Orthodontic treatment of gummy smile by maxillary total intrusion with a midpalatal absolute anchorage system / 대한치과교정학회지

This article describes the orthodontic treatment of a 31-year-old Korean female patient with gummy smile and crowding. The patient showed excessive gingival display in both the anterior and posterior areas and a large difference in gingival heights between the anterior and posterior teeth in the maxilla. To correct the gummy smile, we elected to intrude the entire maxillary dentition instead of focusing only on the maxillary anterior teeth. Alignment and leveling were performed, and a midpalatal absolute anchorage system as well as a modified lingual arch was designed to achieve posterosuperior movement of the entire upper dentition. The active treatment period was 18 months. The gummy smile and crowding were corrected, and the results were stable at 21 months post-treatment.

Assessment of antero-posterior skeletal relationships in adult Korean patients in the natural head position and centric relation / 대한치과교정학회지

OBJECTIVE: This study aimed to verify the intra-individual reproducibility of the natural head position (NHP) in adult Korean patients in the centric relation (CR) position and to prove the inter-individual variability of the Frankfurt horizontal (FH) plane and sella-nasion (SN) line compared to the true horizontal line (THL). In addition, the study aimed to investigate the correlations between linear measurements from A-point and B-point to the nasion true vertical line (NTVL) and angular measurements from A-point and B-point to the SN line. METHODS: Two lateral cephalograms were taken of 116 subjects (23 males, 93 females) with CR wax bites in a NHP at a one-week interval. RESULTS: Method errors of three variables and intraclass correlation coefficients of six parameters proved the intra-individual reproducibility of NHP (p 0.05), but it was clinically variable (SD 3.89degrees) on the inter-individual level. Conversely, the angle of the SN line to the THL was significantly different from 7degrees (p < 0.05). Very low correlation was found between the linear measurements and angular measurements of A-point and B-point (p < 0.01). CONCLUSIONS: The NTVL could be a useful reference line for assessing the antero-posterior position of the maxilla and mandibleof Korean adult patients in NHP and CR.

Incisor inclination indicator for anterior torque control during retraction in lingual orthodontic treatment / 대한치과교정학회지

A device called incisor inclination indicator to control the axial inclinations of the incisors in the diagnostic setup is introduced. It is used to control the retraction of the maxillary and mandibular incisors. In this article, we describe the use of the incisor inclination indicator to prescribe adequate torque into the anterior lingual brackets and evaluate the results of treatment in a bimaxillary dentoalveolar protrusion case that underwent orthodontic treatment with the pretorqued anterior lingual brackets. Retraction of the maxillary and mandibular incisors was achieved with careful control of the axial inclination. It is indicated that the use of the incisor inclination indicator is an effective adjunctive laboratory procedure for anterior torque control during retraction in lingual orthodontic treatment.

Correction of unilateral posterior crossbite through the use of RME and multibracket appliances / 대한치과교정학회지

Problems in the transverse plane of space are seen primarily as posterior crossbites, which may be due to displacement of teeth relative to their supprting bone (dental crossbite), or to a narrow maxilla or wide mandible (skeletal crossbite). It is important to specify, in the sense of the location of the anatomic abnormality, why the crossbite exists. Where a maxillary expansion may be considered as part of a treatment aiming to coordinate the mazillary and mandibular arches. For thr correction of maxillary skeletal constriction, rapid maxillary expansion procedure (RME) is indicated. In this case report, the evaluation of P-A cephalo-grams before, after RME, and after active treatment will serve as a focus.