Bilateral Scissor Bite Treated by Rapid Mandibular Expansion Following Corticotomy

Abstract

Scissor bite is defined as buccal displacement of the maxillary posterior teeth, with or without contact between the lingual surface of the maxillary lingual cusp and the buccal surface of the buccal cusp of its mandibular antagonist. Here we report treatment of bilateral scissor bite in the posterior region using rapid expansion following corticotomy. The patient was a boy aged 17 years and 11 months in whom skeletal maxillary prognathism with bilateral scissor bite was diagnosed. The distance between the tips of canines and the mesial buccal cusps of the first molars was increased by use of a bonded rapid expansion appliance following corticotomy. Appropriate occlusion and lateral profile were obtained and maintained after retention. In addition, no gingival recession, hyperesthesia, or root surface caries occurred. These results suggest that mandibular lateral expansion following corticotomy is effective in young adult patients with a narrow mandibular arch.

Clear Aligners and Miniscrews in a Scissor Bite Adult Treatment

“…Distraction osteogenesis consists in the biological process of bone formation between preexisting bone segments that are progressively separated by controlled traction. The intermolar and intercanine distances usually remain stable after expansion, and healing/stability usually occurs within 3 to 4 months, so that the distraction device can be removed and orthodontic treatment subsequently initiated [5,14].…”

“…Sakamoto et al [5] demonstrated the effectiveness of lateral mandibular expansion treatment after corticotomy in a young adult patient with a skeletal scissor bite. According to these authors, expansion by corticotomy reduces the gingival recession risk and hyperesthesia and also guarantees posttreatment stability.…”

“…Keep the scissor bite untreated, negatively affects masticatory function and can lead to temporomandibular joint abnormalities [5]. Patients are also often characterized by having struggle in lateral functional movements [6].…”

Corticotomy for orthodontic tooth movement

“…Karthikeyan et al79 treated a Class I malocclusion and open bite patient by removing the bulky anterior cortical bone and intruding the anterior teeth. Corticotomies can also be used for canine retraction5480, anterior teeth retraction, decrowding5381, molar uprighting37, correction of a scissor bite82, and rapid maxillary expansion. Lines83 introduced a method for the correction of a maxillary constriction that applied incisions on the lateral walls of the maxillary sinus and mid-palatal sutures.…”

Trauma-induced unilateral buccal nonocclusion

“…Buccal nonocclusion is defined as maxillary teeth not occluding with mandibular teeth and overlapping buccal to the mandibular arch. [1] This problem has two different etiologies: congenital or traumatic. [2] In trauma patients, this event often is related to fracture of one jaw, so correction should focus on it; however, in orthognathic patients, this results from combination of upper jaw widening and lower jaw narrowing.…”