Klinik und Poliklinik für Mund-, Kiefer- und Gesichtschirurgie/Plastische Operationen
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Institute
The local anesthetic lidocaine, which has been used extensively during liposuction, has been
reported to have cytotoxic effects and therefore would be unsuitable for use in autologous lipotransfer.
We evaluated the effect of lidocaine on the distribution, number, and viability of adipose-derived stem
cells (ASCs), preadipocytes, mature adipocytes, and leukocytes in the fatty and fluid portion of the
lipoaspirate using antibody staining and flow cytometry analyses. Adipose tissue was harvested from
11 female patients who underwent liposuction. Abdominal subcutaneous fat tissue was infiltrated
with tumescent local anesthesia, containing lidocaine on the left and lacking lidocaine on the right
side of the abdomen, and harvested subsequently. Lidocaine had no influence on the relative
distribution, cell number, or viability of ASCs, preadipocytes, mature adipocytes, or leukocytes in the
stromal-vascular fraction. Assessing the fatty and fluid portions of the lipoaspirate, the fatty portions
contained significantly more ASCs (p < 0.05), stem cells expressing the preadipocyte marker Pref-1
(p < 0.01 w/lidocaine, p < 0.05 w/o lidocaine), and mature adipocytes (p < 0.05 w/lidocaine, p < 0.01
w/o lidocaine) than the fluid portions. Only the fatty portion should be used for transplantation. This
study found no evidence that would contraindicate the use of lidocaine in lipotransfer. Limitations of
the study include the small sample size and the inclusion of only female patients.
Plasma medical oncology: Immunological interpretation in head and neck squamous cell carcinoma
(2020)
Over the past several years, various important articles focusing on cancer therapy
approaches in head and neck squamous cell carcinomas (HNSCCs) using cold
atmospheric plasma (CAP) have been published (SEMMLER et al. 2020 [53],
METELMANN et al. 2018 [44], KEIDAR et al. 2011 [33]). This doctoral thesis presents
selected results from a prospective observational clinical study in CAP therapy of
palliative HNSCC patients, carried out at the Department of Oral and Maxillofacial
Surgery/Plastic Surgery of the Greifswald University Medicine. For oral and
maxillofacial surgeons, ulcerated surfaces of locally advanced head and neck squamous
cell carcinomas (UICC IV) offer a challenging treatment assignment with microbial
contamination and tumour progression. The clinical attempt appears to eradicate
microbial contamination and to initiate tumour regression. This doctoral thesis will
describe the processes of human tumour biology and tumour immunology in HNSCCs
and the extent of present knowledge concerning plasma medical oncology as an
anticancer modality. In the introduction of the doctoral thesis clinical results of plasma
therapy in locally advanced HNSCCs (UICC IV) are set out. This mainly includes the
investigation of a therapeutic concept, the treatment phases, the tumour size development
and the morphological changes of the infected tumour surface following cold atmospheric
plasma therapy. In the main part, a detailed immunological interpretation is proposed on
the basis of present preclinical and clinical immunological knowledge. Finally,
unexplored questions in plasma medical oncology are highlighted. This is highly
significant for future plasma research and clinical anticancer therapy.
Die autologe Fettgewebstransplantation ist eine in der plastischen Chirurgie routinemäßig angewandte Methode. Die Indikationen reichen von der Rekonstruktion nach Teilresektion der Mamma, über Einspritzung bei narbigen Einziehungen zur Wiederherstellung des Körperreliefs, bis zum Einsatz bei Lipodystrophien wie sie beispielsweise im Rahmen von HIV-Medikationen vorkommen können. Dieser Eingriff erfolgt überwiegend in Lokalästhesie, unter Verwendung von Lidocain, um dem Patienten die Belastung einer Vollnarkose zu ersparen. Die Lipotoxizität dieses Lokalanästhetikums würde hierbei dessen Einsatz ausschließen. Die vorliegende Studie verwendet einen Versuchsaufbau, der es ermöglicht bei Patienten intraindividuell den Einfluss von Lidocain auf Zellen des Fettgewebes quantitativ zu evaluieren. Nach Zellisolierung aus dem Gewebeverband wurden einzelne Zelltypen der Stromal-Vascular Fraction mittels Antikörperfärbung identifiziert. Wir konnten zeigen, dass Lidocain keinen Einfluss auf prozentuale Verteilung, Absolutzellzahlen und Vitalität von Fettgewebsstammstellen, Präadipozyten, reifen Fettzellen und Leukozyten hat. Zudem unterstützen die Ergebnisse, dass beim Lipotransfer ausschließlich die feste Phase des Lipoaspirates transplantiert werden sollte. Insgesamt sprechen die Ergebnisse der vorliegenden Studie für die Verwendung von Lidocain in therapeutischer Konzentration zur Eigenfetttransplantation, was gegen die Notwendigkeit einer Vollnarkose spricht. Die gewählte Methodik verwendet einen Versuchsaufbau der Daten mit direkter Relevanz für die Durchführung der Eigenfetttransplantation generiert. Sie leistet somit einen wichtigen Beitrag zur Optimierung des Lipotransfers. Dies schmälert die Notwendigkeit von Folgeeingriffen zur Revision, was unter anderem zur Steigerung der Patientenzufriedenheit führt.
Bei der Vielzahl der bestehenden Methoden wäre für zukünftige Forschung in dem Bereich der Eigenfetttransplantation eine genauere Abstimmung der einzelnen Forschungsgruppen untereinander nötig. Für weitere Studien sind somit von wirtschaftlichen Interessen unabhängige und international koordinierte Untersuchungen wünschenswert.
Objectives: To examine the association between third molars and orofacial pain. We hypothesized that impacted third molars are a cause of orofacial pain.
Methods: Magnetic resonance images of 1808 participants from two populationbased cohorts from Northeastern Germany were analysed to define the status of third molars according to the Pell and Gregory classification. A self-reported questionnaire and a clinical dental examination were used to detect chronic and acute complaints of orofacial pain, masticatory muscle pain, migraine and other types of headache. Logistic regression models were used to analyse the associations between third molar status and orofacial pain.
Results: Individuals with impacted third molars in the maxilla had a higher chance of chronic orofacial pain than those with erupted third molars (odds ratio 2.19; 95% CI 1.19-4.02). No such association was detected for third molars in the lower jaw. Third molars were not associated with masticatory muscle pain, migraine or other types of headache.
Conclusions: Impacted maxillary third molars might be a cause of chronic orofacial pain. Thus, physicians should consider the eruption/impaction status of third molars in their decision-making process when treating patients who complain of orofacial pain.