No abstract available.
Hot Temperature* ; Orthodontic Wires*

No abstract available.
Malocclusion*

No abstract available.

No abstract available.
Child* ; Humans ; Urinary Tract Infections* ; Urinary Tract*

Craniofacial region is a musculodentoskeletal system that consists of many anatomical structures ; cranioskeletal structures, dental arches, and formation and functions of masticatory muscles have close correlations. Growth and development of craniofacial region are influenced by not only hereditory factors, but also environmental factors such as craniofacial muscles and surrounding tissues. On the contrary, however, study on changes in functions or adaptations of craniofacial muscles following changes of craniofacial skeletal structures has been somewhat insufficient. The author's purpose was to observe correlations between masticatory muscular functions and change patterns according to cranial skeletal structures and occlusion patterns ; for this, comparative study of muscle activity changes of preand post- orthognathic surgery states in skeletal Cl III malocclusion patients was performed. The selected sample groups were 15 normal male patients, 15 skeletal CI Ill pre-orthognatic surgery patients and 15 skeletal CI Ill post-orthognatic surgery patients. For each sample groups, cephalometric x-ray taking, masticatory efficiency test and measurements of muscle activities in anterior temporal muscle, masseter and upper lip in rest, clenching, chewing and swallowing were carried out. The following results were obtained: 1. In resting state of mandible, pre-surgery malocclusion group showed higher m activities in ant. temporalis, masseter and upper lip than post-surgery group. Post-surg, malocc. group showed significantly high m. activity only in upper lip compared to the normal group. 2. In clenching state, post-surg. malocc. group showed higher m. activities in ant. temporalis, masseter and upper lip than pre-surg. malocc. group. 3. In chewing state, post-surg. malocc. group showed higher m. activities in ant. temporalis and masseter than pre-surg, malocc. group ; on the other hand, decreased upper lip activity was noticed. 4. In swallowing state, post-surg, malocc. group showed lower upper lip activity than pre-surg. malocc. group but higher than that of the normal group. No significant difference in m. activities of ant. temporalis and masseter was noticed among the three groups. 5. Masticatory efficiency was lower in pre-surg, malocc. group than normal group; masticatory efficiency showed an increase in post-surg. malocc. group compared to the pre-surg. malocc. group. However, both groups showed significant differences compared to the normal group.
Ants ; Deglutition ; Dental Arch ; Growth and Development ; Hand ; Humans ; Lip ; Male ; Malocclusion* ; Mandible ; Mastication ; Masticatory Muscles ; Muscles ; Orthognathic Surgery ; Temporal Muscle

Various methods have been used on patients with skeletal Class II division 1 malocclusion. The activator, Frankel appliance, headgear, Herbst appliance, and Twin-block appliance are some examples. The ideal treatment effect using these appliances would be to inhibit horizontal and vertical growth of the maxilla while promoting mandibular growth and obtaining optimum dentition. The Teuscher appliance has a simultaneous combined headgear effect with maxillary growth inhibition and an activator effect with mandibular growth promotion. The purpose of this study was to examine how well these effects were clinically obtained and the results are as follows. 1. The forward growth of the maxilla was effectively inhibited. 2. The downward-forward growth of the maxillary dentoalveolar complex was inhibited. 3. Growth promotion of the mandible was not observed. 4. The overjet, overbite, molar key were effectively improved. 5. The protruded upper lip and facial profile were improved.
Dentition ; Humans ; Lip ; Malocclusion* ; Mandible ; Maxilla ; Molar ; Orthodontic Appliances, Functional ; Overbite

lateral cephalograms of 251 males and 286 females were taken and pubertal growth pattern of cranial base, maxillary and mandible of 7 to 17 years old Korean Children was evaluated. 10 landmarks and 16 analytical measurements were evaluated. Analytical measurement and annual difference for each age group was calculated and tested for statistical significance. Analytical measurements were classified into three groups which wee cranial base. maxillary and mandibular measurements and also classified into make and female measurements. Following results were achieved. 1. The circumpuberal growth spurt was earlier in Korean females than in males. 2. Cranial base, maxilla and mandible showed cirumpuberal growth. The cranial base showed a relatively smaller amount of growth the facial complex. 3. Middle and posterior cranial base length showed a greater increased than anterior cranial base length and circumpuberal growth spurt was also more definite. 4. The forward and downward growth of maxilla results from maxillary growth itself and transposition of the maxilla due to circumsutural growth around the maxilla. Ar-ANS and Ar-Pr which represent maxillary position relative to the cranial base showed more growth than ANS-PNS which represents maxillary bone growth. 5. mandible showed more vertical growth than horizontal growth but without significance. 6. Alveolar growth of maxilla and mandible show maximum growth rate of the time of permanent teeth eruption following loss of deciduous teeth. After this period alveolar growth shows a decreasing tendency.
Adolescent* ; Aging* ; Child* ; Female ; Humans ; Male ; Mandible ; Maxilla ; Skull Base* ; Tooth ; Tooth, Deciduous

Orthodontic tooth movement is closely related to the stress on the periodontal tissue. In this research the finite element method was used to observe the stress distribution and to find the best condition for effective tooth movement in the case of unilateral molar expansion. The author constructed the model of lower dental arch of average Korean adult and used .032" x .032" x 60mm TMA wire. The wire was deflected in the horizontal and vertical direction to give the 16 conditions. The following results were obtained; 1. When the moment and force were controlled properly the movement of anchor tooth was minimized and the movement of moving tooth was maximized. 2. As the initial horizontal deflection increased the buccal displacement of both teeth was also increased. As the initial vertical deflection increased the lingual movement of anchor tooth and the buccal movement of moving tooth increased. 3. When the initial horizontal and vertical deflection rate was 1.5 the effective movement of moving tooth was observed with minimal displacement of anchor tooth.
Adult ; Dental Arch ; Humans ; Molar* ; Tooth ; Tooth Movement

This study was undertaken to investigate the interrelationship between the growth change of mandible and the developmental age of growing girls in the longitudinal data from 7 years to 15 years. The data were obtained from maturation stage of cervical vertebrae through the serial lateral cephalogram, height increment records which was taken at one year interval, menarche date through interview. On the basis of findings of this study, the following conclusions were obtained. 1. In general the growth of mandible (Ar-Pog, Ar-Go, Go-Pog) showed two peaks of growth velocity. 2. The maximum growth of mandible (Ar-Pog, Ar-Go, Go-Pog) almost appeared between stage 3 and stage 4 in maturation of cervical vertebrae. 3. It showed the tendency that the maximum increment of height appeared faster than that of mandible (Ar-Pog, Ar-Go, Pog-Go). 4. The maximum growth of height almost appeared between stage 2 and stage 3 in maturation of cervical vertebrae. 5. It showed the tendency that the menarche appeared later than the maximum growth of mandible (Ar-Pog, Ar-Go, Pog-Go). 6. The menarche almost appeared at stage 4, stage 5 in maturation of cervical vertebrae.
Cervical Vertebrae ; Female* ; Humans ; Longitudinal Studies* ; Mandible* ; Menarche

Until now it has not surely been pointed out about the relation between the biting force and the facial types in scientific view. But it's correlation was assumed by several scientists: recently some literatures reported about the maximum biting force and facial types, but there's only a little articles about the relation between the biting force(biting force contain maximum biting force, chewing force and swallowing force) and facial type. So this study was, firstly, performed to establish the relation of the normal face and long face versus biting force. 2ndly it was performed to establish the relation between the difference in mouth opening degrees versus biting force. 3rdly it was performed to establish the relation between male and female versus biting force. Biting force was measured from 56 adults (normal 26, long 30) whose samples was selected from Yonsei university students and Hospital patients. Sample was divided into 2groups (normal and long) by lateral cephalogram. The results of this study was obtained as follows. 1. Maximum biting force and chewing force in long face was smaller than normal face. 2. When the thickness of transducer was changed from 6mm to 9mm, maximum biting force and chewing force was larger than before. 3. In case of comparing with male and female, male was larger than female in maximum biting force and chewing force.
Adult* ; Deglutition ; Female ; Humans ; Male ; Mastication ; Mouth ; Transducers