No abstract available.
Ear Cartilage* ; Temporomandibular Joint Disc* ; Temporomandibular Joint* ; Transplants*

No abstract available.
Fistula* ; Hemorrhoids* ; Humans

Allogeneic demineralized bone powder has been shown to support the osteogenesis in a variety of bone defect and extra-osseous sites. Previous several experiments have been carried out in animal models which have time-consuming and various problems. Therefore author designed some cytotoxicity tests by using of 5-diphenyl dimethyltetrazolium bromide(MTT) assay, neutral red(NR) assay, lactate dehydrogenase(LDH) activity test, sulforbodamine B (SRB) assay, and alkaline phosphatase(ALP) assay. And these method seemed to be a rapid, repeatable and believable reaction. To establish the osteogenesis capacity of allogeneic bone according to various bone preparation(defatting and demineralization), author studied the effect of allogeneic bone on well-established rat 3T3 fibroblasts and MC3TEl osteoblasts in culture to evaluate a cytotoxicity and examined the surface of allogeneic bone with scanning electron microscopy(SEM) for detecting the porositv. Defatting Demineralized Bone Powder(DDBP0 and Non-Defatting Demineralized Bone Powder(NDDBP) of particle size 212mum were prepared from rat calvarial bone and long bones. 1. Cell counts of rat 3T3 fibroblasts and MC3T3E1 osteoblasts were greater in DDBP enriched medium when compared with medium with NDDBP. Cell counts with DDBP were to different from controls. 2. Author found a little differences in cytotoxicity on 3T3 fibroblast and MC3T3E1 osteoblasts between DDBP and NDDBP with MTT assay, NR assay, LDH activity test, SRB assay, Generally, DDBP was represented less cytotoxicity than NDDBP. 3. ALP assay with MC3T3E1 osteoblasts in culture presented the less cytotoxicity and more crowding around the DDBP than NDDBP. With these findings, defatting procedure on making the demineralized bone powder have a merit for supporting osteogenesis. I should be suggested that cell culture with DDBP and NDDBP is a good method for studying induced osteogenesis.
Animals ; Cell Count ; Cell Culture Techniques ; Crowding ; Fibroblasts ; Lactic Acid ; Models, Animal ; Osteoblasts ; Osteogenesis* ; Particle Size ; Rats ; Transplants*

No abstract available.
Fistula*

No abstract available.

No abstract available.
Colitis, Ulcerative* ; Mesalamine* ; Ulcer*

No abstract available.
Bleomycin* ; Fibroblasts* ; Fluorouracil* ; Humans*

The purpose of this study was to evaluate the relationship between proliferation and cell death during oral carcinogenesis. Syrian golden hamsters which were 3 month old and 90-120 gm-weight were used in this study. The 9, 10-dimethyl-1, 2-benzanthracene(DMBA) in a 0.5% solution in mineral oil was painted on the buccal pouch mucosa 3 times per week in the experimental group during 20 weeks. Control group was painted with mineral oil. In each control and experimental group of 6,8, 10, 12, 14, 16, 18,20 weeks, specimen were sectioned for immunohistochemical study with anti-Proliferating Cell Nuclear Antigen(PCNA), anti-transglutaminase transglutaminase and GST-pi were obtained by counting the positive cells to those antibodies. The following results were obtained. 1. Histopathologically, finding of epithelial dysplasia of the 6 and 8 weeks experimental group and carcinoma in situ in the 12 weeks and squamous cell carcinoma in those of the 14 weeks were seen. 2. PCNA positive cells were mainly mild expressed in the basal cell layer of normal oral mucosa, increased moderately, after 6 weeks. In suprabasal cell layer, control group is negative but retained moderately between 6 weeks and 14 weeks, and decreased after 16 weeks. In spinous cell layer, restricted only between 12 weeks and 16 weeks, other period is mild or negative. 3. PCNA index of experimental group revealed the increased peak in 6 weeks and 20 weeks than control group, and retained between 12 weeks and 18 weeks. All experimental group expressed higher PCNA index than control group(p.<0.05). 4. Tranglutaminase expression was localized in outer and suprabasal layers on control group, but after 6 weeks, expression site moved spinous & suprabasal cell layers, and after 8 weeks, expression is spreaded to basal cell layer, and this patters retained to 20 weeks. Transglutaminase expression of experimental group was higher than control group after 8 weeks. 5. The positive staining of detoxifying agent, G1utathione S-Transferase(GST)pi of experimental group was radually increased from 6 weeks. After 10 weeks, all layer of experimental group was seen positive reaction. The strong positive staining in center of tumor and weak positive staining in periphery of tumor were seen at the stage of squamous cell carcimoma in 14 weeks. According to the results, we should suggest that the more increased proliferation of tumor cell, the more increased expression of PCNA, transglutaminase and GST-pi as a detoxifying agent during carcinogenesis by induced DMBA were seen.
9,10-Dimethyl-1,2-benzanthracene* ; Animals ; Antibodies ; Carcinogenesis* ; Carcinoma in Situ ; Carcinoma, Squamous Cell ; Cell Death ; Cricetinae* ; Humans ; Infant ; Mesocricetus ; Mineral Oil ; Mouth Mucosa ; Mucous Membrane ; Paint ; Proliferating Cell Nuclear Antigen*

No abstract available.
Lasers, Solid-State*

No abstract available.
Lasers, Solid-State*