Digital dental photography

Photography has always been an integral part of dentistry. The journey goes back to the time when film photography was used only for documentation and referral purpose which has now evolved to digital photography. Its application in dental practice is simple, fast, and extremely useful in documenting procedures of work, education of patients, and pursuing clinical investigations, thus providing many benefits to the dentists and patients. The article describes the added benefits of digital dental photography over film photography, basic armamentarium for obtaining good photographs, and how digital dental photography is beneficial in the field of prosthodontics.

Investigation of anterior teeth color of Uygur youth aged15-20years in the Kashi area of Xinjiang Uygur Autonomous Region / 口腔疾病防治

Objective @# To study the distribution range of the color values of the upper anterior teeth of Uygur youth in the Kashi area of XinJiang as a reference for clinical applications.@*Methods@#Based on the International Commission on Illumination (CIE) L*a*b* color system, the colorimetric values of the anterior teeth of 212 Uygur youths in Xinjiang, Kashi, were analyzed by digital camera colorimetry. There were 105 males and 107 females. The length of the neck to the cutting end of the tooth was measured, and the tooth was evenly divided into thirds. To determine the chromaticity values of the incisors, lateral incisors, cuspids, and middle teeth, 1/3 of the cervical, middle and incisal regions and 9 test areas were measured. @*Results @#The color of the cervical, middle and incisal regions of the same tooth position in Uygur youth in the Kashi area showed the following trends: L* value: middle regions > cervical regions > incisal regions; a* value: cervical regions > incisal regions > middle regions; b* value: cervical regions > middle regions > incisal regions, and the differences were statistically significant (P < 0.05). The value of L* gradually decreased, and the value of a* gradually increased (P < 0.05). There were no significant differences in the a* value of male and female maxillary anterior teeth (P > 0.05). However, there was a significant difference in the b* value between the middle teeth and the incisors, the middle and the incisal regions of the upper maxillary incisors, and the cutting end of the upper maxillary incisors (P < 0.05). @*Conclusions @# There was a significant difference in the color of the cervical, middle and incisal of the same tooth. The upper jaw gradually reduced from the incisors to the sharp teeth, and the color gradually became reddish. The maxillary central incisor was brighter in males than in females, and the middle and incisal regions of the maxillary front teeth were more yellow than in males than in females.

Beyond photography: Evaluation of the consumer digital camera to identify strabismus and anisometropia by analyzing the Bruckner's reflex.

Amblyopia screening is often either costly or laborious. We evaluated the Canon Powershot TX1 (CPTX1) digital camera as an efficient screener for amblyogenic risk factors (ARF). We included 138 subjects: 84‑amblyopes and 54‑normal. With the red‑eye‑reduction feature off, we obtained Bruckner reflex photographs of different sized crescents which suggested anisometropia, while asymmetrical brightness indicated strabismus; symmetry implied normalcy. Eight sets of randomly arranged 138 photographs were made. After training, 8 personnel, marked each as normal or abnormal. Of the 84 amblyopes, 42 were strabismus alone (SA), 36 had anisometropia alone (AA) while six were mixed amblyopes (MA). Overall mean sensitivity for amblyopes was 0.86 (95% CI: 0.83‑0.89) and specificity 0.85 (95% CI: 0.77‑0.93). Sub‑group analyses on SA, AA and MA returned sensitivities of 0.86, 0.89 and 0.69, while specificities were 0.85 for all three. Overall Cohen’s Kappa was 0.66 (95% CI: 0.62‑0.71). The CPTX1 appears to be a feasible option to screen for ARF, although results need to be validated on appropriate age groups.

Capture of histopathological images by medical students using the digital cameras of cell phones and smart phones during histopathology classes / 医学教育

Background: New methods are needed to assist medical students with active learning during histopathology classes. The built–in digital cameras of cell phones and smart phones have recently been used to capture histopathological images during histopathology classes. We examined how the use of the cameras affected students’ attitudes to classwork.<br>Method: The students were encouraged to capture histopathological images with the digital cameras of cell phones and smart phones. We observed and recorded changes in their learning attitude.<br>Result: The students captured many histopathological images with their digital cameras. They discussed the pathology of the diseases with their instructors while viewing captured images on the phones’ screens. Some students sorted the image files and used them for self–study after class.<br>Conclusion: Active learning is encouraged by allowing medical students to record histopathological images with the built–in digital cameras of cell phones and smart phones during histopathology classes.

Principles and practice of external digital photography in ophthalmology.

It is mandatory to incorporate clinical photography in an ophthalmic practice. Patient photographs are routinely used in teaching, presentations, documenting surgical outcomes and marketing. Standardized clinical photographs are part of an armamentarium for any ophthalmologist interested in enhancing his or her practice. Unfortunately, many clinicians still avoid taking patient photographs for want of basic knowledge or inclination. The ubiquitous presence of the digital camera and digital technology has made it extremely easy and affordable to take high-quality images. It is not compulsory to employ a professional photographer or invest in expensive equipment any longer for this purpose. Any ophthalmologist should be able to take clinical photographs in his/her office settings with minimal technical skill. The purpose of this article is to provide an ophthalmic surgeon with guidelines to achieve standardized photographic views for specific procedures, to achieve consistency, to help in pre-operative planning and to produce accurate pre-operative and post-operative comparisons, which will aid in self-improvement, patient education, medicolegal documentation and publications. This review also discusses editing, storage, patient consent, medicolegal issues and importance of maintenance of patient confidentiality.

Optimization of Exposure Condition and Photographic Techniques for Specimen and Devices in Neuroangiographic Suites / 신경중재치료의학

PURPOSE: We analyzed factors related to quality of photographs taken at neuroangiographic suites to optimize exposure condition. MATERIALS AND METHODS: We used a camera (EOS-300D, Canon Inc., Tokyo) with a standard- (EF-S 18-55 mm F3.5-5.6 USM, Canon Inc., Tokyo) and a macro-lens (EF 100 mm f/2.8 Macro USM, Canon Inc., Tokyo). Photographs were taken at a light-booth (1000 lux) and 2 neuroangiographic suites (988 and 856 lux) under ordinary intensity of illumination. We took photographs of a test chart (ColorChecker, X-rite, Michigan) and Kodak Q-13 Grey Scale Card at different values of aperture and shutter speed with fixed ISO of 400 and assessed the quality of photographs by Blade Pro (V1.1, Image group, Seoul). We analyzed photographs of a device at 1/25-1/80 shutter speed and F12 - 20 apertures and compared the result and also made visual assessment. RESULTS: Photographs of test chart and Grey Scale Card revealed that the best images chosen by Blade Pro were distributed in scattered range of quality which could help understand the range of optimum exposure condition but was not suitable for practical usage. We obtained reasonable quality photograph at shutter speed of 1/40 and aperture of F16 that can be used in 3 places. CONCLUSION: The most appropriate exposure condition when taking photographs in neuroangiographic suites could be explored. To get an optimal image in limited illumination, it is mandatory to select a fast enough shutter speed to avoid motion artifacts and a sufficient aperture to actualize the subject depth.

A study of measurement of facial skin color using digital camera / 实用口腔医学杂志

Objective; To evaluate the reliability and reasonability of maxillofacial skin color match using the digital camera. Methods; The stability of the experimental light source was evaluated before establishing the color measurement. 122 volunteers aged from 22 to 32 years were recorded by a Canon EOS 20D digital camera in studio environment when the light source was stable. Photographs were taken under a set exposure parameters(f/4.5,1/25 s,custom white balance,ISO 800) and saved as JPEG format. The CIE L~* a~* b~* color values were obtained from the digital images using Adobe Photoshop7.0 after color correction. All data were analyzed using SPSS 10. 0. Results;The experimental light source was stable in 21 to 70 minutes. It was suitable for color measurement during this period. The color parameters of all tested maxillofacial skin were:L~*49～66,a~*7 - 18,b~*5 -22. Conclusion;The assessment of maxillofacial skin color depend on method of measurement and instrument. The method of maxillofacial skin color matching by digital camera seems reliable.

The Contrast of Pupil Constrict Response to the Pilocarpine Between the Young and the Old / 医学研究杂志

Objective Observe the pupil constrict response to the pilocarpin,identify the difference of the response between the young and the old.Methods Use the infrared digital camera of sonyF717 to record the dynamic variety of the pupil constrict response to the 1%pilocarpine liposome and the pilocarpine liquid in dark environment.Then deliver the data to the computer,measure the data by imagetool software,analysis the data by the Sigamastat software.Results In darkness,the pupil diameter of the young is equally 6.8?0.643mm,the old is equally 4.4?0.447mm.T test t=16.1,P

Objectification of Tongue Diagnosis with a Compact Digital Camera-Photographing Standard and Repeatability- / 日本東洋医学雑誌

In order to maintain objective tongue diagnosis, we have researched a photographic standard and the repeatability of tongue photography, using a Compact Digital Camera (i. e. digital camera).<br>We photographed the tongues of subjects who held a small color chart on the end of a chopstick.<br>We were able to reduce the level of reflected camera flash when the camera was held vertically by its upper grip, in such a way that camera flash came from the subjects' upper left. We examined various focal distances, and white balance (W. B.) settings in the camera's Close-up Mode, and obtained well-adjusted photographs with minimal reflection when the focal distance was about 10cm, and the camera's W. B. was set to Flash Mode. Photographs taken under these conditions were highly consistent regardless of place, time, and who the subject or photographer were. We report this photographic standard as recommended for objective tongue photography.

Quality Improvement of Dermatologic Care with the Digital Camera System: Improvement of Efficiency of Dermatologic Care and Cost Reduction / 대한피부과학회지

BACKGROUND: Photographic imaging is a valuable tool in Dermatology. Analog cameras have been used for many years for documenting such images. However, with the recent introduction of the digital camera, dermatologists have begun to replace analog images for digital images when recording dermatologic and histologic findings. We employed a continuous quality improvement (CQI) activity to achieve this goal to replace the image recording system. METHODS: A CQI team composed of all the department members was formed to begin digitalization, Problems caused during digitalization were discussed during monthly meetings. RESULT: 1. We could achieve improvements of image management efficacy. 2. There was a reduction of management space. 3. There was a reduction of costs seen in the total expenses of preparing photographic documentation. CONCLUSION: After digitalization of clinical and histological dermatologic imaging, we were able to reduce expenses, use storage spaces more efficiently, and reduce production time. When considering the efficiency of hospital management, these results are very encouraging, and it can be stated that these results are a good outcome of CQI activities.

Digital imaging of film-based cephalograms using a digital camera / 대한치과교정학회지

As computer programs for cephalometric analysis were developed in diagnosis & treatment planning, digital imaging of film-based cephalograms came to be needed. When a digital camera is used, a problem encountered is the image distortion produced according to the focal length, which causes errors in indentifying landmarks. In addition, changes in the image size and compression ratio will inevitably produce a low quality image, causing errors in identifying landmarks. Hence, we have found the focal length producing the least image distortion when digital imaging the film-based cephalograms and the minimal digital camera setting which helps to identify the correct landmarks using the COOLPIX4500 digital camera (Nikon, Japan). The results were as follows: The image distortion was minimized at a focal length of 16.4mm (79.4mm when converted into a 35mm film camera) when digital imaging the film-based cephalograms. When wide imaging, with a focal length of under 16.4mm, barrel distortion was found and when tele imaging, with a focal length of over 16.4mm, pincushion distortion was found. The minimal digital camera setting was 2272 X 1704 pixel at normal (1/8) compression from which we can identify the correct landmarks at the same level as tracing the film-based cephalograms manually. As a result, when digital imaging the film-based cephalograms, using a COOLPIX4500 digital camera (Nikon, Japan), the focal length should be 16.4mm, the pixel image size over 2272 X 1704, and the compression ratio over normal (1/8).

Manufacture of the Serially Sectioned Images of the Whole Body (Second Report: Photographing and Processing of the Anatomical Images) / 대한해부학회지

Serially sectioned images (MR, CT, and anatomical images) of the whole body are helpful in anatomy education because three dimensional images can be reconstructed with the serially sectioned images, and then the three dimensional images can be sectioned and rotated. To make the most important anatomical images of serially sectioned images, sectioned surfaces should be inputted into the personal computer after serial sectioning of the cadaver's whole body. In this study, equipments (digital camera and strobes) and techniques for inputting the sectioned surfaces into the personal computer to make anatomical images and for processing the anatomical images have been developed. By using these equipments and techniques, the anatomical images with the actual feature of the sectioned surfaces, the right alignment, and the constant brightness could be made. These anatomical images will be the basis for making good three dimensional images which are helpful in anatomy education.

Study of reliability of tooth color measuring by digital photographic system / 实用口腔医学杂志

Objective:To investigate the reliability of tooth color-measuring by using digital cameras.Methods: 3D-Master shade guide system was measured by Canon EOS D60,CRAIC QDI2000 micropectrophotometer and ShadeEye-NCC directly.The data collected from the three methods were analyzed statistically to evaluate the reliability of the data measured by digital cameras.Results:There was no significant difference between the data measured by digital cameras and ShadeEye-NCC statistically;while that existed between the parameters of L* collected by digital cameras and microspectrophotometer were obviously co-related(P

Computer analysis of the color in ShoFu colormeter plate / 实用口腔医学杂志

Objective: To study the color in ShoFu colormeter plate. Methods: The values of color degree of the cervical, body and incisal end of various teeth in the ShoFu colormeter plate were measured by digital camera and analyzed by computer using CIE1976L*a*b* system and JISZ8722 standard. Results: In ShoFu plate the brightness in the cervical, body and incisal end of various teeth changed following a certain rule, the brightness in group R and VR were higher than that in group A. While the values of color degree in other groups changed without any rule. Conclusion: The digital camera and computer may be used in dental color study.