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Ymittos Athens, Greece

Leventis M.D.,National and Kapodistrian University of Athens | Fairbairn P.,University of Detroit Mercy | Dontas I.,National and Kapodistrian University of Athens | Faratzis G.,Greek Anticancer Institute | And 4 more authors.
Implant Dentistry | Year: 2014

PURPOSE: The aim of this study was to evaluate the effect of a biphasic synthetic bone graft material composed of β-tricalcium phosphate (β-TCP) and calcium sulfate (CS) in 12 New Zealand rabbits. MATERIALS AND METHODS: A circular bicortical critical-size cranial defect was created in each of 12 rabbits. The defects were grafted with β-TCP/CS. Animals were euthanized at 3 and 6 weeks. Harvested tissue specimens were evaluated histologically and histomorphometrically. Parameters associated with new bone formation and graft resorption were measured and calculated. The results were statistically analyzed using the Mann-Whitney test. RESULTS: Our data demonstrated the biocompatibility of synthetic β-TCP/CS, as no inflammatory response was observed, and no fibrosis was developed between the graft particles and the newly formed bone. Moreover, β-TCP/CS acted as an osteoconductive scaffold that allowed a significant bone regeneration and graft biodegradation with time. CONCLUSION: In this animal model, synthetic β-TCP/CS proved to be a biocompatible, osteoconductive, and bioresorbable bone graft substitute. Copyright © 2013 by Lippincott Williams & Wilkins. Source


Pitak-Arnnop P.,University of Sfax | Pitak-Arnnop P.,University of Paris Descartes | Sader R.,Goethe University Frankfurt | Rapidis A.D.,Greek Anticancer Institute | And 4 more authors.
Journal of Cranio-Maxillofacial Surgery | Year: 2010

Background: Publication bias (PB) diminishes the full distribution of research, distorts and discredits the scientific record, and thus compromises evidence-based practice. The objective of this study was to analyse published controlled trials with regard to PB in leading oral and maxillofacial surgery (OMS) journals. Methods: All controlled trials published in the International Journal of Oral and Maxillofacial Surgery, Journal of Cranio-Maxillofacial Surgery, Journal of Oral and Maxillofacial Surgery, and British Journal of Oral and Maxillofacial Surgery in 2008 were analysed for a primary outcome, country of authors, sample size, gender of the first author, funding source and location of the study. Results: Of 952 published articles, 53 controlled trials (5.7%) were identified. The OMS journals preferentially published controlled trials with a positive outcome (77.4%) and from high-income countries (73.6%). Single-centred trials (86.8%) with low sample size (n < 100; 69.8%) were published more frequently. The majority of the first authors were male (75.5%). Funding source disclosure in most studies (73.6%). Conclusions: Our results suggest the possible existence of PB in the OMS literature. Hence, it should be borne in mind that the published articles may not be representative of all scientific works, especially when systematic reviews and meta-analyses are conducted or read. In the meantime, journals should establish measures to eliminate PB to uphold scientific integrity. However, this study was an observation based on the published articles. An analysis of all submitted manuscripts would provide more accurate estimates of PB. Ethical considerations on PB are also discussed. © 2009 European Association for Cranio-Maxillofacial Surgery. Source


Warnakulasuriya S.,Kings College London | Fennell N.,Kings College London | Diz P.,University of Santiago de Compostela | Seoane J.,University of Santiago de Compostela | Rapidis A.,Greek Anticancer Institute
Journal of Oral Pathology and Medicine | Year: 2015

Background: Close to 50% of oral cancer (OC) patients still present in advanced stages of disease. Screening, in medicine and dentistry, is a strategy to identify an unrecognised disorder in individuals without signs and symptoms. There are several cancers that fit valid criteria for screening, but whether or not to screen a population for OC remains a dilemma. However, many screening programmes for OC and detection of potentially malignant disorders are described. Many of these have been conducted in Europe, but the feasibility of screening for OC has not been systematically addressed. Methods: A systematic review was conducted using the key words of interest. Based on our inclusion criteria, 16 European studies spanning three decades were selected from the published English literature. These studies were systematically analysed. The results were discussed with an expert EU consortium built with the task to promote the early detection of OC. Results: There were no consistent results or conclusions across the studies reviewed, largely as a result of there being a wide variety in the screening models and methods of data analysis adopted by each group. In nine of the studies reviewed, whilst descriptive findings from screening were presented, the authors had not attempted to analyse the outcomes. Additionally, only one study reported follow-up data of the screened population. Conclusions: In order to uphold the benefits of screening, it is necessary to demonstrate an improvement in survival rates following early detection. No such randomised control trials (RCT) on OC have been undertaken in Europe. Undertaking such a RCT may be difficult in the European setting. However, the feasibility of screening for OPMDs by conventional oral examination has been demonstrated, supporting a strategy to adopt appropriate screening models, and further action from the European countries should be to demonstrate methods of halting their progression by tested interventions. We provide a brief guideline for future screening studies. © 2014 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd. Source


Linardoutsos G.,Greek Anticancer Institute | Rapidis A.D.,Greek Anticancer Institute | Rapidis A.D.,University College London | Lowe D.,University of Liverpool | And 2 more authors.
Journal of Cranio-Maxillofacial Surgery | Year: 2014

The University of Washington Quality of Life (UW-QOL) questionnaire, created in 1993 to evaluate health related quality of life, has been widely used in English-speaking populations and translated and validated in other languages. The aim of the present study was to carefully translate and psychometrically validate the UW-QOL questionnaire in Greek. The revised version of the questionnaire was obtained by forward and backward translation of the original English version, according to internationally accepted guidelines. Validation was performed in 120 patients with head and neck cancer treated in a Greek Anticancer Institute in Athens, during their follow-up visits. Eligible patients completed the Greek version of the questionnaire and two other previously validated quality of life questionnaires (EORTC QLQ H&N35 and C-30). Related data and the patients' demographics were extracted from the patient's notes. Strong internal consistency (mean Cronbach α value of 0.83) was shown, with good construct validity. Statistically significant differences were noted between tumour staging and treatment modality and global quality of life. Strong correlation was shown between previously validated EORTC questionnaires and the translated UW-QOL questionnaire. In conclusion, the Greek version of the UW-QOL questionnaire appears to be culturally appropriate and psychometrically valid. © 2013 European Association for Cranio-Maxillo-Facial Surgery. Published by Elsevier Ltd. All rights reserved. Source


Loupatatzi A.,Agia Sofia Childrens Hospital | Stavrianos S.D.,Greek Anticancer Institute | Karantonis F.F.,Athens Naval Hospital | Machairas A.,National and Kapodistrian University of Athens | And 3 more authors.
Journal of Oral and Maxillofacial Surgery | Year: 2014

Purpose: To investigate gender and other possible factors affecting the frequency and severity of postoperative complications in head and neck cancer free flap reconstruction. Materials and Methods: A prospective longitudinal cohort study was conducted at the Greek Anticancer Institute, St. Savvas Hospital in head and neck cancer free flap reconstruction concerning postoperative complications. We documented the patients' demographic characteristics, social habits, and perioperative factors (ie, duration of general anesthesia), reconstructive techniques, neoadjuvant radiotherapy, and physical status. Initially, univariate statistical analysis was performed to confirm which predictor variables might influence the presence and severity of complications. Next, multivariate statistical analysis was performed using logistical regression and including the factors that were statistically significant on univariate analysis. Results: From 1999 to 2009, we assessed 95 patients who had undergone surgery for head and neck cancer. Of the 95 patients, 24 were women and 71 were men. The patient age range was 20 to 87 years (mean 52, median 55). A total of 55 complications occurred in 49 patients (51.57%). Of the 55 complications, 12 (12.63%) were of major severity, 21 (22.10%) of median severity, and 22 (23.15%) of low severity. The statistical analysis revealed that the factors associated with complications were preoperative radiotherapy, female gender, and operation time. The factors associated with severe complications were female gender and alcohol use. Conclusions: Multivariate analysis of the data revealed that the factor associated with an increased incidence of postoperative complications was preoperative radiotherapy. Moreover, the variable that remained statistically significant and correlated with an increased incidence and severity of free flap reconstruction complications was female gender. Identifying the etiology of these findings is an intriguing field for additional research. © 2014 Published by Elsevier Inc on behalf of the American Association of Oral and Maxillofacial Surgeons. All rights reserved. Source

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