Statement of problem. Relatively low success rate of root analogue implant system was supposed to be due to the time duration between extraction and implant installation. The use of three-dimensional computer tomography and the reconstruction of objects using rapid prototyping methods would be helpful to shorten this time. Purpose. This aim of this study was to evaluate the application possibility of the 3-dimensional computer tomography and the rapid prototyping to root analogue implants. Material and methods. Ten single rooted teeth were prepared. Width and height of the teeth were measured by the marking points. This was followed by CT scanning, data conversion and rapid prototyping model fabrication. 2 methods were used; fused deposition modelling and stereolithography. Same width and height of this models were measured and compared to the original tooth. Results. Fused deposition modeling showed an enlarged width and reduced height. The stereolithography showed more exact data compared with the fused deposition modelling. Smaller standard deviation were recorded in the stereolithographic method. Overall width error from tooth to rapid prototyping was 7.15% in fused depostion modelling and 0.2% in stereolithography. Overall height showed the tendency of reducing dimensions. Conclusion. From the results of this study, stereolithography seems to be very predictable method of fabricating root analogue implant.
Tomography, X-Ray Computed ; Tooth

No abstract available.

STATEMENT OF PROBLEM: Titanium-Nickel alloy might be used in various prosthetic restorations since it has a unique property such as super-elasticity and high fatigue resistance. However, little is known about the casting ability of this alloy. PURPOSE: This in vitro study compared the casting accuracy and the porosity made with different investments and various sprue designs to ascertain what casting condition would be better for the fabrication of Ti-Ni cast restorations. MATERIAL AND METHODS: A total of 70 Ti-Ni alloy crowns were made and divided into 7 groups of 10 copings on a metal master die. For measuring the effect of the sprue numbers, two groups with one and two 8-gauge sprues were compared. Moreover, the results of the conventional sprue and the double thickness sprues were compared. Three investments were used; carbon free phosphate bonded investment, titanium investment and gypsum bonded investment. The cast restorations were evaluated at 48 points on the entire circumferential margin with a stereomicroscope measuring in micrometers. Each crown was radiographically examined for casting defects and porosity. Data on casting accuracy were analyzed using two-way and Post hoc Scheffe's comparison to determine whether significant differences existed at the 95% confidence level. Student-Newman-Keuls test were performed to identify significant differences in the number of voids. RESULTS: The double sprueing group and double thickness group had significantly less marginal discrepancy than the single sprueing group (P<.05 and P<.01, respectively). The castings with phosphate bonded investment showed the least marginal discrepancy and the smoothest surface. The castings invested in the gypsum bonded investment had the greatest gaps in margin and the largest failure rate. The double sprueing group and phosphate bonded investment group had significantly smaller void numbers and smaller void size than the other groups. CONCLUSION: Within the limitations of this in vitro study, the casting accuracy of the groups using thicker, double sprue design and the phosphate bonded investment was significantly superior. Moreover, void number and size were less than other groups.
Alloys ; Calcium Sulfate ; Carbon ; Celiac Disease ; Crowns ; Fatigue ; Investments ; Porosity* ; Titanium

Hydrocephalus is a common malformation of the central nervous system and its cause may be either congenital or acquired. The imbalance between CSF formation and absorption, obstruction of CSF pathways, impaired venous absorption, and over secretion of CSF results in excessive accumulation of the fluid in the ventricles, leading to hydrocephalus. Although ventriculo-peritoneal shunt is regarded as the main and definitive therapy for rapidly progressive hydrocephalus, shunts in newborns have a high failure rate and thus there have been a search for alternative non-invasive techniques. Acetazolamide is a carbonic anhy- drase inhibitor, which acts by reducing production of CSF in the choroid plexus. Admini- stration of acetazolamide will decrease the rate of CSF production, preventing progressive ventricular enlargement. We experienced three cases of neonatal hydrocephalus successfully treated by long-term administration of acetazolamide. Brief review and related literatures were also presented.
Absorption ; Acetazolamide* ; Carbon ; Central Nervous System ; Choroid Plexus ; Humans ; Hydrocephalus* ; Infant, Newborn ; Ventriculoperitoneal Shunt

No abstract available.

PURPOSE: The purpose of this study was to examine the relationship between ego-states and communication skills in medical students. METHODS: A total of 109 medical school students participated in this study, which used the communication skills self-test papers and the Egogram checklist. The data were analyzed by frequency analysis, and Pearson correlation analysis. RESULTS: Ego-state was related to communication skills. In particular, adapted child ego-state was negatively associated with each sphere of communication skills. CONCLUSION: Our results suggested that ego-state types should be considered in developing a communication skills education program for medical students.
Checklist ; Child ; Education ; Humans ; Schools, Medical ; Students, Medical* ; Transactional Analysis

PURPOSE: Empathy is an important trait of a physician and a key element in the physician-patient relationship. This study evaluated the ability to express empathy in medical students. METHODS: Medical student empathy was measured by the modified Pencil-and-Paper Empathy Rating Test of Winefield and Chur-Hansen. The subjects comprised 110 medical students. The data were analyzed by descriptive analysis and t-test using SPSS version 21.0 (IBM Corp.). RESULTS: Empathy rating test scores were low-level in medical students (mean, 12.59). There were no differences in the level of ability to express empathy between genders (t=-1.714, p=0.089). CONCLUSION: Our results suggest that practical training in expressing empathy should be included in medical education and that an empathy training program must be focused on changes in behavior.
Education ; Education, Medical ; Empathy* ; Humans ; Physician-Patient Relations ; Students, Medical*

PURPOSE: This study investigated trends in family nursing intervention studies and evaluated the quality of studies using the RCT design. METHODS: This study included a total of 898 abstracts published from 1977 to 2007 in order to describe trends in family nursing intervention studies. Out of 898 studies, 153 RCT studies were selected for quality evaluation. The criteria of Jadad et al. (1996) were employed for the quality evaluation. RESULTS: The number of RCT studies on family nursing interventions increased since 2001. Only 6.8% of the studies were published in the area of nursing. Most of the family interventions (27.1%) focused on individual family members and only 8.2% of the studies provided interventions to family as a whole unit. Nine different modes of family nursing intervention could be categorized, but none of the studies used the double blind design. Few studies utilized protocols for interventions. Only 17.5% of the studies reported the rationale for sample size. The mean score was 1.6 out of 5 according to the criteria of Jadad et al. (1996). CONCLUSION: Refined definitions and attributes of family nursing intervention modes are needed. Most of the studies did not meet the expectations of RCT. Thus, it is needed to improve the quality of design. More RCT studies should be conducted to provide evidence-based practice of family nursing interventions.
Evidence-Based Practice ; Family Nursing* ; Humans ; Clinical Trial ; Korea ; Nursing ; Sample Size

STATEMENT OF PROBLEM: Targis/Vectris restorations provide excellent esthetics. Marginal accuracy is significantly influenced by the preparation design. There were no studies to examine the effect of preparation design on the marginal discrepancy and fracture strength of Targis/Vectris crowns. PURPOSE: This study evaluated the marginal accuracy before and after cementation, and the fracture strength of FRC/Ceromer(Targis/Vectris) crowns according to different preparation design. MATERIAL AND METHOD: Three metal dies with different convergence angles(6degrees, 10degrees, 15degrees) were prepared. Total 30 (10 for each angle) Targis/Vectris crowns were made. The restorations were evaluated for adaptation of the margin before and after cementation, then were compressively loaded to failure. Fracture surfaces of the crowns were examined using a SEM. Results. The mean marginal gap was 49micrometer for 6degrees, 55micrometer for 10degreesand 70micrometer for 15degreesand in clinically acceptable level. The mean marginal gap increased significantly after cementation. The increasing amount during cementation was the largest in the 6degrees group. The crowns on 6o convergence angle had a significantly higher fracture strength than the crowns on 15degrees angle. Mean fracture strength of total crowns regardless of convergence angle was 1390 N, which was higher than all-ceramic crowns. SEM observation showed two-mode fracture pattern. CONCLUSION: From the results of this study, all of the FRC/Ceromer crowns had clinically acceptable marginal accuracy and could withstand the bite force. Moreover, less convergent angle than all-ceramic crown might be recommended for preparation procedure.
Bite Force ; Cementation ; Crowns* ; Esthetics

No abstract available.
Myositis Ossificans* ; Myositis*