• The Journal of Korea Assosiation for Disability and Oral Health
• /
• v.6 no.1
• /
• pp.10-14
• /
• 2010

Vitamin D-resistant rickets(VDRR) is hereditary disease manifesting marked hypophosphatemia caused by renal tubular loss of phosphate into urine and an associated decrease in the calcium and phosphorous ion product. VDRR is identified by clinical symptoms, such as in the limbs, gait disturbance, dwarfism, familial occurrence, bowlegs, and knock-knees, as well as by laboratory findings. Dental findings are enlarged chambers and extension of the pulp horns into the cusp tips in both the primary and the permanent dentition in contrast to the vitamin D-deficient rickets. The major oral manifestations are multiple spontaneous abscesses in a caries-free dentition. We reported the clinical features and treatment of a 6-year-old boy with vitamin D-resistant rickets referred to the department of pediatric dentistry in Kyung Hee University for multiple spontaneous periapical abscesses and gingival fistula without severe dental caries.

• The Journal of Korea Assosiation for Disability and Oral Health
• /
• v.13 no.1
• /
• pp.14-18
• /
• 2017

X-linked dominant hypophosphataemic rickets(XLHR) is a hereditary disease generally transmitted as an X-linked dominant trait. Oral manifestations include poorly mineralized dentin, enlarged pulp chambers and root canals, early tooth loss. Also, spontaneous dental abscesses could occur in the absence of a history of trauma or caries. This report describes the clinical finding and dental treatment of a child, who came to the hospital for treatment caries but was refered to pediatrics because the child showed clinically short of status, bow-leg and radiographically enlarged pulp chamber and canal, there as diagnosed as XLHR. After the diagnosis, 13 years follow-up and treatment were performed.

• Geophysics and Geophysical Exploration
• /
• v.13 no.2
• /
• pp.144-152
• /
• 2010

To study the thickness variation of volcanic rocks of Jeju Island, microtremor data were recorded at eight and four sites using short-period and broadband seismometers, respectively, for 30 ~ 60 minutes with a 100 Hz sampling rate. During the daytime, these records show increased cultural noise at frequencies above 1.8 Hz. Natural noise occurs in the frequency range of 0.4 to 0.8 Hz in both daytime and nighttime data. Predominant frequencies determined by the H/V spectral-ratio method are in the range of 0.2 ~ 0.7 Hz. These frequencies decrease gradually as the central part of the Mt. Halla is approached. This may indicate that the basement is warped downward beneath the center of the island, which is consistent with previous gravimetric and magnetic models. Assuming an average shear-wave velocity of 1,800 m/s for the overburden basalts, the depths to basement are estimated to be between 640 and 2,140 m.