IAU Researcher Presents Method & System for Treatment of Maxillary Deficiency Using Miniscrews

Sunday, January 21, 2018 - 11:13

Researchers from Islamic Azad University have presented a method and system for treatment of maxillary deficiency using miniscrews including placement of self-drilling Titanium alloy miniscrews in the lower jaw, and Class III elastic tractions connecting the miniscrews to a tightly fitting upper removable appliance.

According to an ISCA report, Abdolreza Jamilian, orthodontist and a prestigious USPTO patent holder, developed a method which intensifies correction of maxillary deficiency and increases convenience of the device usage.

The invention relates to orthopedic correction of maxillary deficiency. Skeletal Class III malocclusion is one of the most difficult discrepancies to correct. It can be defined as skeletal facial deformities characterized by maxillary deficiency, mandibular protrusion, or a combination of both.

In subjects with maxillary deficiency where the mandible is not markedly affected, treatment may involve stimulation and guidance of maxillary growth by orthopaedic forces. Various types of extraoral appliances such as facemasks (U.S. Pat. No. 4,988,291 and D308, 096) and protraction headgears (U.S. Pat. No. 7,121,824) have been used to correct maxillary deficiency.

Such extraoral appliances are particularly unpleasant to wear. In order to overcome this disadvantage De Clerck invented an orthodontic implant (U.S. Pat. No. 7,329,121) which makes it possible to gradually move a person's maxilla to forward position by exerting an almost continuous pressure force or tensile force on the teeth.

According to that invention the use of extra oral appliances is no longer necessary. However, the placing of the implant according to the invention on the lower or upper jaw requires a small surgical incision.

To eliminate the problems associated with previously used extraoral appliances and to avoid the small surgery needed for placement of miniplates, the researcher has developed a new method which he placed miniscrews in the lower jaw and an upper removable appliance in the upper jaw.

He used Class III elastics to connect miniscrews to the upper removable. With this method there would be no need for any surgery and the small size would be very favorable for the patients.

Detailed Description Of The Invention

Self-drilling Titanium Alloy Jeil™ miniscrews 1 (Jeil Medical Corp., Seoul, Korea) with 1.6 mm diameter and 8 mm length were placed under local anesthesia into the buccal alveolar bone between the mandibular canine and first premolar roots on both sides. The ideal position for screw insertion was evaluated by using a panoramic radiograph in order to avoid damage to the roots of the adjacent teeth and mental foramen. A tightly fitting upper removable appliance 2 was fabricated with hooked orthodontic clasps 3 on the upper first permanent molars and premolars and orthodontic clasps 4 on the upper permanent. An expansion screw 5 was placed in the midpalatal area of the upper removable appliance in order to loosen the nasomaxillary sutures for better movement of the maxilla. Miniscrews 1 were connected to the hooks of the clasps 3 of the removable appliance 2 by medium size orthodontic latex elastics 6 in order to generate ˜350 g of anterior retraction.

In this method, the researcher places self-drilling Titanium alloy miniscrews 1 with 50 to 70 degrees of angle in order to avoid loosening of the miniscrews. The angles chosen can achieve the best stability of miniscrews in the bone (Am. J. Orthod. Dentofac. Orthop. 139:628, 2011).


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