A retrospective study of the dental implants placed in the controlled diabetes mellitus patients / 대한치주과학회지

PURPOSE: The aim of the present study was to analyze 7-year cumulative survival rate (CSR, %) of dental implants in the controlled diabetic patients and to evaluate the influence of the position, diameter and length of fixture, bone quality, age, gender and the method of maxillary sinus elevation on the survival rate. METHODS: The data of 342 placed implants in the 104 diabetic patients collected between 1995 and 2007 at the Department of Periodontology in Yonsei University Hospital were analyzed. RESULTS: Seven-year CSR of the 342 dental implants in the 104 controlled diabetic patients was 96.5%. The survival rates of the placed implants according the position have no statistically significant difference. The survival rates according to the length or diameter of the fixtures have no statistically significant difference. The survival rates according to the bone quality were 100% (Type I), 97.1% (Type II), 97.7% (Type III) and 85.7%(Type IV). The difference between the survival rate of Type I, II and III and that of Type IV was statistically significant. The survival rates according to patient gender were 96.8% (male), 95.5% (female). The survival rates according to patient age were 100% ( or = 60). The survival rates according to the method of sinus elevation in the maxillary posterior area were 96.8% (without sinus elevation), 92.9% (lateral approach) and 89.8% (crestal approach). CONCLUSIONS: Dental implants can be used successfully in the controlled diabetic patients. In case of upper posterior region which has poor bone density and older patients, the implant treatment should be more properly planed, executed, and followed-up.

Histometrical evaluation of biphasic calcium phosphate in surgically created 1-wall periodontal intrabony defects in dogs / 대한치주과학회지

PURPOSE: The aim of this study was to evaluated biphasic calcium phosphate applied in surgically created 1-wall periodontal intrabony defects in dogs by histometrical analysis. MATERIAL AND METHOD: Critical sized(4 mm x 4 mm), one wall periodontal intrabony defects were surgically produced at the proximal aspect of mandibular premolars in either right and left jaw quadrants in four canines. The control group was treated with debridement alone, and experimental group was treated with debridement and biphasic calcium phosphate application. The healing processes were histologically and histometrically observed after 8 weeks. RESULTS: In biphasic calcium phosphate group, more new bone and cementum formation, less epithelium and connective tissue attachment were observed compared to other groups. But there was no statistical significance. CONCLUSION: Though the statistically significant difference could not be found, it seemed that there was more new bone and cementum formation with applying biphasic calcium phosphate in 1 wall intrabony defects in dogs by preventing junctional epithelium migration.

Clinical and radiographic evaluation of Neoplant(R) implant with a sandblasted and acid-etched surface and external connection / 대한치과보철학회지

STATEMENT OF PROBLEM: Since the concept of osseointegration in dental implants was introduced by Branemark et al, high long-term success rates have been achieved. Though the use of dental implants have increased dramatically, there are few studies on domestic implants with clinical and objective long-term data. PURPOSE: The aim of this retrospective study was to provide long-term data on the Neoplant(R) implant, which features a sandblasted and acid-etched surface and external connection. MATERIAL AND METHODS: 96 Neoplant(R) implants placed in 25 patients in Yonsei University Hospital were examined to determine the effect of the factors on marginal bone loss, through clinical and radiographic results during 18 to 57 month period. Results: 1. Out of a total of 96 implants placed in 25 patients, two fixtures were lost, resulting in 97.9% of cumulative survival rate. 2. Throughout the study period, the survival rates were 96.8% in the maxilla and 98.5% in the mandible. The survival rates were 97.6% in the posterior regions and 100% in the anterior regions. 3. The mean bone loss for the first year after prosthesis placement and the mean annual bone loss after the first year for men were significantly higher than that of women (P<0.05). 4. The group of partial edentulism with no posterior teeth distal to the implant prosthesis showed significantly more bone loss compared to the group of partial edentulism with presence of posterior teeth distal to the implant prosthesis in terms of mean bone loss for the first year and after the first year (P<0.05). 5. The mean annual bone loss after the first year was more pronounced in posterior regions compared to anterior regions (P<0.05). 6. No significant difference in marginal bone loss was found in the following factors: jaws, type of prostheses, type of opposing dentition, and submerged /non-submerged implants (P<0.05). CONCLUSION: On the basis of these results, the factors influencing marginal bone loss were gender, type of edentulism, and location in the arch, while the factors such as arch, type of prostheses, type of opposing dentition, submerged / non- submerged implants had no significant effect on bone loss. In the present study, the cumulative survival rate of the Neoplant(R) implant with a sandblasted and acid-etched surface was 97.9% up to a maximum 57-month period. Further long-term investigations for this type of implant system and evaluation of other various domestic implant systems are needed in future studies.

Changes in the Lung after Pulmonary Hypertension Induced by Obstruction of the Pulmonary Vein in Rats / 대한흉부외과학회지

BACKGROUND: Experimental studies of vascular remodeling in the pulmonary arteries have been performed actively. These models required a persistent vascular insult for intimal injury induced by chronic hypoxia, monocrotaline intoxication or chronic air embolism and characterized medial hypertrophy and neointimal formation by active synthesis of the extracellular matrix protein. The purpose of this study was to determine the pattern of pulmonary vascular remodeling after obstruction of the pulmonary vein. MATERIAL AND METHOD: Obstruction of the right pulmonary vein with a metal clip was performed in Sprague-Dawley rats (352+/-18 g, n=10) to cause pulmonary vascular disease. Fifteen days later, experimental studies were done and finally the both lungs and hearts were extirpated for experimental measurement. Pulmonary arterial pressure, weight ratio of right ventricle (RV) to left ventricle (LV) and ventricular septum (S) (RV/LV+S weight ratio), and pulmonary artery morphology (percent wall thickness, %WT) were evaluated and compared with normal control groups. RESULT: Pulmonary hypertension (38+/-12 mmHg vs 13+/-4 mmHg; p<0.05) and right ventricular hypertrophy (right ventricular/left ventricular and septal weight ratio, 0.52+/-0.07 vs 0.35+/-0.04; p<0.05) with hypertrophy of the muscular layer of the pulmonary arterial wall (percent wall thickness, 22.4+/-6.7% vs 6.7+/-3.4%; p<0.05) were developed by 15 days after obstruction of the pulmonary vein. CONCLUSION: Obstruction of the pulmonary vein developed elevation of pulmonary blood pressure and medial hypertrophy of the pulmonary artery. These results are a part of the characteristic vascular remodeling. Theses results demonstrate that obstruction of the pulmonary vein can develope not only high pulmoanry blood flow of contralateral lung but also intima injury inducing vascular remodeling.

Efficacy of Aquacell(R) Dressing in Partial Thickness Burn Patients

In partial thickness burn injuries, silver sulfadiazine cream 1%(SSD, Silvadene(R)) is the most commonly used topical agent worldwide. But silver sulfadiazine cream 1% has no exudate absorption property. Usually after escar is removed from wound surface, Silvadene(R) is changed to saline wet gauze dressing to promote epithelization. Aquacel(R)(ConvaTec, UK) is a 100% sodium carboxymethylcellulose Hydrofiber material. It absorbs exudates directly into the hydrofibers by vertical wicking which allows rapid uptake of liquid into the fibers. The absorbed exudate fluid can be distributed to the entire dressing rather than just over the wound surface, which results in larger fluid absorption capacity. From April, 2003 to July, 2004 a study was done with 40 patients who had variable partial thickness burns. Aquacel(R) dressing was compared in 21 cases to silver sulfadiazine cream 1% and saline wet gauze dressings in 19 cases. In the Aquacel(R) cases, the average healing time on the face was 5.36+/-1.69 a day; on the hands was 8.46+/-2.15 a day; and, on the neck was 6.0+/-2.0 a day. With the Silvadene(R) and Saline wet gauze dressing, the average healing time on the face was 6.44+/-1.74 a day; on the hands was 13.79+/-5.35 a day; and, on the neck was 11.17+/-3.31 a day. As a result, the Aquacel(R) group showed a shorter healing time compared to the Silvadene(R) and saline wet gauze dressing group and patients were satisfied because of less pain and improved comfort. In conclusion, Aquacel(R) is a better choice for partial thickness burn injuries because of shorter healing time, less pain and more confortable dressing.

Histologic findings of three-wall intrabony defects around dental implants using different grafting materials in beagle dogs / 대한치주과학회지

No abstract available.

Pilomatricoma: Case Report

Pilomatricoma is a rare benign neoplasm arising from hair follicular matrix cells and exhibiting slow growth. The radiologic features of this neoplasm have rarely been described in the literature; in particular, the ultrasonographic findings have not been published in Korea. We report a case of pilomatricoma presenting as a well-marginated soft tissue mass with calcification in the dermis and with overlying bullous skin, a rare clinical variant.

Reconstruction of the Tissue Defects of Extremities with Anterolateral Thigh Free Flap

For the reconstruction of various tissue defects, free tissue transfer has been a very popular method in recent years. A large thin flap is required for aesthetic and functional resurfacing of the extremity defects. As a result, anterolateral thigh free flap has been thought to be useful in reconstructing soft tissue defects requiring thin flap coverage of extremities. The anterolateral thigh flap is a septocutaneous flap based on the septocutaneous or musculocutaneous perforators of the lateral femoral circumflex system. It supplies a large area of skin on the anterolateral aspect of the thigh. The advantages of this flap are safe elevation, a long vascular pedicle, and large caliber vessel. The donor scar is inconspicuous and it could also be used in a sensated flap. From September 1996 to December 1997, 16 cases of soft tissue defect on extremities were resurfaced with anterolateral thigh free flap and the outcomes were satisfactory. This flap is considered useful in one-stage reconstruction of large soft tissue defects of extremities.

Abnormalities of Serum Lipid, Lipoprotein and Apolipoprotein in Both Normotriglyceridemic and Hypertriglyceridemic Patients with Chronic Renal Failure on Chronic Hemodialysis / 대한임상병리학회지

BACKGROUND: Hypertriglyceridemia (HTG) has been considered a characteristic plasma lipid abnormality in hemodialysis patients with chronic renal failure, but is actually shown in only some of them (30-50%). Also renal dyslipidemia may contribute to atherosclerosis in hemodialysis patients. METHODS: Study population consisted of 34 patients with normotriglyceridemia (NTG), 11 patients with HTG and 47 controls. We measured total cholesterol (TC), triglyceride (TG), high density lipoprotein-cholesterol (HDL-C), apolipoprotein (apo) A-I, apoB, apoC-III and apoE. RESULTS: Compared with controls, the NTG patients had significantly decreased levels of TC, HDL-C, and low density lipoprotein-cholesterol (LDL-C). But HTG patients had significantly increased TG, and TC/HDL-C ratio which were considered to represent the atherogenic indicator and had decreased HDL-C and LDL-C (P <0.001), with significant increase of TG and TC/HDL-C ratio compared with those of NTG patients. In the apolipoprotein profiles, all patients showed decreased levels of apoA-I, apoB, and apoA-I/apoC-III ratio and increased levels of apoC-III and apoC-III/apoE ratio compared with those of controls (P <0.001). Especially, HTG patients had significantly increased levels of apoC-III compared with NTG patients. CONCLUSIONS: So these results indicated that abnormalities of those potentially atherogenic lipid and lipoproteins may contribute to the high incidence of cardiovascular diseases and progression of renal disease in the HTG patients than NTG patients on maintenance hemodialysis.

Cinical Application of the Free Flap Based on the Musculocutantaneous Perforators of the Thoracodorsal Vessels

The latissimus dorsi muscle or musculocutaneous flap is one of the most useful flaps in reconstructive surgery. This flap has many advantages, such as its reliable anatomy, long pedicle with large caliber vessels, minimal functional deficit of the donor site, and low incidence of donor site complications. However, the bulkiness of the flap has been considered a disadvantage, so various modifications of technique have been devised. The cutaneous portion of the flap can be safely elevated based on the cutaneous perforating branch of the thoracodorsal vessel. From March 1997 to February 1998, 10 patients underwent reconstructive procedures with thoracodorsal perforator-based free flaps. The composition of the flaps varied in accordance with the nature of the defect. The variances in the flaps were as follows; 3 were cutaneous, 6 musculocutaneous, and 1 osteomusculocutaneous including the rib. All flaps survived with good contour. We concluded that this thin and reliable flap was useful for reconstruction of various defects, and that the composition of the flap, such as subcutaneous, muscle and bone, gave it considerable flexibility as needed.

Microvessel Density and Expression of p53 Protein in Skin Carcinoma: basal and squamous cell carcinoma

Basal cell carcinoma(BCC) and squamous cell carcinoma (SCC) are very prevalent neoplasms of the human skin. Ultraviolet radiation in sunlight is a well-established mutagen of the p53 gene and is one of basal cell carcinoma and squamous cell carcinoma. The newly-formed vascular network is important for neoplasms to grow beyond a size of about 1 mm2. Recent reports have suggested the hypothesis that a mutant p53 protein is closely related with capillary density. Immumohistochemistry for p53 protein and CD34 was performed in 20 cases of BCCs and 14 SCCs to evaluated the relationship between p53 protein and capillary density. The results were as follows:1. The microvessels stained by CD34 were mainly located in the interface of tumor cells and stroma. 2. There was no difference in the microvessel density according to the histologic types and age of the patients, but a higher microvessel density was noted in male patients. 3. The aggressive BCCs and the less-differentiated SCCs showed higher p53 immunostaining. 4. The mean microvessel density of cases showing strong positive immunostaining of the p53 gene(54.73+/-17.75) was higher than that of others(39.75+/-18.30). These results suggested that p53 protein expression and microvessel density are not related to the histologic types and age of the patients, but that differentiation and biologic behavior such as the infiltrating property of tumors and the microvessel density are closely related to p53 protein expression.