Learn More
  • Q Nie, J Lin
  • 1999
The purpose of this study was to determine whether there is a prevalent tendency for intermaxillary tooth size discrepancies among different malocclusion groups. This study consisted of 60 subjects who served as the normal occlusion group and 300 patients divided into 5 malocclusion groups (ie, Class I with bimaxillary protrusion, Class II Division 1, Class(More)
INTRODUCTION The purpose of this study was to clarify the frontal chewing patterns of various crossbite malocclusions. METHODS A mandibular kinesiograph was used to record the masticatory movements of 106 subjects (ages, 12-35 years) with crossbite malocclusion and 22 subjects (ages, 16-30 years) with normal occlusion. The chewing patterns were classified(More)
The purpose of the study was to analyze the effects of nonsurgical treatment on subjects with a severe skeletal Class III deformity and to directly evaluate dental and facial profile changes. Eighteen patients with severe skeletal Class III malocclusions (5 males, 13 females), diagnosed as indication for orthognathic surgery, were included in the study. The(More)
BACKGROUND Platelet-derived growth factor C (PDGF-C) was recently identified as a member of the PDGF ligand family. Some observation suggests that PDGF-C could play an important role in palatogenesis highlighted by the Pdgfc(-/-) mouse with cleft palate, which led us to examine the mechanism of PDGF-C signaling in palatogenesis. It is well known that(More)
INTRODUCTION The purpose of the study was to use euclidean distance matrix analysis to compare dental arch forms between subjects with Class II Division 1 malocclusions and normal occlusions. METHODS The sample consisted of 60 subjects with Class II Division 1 malocclusions and 60 subjects with normal occlusions, all between 13 and 17 years of age.(More)
OBJECTIVE To evaluate the validity and reliability of the cervical vertebral maturation (CVM) method with a longitudinal sample. MATERIALS AND METHODS Eighty-six cephalograms from 18 subjects (5 males and 13 females) were selected from the longitudinal database. Total mandibular length was measured on each film; an increased rate served as the gold(More)
OBJECTIVES To test the hypothesis that the sagittal position of the anterior teeth has no effect on pharyngeal airway dimension or hyoid bone position and to investigate the influence of orthodontic retraction of the anterior teeth on each section of pharynx and hyoid position. MATERIALS AND METHODS Forty-four Class I bimaxillary protrusion adults,(More)
INTRODUCTION In orthodontic treatment, teeth can relapse after tooth movement without retention. The aim of this study was to evaluate the inhibition effects of local osteoprotegerin (OPG) gene transfer on orthodontic relapse. METHODS Eighteen male Wistar rats were divided into 3 groups. The maxillary right first molars of all animals were subjected to(More)
The aim of this study was to validate a newly developed three-dimensional (3D) structured light scanning system in recording the facial morphology. The validation was performed in three aspects including accuracy, precision and reliability. The accuracy and precision were investigated using a plaster model with 19 marked landmarks. The accuracy was(More)
INTRODUCTION Lingual orthodontics has developed rapidly in recent years; however, research on torque control variance of the maxillary incisors in both lingual and labial orthodontics is still limited, especially studies with 3-dimensional finite element methods. Thorough understanding of the biomechanical differences of incisor torque control during(More)