The effects of non-thermal plasma and conventional treatments on the bond strength of fiber posts to resin cement

Maíra do Prado,Eduardo Moreira da Silva,Juliana das Neves Marques,Caroline Brum Gonzalez,Renata Antoun Simão 대한치과보존학회 2017 Restorative Dentistry & Endodontics Vol.42 No.2

This study compared the effect of hexamethyldisiloxane (HMDSO) and ammonia (NH3) plasmas on the bond strength of resin cement to fiber posts with conventional treatments. Materials and Methods: Sixty-five fiber posts were divided into 5 groups: Control (no surface treatment); H2O2 (24% hydrogen peroxide for 1 min); Blasting (blasting with aluminum oxide for 30 sec); NH3 (NH3 plasma treatment for 3 min); HMDSO (HMDSO plasma treatment for 15 min). After the treatments, the Ambar adhesive (FGM Dental Products) was applied to the post surface (n = 10). The fiber post was inserted into a silicon matrix that was filled with the conventional resin cement Allcem Core (FGM). Afterwards, the post/cement specimens were cut into discs and subjected to a push-out bond strength (POBS) test. Additionally, 3 posts in each group were evaluated using scanning electron microscopy. The POBS data were analyzed by one-way analysis of variance and the Tukey’s honest significant difference post hoc test (α = 0.05). Results: The Blasting and NH3 groups showed the highest POBS values. The HMDSO group showed intermediate POBS values, whereas the Control and H2O2 groups showed the lowest POBS values. Conclusion: Blasting and NH3 plasma treatments were associated with stronger bonding of the conventional resin cement Allcem to fiber posts, in a procedure in which the Ambar adhesive was used.

Effectiveness of endodontic retreatment using WaveOne Primary files in reciprocating and rotary motions

Costa Patricia Marton,Leal Renata Maíra de Souza,Yamanari Guilherme Hiroshi,Cavenago Bruno Cavalini,Duarte Marco Antônio Húngaro 대한치과보존학회 2023 Restorative Dentistry & Endodontics Vol.48 No.2

Objectives This study evaluated the efficiency of WaveOne Primary files (Dentsply Sirona) for removing root canal fillings with 2 types of movement: reciprocating (RCP) and continuous counterclockwise rotation (CCR). Materials and Methods Twenty mandibular incisors were prepared with a RCP instrument (25.08) and filled using the Tagger hybrid obturation technique. The teeth were retreated with a WaveOne Primary file and randomly allocated to 2 experimental retreatment groups (n = 10) according to movement type: RCP and CCR. The root canals were emptied of filling material in the first 3 steps of insertion, until reaching the working length. The timing of retreatment and procedure errors were recorded for all samples. The specimens were scanned before and after the retreatment procedure with micro-computed tomography to calculate the percentage and volume (mm3) of the residual filling material. The results were statistically evaluated using paired and independent t-tests, with a significance level set at 5%. Results No significant difference was found in the timing of filling removal between the groups, with a mean of 322 seconds (RCP) and 327 seconds (CCR) (p < 0.05). There were 6 instrument fractures: 1 in a RCP motion file and 5 in continuous rotation files. The volumes of residual filling material were similar (9.94% for RCP and 15.94% for CCR; p > 0.05). Conclusions The WaveOne Primary files used in retreatment performed similarly in both RCP and CCR movements. Neither movement type completely removed the obturation material, but the RCP movement provided greater safety. Objectives This study evaluated the efficiency of WaveOne Primary files (Dentsply Sirona) for removing root canal fillings with 2 types of movement: reciprocating (RCP) and continuous counterclockwise rotation (CCR). Materials and Methods Twenty mandibular incisors were prepared with a RCP instrument (25.08) and filled using the Tagger hybrid obturation technique. The teeth were retreated with a WaveOne Primary file and randomly allocated to 2 experimental retreatment groups (n = 10) according to movement type: RCP and CCR. The root canals were emptied of filling material in the first 3 steps of insertion, until reaching the working length. The timing of retreatment and procedure errors were recorded for all samples. The specimens were scanned before and after the retreatment procedure with micro-computed tomography to calculate the percentage and volume (mm3) of the residual filling material. The results were statistically evaluated using paired and independent t-tests, with a significance level set at 5%. Results No significant difference was found in the timing of filling removal between the groups, with a mean of 322 seconds (RCP) and 327 seconds (CCR) (p < 0.05). There were 6 instrument fractures: 1 in a RCP motion file and 5 in continuous rotation files. The volumes of residual filling material were similar (9.94% for RCP and 15.94% for CCR; p > 0.05). Conclusions The WaveOne Primary files used in retreatment performed similarly in both RCP and CCR movements. Neither movement type completely removed the obturation material, but the RCP movement provided greater safety.

Effects of spinal manipulation and pain education on pain in patients with chronic low back pain: a protocol of randomized sham-controlled trial

Clécio Vier,Marcelo Anderson Bracht,Marcos Lisboa Neves,Maíra Junkes-Cunha,Adair Roberto Soares Santos 한국한의학연구원 2018 Integrative Medicine Research Vol.7 No.3

Background: Low back pain (LBP) has more than doubled in the last 20 years, probably influenced by biopsychosocial factors. Noninvasive treatments have been applied in individuals with chronic nonspecific LBP as spinal manipulation and pain education. However, the neurophysiological effects of these treatments are not clear. The aim of this research is to verify the pain control, functional and neurophysiological effects of spinal manipulation, and pain education in individuals with chronic nonspecific LBP. Methods: This research is an assessor and subject blinded, 2-arm, randomized sham-controlled trial and will be conducted at Governador Celso Ramos Hospital, Florianópolis, Brazil. One hundred and twenty-eight individuals with chronic nonspecific LBP will be recruited for this study. Individuals will be randomly allocated into one of the two groups: (1) spinal manipulation plus pain education or (2) sham treatment plus pain education. Each group will be received two sessions per week over six weeks of treatment. The measures will be applied at baseline, six weeks, and three months after randomization. The primary outcome will be a pain intensity at six weeks postrandomization. Secondary outcomes will be pressure pain threshold, disability, fear and avoidance beliefs, kinesiophobia, risk of poor prognosis, quality of life, and inflammatory biomarkers. Discussion: Evidence has shown that psychosocial factors are more involved in chronic pain than we thought a few years ago. Then, studies investigating both functional and neurophysiological effects of these interventions to evaluate the effectiveness of treatment and what else is happening at the cellular level in nervous system are needed.

The use of auxiliary devices during irrigation to increase the cleaning ability of a chelating agent

Marina Carvalho Prado,Renata Antoun Simão,Fernanda Leal,Heloisa Gusman,Maíra do Prado 대한치과보존학회 2017 Restorative Dentistry & Endodontics Vol.42 No.2

Objectives: This study investigated the cleaning ability of ultrasonically activated irrigation (UAI) and a novel activation system with reciprocating motion (EC, EasyClean, Easy Equipamentos Odontológicos) when used with a relatively new chelating agent (QMix, Dentsply). In addition, the effect of QMix solution when used for a shorter (1 minute) and a longer application time (3 minutes) was investigated. Materials and Methods: Fifty permanent human teeth were prepared with K3 rotary system and 6% sodium hypochlorite. Samples were randomly assigned to five groups (n = 10) according to the final irrigation protocol: G1, negative control (distilled water); G2, positive control (QMix 1 minute); G3, QMix 1 minute/UAI; G4, QMix 1 minute/EC; G5, QMix 3 minutes. Subsequently the teeth were prepared and three photomicrographs were obtained in each root third of root walls, by scanning electron microscopy. Two blinded and pre-calibrated examiners evaluated the images using a four-category scoring system. Data were statistically analyzed using Kruskal-Wallis and Dunn tests (p < 0.05). Results: There were differences among groups (p < 0.05). UAI showed better cleaning ability than EC (p < 0.05). There were improvements when QMix was used with auxiliary devices in comparison with conventional irrigation (p < 0.05). Conventional irrigation for 3 minutes presented significantly better results than its use for 1 minute (p < 0.05). Conclusions: QMix should be used for 1 minute when it is used with UAI, since this final irrigation protocol showed the best performance and also allowed clinical optimization of this procedure.

Anti-visceral Obesity of Apios americana Medikus Powder in Diet-induced Obese Mice

Ra-Yeong Choi,Hyo-Seon Ryu,Da-Eun Song,Ayeong Ma,Ju Ri Ham,Mi-Kyung Lee 한국식품영양과학회 2016 한국식품영양과학회 학술대회발표집 Vol.2016 No.10

Adoption of Information Technology in Nursing Practice

Ma. Beth S. Concepcion,Regin Cabacas,Seung-Won Yang,In-Ho Ra 한국콘텐츠학회 2016 한국콘텐츠학회 ICCC 논문집 Vol.2016 No.12

Chronic dietary ginseng extract administration ameliorates antioxidant and cholinergic systems in the brains of aged mice

Mi Ra Lee,Jin Yeul Ma,Chang Keun Sung 고려인삼학회 2017 Journal of Ginseng Research Vol.41 No.4

Background: Black ginseng has a more potent biological activity than non-steamed ginseng. We investigated the effects of long-term intake of dietary black ginseng extract (BG) on antioxidant activity in aged mice. We also compared the effects of BG on cognitive deficits with those of white ginseng extract (WG) and red ginseng extract (RG). Methods: Ten-month-old mice were fed an AIN-93G-based diet containing 10 g/kg (low dose, L) or 30 g/kg (high dose, H) WG powder, RG powder, or BG powder for 24 wk. We measured serum lipids, the activities of antioxidant enzymes, and malondialdehyde levels. Additionally, the protein expression levels of choline acetyltransferase and vesicular acetylcholine transporter, which are presynaptic cholinergic markers in the cortex and hippocampus of the brain, were measured by western blotting. Results: Triglyceride levels were reduced in all the extract-treated mice, except those in the LBG group. High-density lipoprotein cholesterol levels in the HBG group were higher than those in the control group. Total cholesterol levels were reduced in the LBG group. Additionally, glucose levels in the HBG group were significantly reduced by 41.2%. There were lower levels of malondialdehyde in the LBG group than in the control group. Furthermore, glutathione reductase activity increased in the HWG group and the HRG group. The protein expression levels of choline acetyltransferase and vesicular acetylcholine transporter significantly increased in all the ginseng-treated groups. Conclusion: The results suggest that supplementation with the tested ginseng extracts may suppress the cognitive decline associated with aging, via regulation of the cholinergic and antioxidant defense

Dibenzocyclooctadiene Lignans of Schisandra Chinensis Fruits Attenuated Glutamate-inducedNeurotoxicity in Primary Cultures of Rat Cortical Cells

So Ra Kim,Mi Kyeong Lee,Choong Je Ma,Seung Hyun Kim,Young Choong Kim 한국식품과학회 2005 식품과학과 산업 Vol.38 No.4

Case Report : A case of Embryonal Rhabdomyosarcoma Of the Uterine Cervix in a Middle-Aged Woman

( A Ra Shim ),( Ma Ria Lee ),( Ji Heum Paek ),( Min Ju Kim ),( Sang Wun Kim ) 대한산부인과학회 2011 Obstetrics & Gynecology Science Vol.54 No.11

Embryonal rhabdomyosarcoma (RMS) of the cervix is rare and most commonly occurs in the late teens and early 20s. We report a case of cervical embryonal RMS in a 52-year-old woman. This patient presented with an abnormal vaginal bleeding for 2 months and a mass protruding from the introitus, measuring 7 × 6 cm. She underwent radical abdominal hysterectomy with bilateral pelvic lymph node dissection and radical vaginectomy. The fi nal pathologic result was cervical RMS, consistent with the Intergroup RMS study group IIC. Immunohistochemistry was positive for desmin, myogenin, and myogenic diffentiation 1. The patient received conservative management in a convalescent hospital without adjuvant treatment due to cerebral hemorrhage and relapsed septic condition after surgery.

유아교사의 자기효능감과 교사 리더십의 관계

마지순(Ma, Ji-Sun),안라리(An, Ra-Ri),강영식(Kang, Young-Sig) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.7

본 연구의 목적은 유아교사의 자기효능감과 교사리더십의 관계를 알아보고 자기효능감이 교사리더십에 미치는 영향 을 알아봄으로써, 유아교육 현장에서 교사의 리더십을 향상시키기 위한 방안을 탐색하는 것이다. 이를 위해 충남과 대전광역 시 유치원과 어린이집 교사 216명을 대상으로 질문지를 사용하여 실시하였다. 연구결과는 다음과 같다. 첫째, 유아교사의 자기효능감이 높으면 교사리더십이 높게 나타났고, 특히 과업주도성이 가장 높은 것으로 나타났다. 풍토조성효능감은 리더십 전체와 가장 높은 정적상관이 있는 것으로 나타났다. 둘째, 유아교사의 자기효능감이 교사리더십에 영향을 미치는 것으로 나타났다. 하위요인에서는 교수효능감, 부모참여효능감, 훈육효능감, 의사결정효능감 순으로 영향을 미치는 것으로 나타났다. The purpose of this study is to investigate the relationship between teacher's self-efficacy and teacher’s leadership in kindergartens and child care centers. The subjects are 215 teachers employed in kindergartens or child care centers in Chungnam & Daejeon Metropolitan City. Questionnaires, which required self-reporting by teachers, are used to investigate teacher's self-efficacy and teacher’s leadership. The data are analyzed by frequency, percent, Pearson's correlation and stepwise regression. The results of this study are as follow. First, teacher's self-efficacy is positively associated with teacher's leadership. Second, teacher's self-efficacy affect teacher's leadership.