The study of orthodontic biomechanics is a lost art. The scientific understanding of tooth movement has largely been replaced by commercial orthodontics based on simple wire sequencing and "magic" brackets. I think that if the recently departed Dr. Charles Burstone were still here, he would say that our profession has become a little lazy and forgotten the fundamental principles of mechanotherapy. Have we stopped asking ourselves, "What are my treatment objectives, and what specific steps will I take to get there?" or "How could this undesirable side effect be avoided?"
Few individuals have contributed as much as the late Dr. Charles Burstone to the development of orthodontic biomechanics as a scientific discipline. To say that Dr. Burstone, who passed away in February at age 86, was a prolific writer would be a gross understatement. He published more than 250 journal articles, including many here in JCO, where he was an Associate Editor from 1979 to 2003. He was legendary around the world for his unequaled knowledge of the art and science of orthodontics. Although he has been eulogized frequently during the past year (see The Editor's Corner, March 2015), more reasons to celebrate his many accomplishments continue to surface.
I wrote two articles for JCO about the Herbst* appliance, one published in 1981 and one in 1982.1,2 I retired from orthodontics in 2008, but I thought your readers might enjoy a little humor regarding...
In this series of articles, we present the most important results of the 18th biennial JCO Orthodontic Practice Study. Part 1 analyzes trends in U.S. orthodontic economics and practice administration since the first survey was conducted in 1981, focusing on changes since the 2013 Study. In subsequent issues, we will examine data related to practice success and practice growth. JCO subscribers can access the complete tables; the survey questionnaire appears at the end of this document. All previous Practice Study articles and tables are also available in the archive.
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The authors of this month's Cutting Edge column have taken on a question that I pondered several years ago: How accurate is a two-dimensional facial photograph that has been stretched" over a three-dimensional cone-beam computed tomography (CBCT) volume using Anatomage software? Although my query was born of simple academic curiosity, it is now a practical matter, as more orthodontists and orthognathic surgeons are becoming reliant on 3D analysis to diagnose and treat complex facial asymmetries.
Loss of a tooth in either arch will result in tipping of the adjacent teeth toward the extraction space, narrowing of the alveolar ridge due to resorption, and supraeruption of the antagonist tooth. T...
Building a solid foundation for high-quality practice management requires formalized systems, protocols, and checklists. To cite two well-known examples, McDonald's and Starbucks have built business empires out of standardized protocols for consistently delivering the same customer experience, no matter where the customers enter their locations. In this month's article, Drs. Daniel German, Michelle Furlong, and Terry Gruelle present a straightforward procedure for making chart entries that will standardize your assistant tasks and streamline doctor time when first sitting down to see clear-aligner patients. I have already started implementing this system in my office and am pleased with its simplicity.
The permanent teeth most likely to become impacted are the upper and lower third molars and the upper canines, followed by the lower premolars. Impaction of lower first permanent molars is rare, with an estimated prevalence of .01%. Treatment options include extraction, with or without osseointegrated implant placement, dental luxation, or orthodontic loading; orthodontic treatment with intra- or extraoral devices; and orthodontic extrusion with screws or plates as temporary skeletal anchorage. Because normal eruption of the lower first and second molars is essential for development and coordination of the dental arches and the facial skeleton, a conservative treatment plan aimed at proper positioning of these teeth in the mandibular arch should be considered whenever possible.
Short-root anomaly is an idiopathic condition that can occasionally be associated with an autosomal dominant pattern of inheritance. It affects about 1.3% of the population and is more prevalent in women. Caused by incomplete root development rather than resorptive processes, it is usually confined to the upper incisors or premolars, but may sometimes affect the entire dentition, when it is known as generalized short-root anomaly. Short-root anomalies may be associated with systemic conditions such as dysplasia type 1, scleroderma, thalassemia, Stevens-Johnson syndrome, Aarskog syndrome, Down syndrome, or Rothmund-Thomson syndrome.
Click here to download a PDF of the printed questions from the journal for reference. CE tests must be taken online. See the link to continuing education on the menu bar at the top of the screen.
Click here to download a PDF of the Product News column for October 2015. See also the Online Product News page of our website for a searchable data base of published Product News items for the past s...
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