Comparison of color stability and mechanical properties of esthetic brackets made of indirect composite, porcelain, and alumina with CADCAM machine
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Abstract
With the awareness of dentistry and ever-increasing desire for esthetic appliances in orthodontics for the patient and dental community, tooth-colored brackets were introduced. When ceramic brackets were introduced in the middle 1980’s, they won instant acceptance from the profession and the patients. There are two types of commercially available ceramic brackets both of which are made from aluminum oxide (alumina). The most common type, the polycrystalline alumina bracket, is translucent and may match tooth color to a certain extent. Monocrystalline alumina (sapphire) brackets are transparent but they are still not very esthetic. Composite resins and porcelain may be more esthetic and have sufficient properties to transmit and withstand orthodontic forces.
The purpose of this study was to fabricate orthodontic brackets using indirect composite MZ100 and MARK II porcelain blocks and to determine if the mechanical properties are comparable to those of conventional Fascination alumina brackets in dry and wet condition.
Multiple tests were performed with these brackets to compare them with commercially available alumina brackets. The brackets were compared in for fracture resistance to second order bends, fracture resistance to third order bends, and color stability when exposed to solutions of coffee and turmeric. The results of this study showed that brackets fabricated with MZ100 and MARK II were mechanically comparable to commercially available alumina brackets, and exhibited better esthetics.
In conclusion, orthodontic brackets can be fabricated from Paradigm composite MZ100 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. Only the Paradigm MZ100 material showed visible discoloration when exposed to turmeric solution.
Description
Thesis/Dissertation (DScD) --Boston University, Henry M. Goldman School of Dental Medicine, 2014 (Department of Orthodontics and Dentofacial Orthopedics).
Includes bibliographic references: leaves 81-90.
Includes bibliographic references: leaves 81-90.
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This work is being made available in OpenBU by permission of its author, and is available for research purposes only. All rights are reserved to the author.