Retrospective study on survival and complication rates of posterior single implant according to the implant diameters, lengths and position / 대한치과보철학회지

Purpose@#. This retrospective study was to investigate the survival and complication rates of posterior single implant according to the implant diameters, lengths and position. @*Materials and methods@#. Patients who had been restored single implant prosthesis in the posterior area by the three prosthodontists in the department of prosthodontics, Daejeon dental hospital of Wonkwang university, in the period from February 2014 to May 2018 were selected for the study. A total of 505 patients with 697 implants were observed. The survival and complications of implants were investigated using electronic medical records and radiographs. Fixture diameters, lengths, position, patient’s sex and age were assessed as possible factor affecting the survival and complications of implants. @*Results@#. 3-year cumulative survival rates of posterior single implants were 98.5% and 5-year cumulative survival rates were 94.4%. 5-year cumulative survival rates were higher in implants with diameter > 4.0 mm (97.0%) than implants with diameter ≤ 4.0 mm (89.5%), and in females (98.8%) than males (92.4%). There were statistically significant differences (P 4.0 mm than implants with diameter ≤ 4.0 mm and in females than males. Abutment screw loosening which was the most commonly occurring complication occurred more frequently in the lower molar region, in males than females, and in patients aged < 65 years than patients aged ≥ 65 years. There were statistically significant differences.

The survey on foreign body ingestion and aspiration during the dental prosthetic treatment

Purpose@#This study was to investigate the dentists’ experience and awareness of foreign body ingestion and aspiration during dental prosthetic treatment. @*Materials and Methods@#A survey of 157 dentists working at 108 dental institutions in Daejeon and Chungcheong provinces was carried out and frequency analysis was conducted. Chi-square test was conducted to find out the difference between the sociodemographic data and experience of foreign body ingestion and aspiration of patients and independent sample t-test was conducted to find out the difference in awareness depending on whether receiving related education. @*Results@#The percentage of dentists experiencing dropping foreign body into patients’ oral cavity was 99.4% and the percentage of dentists experiencing foreign body ingestion and aspiration of patients was 53.5%. There were more dentists who experienced foreign body ingestion and aspiration of patients in male than female, longer working career, and general practitioners than specialists (P < .05). 50.3% of the respondents received related education. When they receive related education, they had low degree of concern, high confidence in coping with situations, and low willingness to receive education in the future (P < .05). @*Conclusion@#The percentage of foreign body dropping was 16% higher in prosthetic treatment than general treatment. The percentage of dentists with experience of foreign body ingestion and aspiration of patients was 53.5%. Among them, 92.9% experienced foreign body ingestion of patients and 7.1% of them experienced foreign body aspiration of patients.

Comparative study of flexural strength of temporary restorative resin according to surface polishing and fabrication methods

The purpose of this study is to investigate the effect of surface polishing and fabrication method on the flexural strength of temporary restorative resin. Materials and Methods: Each of four fabrication methods was used to make 30 temporary restorative resin specimens and the specimens were divided into two groups depending on whether they were polished by mechanical polishing. Specimens were stored in 37°C thermostat for 24 hours. Flexural strength was measured using a universal testing machine (UTM). The data obtained through the experiment were analyzed with Two-way ANOVA, Tukey’s HSD test and Paired t-test. Results: CAD/CAM milling group showed the highest flexural strength regardless of surface polishing. In decreasing order, the flexural strength of the other fabrication method group was as follows SLA 3D printing, DLP 3D printing, and Conventional method group. Conclusion: Surface polishing did not affect flexural strength of the temporary restorative resin (P > 0.05). However, there were statistically significant differences in flexural strength depending on fabrication method (P < 0.05).

Epidermotropic Metastasis from Lung Adenocarcinoma / 대한피부과학회지

Cancer metastasis to the skin, especially epidermotropic metastasis, is uncommon. Sometimes it is difficult to find the primary lesion; immunohistochemical (IHC) staining of cutaneous metastasis is used to determine the origin, but diagnosis may occasionally prove difficult. A 77-year-old man visited our hospital with a 1-month diagnostic history of multiple nodules in the right axilla. The patient had undergone surgery for gastric adenocarcinoma (T3N3M0) 21 years ago, and was diagnosed with lung adenocarcinoma 1 year previously; however, no treatment was ongoing. Biopsy of the lesions revealed atypical cells surrounding the papillary projections of the epidermis and tumor nests of the upper dermis. IHC staining was positive for CK7 and CEA and negative for CK5/6, CK20, napsin A, TTF-1, GCDFP 15, and p63. The tissues revealed glandular structures and tested negative for p63 and CK5/6 on IHC staining. The patient was diagnosed with epidermotropic metastasis of lung adenocarcinoma.

Prevalence and Clinical Features of Non-alcoholic Fatty Liver Disease in Psoriatic Patients with Abnormal Liver Function Tests / 대한피부과학회지

Background@#Non-alcoholic fatty liver disease (NAFLD) is the most frequent liver disease. Evidence supporting a strong relationship between psoriasis and NAFLD exists. NAFLD is significantly higher in psoriatic patients than in matched controls and psoriatic patients with NAFLD have more severe forms of psoriasis than those without NAFLD. @*Objective@#To evaluate the prevalence and clinical features of NAFLD among Korean psoriatic patients with abnormal liver function tests. @*Methods@#We evaluated the laboratory results of psoriatic patients who visited the Department of Dermatology, National Medical Center, between September 2012 and June 2017. Those who had abnormal liver function tests were consulted by a hepatologist to confirm the diagnosis of NAFLD using ultrasonography. @*Results@#A total of 307 psoriatic patients underwent liver function tests (LFTs), and 46 patients (15.0%) had abnormal LFT values. A hepatologist consulted psoriatic patients with abnormal LFTs, and hepatic ultrasonography was performed; 34 patients (73.9%) were diagnosed with NAFLD. Among psoriatic patients with abnormal LFTs, those with a Psoriasis Area and Severity Index (PASI) ≥10 had a significantly higher rate of NAFLD than psoriatic patients with PASI ＜10 (87.5% vs 59.1%). @*Conclusion@#Among psoriatic patients with abnormal LFTs, 34 patients (73.9%) were diagnosed with NAFLD.Psoriatic patients with PASI ≥10 had a significantly higher rate of NAFLD than those with PASI ＜10.

Prevalence and Clinical Features of Non-alcoholic Fatty Liver Disease in Psoriatic Patients with Abnormal Liver Function Tests / 대한피부과학회지

Background@#Non-alcoholic fatty liver disease (NAFLD) is the most frequent liver disease. Evidence supporting a strong relationship between psoriasis and NAFLD exists. NAFLD is significantly higher in psoriatic patients than in matched controls and psoriatic patients with NAFLD have more severe forms of psoriasis than those without NAFLD. @*Objective@#To evaluate the prevalence and clinical features of NAFLD among Korean psoriatic patients with abnormal liver function tests. @*Methods@#We evaluated the laboratory results of psoriatic patients who visited the Department of Dermatology, National Medical Center, between September 2012 and June 2017. Those who had abnormal liver function tests were consulted by a hepatologist to confirm the diagnosis of NAFLD using ultrasonography. @*Results@#A total of 307 psoriatic patients underwent liver function tests (LFTs), and 46 patients (15.0%) had abnormal LFT values. A hepatologist consulted psoriatic patients with abnormal LFTs, and hepatic ultrasonography was performed; 34 patients (73.9%) were diagnosed with NAFLD. Among psoriatic patients with abnormal LFTs, those with a Psoriasis Area and Severity Index (PASI) ≥10 had a significantly higher rate of NAFLD than psoriatic patients with PASI ＜10 (87.5% vs 59.1%). @*Conclusion@#Among psoriatic patients with abnormal LFTs, 34 patients (73.9%) were diagnosed with NAFLD.Psoriatic patients with PASI ≥10 had a significantly higher rate of NAFLD than those with PASI ＜10.

Skin Disease in Korean Human Immunodeficiency Virus Patient

BACKGROUND: In Korea, new human immunodeficiency virus (HIV) patients continue to be diagnosed. Due to the development of highly active anti-retroviral therapy (HAART) and lengthening of survival period of infected person, the aspect of skin diseases of HIV-infected patients is also changing. OBJECTIVE: To determine skin diseases of HIV-infected patients according to immune status and the relationship between folliculitis and HAART drug. METHODS: Subjects were HIV-infected patients who were treated in the department of dermatology from September 1, 2008 to August 31, 2018. Medical records of 376 subjects were retrospectively analyzed. RESULTS: Of 376 patients were studied, tinea infection, folliculitis, and seborrheic dermatitis were the most common regardless of their CD4 T cell counts or treatment group (initial treatment or retreatment). Seborrheic dermatitis, irritant contact dermatitis, and pruritic papular eruption were significantly more common in patients with CD4+T cells less than 200×106 cells/L while warts were significantly more frequent in patients with CD4+T cells greater than 200×106 cells/L. Most HAART agents were found to be helpful in reducing the incidence of folliculitis. CONCLUSION: There were many skin diseases in HIV patients, different from previous studies. In our study, the top three diagnoses were tinea infection, folliculitis, and seborrheic dermatitis. HAART medication was helpful in reducing folliculitis. These changes will require different treatments for skin diseases in HIV patients.

Investigation on Acne Patients' Use and Awareness of Cosmetics for Acne / 대한피부과학회지

BACKGROUND: Some cosmetics used for treating acne are considered as cosmeceuticals. Consequently, patients with acne are now more likely to perceive such products as actual treatments. OBJECTIVE: We aimed to investigate the awareness and use of cosmetics for acne and to compare them with hospital treatments in terms of efficacy and safety. METHODS: We surveyed patients who presented at the National Medical Center for acne treatment. We collected data on demographics, hospital treatments, kinds of cosmetics for acne, awareness and use of cosmetics for acne, efficacy and adverse effects (cosmetics for acne vs. hospital treatments), and overall patient satisfaction. RESULTS: Of 101 enrolled participants, 94 (mean [SD] age, 25.6 [6.5] years; 59 women) were analyzed. Seventy-one (75.5%) patients used cosmetics for acne. Only 30% perceived that cosmetics for acne were insufficient to treat acne, whereas 45~55% deemed cosmetics for acne as applicable replacements for topical and oral treatments. The participants rated their improvement to be significantly better with hospital treatments than with cosmetics for acne (much improved: 45.1% vs. 2.8%, became worse: 1.4% vs. 8.5%, p<0.01). There were significantly fewer adverse events after hospital treatments than after use of cosmetics for acne. The overall satisfaction scores were significantly higher with hospital treatments than with cosmetics for acne. CONCLUSION: Patients with acne mistakenly believe that cosmetics for acne can replace topical and oral treatments. Dermatologists should disseminate information and educate patients about the proper treatments for acne. Moreover, it is desirable to exclude the word “acne” from the name of cosmeceuticals.

Effect of delayed time, surface treatment, and repair material on shear bond strength of repaired bis-acryl composite resin

PURPOSE: The aim of this study was to evaluate the effect of delayed time, surface treatment, and repair materials on repair of bisacryl composite resin through comparison of shear bond strength and to evaluate the utility of bis-acryl composite resin repair using polymethyl methacrylate resin. MATERIALS AND METHODS: A total of 90 bis-acryl composite resin specimens were fabricated and classified into 9 test groups, each of 10 pieces according to delayed time, surface treatment and repair material. The shear bond strength of each specimen was measured using a universal testing machine immediately after fabrication and analyzed using a statistical analysis program (IBM SPSS statistics 20). After the shear bond strength measurement, the fracture surface of the specimen was observed. RESULTS: The highest shear bond strength (17.54 ± 3.14 MPa) was observed in the experimental group bonded immediately with a light-curing flowable composite resin using a bonding agent. CONCLUSION: When repairing bis-acryl composite resin, it is necessary to consider whether to remake according to the delayed time. For effective repair, it is desirable to consider appropriate materials and surface treatment methods according to the site or purpose of use.

An Outbreak of Scombroid Fish Poisoning Associated with Consumption of Yellowtail Fish in Seoul, Korea

BACKGROUND: In November 2016, an outbreak of scombroid fish poisoning occurred among elementary school students in Seoul, Korea. An epidemiological investigation was conducted to identify the cause and source of the illness. METHODS: A case-control study was conducted among school members who had eaten lunch in the school. The histamine level in the suspect food item (yellowtail steak) was measured. RESULTS: Fifty-five (5.4%) of 1,017 school members who consumed fish for lunch fell ill. The principal symptoms were flushing (100%) and headache (72.7%); the median incubation period was 40 minutes. All had consumed yellowtail steak (odds ratio, 9.24; 95% confidence interval, 1.22–69.91). Leftover steak had an elevated histamine level (293 mg/kg), higher than the allowed 200 mg/kg. CONCLUSION: An outbreak of scombroid fish poisoning was confirmed; this is the first such report in Korea. Detailed food safety guidelines must be established.