Date of Award
Spring 1993
Document Type
Thesis - Restricted
Degree Name
Master of Science (MS)
Department
Dentistry
First Advisor
Dhuru, Virendra B.
Second Advisor
Ferguson, Donald J.
Third Advisor
Pincsak, John J.
Abstract
Ceramic brackets were introduced in response to a demand for aesthetic orthodontic appliances. Although ceramic brackets may possess superior aesthetic characteristics, they do have some unfavorable characteristics. Ceramic brackets are made from aluminum oxide or alumina, which is brittle and has little plastic deformation. As a result of orthodontic forces involving torquing or tipping, the incisal or gingival wings of the brackets may be forced apart which may cause fracture. Since bracket fracture may lead to increased treatment time or injury to the patient, a logical question to be explored would be: ''ls there a difference in fracture characteristics among commercially available ceramic brackets?" This experiment was designed to evaluate the fracture resistance of commercially available ceramic brackets. Five commercially available ceramic bracket types (Starfire TMB, Allure, Ceramaflex, Lumina, Transcend 6000) with 0.022 inch slots, Roth prescription were tested. Thirty brackets of each type were bonded to porcelain discs mounted in acrylic blocks. A 0.0215 by 0.028 inch stainless steel wire was passively inserted into the brackets and torqued to simulate upper incisor lingual root torque. The torsional moment prior to fracture was recorded, as well as the angle prior to fracture. The fracture site was recorded and categorized into six types...
Recommended Citation
McReath, Timothy J., "Fracture Strength of Ceramic Brackets During Buccal-Lingual Archwire Torsion" (1993). Master's Theses (1922-2009) Access restricted to Marquette Campus. 5310.
https://epublications.marquette.edu/theses/5310