What has Changed and What Needs to be Changed with the Advent of Microimplant?Microimplants have revolutionized orthodontic anchors in an effort to maximize anchorage while reducing patient co-operation.Microimplants with a small diameter can improve treatment efficiency compared to conventional orthodontic treatment.The advent of microimplants has brought about major changes in treatment planning, epidemiology, and treatment outcomes.Numerous difficult cases or even cases that are close to impossible with conventional mechanics can be solved using microimplants.Despite a small number of side effects and remaining controversies, orthodontic microimplants have already become a widely used tool for routine orthodontic treatment to adjust anchorages without seeking patient cooperation.In this lecture, I would like to share the knowledge and experience of orthodontic treatment performed with microimplants, including the points that have changed since using microimplants and the points that require changes in the future.October 28 (Sat) 13:55-14:35Non-surgical Orthodontic Treatment of Adult Skeletal Class II Patients;Comparison between Lingual and Labial AppliancesBasically, the Biological Response to Orthodontic Force is the same for both invisible and traditional orthodontic appliances, but the Invisable Appliance is difficult to access, and the point of application of force and its response are different. appear, thus changing biomechanical considerations.In case of skeletal class II malocclusion of maxillary overgrowth and mandibular underdevelopment, lip protrusion and lip incompetence were the main complaints.Adolescents can be treated with orthopedic treatment.However, for adults, Orthodontic Camouflage Treatment or Orthognathic Surgery can be selected depending on the severity of the malocclusion.In this lecture, the possibility and effect of mini-implant treatment in non-surgical orthodontic treatment of adult skeletal Class II patients will be discussed by comparing the lingual device with the conventional labial device.October 28 (Sat) 14:50-15:30Non-extraction Approach with Use of Orthodontic Mini-implantsOrtho-dontic mini-implant (OMI) has recently been used less frequently because it can easily obtain the maximum source of fixation in orthodontic treatment, reduces the need for patient cooperation, and can simplify treatment. is gradually increasing.Traditional orthodontic treatment using fixed orthodontic devices is limited to cases where anterior and posterior skeletal incongruity, vertical skeletal and dentition incongruity, and asymmetry are not severe.Like its role in Distraction Osteo-genesis, OMI plays an important role in expanding the range of orthodontic treatment in three dimensions.The technique using 'low friction and weak force' together with OMI is especially effective in non-extraction cases.The purpose of this lecture is to discuss non-extraction cases successfully treated using Ortho-dontic Mini-implants.October 28 (Sat) 15:45-16:25A Novel, Simple Lingual Orthodontic Appliance for Incisor Protrusion and Open BiteOrthognathic Double Jaw Surgery in open bite is used as a method to improve Posterior Vertical Maxillary Excess.Anterior osteotomy (ASO) is intended to improve maxillary protrusion or grade II skeletal relationship.Recently, good results have been obtained only with orthodontic treatment for protrusions or open bites using specially designed lingual devices and TSADs.The newly devised lingual traction device enables simultaneous push-down of the anterior and posterior teeth along with the posterior movement of the 6 incisors, and consequently causes counterclockwise rotation of the mandible due to the depression of the maxillary dentition.The final result of this device is to improve the Class II malocclusion with vertical problems, and also to improve the open bite and the Gummy Smile.In this lecture, the speaker will systematically explain to the participants the development, operation, and clinical application of the device.October 28 (Sat) 16:40-17:20Intermaxillary fixation with TAD reduces orthognathic surgical relapseWe investigated the differences in skeletal and dental changes according to the type of intermaxillary fixation (IMF) in adult patients with grade III malocclusion treated with the same orthodontic surgery method.All subjects underwent Le Fort I Osteotomy and Bilateral Sagittal Split Ramus Osteotomy, and Rigid Fixation was performed.According to the type of intermaxillary fixation, it was divided into Surgical Archwire fixation group (Group 1) and orthodontic mini-screw fixation group (Group 2).The results of measurements of vertical and horizontal tooth positions immediately after surgery (T0), 3 months after surgery (T1), and 6 months after surgery (T2) were compared in each head radiograph.For statistical analysis, ANOVA and standard t-test were used.After surgery, the maxillary incisors tended to be inclined anteriorly in both groups, but there was no significant difference between the groups.The incisor overbite increased significantly from T0 to T1 in both groups, and the increase in overbite was smaller in the screw fixation group (group 2) than in the wire fixation group (group 1).As a result, intermaxillary fixation using miniscrews will be able to replace the existing intermaxillary fixation method.