Periodontal treatment and orthodontic treatment must work closely together for comprehensive dental therapy and a complementary relationship is ideal. In controlling periodontal disease, tooth malposition makes plaque control and occlusion significantly more difficult. It has been suggested that the presence of periodontal disease prior to orthodontic treatment is not a contraindication to orthodontic treatment if inflammation is under control. On the other hand, esthetic and functional periodontal problems such as gingival recession, crown shortening, and widening of the embrasure could occur after orthodontic treatment. In many cases, such problems can be treated by periodontal plastic surgery and/or tooth restorative procedures if appropriate preoperative and postoperative diagnoses are made. In particular, orthodontic treatment of teeth that have been dislocated from the bone housing with gingival recession prior to orthodontic treatment should be carefully indicated because gingival recession could improve as the teeth are moved into the bone housing.

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In lingual orthodontics, setup is a mandatory step due to the anatomic variability of the lingual surfaces among patients. However, the manual setup has limitations because of its complicated laboratory procedures and requires time and specialized laboratory equipment. In addition, the manual setup accuracy is influenced by skill of the dental technician. Advances in digital technologies such as intraoral digital scanners and 3D model scanners and CAD/CAM are providing new possibilities in orthodontics. Recently, the application of CAD/CAM can be used to create digital setup and transfer jig. Both the digital setup and ordinary manual setup have advantages and disadvantages. In this report, a description of a new method of laboratory preparation for the indirect bonding of lingual brackets is given by merging manual and digital techniques.

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In lingual orthodontic treatment, the anchorage is very strong, especially in the mandible. Therefore, in the minor crowding cases, it is expected that the retraction of lower anterior teeth is possible by its biomechanics in nonextraction cases. In addition, miniscrews have been often used relatively in current years. Moreover, it is also possible to perform IPR for the deficiency of space. I think that lingual orthodontics can treat in more cases without extraction of premolars than with labial orthodontics by comprehensively utilizing them. Considering these factors, I report that lingual orthodontic treatment performed on two cases of malocclusion with different types, and good results were obtained.

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In orthodontic treatment, it is necessary to formulate a treatment plan to acquire a normal occlusion and to bring the facial morphology closer to the ideal image. An average image is one of the ideal images. Orthodontists set goals and treat to approximate the value of each patient's measurement item to the mean. I investigated the value of distances from E-line in 70 adults with normal occlusion. I prepared the subject's 3D facial models using a non-contact 3D laser scanner, and measured the distances with a program for analyzing 3D shapes. The results were such as the mean of distance from E-line was found that upper lip:－0.77 mm and lower lip：＋0.80 mm. To verify that these values are useful, I will describe with the following 3 case reports. Case 1：A bimaxillary high-angle case with skeletal ClassⅡ tendency Case 2：Angle ClassⅡ div.1 case with thin lips Case 3：Angle ClassⅡ div.1 case with thick lips

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When the tooth size ratio of the upper and lower anterior teeth do not match, it may be difficult to formulate an effective treatment plan. Particularly in cases whereby a patient has fused teeth, it is difficult to achieve aesthetic treatment goals. The patient was a 17-year-old male at the first visit, with a case of Angle class I crowding; the mandibular right central and lateral incisor teeth were fused. The fused tooth width measured 9.0 mm. The results of simulation using a setup model with the TOP analyzer system showed that opening a gap in the mesiodistal area of the fused tooth and restoring it as two teeth with laminate veneers would offer an effective aesthetic treatment. For orthodontic treatment, four upper and lower first premolar teeth and four third molar teeth were extracted, and upper and lower lingual braces were used. After leveling was completed, the maxilla was retracted using TADS. Post orthodontic simulations of aesthetics and functionality were performed with a temporary mock-up and a laminate veneer restoration was adopted with high patient satisfaction. As a result, we conclude that laminate veneers, which restore fused teeth to appear as two teeth, are considered to be a very effective treatment option.

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We introduce a method for designing setup and IDB trays to fabricate lingual orthodontic appliances in a digital environment. In addition, we report a build-in base technique that adds torque, angulation, and rotation to a resin base, which is difficult to achieve using conventional plaster casts.

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Some complication of positioning brackets, bonding brackets and debonding brackets are common problems associate with lingual orthodontic practice. Now it has become possible that a new delivery technique for an indirect bonding and a new debonding technique using with an ultrasonic device could provide us safer, easier and time less methods for lingual orthodontic practice.

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皆様は，どのような矯正歯科へ通いたいと思いますか？近年〈神対応〉という表現をよく耳にしますが，これはサービスに関する手際の良さや，配慮に満ちたサービスなどに対して最大級の高評価を表す語として用いられるそうです．医療やサービスを受ける際には，誰しもがこの神対応を望んでいると思います．では，矯正歯科における神対応とは一体どのような対応なのでしょうか．本文では，スタッフ一人一人が役割をしっかりと果たし，患者さんに通いたいと思っていただけるような神対応をするために，私たちに必要なことは何かを伝えたいと思います．

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