Orthodontic Treatment Of Maxillary Impacted Canine

Objective: To explore in clinical Orthodontic guided eruption treatment ofimpacted maxillary canines, to study the characteristics and effectived of the maxillarycanine impaction treatment.Methods: A20year old Han female with Class III and the left maxillary canineimpaction was subdivision malocclusion patient selected as the subject. Mandibularhyperplasia and maxillary normal, the left maxillary canine low lip to the dislocation，left and right side of the maxillary lateral incisor teeth and the left maxillary firstpremolars crossbite and palate to the dislocation, the right side molar Class IIIrelationship, left molar neutral relationship. The crowding of Maxillary arch is12.4mm,the crowding of mandibular is4.7mm. The patient had a shallow overjet and overbite,and her maxillary dental midline deviated2mm to the left relative to the facial midline.In accordance with the canine root development,ambush situations, clinicalexamination and medical imaging, analysis of the position of the maxillary canines,impacted teeth and health status of the hard and soft tissues around and the method ofsuitable for use. Use fixed appliance removal of four first premolars to relieve crowdingand modified Nance arch to traction23impacted teeth to normal dentition. It is to usethe plastic base of the maxillary anterior palate, alveolar ridge, and the hard palatemucosa as anchorage, use elastic rubber chain speed of light per month about1mmtraction force, the force is about60g. At the same time, use the German BioQuick3.0metal self-ligation brackets, low-friction self-ligation correction technology aligneddentition, leveling arch. Cephalometric film be taken in before and after treatment, andthen measuring the upper and lower jaw and lip inclination of the upper and lowerincisors and the side face of the soft tissue changes; shooting X-ray radiograph toobserve the change of of23crowns mobile position and the situation of23rootresorption.Results: The course of orthodontical treatment lasted20months. Modified Nance arch traction23is moved to a normal position, and reduces the molar anchorage loss.Modified Nance arch traction23is moved to a normal position, and reduces the molaranchorage loss. The Extraction treatment for sufficient clearance so that the upper andlower dentition aligned, and being the center line and get a class I molar relationship,and to improve the side of the face. The self-ligation appliance is effectively shortenorthodontic treatment time. The patient is satisfactory with the results.(1) The patient isadult, but the changes of incisor labial inclination and class III apron traction makesmandible backward and downward rotation. The therapy results show the SNB wasreduced and ANB was significantly increases, low angle and class III face improved.(2)The extraction treatment to provide sufficient clearance for23moving into the columnand improved labial inclination of the upper incisors and class I molar occlusion.(3)After treatment,23pulled into the normal dentition. The crowns moved to the alveolarbone in the normal position, with contralateral normal eruption of canines no difference.It’s pulp, gums, periodontal are healthy, but the root no obvious absorption.(4) Becausethe patient’s oral health is not good, the23labial gingival mild redness in traction23enqueue later. Improved after periodontal treatment, gingival inflammation was broughtunder control, morphology gums back to normal.(5) The course of orthodonticaltreatment lasted20months, the self-ligation adjusting technique the impacted toothtreatment time is relatively short.Conclusion: The case modified Nance arch as anchorage, traction23to its normalposition. To prevent the left posterior teeth forward and then occupy the gap preparedfor23, reduced anchorage loss; extraction the four first premolars to improve the side ofthe face, adjusting the molar relationship, and to improve the incisor teeth shaft angle;The self-locking appliance technology successfully shorten the treatment time, savingthe patient time costs, so that patients feel more comfortable in the treatment process, isan effective orthodontic treatment of impacted teeth.