Joo Heung Lee

The mechanical properties of enamel and dentin were studied using test specimens having the same shape and dimensions because these properties might vary with the experimental conditions and specimen shapes and dimensions. Healthy human teeth were used as specimens for mechanical tests. The stress (MPa), strain (%), and elastic modulus (E, MPa) of the specimens were obtained from compression tests. The maximum stresses of the enamel, dentin, and enamel-dentin specimens were 62.2 ± 23.8, 193.7 ±

Atopic dermatitis (AD), with the prevalence rate of around 10 to 15%, is characterized by an intensely pruritic skin lesions with typical distribution and morphology. Recently, AD is divided into extrinsic type (ADe) and intrinsic type (ADi) according to the laboratory findings and associated diseases. ADe is well-known for high IgE level, positive response to food- or aero-allergens, whereas ADi has clinically similar skin lesions and distribution patterns of AD with normal serum IgE levels, ne

BACKGROUND: In vitiligo, the melanocyte of the hair follicle is one of the major sources for repigmentation. Segmental vitiligo seems to be often associated with white hairs. However, in the case of small vellus hairs, it is often difficult or impossible to detect hair color. Thus, the real incidence of leukotrichia in segmental vitiligo has not been known. MATERIALS AND METHODS: In this study, we investigated the existence of white hairs in the lesional skin of 82 patients with segmental vitili

Background: A good acne grading system should reflect epidemiological and clinical features of a particular patient group. Current Korean acne grading systems are mostly based on the skin colors, epidemiology, and clinical features of Western countries, which make them less than being ideal for Korean acne patients. Objective: We tried to devise an acne grading system based on clinical and epidemiological characteristics of Korean acne patients. This system is intended for use in primary care se

Childhood granulomatous periorificial dermatitis (CGPD) is a disease presenting most commonly in prepubertal children as yellow-brown papules limited to the perioral, perinasal and periocular regions. The condition is benign, self-limiting and is not associated with systemic involvement. We herein report a case of an 11-year-old Korean boy with multiple, asymptomatic, monomorphic, red-to-yellow-colored papular eruptions on the perioral areas of 7-month duration. Histopathological examination rev

Background: Psoriasis is an immune-mediated, chronic inflammatory disease affecting multiple aspects of patients’ lives. Its epidemiology varies regionally; however, nationwide epidemiologic data on psoriasis depicting profile of Korean patients has not been available to date. Objective: To understand nationwide epidemiologic characteristics and clinical features of adult patients with psoriasis visited university hospitals in Korea. Methods: This multicenter, non-interventional, cross-sectional

Segmental vitiligo (SV) is usually characterized by a unilateral-dermatomal distribution, earlier onset and rapid progression followed by stabilization. The response to phototherapy in patients with SV is limited. We evaluated the treatment response in 39 cases of SV according to disease duration. Ten cases (50.0%) of Group 1 (duration ≤ 5 months) and five cases (26.3%) of Group 2 (duration > 5 months) showed more than 50% repigmentation. Contrary to previous reports, patients in our study respo

This study was registered on July 7, 2009 at ClinicalTrials.gov, NCT00936065 .