Rapid Maxillary Expansion (RPE) is a cornerstone of orthodontic treatment, established for decades as a useful adjunct. Since the introduction of CBCT, many reports have shown that tooth-borne RPE has the undesired effects, such as loss of buccal bone after the expansion, and significant buccal flaring of the dentition. Bone-borne RPE has been reported, with mixed results; the amount of skeletal expansion and the tipping effects are controversial between bone-borne and tooth-borne RPE. Among these, Mini-Implant Assisted Maxillary Skeletal Expander (MSE), known as a tooth bone borne type hybrid expander, has several advantages. Guide holes in the expander provide beginners the solution on where to place the mini-screws. It is commercialized and easy to obtain ready-made products. And also, the treatment results are fairly consistent. These merits allowed the popularity of the appliance all over the world. Many clinicians favor the MSE because it can overcome the disadvantages; so therefore, there are explosion of clinical studies on this appliance. But, could this hybrid expander empower "Targeted transverse correction in accordance with different type of maxillary deficiency?"
The speaker compared and analyzed different maxillary expansion appliances on the biomechanical expansion effect, the effect on periodontal tissue, and the relationship between alveolar bone bending and suture opening. Through this presentation, the speaker wants to compare treatment effects and periodontal changes among conventional hyrax expander, Tooth-bone borne type hybrid expander (Miniscrews assisted expander, MSE) Tissue bone borne type expander (Biocreative-Expander, C-Expander), Tissue-tooth borne slow expander (Horseshoe Expander), and True bone borne type expander (ATOZ expander) with finite element analysis, cone beam CT study and clinical case reports. Through this presentation, the speaker also suggest new transverse discrepancy index, center of resistance of teeth arch form (CR-arch form) as a great alternative to Y-transverse index.
Audience members will learn specific clinical tactics and overall treatment protocols using targeted maxillary expansion appliance that will broaden their scope of treatment options like Noah’s Ark in the current orthodontic appliance flood.
Learning Objectives:
After this lecture, attendees will be able to:
Recognize the actual transverse discrepancy condition of patient and decide whether to expand maxilla or not (CR-Ratio/Area Ratio/YTI).
Define the characteristics of tooth bone borne hybrid expander (MSE) and Tissue bone borne type Biocreative Expander (C-Expander) and compare their actual treatment effect.
Define the characteristics of tissue-tooth bone borne slow expander (HSE) and true bone borne ATOZ expander and evaluate their actual treatment effect.
