→犬齒埋伏~3

Pre-op (labial view), showing edentulous site at upper left canine region

Pre-op (palatal view), showing edentulous site at upper left canine region

Surgical exposure of canine and bonding of orthodontic button with a ligature wire tied to it for closed eruption technique

Post-op 3 weeks. Ballista spring connected to arch wire for eruption of canine

Complications Include:(犬齒埋伏的併發症)

¨ Poor aesthetics(美觀差)

¨ Root resorption can be expected in 12.5% of incisors adjacent to ectopic canines(牙根吸收)

¨ Internal/external resorption of canine(犬齒的內與外吸收)

¨ Infection associated with partial eruption(感染)

¨ Migration of adjacent teeth(鄰牙的移動)

Diagnosis:

Based on clinical (visual inspection and digital palpation) and radiographic examination. The

possibility of canine ectopia should be considered if the maxillary canine is not palpable in the

buccal sulcus by the age of 10-11 years, or if palpation indicates an asymmetrical eruption pattern

Treatment Options

¨ Leave in situ and accept aesthetics

¨ Surgical removal of ectopic tooth

¨ Exposure and bonding of tooth to bring it into alignment

Radiographic Examination

Radiographic examination involves two radiographs and application of the parallax principle

Horizontal Parallax

Anterior occlusal and periapical or two periapicals

Vertical Parallax

Anterior occlusal and DPT or periapical and DPT

Planning Surgical exposure and orthodontic alignment

Factors to be taken into consideration as outlined by the National Clinical Guidelines 1997:

¨ The patient should be willing to wear fixed orthodontic appliances

¨ The patient should be well motivated and have good dental health

¨ The degree of malposition should not be too great to preclude orthodontic alignment

Transmigration of Mandibular Canines: A Report of Six Cases and a Review of the Literature (罕見的下顎犬齒埋伏6案例)

Guidelines for Impacted Canine Treatment

→犬齒埋伏~5