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.
|Commitee:||Finkelman, Matthew, Galburt, Roger, Hirayama, Hiroshi, Johnson, Marc, Kugel, Gerard|
|School:||Tufts University School of Dental Medicine|
|School Location:||United States -- Massachusetts|
|Source:||MAI 51/06M(E), Masters Abstracts International|
|Keywords:||Antagonist enamel, Dental ceramic, Opposing enamel, Wear|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be