• Journal of TMJ Balancing Medicine
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• v.12 no.1
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• pp.28-31
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• 2022

위에서 살펴본 바와 같이 나는 급성 턱관절장애의 경우, 첫번째 유형은 주로 턱관절 디스크공간의 문제와 하악의 위치를 바로잡아주는 근육의 문제가 주 원인일 것으로 추정하고 있다. 만약 턱관절 디스크공간이 정상공간이라면 턱의 지그재그 움직임이나 턱관절잡음, 턱통증, 턱탈구, 그리고 개구장애 등이 발생할 수 없기 때문이다. 그리고 근육의 문제 중에서는 턱관절 디스크원판을 양측에서 잡아주는 내외측 익돌근의 문제가 가장 많은 영향을 미치고 있다. 특히 내측 익돌근의 긴장 및 수축이 디스크 원판을 내측으로 빠져나가게 함으로써 하악의 좌우 지그재그 움직임을 야기시키고 턱관절잡음이나 턱통증 및 개구장애를 유발하기 때문이다. 나머지는 저작에 관여하는 근육들이 그 다음으로 영향을 미치는 것으로 예측하고 있다. 그러나 제2형 급성 턱관절장애의 경우는 제1형 급성 턱관절장애가 한단계 더 발전하여 이와 연관된 근육이나 인대의 긴장수축이 오랜 시간 진행되어, 이들이 다시 상부 경추의 아탈구와 두개골의 비정상적 움직임에까지 영향을 미쳐 나타나는 것으로 생각된다. 그렇게 되면 뇌에서 필요 충분한 뇌혈액공급이나 뇌척수액순환의 문제를 일으킬 수 있기 때문이다. 그리고 제1형 만성 턱관절장애의 경우는 제2형 급성 턱관절장애가 좀 더 진행되면서 척추 및 근골격계의 구조변화, 교합 및 턱의 구조변화 그리고 안면구조의 변화에 이르기까지 점점 진행되어 나타나는 것으로 보인다. 따라서 각종 척추 디스크질환, 관절질환을 비롯해서 두개천골계의 순환문제, 부정교합 및 턱 비대칭, 안면 비대칭의 문제를 유발하게 된다고 추정된다. 그러나 두번째 유형의 만성 턱관절장애는, 턱에서 지속적이고 반복적인 그리고 과다한 부정적 자극들이 오랜 기간 누적되면서 턱에 분포된 C 섬유를 비롯한 3차신경의 가소성변화를 유발하면서 결국 중추신경계를 포함하여 전체신경계의 회로망에까지 파급되어 다양한 만성질환 또는 난치성 질환들이 양산되는 것으로 추정하고 있다. 아마도 지금까지 서양의학에서 아직 밝혀내지 못한 대부분의 질병들이 여기에 포함되지 않을까 하는 것이 나의 생각이다.

• The Journal of the Korea Contents Association
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• v.18 no.7
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• pp.628-634
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• 2018

In an examination of the temporomandibular joint disc, MRI(Magnetic Resonance Imaging) is a useful method, and it is necessary to conduct an examination with one's mouth open for a long time to observe the accurate position change of the disc. Thus, this study would produce a TMJ device, using the 3-D printing technology, which would maintain the state of opening the mouth and would evaluate its usefulness as compared to the existing fixed device. As compared to the image using the existing TMJ device, the image taken with the self-produced TMJ device with a 3-D printer showed a somewhat lower SNR, but there was no defect for a clinical use. It is judged that benefits to costs would increase, since it can be customized for the individual patient and can contribute to the production of similar tools by utilizing the 3-D printing technology.

• Journal of Dental Rehabilitation and Applied Science
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• v.23 no.1
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• pp.1-10
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• 2007

악관절 잡음과 동통,과두 흡수를 동반한 퇴행성 측두하악장애는 교합 불안정과 개구장애 를 동반하기도 한다. 진단을 위해 CT나 MRI를 이용해 과두 형태 및 디스크 위치를 파악하 는 것이 유용한 접근법이다. 퇴행성 측두하악관절 환자는 CT나 MRI를 이용하여 진단하고, 과두-원판 재위치와 근 기능 개선을 위해 장기간 교합 안정장치 사용이 필요하므로 교정치료 기간에 변형된 교합 안정장치의 병용이 필요하다. 이에 본 연구에서 교합 안정장치를 병용하여 교합 재구성 증례를 CT나 MRI로 고찰해 보고자 한다.

• Journal of Dental Rehabilitation and Applied Science
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• v.30 no.2
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• pp.159-169
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• 2014

Panfacial fractures require complex multidisciplinary approaches for treatment. Functional stability of bilateral condylar-disc complex should be the goal of the treatment. A patient with complex clinical panfacial fractures, including a bilateral condylar fractures visited our clinic. Facial asymmetry, insufficient vertical space and multiple missing teeth of the patient were major problems. Closed reduction and splint treatment were tried for stable condylar position. A functional and esthetic rehabilitation was accomplished by using implants and full mouth rehabilitaion. Potential possibilities of unstable occlusion should be prevented with night guard and periodic occlusal adjustment.

• Journal of Dental Rehabilitation and Applied Science
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• v.32 no.1
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• pp.16-23
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• 2016

Purpose: The aim of this study was to evaluate whether fluorides at various pH cause changes in the surface roughness of titanium implants that alter the adherence of bacterial biofilms. Materials and Methods: The titanium disks were assigned randomly to the following seven groups according to the fluoride agents and application time (1 minute or 30 minute) used: control (no treatment); group 1 (1.23% acidulated phosphate fluoride [APF] at pH 3.5 for 1 minute); group 2 (1.23% APF at pH 3.5 for 30 minute); group 3 (1.23% APF at pH 4.0 for 1 minute); group 4 (1.23% APF at pH 4.0 for 30 minute); group 5 (2% NaF gel at pH 7.0 for 1 minute); group 6 (2% NaF gel at pH 7.0 for 30 minute). The surface roughness of the titanium disks and the amount of adherent bacteria were measured. Results: Group 2 showed a significantly greater surface roughness than the control group (P < 0.0001). No significant differences in the amount of surface bacteria were observed between the treated samples and the controls. In addition, there were no significant differences in bacterial adherence relative to the incubation period between the treated samples and the controls. Conclusion: The surface roughness of the titanium disks was significantly greater after treatment with APF at pH 3.5 for 30 min compared with that of the controls. In addition, we found that the amount of Porphyromonas gingivalis, Fusobacterium nucleatum, and Aggregatibactor actinomycetemcomitans was similar among all groups

• Journal of Dental Rehabilitation and Applied Science
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• v.25 no.2
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• pp.183-190
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• 2009

The aim of this study is to find the condition of forming the favorable nanotubes by anodizing with NaF and $H_3PO_4$. Machined Ti discs were used for anode, and Platinum net was used for cathode. For electrolyte, $H_3PO_4$ and NaF solution were mixed. We controlled voltage, electrolyte concentration, anodizing time and formed nanotubes on Ti discs. After that, these were washed with distilled water for 24 hours and dried in the $40^{\circ}C$ oven for 24 hours. The surface structure of specimens were analyzed. The results were as follows : At 0.5 wt % NaF, according as increasing voltage and anodizing time, early state of nucleating pores were generated. At 1.0 wt % NaF, 20 V, 20 & 25 min, well-formed nanotubes were observed. At 1.0 wt % NaF, 30 V, structure of nanotube became bigger and interconnected. At 2.0 wt % NaF, no nanotubes were formed and it was unrelated with voltage and time. At 1.0 wt % NaF, 20 V, 20 - 25 min, well-ordered nanotubes were generated on Ti discs. For the formation of favorable nanotubes, it is considered that proper parameters such as electrolyte concentration, voltage, anodizing time are necessary according to the kind of electrolytes.

• Journal of Dental Rehabilitation and Applied Science
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• v.31 no.1
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• pp.20-25
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• 2015

Purpose: This study was evaluated the shade of feldspathic porcelain with various concentration of silver ion. Materials and Methods: The control group was conventional feldspathic porcelain with no silver ion, the experimental groups were the feldpathic porcelain with 5%, 10%, 20%, 30% silver ion. The number of specimens on the each group was 5. Commission Internationale de I'Eclairage (CIE) $L^*a^*b^*$ parameters were recorded twice for each specimen with a spectrophotometer (Model CM-2600d, Minolta, Japan). One-way Anova was used for statistical analysis. Results: L value was similar. a value was increasing and b value was decreasing with silver ion statistically significantly. ${\Delta}E$ was increasing according to silver ion significantly. Conclusion: The shade of feldspahtic porcelain was influenced by silver ion. Ag ion under 10% concentration is acceptable clinically.

• Journal of Dental Rehabilitation and Applied Science
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• v.37 no.1
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• pp.23-30
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• 2021

Purpose: The aim of this study was to investigate effect of zirconia on osseointegration and Surface appearance by surface treatments using various acid solution. Materials and Methods: The prepared zirconia disks were treated with hydrofluoric acid solution and photo-assisted etching under various condition. The surface was analyzed by SEM and the surface roughness was analyzed by using surface profiler. The osteogenic effect of MC3T3-E1 cells was assessed via fluorescent staining observation and reverse transcriptase-polymerase chain reaction (RT-PCR). Results: Various roughness were obtained according to the surface treatment method. The surface roughness increased in the group treated with hydrofluoric acid solution, but that had week network structure. In the method using photo-assisted etching, the surface roughness increased in micro units. Cell reaction showed better results in the photo-assisted etching group than in the hydrofluoric acid-treated group (P < 0.05). And it showed even osteoblastic cell distribution in photo-assisted etching group. Conclusion: As a result, the photo-assisted etching method is more effective than the simple acid solution treatment for zirconia treatment for osseointegration.

• Journal of Dental Rehabilitation and Applied Science
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• v.35 no.3
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• pp.160-169
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• 2019

Purpose: The purpose of this study was to evaluate the antimicrobial effects of a toothbrush with light-emitting diodes (LEDs) on periodontitis-associated dental biofilm attached to a zirconia surface by static and dynamic methods. Materials and Methods: Zirconia disks (12 mm diameter, 2.5 mm thickness) were inserted into a 24-well plate (static method) or inside a Center for Disease Control and Prevention (CDC) biofilm reactor (dynamic method) to form dental biofilms using Streptococcus gordonii and Fusobacterium nucleatum. The disks with biofilm were subdivided into five treatment groups-control, commercial photodynamic therapy (PDT), toothbrush alone (B), brush with LED (BL), and brush with LED+erythrosine (BLE). After treatment, the disks were agitated to detach the bacteria, and the resulting solutions were spread directly on selective agar. The number of viable bacteria and percentage of bacterial reduction were determined from colony counts. Scanning electron microscopy (SEM) was performed to visualize alterations in bacterial morphology. Results: No significant difference in biofilm formation was observed between dynamic and static methods. A significant difference was observed in the number of viable bacteria between the control and all experimental groups (P < 0.05). The percentage of bacterial reduction in the BLE group was significantly higher than in the other treated groups (P < 0.05). SEM revealed damaged bacterial cell walls in the PDT, BL, and BLE groups, but intact cell walls in the control and B groups. Conclusion: The findings suggest that an LED toothbrush with erythrosine is more effective than other treatments in reducing the viability of periodontitis-associated bacteria attached to zirconia in vitro.

• Journal of Dental Rehabilitation and Applied Science
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• v.33 no.3
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• pp.178-188
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• 2017

Purpose: We compared the effects of newly developed diode laser (Bison 808 nm Diode laser) on the treatment of peri-implantitis with conventional products (Picasso 810 nm Diode laser) by comparing the surface temperature of titanium disc and bacterial sterilization according to laser power. Materials and Methods: The titanium disc was irradiated for 60 seconds and 1 - 2.5 W using diode laser 808 nm and 810 nm. The surface temperature of the titanium disc was measured using a temperature measurement module and a temperature measurement program. In addition, in order to investigate the sterilizing effect according to the laser power, 808 nm laser was irradiated after application of bacteria to sandblasted large-grit acid-etched (SLA) and resorbable blast media (RBM) coated titanium discs. The irradiated disks were examined with scanning electron microscopy. Results: Both 808 nm and 810 nm lasers increased disk surface temperature as the power increased. When the 810 nm was irradiated under all conditions, the initial temperature rise rate, the descending rate, and the temperature change before and after was higher than that of 808 nm. Disk surface changes were not observed on both lasers at all conditions. Bacteria were irradiated with 808 nm, and the bactericidal effect was increased as the power increased. Conclusion: When applying these diode lasers to the treatment of peri-implantitis, 808 nm which have a bactericidal effect with less temperature fluctuation in the same power conditions would be considered safer. However, in order to apply a laser treatment in the dental clinical field, various safety and reliability should be secured.