ABSTRACT
Purpose@#This study aimed to examine the impact of fear and perception of infection risk on depression among service workers during prolonged Covid-19 service, and to provide basic data on the impact of COVID-19 prevention on the psychological health of service workers. @*Methods@#Data were collected from workers nationwide from May 24 to 31, 2021. The data were analyzed using the t-test, ANOVA, Scheffé test, Pearson’s correlation coefficient, and multiple regression analysis, using SPSS 28. @*Results@#It was found that 44.3% of the participants experienced depression (PHQ-9 total scores ≥ 10) during the Covid-19 pandemic. The general characteristics of service workers that made a difference in the level of depression were health status, smoking, and perception of infection risk. @*Conclusion@#Social support from institutions is needed to treat depression caused by Covid-19 among workers in the service sector.
ABSTRACT
The purpose of this investigation was to evaluate the relationship between the hydration time of demineralized freeze-dried bone (DFDB) and early new bone formation in rat calvarial defects filled with DFDB. Rats (n = 43) were divided into 4 experimental groups. Standard, transosseous circular defects of the calvaria were made midparietally. In experimental group 1, the defect was grafted immediately after soaking the DFDB. In experimental group 2, the defects were grafted with DFDB after soaking the DFDB for 10 minutes. In experimental groups 3 and 4, the defects were filled after soaking the DFDB for 30 and 60 minutes, respectively. Graft sites were analyzed histologically after healing periods of 1, 2, or 4 weeks. Each group showed similar bone regeneration at each time point by histological analysis. The results of this study were as follows: 1. After 1 week, a significant amount of inflammation, granulation tissue, and edema were found. A small amount of bone was seen, but the amount of bone did not differ between groups. 2. After 2 weeks, a small amount of new bone formation and DFDB resorption were observed. 3. After 4 weeks, a greater amount of new bone formation was observed. The greatest amount of bone formation occurred in experimental group 4 after 4 weeks. We conclude that the hydration time of DFDB does not affect new bone formation and that it is very important to control inflammation in bone grafting.
Subject(s)
Animals , Rats , Bone Regeneration , Bone Transplantation , Edema , Granulation Tissue , Inflammation , Osteogenesis , Skull , TransplantsABSTRACT
Subject(s)
Humans , Bone Substitutes , Intercellular Signaling Peptides and Proteins , Platelet-Rich Plasma , TransplantsABSTRACT
Subject(s)
Humans , Male , Middle Aged , Acinar Cells , Biopsy , Carcinoma, Acinar Cell , Diagnosis , Maxillary Sinus , Odontogenic Tumors , RecurrenceABSTRACT
Subject(s)
Humans , Male , Young Adult , Epithelium , Hyperplasia , Lymphangiectasis , Lymphangioma , Lymphatic Vessels , Molar, Third , Salivary Glands , Salivary Glands, Minor , Tooth ExtractionABSTRACT
Subject(s)
Aged , Female , Humans , Carcinoma, Mucoepidermoid , Cystadenocarcinoma, Papillary , Cystadenoma , Diagnosis, Differential , Follow-Up Studies , Recurrence , Salivary Glands , Salivary Glands, Minor , TongueABSTRACT
Subject(s)
Female , Humans , Male , Age Distribution , Anti-Bacterial Agents , Dental Caries , Hypertension , Incidence , Metronidazole , Penicillins , Periapical Abscess , PericoronitisABSTRACT
Subject(s)
Aged , Female , Humans , Biopsy , Carcinoma , Cranial Fossa, Anterior , Diagnosis , Drug Therapy , Maxilla , Nasal Cavity , Orbit , Paranasal Sinuses , Prognosis , Radicular Cyst , Radiotherapy , Survival Rate , UlcerABSTRACT
Subject(s)
Adult , Female , Humans , Ameloblastoma , Curettage , Mandible , Mouth , Odontogenic Tumors , Prognosis , RecurrenceABSTRACT
Polymethylmethacrylate(PMMA) is currently commonly used material for the reconstruction of bone defects and fixation of joint prosthetics following congenital and acquired causes. Although PMMA has widespread use, it does not possess the ideal mechanical characteristics with osteoconductivity and osteoinductivity required. In order to overcome these problem, addition of bovine bone drived defatting demineralized bone (BDB) powders to a PMMA bone cement was done for improvement of physical property and bone forming characteristics of composite. In order to investigate the influence of BDB reinforcement on the PMMA, we measured physical property of compressive, tensile, flexural strength, and scanning electron microscopic examinations. The results were obtained as follows : 1. The PMMA forms a solid cellular matrix with open cells about above 100micrometer in variable size and incorporating BDB. BDB aggregates inside the cells form a porous network that is accessible from the outer surface. 2. The physical properties were compressive strength of mean 22.74+/-1.69MPa, tensile strength of mean 22.74+/-1.69MPa, flexural strength of mean 77.53+/-6.93MPa. Scanning electron microscopic examinations were revealed that there was DBD particles form a highly porous agglomerates. BDB can be added PMMA in the form of dried powders, the composites are applicable as bone substitutes. BDB and PMMA mixture is shown to produce a class of composites that due to their microstructure and improved mechanical properties may be suitable for application as bone substitutes. The mechanical and material properties of the BDB-PMMA bone substitute composites are competitive with those properties of a porous ceramic matrix of other hydroxyapatite and with those of natural bones.
Subject(s)
Bone Substitutes , Ceramics , Compressive Strength , Durapatite , Joints , Polymethyl Methacrylate , Powders , Tensile StrengthABSTRACT
Subject(s)
Centrifugation , Platelet-Derived Growth Factor , Platelet-Rich Plasma , Retrospective Studies , Transforming Growth Factor beta , TransplantsABSTRACT
No abstract available.
ABSTRACT
No abstract available.