitee: Finkelman, Matthew, Galburt, Roger, Hirayama, Hiroshi, Johnson, Marc, Kugel, Gerard
School: Tufts University School of Dental Medicine
Department: Other
School Location: United States -- Massachusetts
Source: MAI 51/06M(E), Masters Abstracts International
Subjects: Dentistry
Keywords: Antagonist enamel, Dental ceramic, Opposing enamel, Wear
Publication Number: 1537272
ISBN: 978-1-303-07928-3
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