1.A statistical study on the effect of tooth size and dental arch size upon the crowding.
Korean Journal of Orthodontics 1990;20(2):217-226
The purposes of this study were to clarify the effect of tooth size and arch size upon the crowding. 175 upper casts were measured and following conclusions were made. 1. Tooth size, intermolar width, 2nd premolar width of crowded group were not significantly different from those of noncrowded groups. 2. Intercanine width, arch length of noncrowded group were significantly larger than crowded group. 3. Multiple regression equations were derived by using tooth size, arch perimeter, arch length, intermolar width.
Bicuspid
;
Crowding*
;
Dental Arch*
;
Statistics as Topic*
;
Tooth*
2.Orofacial odontogenic infections associated with medical diseases
Weon Gyeom KIM ; Gun Joo RHEE ; Byoung Keun AHN
Journal of the Korean Association of Maxillofacial Plastic and Reconstructive Surgeons 1991;13(2):222-230
No abstract available.
3.Clinical Observation on Admitted Patient in Nursery.
Back Hee LEE ; Byoung Hoon LEE ; Don Hee AHN ; Keun Chan SOHN
Journal of the Korean Pediatric Society 1989;32(4):478-485
No abstract available.
Humans
;
Nurseries*
4.The Findings of 2D and M-mode Echocardiography in Young Insulin-Dependent Diabetes Mellitus.
Byoung Rei CHO ; Jae Wook KO ; Young Jin HONG ; Don Hee AHN ; Keun Chan SOHN
Journal of the Korean Pediatric Society 1990;33(1):88-93
No abstract available.
Diabetes Mellitus, Type 1*
;
Echocardiography*
5.Clinical results of srthroscopic surgery of the temporomandibularjoint disease.
Hoon CHUNG ; Weon Gyeom KIM ; Seong Pal HONG ; Byoung Keun AHN ; Yukou ISUMI ; Koji KINO
Journal of the Korean Association of Oral and Maxillofacial Surgeons 1991;17(3):19-28
No abstract available.
6.Clinical results of srthroscopic surgery of the temporomandibularjoint disease.
Hoon CHUNG ; Weon Gyeom KIM ; Seong Pal HONG ; Byoung Keun AHN ; Yukou ISUMI ; Koji KINO
Journal of the Korean Association of Oral and Maxillofacial Surgeons 1991;17(3):19-28
No abstract available.
7.The initial tissue change to the immediate orthodontic force following buccal horzontal subapical osteotomy of maxilla.
Kwang Jin HONG ; Byoung Keun AHN
Korean Journal of Orthodontics 1995;25(1):101-110
The purpose of this study was to observe the tissue response to the orthodontic force applied immediately after buccal horizontal subapical osteotomy of maxilla. Five mongrel cats weighing about 2.5 Kg were used for this experiment. The left upper canine and premolar of each cat served as a experimental side and the right ones as a control side. On the experimental side, a 100gm orthodontic force was applied between the upper canine and premolar immediately after the osteotomy. On the control side, the same orthodontic force was applied without the osteotomy. After 7days, the experimental animals were sacrificed. The results were as follows: 1. In the pressure zones of the experimental group, significant increase of osteoclasts and direct resorption along the alveolar bone surface was observed as compared with those of the control group. 2. In the pressure zones of the experimental group, a less extensive hyalinized zone was observed than those of the control group. 3. In the pressure zones of both group, no root resorption was found. 4. In the tension zones of the experimental group, new bone deposition increased along the alveolar bone surface as compared with those of the control group. In conclusion, the results suggest the possibility that early orthodontic treatment after orthognathic surgery may have some benefits if the stability of the repositioned segment at surgery is secured.
Animals
;
Bicuspid
;
Cats
;
Hyalin
;
Maxilla*
;
Orthognathic Surgery
;
Osteoclasts
;
Osteotomy*
;
Root Resorption
8.Effects Of Chitosan On Human Osteoblasts.
Ki Hong KIM ; Young Ju PARK ; Jun Woo PARK ; Yong Chan LEE ; Byoung Ouck CHO ; Byoung Keun AHN
Journal of the Korean Association of Oral and Maxillofacial Surgeons 2002;28(4):280-285
As the result of the study concerning "bone inducibility of chitosan", 1. "BMP-2"was observed mainly through the test when the "osteoblast"is exposed to the "chitosan". The expression of BMP-2 was 542.63 times compared to control after 2 hours exposure and it was maintained 16.60 times till 24 hours. 2. The expression of BMP-4 was decreased compared to control during exposure. 3. The expression of BMP-7 revealed two peaks during exposure. 4. The expression of osteocalcin was increased in early phase, and then decreased. Although it is not clear whether the "chitosan"is clinically effective material as a "bone induction material", we could say that it has a function for bone induction. Further detailed study will be required.
Bone Morphogenetic Protein 7
;
Chitosan*
;
Humans*
;
Osteoblasts*
;
Osteocalcin
9.A comparative study about the position of upper and lower jaws, and first molars in normal occlusion and Angle's Class I,II,III malocclusions.
Byoung Mo YUN ; Byoung Keun AHN ; Geon Ju RHEE ; Sun Hae KIM ; Young Ju PARK ; Ho Jin HAN
Korean Journal of Orthodontics 1993;23(4):633-644
There has been so much controversies about the position of upper and lower jaws, and their first permanent molars in normal occlusion and Angle's class I,II,III malocclusions. So, the purpose of this study is to compare the position of upper and lower jaws, and their first molars in normal occlusion and Angle's class IIIIII malocclusions by lateral cephalometric analysis. The sample consisted of one hundred and twenty girls(thirty in each group) who had completed growth. The findings of this study were as follows: 1. In class I malocclusion, both maxilla and mandible were slightly posterior position than normal occlusion, but they showed harmonious relationship. 2. In class II malocclusion, the mandible was greatly retruded, and the maxilla was also slightly retruded to the cranial base as compared with normal occlusion. 3. In class III malocclusion, the maxilla was significantly retruded to the cranial base, but no significant difference was found in mandibular position as compared with normal occlusion. 4. The maxillary first molar was located at posterior position in class II malocclusion, and anterior position in class III malocclusion to the cranium, so that the rotation of mandible was influenced by that. 5. The mandibular first molar showed constant relationship to the mandible in all four groups, but different position to the cranial base in direct proportion to the mandibular position. 6. On the treatment planning of class II malocclusion, it seems to be better to promote the mandibular horizontal growth by inhibiting the vertical growth of maxillary molar area, and on the treatment planning of class III malocclusion, it seems to be better to promote the antero-inferior growth of maxilla and to promote the mandibular vertical growth by inducing the vertical growth of maxillary molar area.
Jaw*
;
Malocclusion*
;
Mandible
;
Maxilla
;
Molar*
;
Skull
;
Skull Base
10.Tetanus trismus associated with facial eletrical burn.
Tae Young HA ; Jin Han KANG ; Mee Ran SHIN ; Byoung Keun AHN ; Mi ja KIM
Journal of the Korean Association of Oral and Maxillofacial Surgeons 2006;32(4):380-383
Tetanus is rare in Korea due to the introduction of vaccination programs and the advancement in public health. Its common signs are trismus, voice disturbance, neck stiffness, and difficulty in swallowing, etc. A 56 years old man was injured by grasping a high voltage electric cable. After the accident, he fell down on a steel plate and had a head trauma. When he visited Emergency Department, there was multiple electric burn wound on left arm and left facial area. He was hospitalized on a department of neurosurgery, because intra cranial hemorrhage was presumed. 12 days later, he was referred to department of OMFS with developed painful masseter spasms and trismus. That night he violently bit his tongue with his denture. Because masseter muscle and temporal muscle constriction was involuntary, tongue was lacerated and denture was distorted. At first we supposed that the symptom was related with neurologic disturbance following head trauma or electric shock. But it was revealed that trismus was caused by tetanus on an electrophysiological test. By using mechanical ventilation and administration of tetanus immunoglobulin, muscle-relaxant, and sedatives at ICU, symptoms had subsided (4-weeks). Because tetanus is rare disease, we rarely suppose tetanus infection to be a cause of a trismus. Especially it is more difficult to diagnose in patient who has head trauma, burn and neurologic problem as in this case.
Arm
;
Burns*
;
Burns, Electric
;
Constriction
;
Craniocerebral Trauma
;
Deglutition
;
Dentures
;
Emergency Service, Hospital
;
Hand Strength
;
Hemorrhage
;
Humans
;
Hypnotics and Sedatives
;
Immunoglobulins
;
Korea
;
Masseter Muscle
;
Middle Aged
;
Neck
;
Neurosurgery
;
Public Health
;
Rare Diseases
;
Respiration, Artificial
;
Shock
;
Steel
;
Temporal Muscle
;
Tetanus*
;
Tongue
;
Trismus*
;
Vaccination
;
Voice Disorders
;
Wounds and Injuries