Finite element analysis of the effects of mouthguard produced by combination of layers of different materials on teeth and jaw / 대한치과보철학회지

PURPOSE: The purpose of this study was to compare the stress distribution of teeth and jaw on load by differentiating property of materials according to each layer of widely used mouthguard. MATERIALS AND METHODS: A Korean adult having normal cranium and mandible was selected to examine. A customized mouthguard was constructed by use of DRUFOMAT plate and DRUFOMAT-TE/-SQ of Dreve Co. according to Signature Mouthguard system. The cranium was scanned by means of computed tomography with 1mm interval. It was modeled with CANTIBio BIONIX/Body Builder program and simulated and interpreted using Alter HyperMesh program. The mouthguard was classified as follows according to the layers. (1) soft guard (Bioplast)(SG) (2) hard guard (Duran)(HG) (3) medium guard (Drufomat)(MG) (4) soft layer + hard layer (SG + HG) (5) hard layer + soft layer (HG + SG) (6) soft layer + hard layer + soft layer (SG + HG + SG) (7) hard layer + soft layer + hard layer (HG + SG + HG) The impact locations on mandible were gnathion, the center of inferior border, and the anterior edge of gonial angle. And the impact directions were oblique (45degrees). The impact load was 800 N for 0.1 sec. The stress distribution was measured at maxillary teeth, TMJ and maxilla. The statistics were conducted using Repeated ANOVA and in case of difference, Duncan test was used as post analysis. RESULTS: In teeth and maxilla, the mouthguard contacting soft layer of mandibular teeth presented lowest stress measure and, in contrast, in condyle, the mouthguard contacting hard layer of mandibular teeth presented lowest stress measure. CONCLUSION: For all impact directions, soft layer + hard layer + soft layer, the mouthguard with three layers which the hard layer is sandwiched between two soft layers, showed relatively even distribution of stress in impact.

Effects of Laughter Therapy on Postpartum Fatigue and Stress Responses of Postpartum Women

PURPOSE: The purpose of this study was to examine the effects of laughter therapy on postpartum fatigue and stress respon-ses of postpartum women. METHODS: The research design was a nonequivalent control group non-synchronized design. The participants were 67 postpartum women who agreed to participate in this study, selected by convenience sampling: (experiment group-33 and control group-34). The data were collected from August 5 to September 30, 2010. The experimental group received laughter therapy from a laughter therapy expert for 60 min, twice a week for 2 weeks, a total of 4 sessions. To evaluate the effects of laughter therapy, postpartum fatigue by self-report questionnaire and cortisol concentration in breast milk were measured. The data were analyzed using the SPSS WIN 13.0 Program. RESULTS: The first hypothesis that "the degree of postpartum fatigue in the experimental group participating in laughter therapy would be lower than that of the control group" was accepted. These findings indicate that laughter therapy has a positive effect on decreasing postpartum fatigue. CONCLUSION: The finding provides evidence for use of complementary and alternative nursing in Sanhujori facilities and obstetric units to reduce postpartum women's fatigue.

A Case of Non-islet Cell Tumor Hypoglycemia / 대한내분비학회지

Mesenchymal tumors including hemangiopericytomas, hepatocellular tumors, adrenal carcinomas, and a variety of other large tumors have been reported to produce excessive amounts of insulin-like growth factor (IGF) type II precursor, which binds weakly to insulin receptors and strongly to IGF-I receptors, leading to insulin like actions. In addition to increased IGF-II production, IGF-II bioavailability is increased due to complex alterations in circulating binding proteins. The authors of this article diagnosed non-islet cell tumor hypoglycemia from an 81-year-old male patient suffering from repetitive fasting hypoglycemia while he has not received any treatment for pulmonary hemangiopericytoma diagnosed in the past. Moreover, this topic is getting reported as the authors have experienced a significant improvement of catamnesis by a treatment with glucocorticoid.

Effects of Cognitive-Behavioral Group Therapy for Adolescents' Behavioral Problems: Focused on Violent Behaviors / 신경정신의학

OBJECTIVES: The purpose of this study was to examine the effect of cognitive-behavioral group therapy on improving adolescents' behavioral problems, especially violent behavior. METHOD: The subjects were 27 middle school students referred by their teachers for behavioral problems. We devided them into 4 teams and treated them for 15 sessions of cognitive-behavioral group therapy. The control group were 20 middle school students who had no cognitive-behavioral therapy. We assessed their behaviors pre- and post intervention by two series of scale, ie. self ratings and teacher ratings. Self ratings included 'misbehavior scales' and 'violent behavior subscale'; teacher ratings included 'teacher-children rating scale' and 'detection of misbehavior scale'. RESULT: 1)In self-rating scales, the misbehavior of the subject group decreased more than the coltrol group, but not the violent scale. There were statistically significant group differences of improving effect in misbehavior scales. 2)In teacher rating scales, there was no significant decrease in the behavioral problems of the subject group. 3)By teams there were significant different intervention effects among 4 teams in self rating misbehavior scale. Team 2 improved on all scales except teacher-rating detection of misbehavior scale. 4)Determinant factors of intervention effect on behavioral problems were the degree of baseline behavioral problems, sex of subjects and therapist. CONCLUSION: The results from this study suggest that cognitive-behavioral group therapy was effective in decreasing the behavioral problems of adolescents. But the effect of therapy depends on sex, the degree of behavioral problems of subjects and the therapist.