No abstract available.
Herpes Simplex ; Herpes Zoster ; Humans ; Methylmethacrylates ; Polystyrenes

As a benign adnexal tumor, steatocystoma usually occurs as an autosomal dominant condition known as steatocystoma multiplex. Steatocystoma simplex, the noninherited solitary counterpart of steatocystoma multiplex,was first described by Brownstein in 1982, and is exceedingly rare. We report a case of steatocystoma simplex in a 27-years-old female, who presented with an asymptomatic soft, oval shaped mass on the lower anterior neck. The lesion was completely excised and confirmed as steatocystoma simplex on histopathological examination.
Female ; Humans ; Methylmethacrylates ; Neck ; Polystyrenes ; Steatocystoma Multiplex

No abstract available.
Encephalitis, Herpes Simplex ; Herpes Simplex ; Methylmethacrylates ; Neurosyphilis ; Polystyrenes

Steatocystoma is a benign adnexal tumor originating from the pilosebaceous duct junction which can be classified into two groups (steatocystoma simplex and steatocystoma multiplex). Steatocystoma simplex, which presents as a solitary lesion, is very rare. Steatocystoma simplex occurs most commonly on the face and the case reported herein involving the scalp is extremely rare. A 49-year-old man presented for evaluation and treatment of a solitary papule on the right parietal scalp which had persisted for a period of 1 year. The histopathologic examination revealed a thin-walled cyst consisting of stratified squamous epithelium with hyaline cuticle that lacked a stratum granulosum. Based on clinical and histologic findings, we diagnosed this case as steatocystoma simplex of the scalp and report this rare case.
Epithelium ; Humans ; Hyalin ; Methylmethacrylates ; Middle Aged ; Polystyrenes ; Scalp

STATEMENT OF PROBLEM: Volume stability, microstructure reproducibility and fluidity along with compatibility with dental stone must be in consideration in order to use tissue conditioner as a material for functional impression. There are few studies concerning the influence of time factor in oral condition on surface roughness of the stone and optimal retention period in the oral cavity considering such changes in surface roughness. PURPOSE: The purpose of this study was to find out the influence of various kinds of tissue conditioner, its powder/liquid ratio and immersion time on surface roughness of the stone. MATERIAL AND METHODS: Materials used in this study were the three kinds of tissue conditioners (Coe-Comfort, Visco-Gel, Soft-Liner) and were grouped into three: group R - mixed with standard powder/liquid ratio that was recommended by the manufacturers, group M - mixed with 20% more powder, group L - mixed with 20% less powder. Specimens were made with the size of 20 mm diameter and 2 mm width. Each tissue conditioner specimens were subdivided into 5 groups according to the immersion time (0 hour, 1 day, 3 days, 5 days, 7 days), completely immersed into artificial saliva and were stored under 37degrees C. Specimens of which the given immersion time elapsed were taken out and were poured with improved stone, making the stone specimens. Surface roughness of the stone specimens was measured by a profilometer. RESULTS: Within the limitation of this study, the following results were drawn. 1. Major influencing factor on surface roughness of the stone model made from tissue conditioner was the retention period (contribution ratio (rho) = 62.86%, P < .05) of the tissue conditioner in oral cavity to make functional impression. 2. In case of Coe-Comfort, higher mean surface roughness value of the stone model with statistical significance was observed compared to that of Soft-Liner and Visco-Gel as immersion time changes (P < .05). 3. In case of group L (less), higher mean surface roughness value of the stone model with statistical significance was observed compared to that of R (recommended) and M (more) group as immersion time changes (P < .05). CONCLUSION: We may conclude that as the retention period of time in oral cavity influences surface roughness of the stone model the most and as the kind of tissue conditioner and its P/L ratio may influence also, clinician should well understand the optimal retention period in oral cavity and choose the right tissue conditioner for the functional impression, thus making the functional impression with tissue conditioner usefully.
Immersion ; Methylmethacrylates ; Mouth ; Retention (Psychology) ; Saliva, Artificial ; Time Factors

Squamous cell carcinoma on the lip is a common oral malignancy, and it is responsible for >30% of all oral squamous cell carcinomas. Numerous factors have been implicated in the development of squamous cell carcinoma on the lip, but the most frequently identified risk factors include chronic exposure to ultraviolet radiation. Squamous cell carcinoma on the lip is more prevalent in elderly men, with a male-to-female ratio of 5 : 1. We report an interesting case of squamous cell carcinoma mimicking herpes simplex on the lip in a 35-year-old woman who presented with erythematous grouped vesicles on the upper lip.
Adult ; Aged ; Carcinoma, Squamous Cell ; Female ; Herpes Simplex ; Humans ; Lip ; Male ; Methylmethacrylates ; Polystyrenes ; Risk Factors

STATEMENT OF THE PROBLEM: The cold-cured resins used in fabrication of the provisional crown and fixed partial dentures could cause pulpal damage by heat generated during exothermic polymerization reactions. PURPOSE: In this in vitro study investigates the how external conditions such as material of the matrix, thickness of the matrix and thickness of dentin affect the temperature of the tooth during polymerization reaction of the cold-cured resins. MATERIAL AND METHODS: To measure the temperature of the resin, metal die was maintained to the temperature of 37 degrees C with water bath to simulate the temperature of thetooth and thermocouple was placed in the center of the metal die. Acrylic pipe was cut in height of 1, 2, 3, 6, 10 mm and placed on the metal die and mixed resin was pored in the acrylic pipe. As the resin polymerized temperature was recorded with the thermometer. Temperature of the resin using matrix was recorded by using the individual tray relieved in different thickness 2, 5, 7, 10 mm. The material of the matrix was irreversible hydrocolloid impression material, vinyl polysilloxane impression material and vacuum-formed template. Temperature rise of the resin using different thickness of tooth section was recorded by placing tooth section on the metal die and placing resin over the tooth section. RESULTS: [Table]. CONCLUSION: 1. Temperature rise increased as the thickness of the resin increased but there was no significant differences over 3 mm thickness of the resin. 2. The lowest temperature rise was showed in irreversible hydrocolloid impression material and vinyl polysilloxane impression material, vacuum-formed template as in orders. 3. Temperature rise of the resin decreased regardless of the thickness of the matrix when vinyl polysilloxane impression material was used as the matrix. 4. When irreversible hydrocolloid impressionmaterial was used as matrix, the temperature rise of the resin decreased as the thickness of the matrix increased and there was no temperature rise when thickness of the matrix reached 10 mm. 5. The temperature rise of the resin did not decreased when Polypropylene vacuum-formed template was used as the matrix. 6. The temperature of the resin increased as the thickness of the dentin decreased.
Baths ; Colloids ; Crowns* ; Dentin ; Denture, Partial, Fixed* ; Hot Temperature ; Methylmethacrylates ; Polymerization* ; Polymers* ; Polypropylenes ; Thermometers ; Tooth* ; Water

The most important problem in the transplantation of artificial cornea is the extrusion of keratoprosthesis. So we performed this study to know the conditions to keep the keratoprosthesis as long as possible after animal experiment with experimental keratoprosthesis of various material and structure. We concluded from the results that silicone barrier could not prevent the retroprosthetic membrane, and fluorosilicone was not adequate material as an optic. And the following conditions are required to maintain keratoprosthesis as long as possible; optic made of PMMA, retention plate made of PTFE with 0.6 mm thick, anterior direction of optic, large optic, intralamellar suture technique. Furthermore we postulated that enzymatic theory is more appropriate than aseptic necrosis theory about the extrusion of keratoprosthesis.
Animals ; *Cornea/pathology ; Corneal Transplantation ; Methylmethacrylate ; *Methylmethacrylates ; *Polytetrafluoroethylene ; *Prostheses and Implants ; Prosthesis Design ; Rabbits

BACKGROUND: Poroid neoplasms consist of classic poroma, hidroacanthoma simplex, dermal duct tumor, and poroid hidradenoma. Poroid neoplasms are not rare tumors in dermatology. However, studies of the clinicopathologic characteristics of poroid neoplasms in Korea are very limited. OBJECTIVE: To investigate the clinicopathologic characteristics of poroid neoplasms in Korea. METHODS: The clinicopathologic characteristics of forty three cases of poroid neoplasms were retrospectively analyzed. RESULTS: Poroid neoplasms were diagnosed mostly in the sixth decade, without sex predominance. The most common site was the lower extremities, followed by the head & neck, the trunk, the sole, the palm, and the upper extremities. All cases were observed as a solitary lesion. Papule or nodule shape, verrucous surface, and erythmatous color were most common characteristics of poroid neoplasms. The two cases showed sebaceous differentiation. Some cases showed melanin pigmentations in the lesions or perilesional basal layer. CONCLUSION: Our study will be a resourceful data of poroid neoplasms for dermatologists and pathologists.
Acrospiroma ; Dermatology ; Head ; Korea ; Lower Extremity ; Melanins ; Methylmethacrylates ; Neck ; Pigmentation ; Polystyrenes ; Poroma ; Retrospective Studies ; Upper Extremity

OBJECTIVETo study the effects of two primers on the bond strengths between casting pure titanium and resin cements.

METHODSTwo sizes of specimen were fabricated by casting, which diameter were 4 mm and 5 mm respectively, and then were cut into 3 mm thick titanium discs. The titanium surfaces were polished with silicon carbide sand papers under running water and then treated by sandblasting. The two size of titanium discs were ultrasonic cleaned and treated with Alloy Primer, V-Primer or without primer, and then bonded in pairs with the resin-based cements Super-Bond C&B, Panavia F and Rely X Unicem. The specimens were then stored in distilled water (37 degrees C) for 24 h. Bond strengths were determined before and after 5 000 thermocycling. The titanium surface morphous and failure mode of the teat specimen were observed.

RESULTSThe shear bond strengths of titanium treated by Alloy Primer to Super-Bond C&B were (31.23 +/- 4.86), (34.08 +/- 3.36) MPa before and after 5 000 thermocycling, which higher than that of other combinations of primers and resin cements.

CONCLUSIONBond strengths were influenced by primers, resin cements, and their combinations. The highest bond strengths were the combinations of Alloy Primer and Super-Bond C&B.

Boron Compounds ; Dental Bonding ; Dental Enamel ; Fluorescence ; Methacrylates ; Methylmethacrylates ; Resin Cements ; Thiones ; Titanium ; Triazines