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  1. Article ; Online: Effects of Minocycline Hydrochloride as an Adjuvant Therapy for a Guided Bone Augmentation Procedure in The Rat Calvarium.

    Biewer, Bob / Rompen, Eric / Mittelbronn, Michel / Hammer, Gaël P / Quatresooz, Pascale / Borgmann, Felix Kleine

    Dentistry journal

    2023  Volume 11, Issue 4

    Abstract: This in vivo study reports the influence of minocycline-HCl administration on extra-skeletal bone generation in a Guided Bone Augmentation model, utilizing titanium caps placed on the intact as well as perforated calvaria of rats. The test group was ... ...

    Abstract This in vivo study reports the influence of minocycline-HCl administration on extra-skeletal bone generation in a Guided Bone Augmentation model, utilizing titanium caps placed on the intact as well as perforated calvaria of rats. The test group was administered 0.5 mg/mL minocycline-HCl with the drinking water, and the amount of bone tissue in the caps was quantified at three time points (4, 8 and 16 weeks). A continuously increased tissue fill was observed in all groups over time. The administration of minocycline-HCl as well as perforation of the calvaria increased this effect, especially with regard to mineralization. The strongest tissue augmentation, with 1.8 times that of the untreated control group, and, at the same time, the most mineralized tissue (2.3× over untreated control), was produced in the combination of both treatments, indicating that systemic administration of minocycline-HCl has an accelerating and enhancing effect on vertical bone augmentation.
    Language English
    Publishing date 2023-03-31
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2681351-8
    ISSN 2304-6767 ; 2304-6767
    ISSN (online) 2304-6767
    ISSN 2304-6767
    DOI 10.3390/dj11040092
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Effects of Low Intensity Pulsed Ultrasound Stimulation on the Temporal Dynamics of Irradiated Bone Tissue Healing: A Histomorphometric Study in Rabbits.

    Biewer, Bob / Kleine-Borgmann, Felix / Hammer, Gaël P / Rompen, Eric H / Mittelbronn, Michel / Quatresooz, Pascale

    International journal of molecular sciences

    2022  Volume 23, Issue 20

    Abstract: The present study evaluated the influence of Low-Intensity Pulsed Ultrasound (LIPUS) on the regeneration processes of non-critical-size bone defects in irradiated and non-irradiated rabbit tibias. Bone defects were surgically created on both tibiae of ... ...

    Abstract The present study evaluated the influence of Low-Intensity Pulsed Ultrasound (LIPUS) on the regeneration processes of non-critical-size bone defects in irradiated and non-irradiated rabbit tibias. Bone defects were surgically created on both tibiae of six rabbits. The control group had no additional treatment. In one intervention group, one tibia was irradiated with 15 Gy in a single dose. A second group was treated with LIPUS, and a third with a combination of both treatments. The control samples showed 83.10% ± 17.79% of bone repair after 9 weeks, while the irradiated bone had regenerated significantly less during the same period (66.42% ± 29.36%). The LIPUS treatment on irradiated bones performed a 79.21% ± 21.07% bone fill and could not significantly improve the response compared to the non-treated irradiated specimens. However, LIPUS treatment on non-irradiated bone showed bone formations beyond the size defect (115.91% ± 33.69%), which was a highly significant increase when compared to the control group or any irradiated group. The application of ultrasound to healthy bone produced highly significant and enhanced bone formations with 36.70% more regenerated bone when compared to the same application on irradiated bone. LIPUS vibration stimuli may be considered as a promising complementary treatment approach in non-irradiated bone regeneration procedures to shorten the treatment and enhance bone healing. In irradiated bones, the effect of ultrasound application is less clear, and further studies are needed to refine the dynamics of the present results.
    MeSH term(s) Animals ; Rabbits ; Ultrasonic Therapy/methods ; Bone Regeneration/physiology ; Wound Healing ; Ultrasonic Waves ; Bone Diseases ; Bone and Bones
    Language English
    Publishing date 2022-10-17
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms232012426
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Cohort study of occupational cosmic radiation dose and cancer mortality in German aircrew, 1960-2014.

    Dreger, Steffen / Wollschläger, Daniel / Schafft, Thomas / Hammer, Gaël P / Blettner, Maria / Zeeb, Hajo

    Occupational and environmental medicine

    2020  Volume 77, Issue 5, Page(s) 285–291

    Abstract: Objectives: To determine cancer mortality compared with the general population and to examine dose-response relationships between cumulative occupational radiation dose and specific cancer outcomes in the German aircrew cohort.: Methods: For a cohort ...

    Abstract Objectives: To determine cancer mortality compared with the general population and to examine dose-response relationships between cumulative occupational radiation dose and specific cancer outcomes in the German aircrew cohort.
    Methods: For a cohort of 26 846 aircrew personnel, standardised mortality ratios (SMR) were calculated. Dose-response analyses were carried out using Poisson regression to assess dose-related cancer risks for the period 1960-2014. Exposure assessment comprises recently available dose register data for all cohort members and newly estimated retrospective cabin crew doses for 1960-2003.
    Results: SMR for all-cause, specific cancer groups and most individual cancers were reduced in all aircrew groups. The only increases were seen for brain cancer in pilots (n=23, SMR 2.01, 95% CI 1.15 to 3.28) and for malignant melanoma (n=10, SMR 1.88, 95% CI 0.78 to 3.85). Breast cancer mortality among female cabin crew was similar to the general population (n=71, SMR 1.06, 95% CI 0.77 to 1.44). Overall median cumulative effective dose was 34.2 mSv (max: 116 mSv) for 1960-2014. No dose-response associations were seen in any of the models. For brain cancer, relative risks were elevated across dose categories. An indicative negative trend with increasing dose category was seen for large intestine cancer in female cabin crew (n=23).
    Conclusions: There was no evidence for significant dose-response patterns for the considered cancer types. Interpretation of results remains difficult as cumulative dose is closely related to age. Future work should focus on investigating radiation jointly with other risk factors that may contribute to risks for specific cancers among aircrew.
    MeSH term(s) Aged ; Brain Neoplasms/etiology ; Brain Neoplasms/mortality ; Cohort Studies ; Cosmic Radiation ; Dose-Response Relationship, Radiation ; Female ; Germany/epidemiology ; Humans ; Male ; Melanoma/etiology ; Melanoma/mortality ; Middle Aged ; Neoplasms, Radiation-Induced/mortality ; Occupational Diseases/etiology ; Occupational Diseases/mortality ; Occupational Exposure/adverse effects ; Radiation Dosage
    Language English
    Publishing date 2020-02-19
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1180733-7
    ISSN 1470-7926 ; 1351-0711
    ISSN (online) 1470-7926
    ISSN 1351-0711
    DOI 10.1136/oemed-2019-106165
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Second follow-up of a German cohort on childhood cancer incidence after exposure to postnatal diagnostic x-ray.

    Baaken, Dan / Hammer, Gaël P / Seidenbusch, Michael C / Schneider, Karl / Spix, Claudia / Blettner, Maria / Pokora, Roman / Lorenz, Eva

    Journal of radiological protection : official journal of the Society for Radiological Protection

    2019  Volume 39, Issue 4, Page(s) 1074–1091

    Abstract: Studies on children exposed to ionising radiation by computed tomography (CT) indicate an increased risk of leukemia and central nervous system (CNS) tumors. Evidence of the risks associated with diagnostic x-ray examinations, the most frequent ... ...

    Abstract Studies on children exposed to ionising radiation by computed tomography (CT) indicate an increased risk of leukemia and central nervous system (CNS) tumors. Evidence of the risks associated with diagnostic x-ray examinations, the most frequent examination in pediatric radiology, in which the radiation dose is up to 750 times lower compared to CT examinations, is less clear. This study presents results of the second follow-up for the risk of childhood cancer in a cohort of children (<15 years) with diagnostic x-ray exposure at a large German hospital during 1976-2003 followed for additional 10 years until 2016. With a latency period of 6 months, 92 998 children contributed 794 549 person-years. The median effective dose was 7 μSv. Hundred incident cancer cases were identified: 35 leukemia, 13 lymphomas, 12 CNS tumors, 15 blastomas, 15 sarcomas and 10 other solid tumors, consisting of six germ cells tumors, three thyroid cancers and one adrenocortical carcinoma. For all cancer cases combined the standardised incidence ratio (SIR) was 1.14 (95% confidence interval (CI) 0.93-1.39), for leukemia 1.15 (95% CI 0.63-1.61), for lymphomas 1.03 (95% CI 0.55-1.76), for CNS tumors 0.65 (95% CI 0.34-1.14), for blastomas 1.77 (95% CI 0.91-2.91), for sarcomas 1.28 (95% CI 0.71-2.11) and for other solid tumors 2.38 (95% CI 1.14-4.38). Dose-response analysis using Poisson regression revealed no significant trend for dose groups. Results did not differ substantially with a latency period of 2 years for all cancer entities and 5 years for solid tumors in sensitivity analyses. Overall, the null results of the first follow-up were confirmed. Although an association between radiation exposure and a risk for certain solid tumors like thyroid cancer is known, the significantly increased SIR in the group of other solid tumors must be critically interpreted in the context of the small number of cases and the very low doses of radiation exposure in this group.
    Language English
    Publishing date 2019-07-25
    Publishing country England
    Document type Journal Article
    ZDB-ID 639411-5
    ISSN 1361-6498 ; 0952-4746
    ISSN (online) 1361-6498
    ISSN 0952-4746
    DOI 10.1088/1361-6498/ab3506
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Epidemiological investigations of aircrew: an occupational group with low-level cosmic radiation exposure.

    Zeeb, Hajo / Hammer, Gaël P / Blettner, Maria

    Journal of radiological protection : official journal of the Society for Radiological Protection

    2012  Volume 32, Issue 1, Page(s) N15–9

    Abstract: Aircrew and passengers are exposed to low-level cosmic ionising radiation. Annual effective doses for flight crew have been estimated to be in the order of 2-5 mSv and can attain 75 mSv at career end. Epidemiological studies in this occupational group ... ...

    Abstract Aircrew and passengers are exposed to low-level cosmic ionising radiation. Annual effective doses for flight crew have been estimated to be in the order of 2-5 mSv and can attain 75 mSv at career end. Epidemiological studies in this occupational group have been conducted over the last 15-20 years, usually with a focus on radiation-associated cancer. These studies are summarised in this note. Overall cancer risk was not elevated in most studies and subpopulations analysed, while malignant melanoma, other skin cancers and breast cancer in female aircrew have shown elevated incidence, with lesser risk elevations in terms of mortality. In some studies, including the large German cohort, brain cancer risk appears elevated. Cardiovascular mortality risks were generally very low. Dose information for pilots was usually derived from calculation procedures based on routine licence information, types of aircraft and routes/hours flown, but not on direct measurements. However, dose estimates have shown high validity when compared with measured values. No clear-cut dose-response patterns pointing to a higher risk for those with higher cumulative doses were found. Studies on other health outcomes have shown mixed results. Overall, aircrew are a highly selected group with many specific characteristics and exposures that might also influence cancers or other health outcomes. Radiation-associated health effects have not been clearly established in the studies available so far.
    MeSH term(s) Aircraft/statistics & numerical data ; Cosmic Radiation ; Female ; Humans ; Incidence ; Male ; Neoplasms, Radiation-Induced/epidemiology ; Occupational Exposure/statistics & numerical data ; Radiation Dosage ; Radiometry/statistics & numerical data ; Risk Assessment ; Risk Factors ; Travel/statistics & numerical data
    Language English
    Publishing date 2012-03
    Publishing country England
    Document type Journal Article
    ZDB-ID 639411-5
    ISSN 1361-6498 ; 0952-4746
    ISSN (online) 1361-6498
    ISSN 0952-4746
    DOI 10.1088/0952-4746/32/1/N15
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Testicular cancer and viral infections: a systematic literature review and meta-analysis.

    Yousif, Lamyaa / Hammer, Gaël P / Blettner, Maria / Zeeb, Hajo

    Journal of medical virology

    2013  Volume 85, Issue 12, Page(s) 2165–2175

    Abstract: In 1984, Newell and coworkers were the first to suggest that testicular cancer might have a viral etiology since it showed similar characteristics to Hodgkin's lymphoma. A systematic literature review and meta-analysis was conducted to investigate a ... ...

    Abstract In 1984, Newell and coworkers were the first to suggest that testicular cancer might have a viral etiology since it showed similar characteristics to Hodgkin's lymphoma. A systematic literature review and meta-analysis was conducted to investigate a possible association between viral infections (EBV, CMV, Parvovirus B19, HPV, and HIV) and testicular cancer. Articles published from 1985 through June 2010 were located from MEDLINE and EMBASE databases, 21 articles were finally included in the review. For infection with EBV, CMV, Parvovirus B19, and HIV the pooled OR were 4.80 (95% CI 0.98-23.54), 1.85 (95% CI 0.92-3.70), 2.86 (95% CI 0.35-23.17), and 1.79 (95% CI 1.45-2.21) respectively. No pooling was possible for HPV infection studies due to small numbers. The results support a possible association, but more epidemiological studies with better viral identification and localization methods are needed to verify these findings.
    MeSH term(s) Case-Control Studies ; Humans ; Male ; Odds Ratio ; Testicular Neoplasms/etiology ; Virus Diseases/complications ; Virus Diseases/epidemiology
    Language English
    Publishing date 2013-12
    Publishing country United States
    Document type Journal Article ; Meta-Analysis ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 752392-0
    ISSN 1096-9071 ; 0146-6615
    ISSN (online) 1096-9071
    ISSN 0146-6615
    DOI 10.1002/jmv.23704
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Image-guided injection therapy in the lumbar spine.

    Krämer, Jürgen / Blettner, Maria / Hammer, Gael P

    Deutsches Arzteblatt international

    2008  Volume 105, Issue 34-35, Page(s) 596–598

    Language English
    Publishing date 2008-08-25
    Publishing country Germany
    Document type Editorial
    ZDB-ID 2406159-1
    ISSN 1866-0452
    ISSN 1866-0452
    DOI 10.3238/arztebl.2008.0596
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Shift Work and Prostate Cancer Incidence in Industrial Workers: A Historical Cohort Study in a German Chemical Company.

    Hammer, Gaël P / Emrich, Katharina / Nasterlack, Michael / Blettner, Maria / Yong, Mei

    Deutsches Arzteblatt international

    2015  Volume 112, Issue 27-28, Page(s) 463–470

    Abstract: Background: There is inconsistent evidence for a possible carcinogenic effect of shift work. In particular, little is known about the putative association of shift work with prostate cancer.: Method: We studied a cohort of 27,828 male industrial ... ...

    Abstract Background: There is inconsistent evidence for a possible carcinogenic effect of shift work. In particular, little is known about the putative association of shift work with prostate cancer.
    Method: We studied a cohort of 27,828 male industrial production workers residing in the German federal state of Rhineland-Palatinate who worked for at least one year in a chemical company in the period 1995-2005. We obtained data on shift work and potential confounders including age, occupational task, and duration of employment from personnel files and from the records of the occupational health service. New cases of cancer in the period 2000-2009 were ascertained from the state cancer registry. Differences in risk between shift workers and daytime workers were analyzed with Cox regression, stratified by stage of cancer, and adjusted for potential confounding effects.
    Results: There were 146 new cases of prostate cancer in 12,609 rotating shift workers and 191 in 15,219 daytime workers. The median year of birth was 1960 in the first group and 1959 in the second. The shift workers did not have an elevated hazard ratio for prostate cancer in comparison to the daytime workers (HR = 0.93, 95% confidence interval [CI] 0.73-1.18). Some differences were seen depending on tumor stage. Both groups of workers had a higher incidence of prostate carcinoma than the general population (standardized incidence rate [SIR] = 1.44, 95% CI 1.22-1.70 for daytime workers; SIR = 1.51, 95% CI 1.30-1.74 for shift workers).
    Conclusion: In this well-documented, large-scale cohort study, the incidence of prostate cancer among shift workers did not differ from that among daytime workers. In the authors' opinion, further follow-up of this relatively young cohort is required.
    MeSH term(s) Adult ; Age Distribution ; Chemical Industry/manpower ; Cohort Studies ; Employment/statistics & numerical data ; Germany/epidemiology ; Humans ; Incidence ; Male ; Middle Aged ; Occupational Diseases/diagnosis ; Occupational Diseases/epidemiology ; Prostatic Neoplasms/diagnosis ; Prostatic Neoplasms/epidemiology ; Work Schedule Tolerance ; Young Adult
    Language English
    Publishing date 2015-07-06
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2406159-1
    ISSN 1866-0452 ; 1866-0452
    ISSN (online) 1866-0452
    ISSN 1866-0452
    DOI 10.3238/arztebl.2015.0463
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: A retrospective cohort study of shift work and risk of incident cancer among German male chemical workers

    Mei Yong / Maria Blettner / Katharina Emrich / Michael Nasterlack / Christoph Oberlinner / Gaël P Hammer

    Scandinavian Journal of Work, Environment & Health, Vol 40, Iss 5, Pp 502-

    2014  Volume 510

    Abstract: OBJECTIVE: Human evidence of carcinogenicity concerning shift work is inconsistent. This industry-based cohort study aimed to examine the relationship between working in a rotating shift and cancer incidence. METHODS: The cohort consisted of male ... ...

    Abstract OBJECTIVE: Human evidence of carcinogenicity concerning shift work is inconsistent. This industry-based cohort study aimed to examine the relationship between working in a rotating shift and cancer incidence. METHODS: The cohort consisted of male production workers (12 609 shift and 15 219 day), employed in a large chemical industry for at least one year between 1995–2005, and residing in the German federal state of Rhineland-Palatinate. Incident cancer cases from 2000–2009 were identified through record linkage with the cancer registry of Rhineland-Palatinate. Information on exposure to shift work and potential confounders, including age, smoking status, job level, and employment duration, was extracted from the personnel and health records. Cox proportional hazard models were used to estimate hazard ratios (HR) with 95% confidence interval (95% CI) adjusted for potential confounders. RESULTS: Between 2000–2009, 518 and 555 cancer cases (excluding non-melanoma skin cancer) occurred among shift and day work employees, respectively. Compared to “never shift work”, shift workers experienced an increased risk of cancers neither at all-sites (HR 1.04, 95% CI 0.89–1.21) nor for prostate cancer in particular (HR 0.93, 95% CI 0.71–1.21). The risks of leukemia and esophagus cancer were increased if smoking was not taken into account, albeit based on small numbers. However, adjusting for smoking changed the HR and the risk diminished. CONCLUSIONS: Our analyses do not provide evidence for a carcinogenic effect of the shift system under study.
    Keywords retrospective cohort study ; industry-based ; chemical worker ; cancer ; incidence ; cancer risk ; shift work ; health surveillance ; male ; chemical industry ; germany ; circadian disruption ; Public aspects of medicine ; RA1-1270
    Subject code 300
    Language English
    Publishing date 2014-09-01T00:00:00Z
    Publisher Nordic Association of Occupational Safety and Health (NOROSH)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: A retrospective cohort study of shift work and risk of incident cancer among German male chemical workers.

    Yong, Mei / Blettner, Maria / Emrich, Katharina / Nasterlack, Michael / Oberlinner, Christoph / Hammer, Gaël P

    Scandinavian journal of work, environment & health

    2014  Volume 40, Issue 5, Page(s) 502–510

    Abstract: Objective: Human evidence of carcinogenicity concerning shift work is inconsistent. This industry-based cohort study aimed to examine the relationship between working in a rotating shift and cancer incidence.: Methods: The cohort consisted of male ... ...

    Abstract Objective: Human evidence of carcinogenicity concerning shift work is inconsistent. This industry-based cohort study aimed to examine the relationship between working in a rotating shift and cancer incidence.
    Methods: The cohort consisted of male production workers (12 609 shift and 15 219 day), employed in a large chemical industry for at least one year between 1995-2005, and residing in the German federal state of Rhineland-Palatinate. Incident cancer cases from 2000-2009 were identified through record linkage with the cancer registry of Rhineland-Palatinate. Information on exposure to shift work and potential confounders, including age, smoking status, job level, and employment duration, was extracted from the personnel and health records. Cox proportional hazard models were used to estimate hazard ratios (HR) with 95% confidence interval (95% CI) adjusted for potential confounders.
    Results: Between 2000-2009, 518 and 555 cancer cases (excluding non-melanoma skin cancer) occurred among shift and day work employees, respectively. Compared to "never shift work", shift workers experienced an increased risk of cancers neither at all-sites (HR 1.04, 95% CI 0.89-1.21) nor for prostate cancer in particular (HR 0.93, 95% CI 0.71-1.21). The risks of leukemia and esophagus cancer were increased if smoking was not taken into account, albeit based on small numbers. However, adjusting for smoking changed the HR and the risk diminished.
    Conclusions: Our analyses do not provide evidence for a carcinogenic effect of the shift system under study.
    MeSH term(s) Adult ; Chemical Industry ; Germany/epidemiology ; Humans ; Incidence ; Male ; Middle Aged ; Neoplasms/epidemiology ; Occupational Diseases/epidemiology ; Retrospective Studies ; Work Schedule Tolerance
    Language English
    Publishing date 2014-09
    Publishing country Finland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 191563-0
    ISSN 1795-990X ; 0355-3140
    ISSN (online) 1795-990X
    ISSN 0355-3140
    DOI 10.5271/sjweh.3438
    Database MEDical Literature Analysis and Retrieval System OnLINE

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