Transversal Expansion and Self-Ligating Brackets: A CBCT Study
Paolo Cattaneo, L. Cevidanes, M. Treccani, A. Myrda, B. Melsen
Aarhus, Denmark
Aim: To perform 3D assessment of the transverse changes of the maxillary alveolar bone on patients treated with active and passive self-ligating brackets. Material and Methods: Pre- and post-treatment CBCT-scans of 50 patients were taken. 3D models were generated from the scans, were registered using the cranial base stable structures, and superimposed. Changes in basal alveolar bone and dental arches were evaluated using a 3D colored mapping. Results: Expansion happened mostly in the canine and more in the premolar region, and was achieved by buccal tipping. No transverse augmentation of basal bone could be detected. High variation and strong patient-related patterns of transversal expansion were observed.
There has been a lot of media buzz about Damon braces with claims that extractions are not required, and that bone is generated due to extremely light forces. There are also unsubstantiated claims about moving teeth faster. Most people don't want teeth taken out and want fast treatment. With ads showing Miss Seventeen wearing them, who wouldn't want a Damon orthodontist?

At Markham Centre Orthodontics, we strive to provide evidence-based treatment for your Unionville braces and Markham orthodontics. Despite the hype and buzz about this "revolutionary" technology, we want to be sure we are providing our patients with the best and healthy options possible. It is important to realise that it is the orthodontist, treatment planning, and diagnosis, that produce successful outcomes, not a particular product, be it Damon, Invisalign, or any other type of appliance.
A study has come out of the University of Oklahoma by Paventy to scientifically refute the claims by Damon users. They used cone beam technology, similar to that of CAT scans, to measure bone around the teeth after trying to correct severe crowding that Damon braces claim to be able to correct without extractions.
Here is the abstract:
Nonextraction Treatment Using the Damon System: A CBCT Evaluation
Anthony M. Paventy
University of Oklahoma
Objective: To evaluate facial bone changes using CBCT after arch development using the Damon System in nonextraction treatment of moderate to severe crowding.
Methods: 19 patients with clinical crowding of 5+ mm were treated following the Damon System. ACBCT scan was taken prior to bonding (T1) and again after arch development (T2). T1 data served as the internal control group.
Results: The maxillary 1st premolars, mandibular 1st and 2nd premolars and mandibular molars all showed significant facial bone height loss. Additionally, every maxillary tooth showed significant mean facial bone width loss. The same was true for the mandible
Conclusion: The Damon System effectively expanded both dental arches. However, facial bone did not correspondingly adapt after arch development was completed. In fact, facial bone decreased significantly in height and width for nearly all teeth measured.
What this means is that while teeth can be straightened when there is inadequate space, the supporting structures around the teeth can be weakened, leading to an increased likelihood of future gum and tooth mobility problems. The data is beginning to show that severe crowding and transverse expansion may not be best treated without extractions, expanders, or surgery, regardless of what appliance is being used.
Note that the use of self-ligation with proper treatment planning has produced many successful results. However, studies unequivocally show that they are no faster than traditional brackets, and that some brands may actually be more uncomfortable. The data presented at the AAO in Boston and AAO/AAP joint meeting in Orlando confirm that there may be no advantage of self-ligation over traditional brackets.
Orthodontics should be directed at creating healthy smiles that last a lifetime. There are times that it is healthier to remove teeth than to try and fight the natural balance of our bodies. Seek your own professional opinion regarding your own personal situation. Please call 905-477-7750 to schedule your complimentary evaluation for Richmond Hill braces, Scarborough Invisalign, and Markham orthodontics.











