Palatally Displaced Canine and Anterior Crossbite Management with a Combination of Palatal Flap Window and MEAW Technique: A Case Report Canine impaction is a frequent problem, ranking third in occurrence behind the impaction of the mandibular and maxillary third molars. Palatally displaced canines (PDCs) require more omprehensive treatment and are more challenging to manage. This case report describes the management of a rotated palatally impacted permanent maxillary right canine using the open palatal flap window method and the multiloop edgewise arch wire (MEAW) technique. A 19-year-old female patient presented with dental misalignment, which included a skeletal Class I relationship with Angle Class I malocclusion, a protruding lower jaw, anterior crossbite, and the upper left canine being palatally impacted. The panoramic radiograph indicated the existence of a Type II impaction of the canine teeth (Yamamoto classification). The treatment employed the MEAW technique to expand the maxilla and handle an anterior crossbite. The palatal window flap technique was utilized to achieve access to the maxillary right canine by using a button chain and ligation to the upper archwire. The posttreatment outcomes demonstrated satisfactory eruption and alignment of the maxillary right canine, correction of the anterior crossbite at the maxillary right lateral incisor, and realignment of the midline. One year after retention, a satisfactory occlusion was maintained without recurrence of the anterior crossbite. The use of the open palatal window flap technique and button chain application is effective in correcting PDCs and achieving adequate tooth alignment within the dental arch.

Effect of Immersion in 0.12% Chlorhexidine Solution on Corrosion and Unloading Force of Rhodium Coated NiTi Archwires The types of orthodontic archwires commonly used in orthodontic treatment are NiTi non-coated and rhodium-coated. Corrosivity and unloading force on the wires may undergo changes due to the use of mouthwash, specifically chlorhexidine 0.12%. The aim of this study was to investigate the effect of immersing NiTi non-coated and rhodium-coated with a diameter of 0.014” in chlorhexidine 0.12% solution on their corrosivity and unloading force after immersion for 1, 7, and 14 days. A total of 48 NiTi non-coated and rhodium-coated archwires were divided into 12 groups (n = 4 each) cut to a length of 30 mm. They were grouped based on immersion media (chlorhexidine 0.12% and artificial saliva) and immersion time (1, 7, 14 days). In the chlorhexidine immersion group, the wires were immersed and shaken for one minute twice a day, then rinsed and immersed in artificial saliva. Samples were tested using atomic absorption spectrophotometry (AAS) and a three-point bending test. Statistical analysis was performed using two-way ANOVA, DMRT 5%, and linear regression. The NiTi non-coated archwires immersed in chlorhexidine exhibited high corrosivity of 0.0083 ppm and unloading force of 2.0275 N after 14 days. SEM analysis of NiTi non-coated archwires revealed a rougher surface with larger porosities, while rhodium-coated archwires showed peeling of the coating and pitting. The immersion of non-coated NiTi archwire and rhodium-coated archwire in chlorhexidine solution on the 14th day has the highest corrosivity and unloading force compared to immersion durations on days 1 and 7.