Bond strength, enamel damage, properties of commercially available ceramics and novel composites and porcelain brackets
Ziadeh, Senan K.
MetadataShow full item record
The brackets used in orthodontics are expected to maintain their integrity. When ceramic orthodontic brackets were introduced in the middle 1980’s, they won instant acceptance from the profession and from patients. There are two types of commercially available ceramic brackets, both of which are made from aluminum oxide or alumina. The most common type, the polycrystalline alumina bracket, is translucent and may match tooth color to a certain extent. The monocrystalline alumina, or sapphire bracket, is transparent. Alumina and zirconia ceramic brackets are still not esthetic. Composite resins, porcelain and resin infused materials may be more esthetic and have sufficient properties to transmit and withstand orthodontic forces. The intent of this project is to fabricate orthodontic brackets from MARK II porcelain blocks MZ100 Composite blocks and to determine if the mechanical properties are comparable to those of conventional ceramic brackets. Multiple tests were performed on those fabricated brackets to compare them with the commercially available ceramic brackets. Those brackets were compared in means of debonding, fracture resistance to second order bends, and fracture resistance to third order bends. In the results of this study, the brackets fabricated from MARK II blocks and MZ1OO blocks showed comparable results to the commercially available ceramic brackets, with better esthetics. In conclusion, orthodontic brackets can be fabricated from Paradigm MZ1OO or MARK II porcelain blocks. They showed enough strength to withstand orthodontic forces. They proved to be strong enough to withstand the suggested magnitude of clinical arch wire torsional and tipping forces. They also showed less enamel damage when debonded which may be what orthodontists have been looking for.
PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact firstname.lastname@example.org.Thesis (DScD) --Boston University, Henry M. Goldman School of Dental Medicine, 2011 (Department of Orthodontics and Dentofacial Orthopedics)Includes bibliographic references: leaves 65-74.
RightsThis work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact email@example.com.