Recurrent Cervical Spontaneous Spinal Epidural Hematoma with Conservative Management: A Case Report / 대한신경손상학회지

Cervical spontaneous spinal epidural hematoma (CSSEH) is a rare condition that can be potentially fatal if not properly diagnosed and managed. While prompt surgical decompression and evacuation of the hematoma are generally considered as the first line of treatment, mild cases that were managed through observation and conservative treatment have been reported. Our patient was a 24-year-old man who experienced two CSSEH events 8 months apart, both of which were managed conservatively. This was a rare case of recurrent CSSEH in which recovery was achieved without surgical intervention. We believe conservative treatment with close observation may be effective in CSSEH patients presenting with mild neurologic symptoms who have a tendency towards spontaneous neurologic improvement.

Posterior Approach in C2–3 Disc Herniation: C1 Laminectomy, C2–3Laminoplasty and Posterior Fixation in C2–3 Disc Herniation / 대한신경손상학회지

C2–3 disc herniation is rare and a definitive treatment of choice has not been established.The purpose of this case report is to suggest posterior approach as one of the best options.A 49-year-old man visited our clinic with a 7-year history of neck pain and occipital headache and a 2-month history of right arm pain. C2–3 intervertebral disc herniation of the central type was diagnosed on magnetic resonance imaging (MRI), and surgery was performed, including C1 laminectomy, C2–3 laminoplasty, and C2–3 posterior fixation. The posterior approach was used because the patient's neck was difficult to operate anteriorly. After 3 months postoperatively, MRI showed widened cerebrospinal fluid space at the C2–3 level.The visual analogue scale score for pain improved in the occipital area and right arm.However, the untouched protruded central disc, subjective weakness in right hand grasping, and numbness persisted. In conclusion, this case highlights posterior decompression and fixation as a good treatment of choice for decompression at the C2–3 level disc herniation, from where it is difficult to remove compressive lesions directly via the anterior corridor.

Evaluation of color matching ability according to the color temperature and the experience of practitioner / 대한치과보철학회지

PURPOSE: The aim of this study is to investigate the effect of different experience level and different light source on shade selection ability comparing prosthodontist group and dental student group under 4,000 K and 5,500 K light. MATERIALS AND METHODS: After color difference of Vitapan 3D-master shade guides was measured, 3 sets of 5 shade tabs were selected with similar value but have different chroma (set a, b, c). Also 3 sets of 5 shade tabs were selected with similar chroma but have different values (set d, e, f). Under 4,000 K and 5,500 K light sources, ten prosthodontists and ten dental students were allowed to match in one set of 5 tabs the same shade tab with the tab which was originally selected in the other set of 5 tabs. Color differences of original tab and matched tab were measured by spectrophotometer and the shade selection ability was evaluated with those data. Evaluation of color difference value was performed in regard to different light conditions and different level of experience, followed by t-test with 95% confidence interval. RESULTS: Color difference values under 4,000 K and 5,500 K light source were 1.62 +/- 2.0, and 1.33 +/- 1.7 respectively. In addition, color difference values of prosthodontist group and dental student group were 1.34 +/- 1.7, and 1.61 +/- 2.0 respectively. Difference of shade selection ability was not found under either different light sources (P=.398), or different experience level (P=.221). CONCLUSION: Level of experience did not affect on the shade selection ability when prosthodontists and dental students matched the shades with the same shade tab under the same light source.