lunes, 24 de octubre de 2016

Usage of Low Level Laser Biostimulation and Platelet Rich Fibrin in Bone Healing

Dent. Med. Probl. 2016, 53, 3, 338–344

Usage of Low Level Laser Biostimulation and Platelet Rich Fibrin in Bone Healing: Experimental Study

Khaled Atef El-Hayes (1), Ahmed Abbas Zaky (2), Zeinab Amin Ibrahim (3), Ghada Farouk Ahmed Allam (4), Mohamed Farouk Allam (5).


1 Oral and Maxillofacial Surgery, Faculty of Oral and Dental Medicine, Cairo University, Cairo, Egypt
2 Medical Laser Applications, National Institute of Laser Enhanced Sciences, Cairo University, Cairo, Egypt
3 Oral Biology, Faculty of Oral and Dental Medicine, Cairo University, Cairo, Egypt
4 Faculty of Oral and Dental Medicine, Cairo University, Cairo, Egypt
5 Department of Preventive Medicine and Public Health, Faculty of Medicine, University of Cordoba, Cordoba,Spain

Abstract

Background. Experimental studies have shown that low level laser therapy (LLLT) has a positive local biostimulative effect in the early stage of bone healing. Platelet rich fibrin (PRF) also has been shown to be effective in the treatment of intrabony periodontal defects.

Objectives. The objective of our experimental study was to demonstrate the combined effects of LLLT and PRF on bone healing.

Material and Methods. Our experimental study was done over 80 bony cavities in 20 adult male rabbits, aged 12 months. An incision was made for exposure of the femur bone of all rabbits. Then, by using a large, round surgical bur, a perforated hole was made in the femur. The cavities induced in these rabbits were divided into 4 groups: The control group which was neither subjected to any laser irradiation nor filled with any bone substitute (group I);
The bony defects were filled with PRF (group II); The cavities were subjected to low level laser (LLL) for biostimulation (group III); The cavities were subjected to LLL for biostimulation then were filled with PRF (group IV).
Histological assessments of the four groups were done using a hematoxylin and eosin stain. Statistical analysis was done using ANOVA and Bonferroni tests for comparisons between the four groups.

Results. The area percentage of the newly formed bone in group IV was significantly higher than the other three groups. The area percentage of the newly formed bone in group III is significantly higher than group II.

Conclusions. LLLT could induce bone formation in the bone defect at a faster rate than PRF. However, a combination of both LLLT and PRF as treatment modalities could induce bone formation in the bone defect more than that of LLLT or PRF alone (Dent. Med. Probl. 2016, 53, 3, 338–344).

Key words: low level laser, biostimulation, experimental study, bone healing, platelet rich fibrin.

http://www.dmp.umed.wroc.pl/en/article/2016/53/3/338/ 

sábado, 22 de octubre de 2016

Possible Association between Underarm Deodorants/Antiperspirants Use and Breast Cancer Risk?

BREAST CANCER AND DEODORANTS/ ANTIPERSPIRANTS: A SYSTEMATIC REVIEW

Mohamed Farouk Allam (1,2)
1. Department of Preventive Medicine and Public Health, Faculty of Medicine, University of Cordoba, Cordoba, Spain.
2. Department of Community, Environmental and Occupational Medicine, Faculty of Medicine, Ain Shams University, Cairo, Egypt.

SUMMARY
Background: Over the last decade, the possible association between underarm deodorants/antiperspirants use and breast cancer risk has raised important interest in the scientific community. The objective of our systematic review is to estimate the pooled risk of deodorants/antiperspirants use for breast cancer.
Methods: All observational studies that evaluated the association between breast cancer risk and deodorants/antiperspirants use were reviewed. We have only identified two case-control studies, carried out between 2002 and 2006.
Results: The first study was conducted in the USA and investigated the possible relationship between the use of products applied for underarm perspiration and the risk for breast cancer in women aged 20–74 years. This population-based case-control study gathered information by in-person interview. The second study was conducted in Iraq and investigated the possible relationship between the use of antiperspirants and the risk for breast cancer in women attending a teaching hospital. This study also gathered information by in-person interview. There was no risk of antiperspirants use in the pooled risk (odds ratio 0.40, 95% confidence interval 0.35–0.46).
Conclusion: Our comprehensive search has identified an insufficient number of studies to conduct a quantitative review and obtain reliable results. Further prospective studies are strongly needed.

KEYWORDS: Cancer; antiperspirants; breast; case-control; cohort; deodorants; meta-analysis; systematic review

PMID:b27755864
DOI: 10.21101/cejph.a4475 [PubMed - in process] 

http://apps.szu.cz/svi/cejph/show_en.php?kat=archiv/2016-3-15  

sábado, 15 de octubre de 2016

La Diferencia entre la Investigación Cuantitativa y la Investigación Cualitativa

El Principito: A los adultos les gustan los números. Cuando uno les habla de un nuevo amigo, nunca preguntan sobre lo esencial. Nunca te dicen: "Cómo es el sonido de su voz? Cuáles son los juegos que prefiere? Colecciona mariposas?" Te preguntan: "Qué edad tiene? Cuántos hermanos tiene? Cuánto pesa? Cuánto gana su padre?" Sólo entonces creen conocerlo. Si uno dice a los adultos: "Vi una bella casa de ladrillos rosas, con geranios en las ventanas y palomas en el techo..." no logran imaginársela. Hay que decirles: "Vi una casa de cien mil francos." Entonces exclaman: "Qué lindo !"

sábado, 1 de octubre de 2016

International pooled study on diet and bladder cancer

International pooled study on diet and bladder cancer: the bladder cancer, epidemiology and nutritional determinants (BLEND) study: design and baseline characteristics.

Arch Public Health. 2016 Jul 6;74:30. doi: 10.1186/s13690-016-0140-1. eCollection
2016.

Goossens ME(1), Isa F(2), Brinkman M(3), Mak D(2), Reulen R(2), Wesselius A(4),
Benhamou S(5), Bosetti C(6), Bueno-de-Mesquita B(7), Carta A(8), Allam MF(9),
Golka K(10), Grant EJ(11), Jiang X(12), Johnson KC(13), Karagas MR(14), Kellen E(15), La Vecchia C(16), Lu CM(17), Marshall J(18), Moysich K(18), Pohlabeln H(19), Porru S(8), Steineck G(20), Stern MC(12), Tang L(18), Taylor JA(21), van
den Brandt P(22), Villeneuve PJ(23), Wakai K(24), Weiderpass E(25), White E(26),
Wolk A(27), Zhang ZF(28), Buntinx F(29), Zeegers MP(30).

Author information:
(1)Department of General Practice, Katholieke Universiteit Leuven, ACHG-KU
Leuven, Kapucijnenvoer 33, Blok J, bus 7001, 3000 Leuven, Belgium. (2)Department of Public Health, Epidemiology and Biostatistics, University of Birmingham,Birmingham, UK. (3)The Cancer Council Victoria, Melbourne, Australia. (4)NUTRIM School for Nutrition and Translational Research in Metabolism, University of Maastricht, Maastricht, The Netherlands. (5)INSERM U946, Variabilite Genetique et Maladies Humaines, Fondation Jean Dausset / CEPH, Paris, France. (6)Laboratory of General Epidemiology, Istituto di Ricerche Farmacologiche "Mario Negri", Milan, Italy. (7)Determinants of Chronic Diseases (DCD), National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands ; Gastroenterology and Hepatology, University Medical Centre, Utrecht, The Netherlands ; Epidemiology and Biostatistics, The School of Public Health, Imperial College London, London, UK ; Social and Preventive Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia. (8)Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, Section of Public Health and Human Sciences, University of Brescia, Brescia, Italy. (9)Department of Preventive Medicine and Public Health, Faculty of Medicine, University of Cordoba, Cordoba, Spain. (10)Leibniz Research Centre for Working Environment and Human Factors at TU Dortmund, Dortmund, Germany. (11)Department of Epidemiology Radiation Effects Research Foundation, Hiroshima, Japan. (12)Department of Preventive Medicine, University of Southern California, Los Angeles, CA USA. (13)Department of Epidemiology and Community Medicine, University of Ottawa, Ottawa, ON Canada. (14)Department of Epidemiology, Geisel School of Medicine at Dartmouth, Hanover, NH USA. (15)Leuven University Centre for Cancer Prevention (LUCK), Leuven, Belgium. (16)Department of Clinical Medicine and Community Health, University of Milan, Milan, Italy. (17)Department of Urology, Buddhist Dalin Tzu Chi General Hospital, Dalin Township, 62247 Chiayi County Taiwan. (18)Department of Cancer Prevention and Control, Roswell Park Cancer Institute, Buffalo, NY USA. (19)Leibniz Institute for Prevention Research and Epidemiology - BIPS, Bremen, Germany. (20)Department of Oncology and Pathology, Division of Clinical Cancer Epidemiology, Karolinska Hospital, Stockholm, Sweden. (21)Epidemiology Branch, and Epigenetic and Stem Cell Biology Laboratory, National Institute of Environmental Health Sciences, NIH, Research Triangle Park, NC USA. (22)Department of Epidemiology, Schools for Oncology and Developmental
Biology and Public Health and Primary Care, Maastricht University Medical Centre, Maastricht, The Netherlands. (23)Population Studies Division Health Canada, Ottawa, ON Canada. (24)Department of Preventive medicine, Nagoya University Graduate School of Medicine, Nagoya, Japan. (25)Department of Medical Epidemiology and Biostatistics, Medical Epidemiology, Karolinska Institutet, Stockholm, Sweden ; Department of Research, Cancer Registry of Norway, Institute of Population-Based Cancer Research, Oslo, Norway ; Genetic Epidemiology Group, Folkhälsan Research Center, Helsinki, Finland ; Department of Community Medicine, University of Tromsø, The Arctic University of Norway, Tromsø, Norway. (26)Fred Hutchinson Cancer Research Center, Seattle, WA USA. (27)Division of Nutritional Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden. (28)Departments of Epidemiology, UCLA Center for Environmental Genomics, Fielding School of Public Health, University of California, Los Angeles (UCLA), Los Angeles, CA USA. (29)Department of General Practice, Katholieke Universiteit Leuven, ACHG-KU Leuven, Kapucijnenvoer 33, Blok J, bus 7001, 3000 Leuven, Belgium ; CAPHRI School for Public Health and Primary Care, University of Maastricht, Maastricht, The Netherlands. (30)NUTRIM School for Nutrition and Translational Research in Metabolism, University of Maastricht, Maastricht, The Netherlands ; CAPHRI School for Public Health and Primary Care, University of Maastricht, Maastricht, The Netherlands ; School of Cancer Sciences, University of Birmingham, Birmingham, UK.

BACKGROUND: In 2012, more than 400,000 urinary bladder cancer cases occurred worldwide, making it the 7(th) most common type of cancer. Although many previous studies focused on the relationship between diet and bladder cancer, the evidence related to specific food items or nutrients that could be involved in the development of bladder cancer remains inconclusive. Dietary components can either be, or be activated into, potential carcinogens through metabolism, or act to prevent carcinogen damage.
METHODS/DESIGN: The BLadder cancer, Epidemiology and Nutritional Determinants (BLEND) study was set up with the purpose of collecting individual patient data from observational studies on diet and bladder cancer. In total, data from 11,261 bladder cancer cases and 675,532 non-cases from 18 case-control and 6 cohort studies from all over the world were included with the aim to investigate the association between individual food items, nutrients and dietary patterns and risk of developing bladder cancer.
DISCUSSION: The substantial number of cases included in this study will enable us to provide evidence with large statistical power, for dietary recommendations on the prevention of bladder cancer.

DOI: 10.1186/s13690-016-0140-1
PMCID: PMC4933992
PMID: 27386115  [PubMed]