Clinical application of maxillary tissue bone-borne expander and biocreative reverse curve system in the orthodontic retreatment of severe anterior open bite with transverse discrepancy: A case report

Abstract

Anterior open bite and transverse discrepancy are often accompanied by hyperdivergent skeletal patterns. In addition, degenerative joint disorders and vertical maxillary excess contribute to an unfavorable convex facial profile with a retruded chin. Correction of this complex three-dimensional problem with orthodontic treatment alone is considered challenging owing to anatomical limitations. Moreover, a history of orthodontic treatment with premolar extraction makes retreatment difficult. This case report illustrates the application of a maxillary tissue bone-borne expander and biocreative reverse curve system in a 23-year-old female patient with a severe anterior open bite and transverse discrepancy who underwent orthodontic treatment with four premolar extractions. By setting the treatment target under precise diagnosis and using appropriate appliances, a satisfactory treatment result could be achieved without orthognathic surgery.

Miniscrews position for a tissue bone borne palatal C-expander affects the displacement pattern of nasomaxillary complex: a finite element study

“…One of the main goals of using a bone-borne palatal expander is to minimize the buccal inclination of posterior teeth during expansion. 21 , 22 Since the expander is not connected to the teeth, the molars themselves do not experience buccal inclination in the alveolar bone. However, buccal inclination of the posterior teeth may still occur when using a bone-borne palatal expander, as the center of expansion is located in the upper part of the facial bone.…”

“…A specific type of tissue- and bone-borne expander, known as the C-expander, has been introduced and utilized for several decades. 19 – 22 Unlike other expansion devices where miniscrews are placed based on the expander design, the C-expander is distinctive in that it involves first strategically placing the miniscrew and then designing the expander body accordingly. Studies have indicated that when compared to tooth-bone-borne palatal expanders, the use of the C-expander results in less molar inclination and buccal alveolar bone loss.…”