ISSN : 0376-4672
Digital photography is a very useful recording and communication method for both dentists and dental technicians. Intraoral photography can be influenced by a variety of factors. Among them, the digital camera’s white balance setting and interference of external lighting can greatly affect the intraoral photography. The purpose of this study was to analyze the effect of color temperature of ambient light and white balance of digital camera on intraoral digital photography. The maxillary central incisor made of composite resin was used as an intraoral photographic model. In the first experiment, color measurement was performed by changing the ambient light color temperature to 3500°K, 4000°K, 4500°K, 5000°K, 5500°K, and 6000°K. The white balance of the camera was set to 3570°K, 4550°K, and 5500°K, respectively. CIE L*a*b* values of buccal surface region were recorded. ΔE values were obtained by comparing the CIE L*a*b* values obtained in each group. In the second experiment, CIE L*a*b* values were obtained by changing the white balance to 4000°K, 4550°K, 5000°K, and 5500°K in the intraoral photography model. At this time, the color temperature of the ambient light was fixed at 5500°K. ΔE values between each group were obtained in the same way. As a result of the experiment, digital photographs did not show visually perceptible ΔE values for the changing in ambient light color temperature. This was the same for all white balance groups. When the camera’s white balance setting was changed, the ΔE value was more than 3.7, which is a visually perceptible change. In conclusion, digital photographs were more affected by digital camera’s white balance setting than the color temperature of ambient light.
The mini-screw is widely used in orthodontic treatment for anchorage reinforcement. In mild skeletal Class III patient, retraction of mandibular dentition using mini-screw has been accepted as a reliable and stable treatment approach. In addition, the mini-screw placed in the retromolar area could be used for the uprighting of the lower molar. However, the placement of the mini-screw on the retromolar trigone or anterior ramus region need to be careful because of the possible risk of the “slippage” or “displacement”. Once the mini-screw is displaced to the fascial space such as pterygomandibular space, submandibular space or lateral pharyngeal space, it is difficult to remove. In this case report, we present a mini-screw removal case via an intraoral approach that was displaced into the pterygomandibular space while placing the orthodontic mini-screw on the anterior margin of mandibular ramus.
치주질환으로 손상된 치간유두의 재생은 아주 도전적인 과제이다. 지금까지 많은 치과의사들이 훌륭한 수술적인 방법을 고안하여 소개하였다. 지금까지 소개된 술식들을 순서대로 비교해보고 장단점을 비교해 치간유두를 재생을 위한 최적의 방법을 고안해보았다. 치주수술만으로 해결하기 어려운 좁은 치간유두 사이의 공간을 부분교정치료를 통하여 공간을 일시적으로 만들어 주는 것이 치은이식을 위해 큰 도움이 되었다. 치은이식은 마이크로 블레이드를 이용하여 박리를 시행하고 치은경계부에서 떨어진 수직절개를 하나만 시행해 여기를 통해 추가적인 박리와 이식편을 넣어서 치은이식을 시행하였다. 이렇게 교정치료를 동반하여 좁은 치간유두 사이의 폭을 벌려서 치은이식이 더 용이한 상태로 만들어 치은이식을 진행하고, 치은이 성숙한 뒤 교정력으로 다시 치아사이를 모아주는 술식(ELSA technique)을 통해 치간유두 재생을 할 수 있었다.
Regeneration of interdental papilla damaged by periodontal disease has been a very challenging task. Up until now, many dentists have devised and introduced great surgical methods. When I compared the pros. and cons. of these many methods, I came up with the best way to regenerate interdental papilla. Temporarily creating space between narrow interdental papilla, which could not be solved by periodontal surgery alone, was a great help for connective tissue graft (CTG). The CTG was performed using a microblade, and only one vertical incision was required from the gingival margin. The graft was then performed by inserting the grafts through this incision. Along with the orthodontic treatment, the area between the narrow interdental papilla was widened, which made it easier to carry out the CTG. After a period of maintenance, I was able to bring the teeth together again using orthodontic force and regenerate the interdental papilla. I named this method the ELSA (Enlargement of space - Labial graft - Squeezing - for Augmentation of papilla) technique.
One of the main goals of restorative treatment is to establish a physiological periodontal environment and promote periodontal health maintenance. Crown contours affect periodontal health. Loe in 1965 and Socransky in 1970 showed that bacterial plaque was a direct cause of periodontal disease. O'leary in 1970 and Perel in 1971 demonstrated experimentally that crown contours can also affect gingival health. Several theories about crown contours came before it was found that dental plaques are the direct cause of gum disease and, therefore, are mostly hypothetical or simple opinions. Unfortunately, when discussing the shape of the prosthesis, there are still arguments that have no rationale (or weak), such as shape to obtain gum support or shape that becomes self-cleansing. I hope that readers would understand Crown contours better through a review of the dental literature.
