I think it's safe to say that few orthodontic innovations since the advent of preprogrammed, "straightwire" brackets have had as much impact on the specialty as Invisalign has. Right from the outset, it seemed that there were two opposing camps within orthodontics regarding the future of clear aligners. On one side, there were those who wanted no part of a product they saw as threatening to their livelihood. On the other, there were many who were enthusiastic about the potential of so-called "braceless orthodontics". The ability to move teeth without visible fixed appliances has always had tremendous patient appeal. Indeed, this very appeal had led to the development of lingual braces, removable appliances such as Crozats and positioners, and various sorts of vacuum-formed "aligners". Two decades ago, we were already witnessing a substantial increase in the demand for adult orthodontics. That demand virtually exploded with the advent of Invisalign.
San Diego may be more renowned for its coastal climate and resorts than its metropolitan attractions, but it's the second largest city in California and the eighth largest in the United States. The AAO annual session returns April 21-25 for its first visit since 1999.
Upper canines have the longest and most complicated period of tooth development. Because they begin mineralization before the first molars and incisors and take twice as long to completely erupt, they are more susceptible to changes in the normal eruption pathway, leading to the common clinical problem of impaction. The prevalence of impacted upper permanent canines is approximately 1-3% -- more than for any other teeth except the third molars. Palatal impaction is two to three times more common than buccal impaction.
About half of all Class II malocclusions are asymmetrical. If the upper molar is mesially displaced, the maxillary midline will deviate toward the Class I side, and treatment will require either extraction of one upper premolar or distal molar movement on the Class II side. In 61% of asymmetrical Class II cases, however, where the lower molar is distally displaced, the maxillary midline will match the medium sagittal plane, but the mandibular midline will deviate toward the Class II side. If the profile is convex, asymmetrical extractions (two upper premolars and one lower premolar on the Class I side) are generally used for correction. Another option is to extract four premolars, but this will extend treatment time.
DR. KEIM To start off, Joe, is there anything you would particularly like to bring to the attention of JCO readers? MR. HOGAN I'd just like them to understand our position regarding the support that we have for orthodontists, and how we believe in the community. I believe there has been a lot of controversy in the past in the sense of our support of GPs vs. our support of orthodontists. I don't want your readers to have any kind of concern regarding how we view the orthodontic community. Our commitment to it is really important. Secondly, they're probably uncomfortable with me. They knew the former CEO of Align Technology, Tom Prescott, for several years. I think without being exposed to someone for very long, you fill your own vacuum in a sense of who this guy is, and I want them to be comfortable with me. I carry on Tom's legacy, and I see the company in a lot of the ways that Tom did.
The etiology of anterior open bite is generally multifactorial, involving a combination of skeletal, dental, and functional effects. Potential causes have been listed as unfavorable growth patterns, digit-sucking habits, enlarged lymphatic tissue, heredity, and oral functional matrices. The most common characteristics of anterior open bite are incisor protrusion and overeruption, but other features may include excessive gonial, mandibular, and occlusal plane angles; a short mandibular body and ramus; excessive lower anterior facial height; reduced lower posterior facial height and upper anterior facial height; a retrusive mandible; a Class II tendency; divergent cephalometric planes; a steep anterior cranial base; and inadequate lip seal. Some studies have found a correlation between a weak orofacial musculature and a long face and consequent anterior open bite.
Reopening of anterior spaces following orthodontic treatment is particularly frustrating for both patient and orthodontist. In this Pearl, the authors show an esthetic, noncompliance-dependent method ...
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