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An Introduction to Topography and Applications of “Seifi Functional Appliance”

Massoud Seifi
Professor, Dept. of Orthodontics, Dental School, Shahid Beheshti University of Medical Sciences

Topography of Innovated Seifi Functional (An appliance for mandibular protruding and deep bite correction, Invention Registration Number: 28434 Date: March 10, 2003): These functional appliances consisted of the maxillary and mandibular removable appliances. The mandibular appliance consisted of incisor clasp on mandibular incisors for retention, an acrylic cap, covering incisors and an extension of a lingual flange to mandibular first molars with no retentive element on posterior teeth to let them erupt independently. The height of the acrylic cap is determined by thickness of construction bite and was limited to the incisal edge of the maxillary incisors. The maxillary appliance consisted of a modified Hawley appliance with the retentive parts on posterior teeth, mid palatal screw, an acrylic vertical plate which fitted back to the guiding plate of lower acrylic cap and a double labial bow is used in cases of maxillary incisors proclination.
Mechanism of the Action for Seifi Functional: Clinical application of the appliance leads to a protrusive position of the mandible and when neuromuscular adaptation takes place, a concomitant bone remodeling will ensue (Sagittal correction). Palatal expansion will unlock the mandible from the maxillary constriction especially in intercanine area (Transverse correction).  The thickness of the capping anterior acrylic opens the bite and lack of any retentive element on the lower posterior teeth causes a complete expression of their potential eruptive capacity (Vertical correction). The retracting force of mandibular retracting muscles and suprahyoid muscles are transferred to the capping part of the lower appliance and from it to the vertical plate of the maxillary appliance, hence a retracting force on the maxillary anterior dentoalveolar part.
Workshop includes practical part for construction of the Seifi Functional appliance. It covers wire bending and acrylic processing of the appliances that are prepared on casts that are mounted in articulators.


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محل نشر یا ارائه:  کنگره 10 انجمن ارتودنتیست ها
سال ایرانی :  1391
موضوع:  ارتودنسی
Level:  Postgraduate

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