Increased Waist Circumference after One-Year Is Associated with Poor Chewing Status.

Background: This study aimed to investigate the relationship between an increase in waist circumference (WC) after 1 year and self-reported chewing status in 10,870 Japanese adults who had received health checkups. Subsequently, 8068 participants were included in the final analysis.

Methods: We defined an increase in WC ≥ 5 cm after 1 year as an unhealthy increase; in total, 613 (7.

Maxillary Development and Dental Arch Relationships Following Early Two-Stage Palatoplasty: A Comparative Study.

Objective: To examine skeletal morphology and dental arch relationships at 8 years of age following early 2-stage palatoplasty, which consists of soft palate plasty at 1 year of age and hard palate closure at 1.5 years of age, and to compare the results with those of conventional pushback palatoplasty.

Design: Retrospective.

Analysis of pretreatment factors associated with stability in early class III treatment.

Background: The purpose of this study was to identify pretreatment factors associated with the stability of early class III treatment, since most orthodontists start the treatment with their uncertain hypotheses and/or predictions. Subjects consisted of 75 patients with a class III skeletal relationship (ANB < 2° and overjet < 0 mm) who had been consecutively treated with rapid maxillary expansion and facemask and followed until their second phase treatment. The patients were divided into two groups according to whether they showed relapse in follow-up.

Influence of dental education on eye gaze distribution when observing facial profiles with varying degrees of lip protrusion.

Objectives: The purpose of the present study was to investigate the influence of dental education on eye gaze distribution when perceiving facial profile images with varying degrees of lip protrusion.

Methods: Fifty-one subjects with dental education (dental-education group) and 47 without dental education (no-dental-education group) were included in this study. The eye gaze distribution of the subjects was recorded for 10 seconds using a non-contact eye tracker when determining whether or not the subjects judged each various facial profile image inappropriate.

Occlusion at 5 Years of Age Following Hard Palate Closure With Vestibular Flap.

Objective: This study aims to assess occlusal relationships and frequency of oronasal fistula at 5 years of age following 2 hard palate closure techniques and to compare results.

Design: Retrospective longitudinal study.

Setting: Institutional study.

Accuracy and head positioning effects on measurements of anterior tooth length using 3-dimensional and conventional dental panoramic radiography.

Introduction: The purposes of this study were to examine the accuracy and the head positioning effects on measurements of anterior tooth length using 3-dimensional (3D) and conventional dental panoramic radiography and to investigate whether 3D panoramic radiography is suitable for the evaluation of anterior tooth length.

Methods: A simulated human head was radiographed at 4, 8, and 12 mm displaced positions, and at 5°, 10°, and 15° tilted positions from the standard head position using 3D and conventional panoramic radiography, and also using cone-beam computed tomography. Anterior tooth lengths were measured on the panoramic and cone-beam computed tomography images.

Cephalometric Outcomes of Maxillary Expansion and Protraction in Patients With Unilateral Cleft Lip and Palate After Two Types of Palatoplasty.

Objective: To clarify the differences in the long-term effects of maxillary expansion (ME) and protraction (MP) in patients with complete unilateral cleft lip, alveolus, and palate (UCLP) undergoing two types of palatoplasty.

Design: Retrospective longitudinal study.

Setting: Institutional study.

Influence of Different Palatoplasties on the Facial Morphology of Early Mixed Dentition Stage Children With Unilateral Cleft Lip and Palate.

Objective: To compare the maxillofacial morphology in the early mixed dentition phase between two patient groups with unilateral cleft lip, alveolus, and palate who underwent different types of palatoplasty.

Design: Cross-sectional study.

Setting: An institutional study.

Demonstration of a sex difference in the predictability of widths of unerupted permanent canines and premolars in a Japanese population.

Objectives: (1) To identify any differences in the accuracy of the prediction of the summed widths of unerupted permanent canines and premolars for males vs females and, if differences are identified, (2) to examine the sex differences in the best combination of independent variables and (3) to evaluate the practical accuracy using our models for both sexes, respectively.

Materials And Methods: Records for 200 orthodontic patients (100 males and 100 females) with discernible tooth crowding in the permanent dentition were selected. Mesiodistal tooth crown widths, dental arch widths, and basal arch lengths were measured.

Orthodontic treatment of malocclusion improves impaired skillfulness of masticatory jaw movements.

Objective: To investigate whether individuals with malocclusion show less skillfulness, as represented by kinematic parameters that characterize masticatory jaw movement, compared with those having normal occlusion and, if so, to examine whether more skilled movements are achieved after completion of orthodontic treatment.

Materials And Methods: Lower incisor point movement in space during gum chewing was recorded, and the kinematic traits of such movement were compared among four subject groups: a Control Group (36 females with good occlusion), a Malocclusion Group (24 females with dental malocclusions), an Extraction Group (31 females who had received orthodontic treatment with premolar extraction) and a Nonextraction Group (27 females who had been treated orthodontically without tooth extraction). Before treatment, all subjects in the three experimental groups exhibited dental malocclusions and skeletal class I jaw-base relationship.

Improvement in smoothness of the chewing cycle following treatment of anterior crossbite malocclusion: a case report.

This is a report of a case in which improvement in masticatory jaw movement kinematics occurred following orthodontic treatment. A patient who demonstrated a skeletal Class II jaw relationship, with anterior crossbite between the right upper and lower lateral incisors, underwent treatment with an edgewise appliance. The trajectories and smoothness of the patient's jaw-closing movement were compared before and after orthodontic treatment.