ABSTRACT
Four dogs were chosen for this study. An experimental fracture was made in the mandibular symphysis region of each dog. Two miniplates and eight screws were applied, and removed three and six months postoperatively. In this study, the surface and mechanical characteristics of titanium miniplates were evaluated. Study materials consisted of four groups. In each of the groups, there were six miniplates. The groups are as follows: Group A: Original plates (not used) as a control (i.e. used as a reference in comparisons) Group B: Original plates bent as in operation but not left in tissue Group C: Plates removed at third month postoperatively Group D: Plates removed at sixth month postoperatively. After evaluation of all groups, there was no difference in the microstructure of the surfaces but some differences in mechanical characteristics were apparent.
Subject(s)
Bone Plates , Fracture Fixation, Internal/instrumentation , Mandibular Fractures/surgery , Titanium , Animals , Biomechanical Phenomena , Bone Screws , Dogs , Evaluation Studies as Topic , Hardness , Microscopy , Surface Properties , Tensile Strength , Time FactorsABSTRACT
Tumor immunology has been studied in animal experiments. The studies of Prehn and Main in the year 1957, have been pioneer studies. The early diagnosis of cancer, the prognosis, proflaksia and treatment has been studied in several immunological experiments and is still being studied. In the investigations being made before the Second World War mostly the Conditions after the immunological answer has been studied from the beginning where the antigen enters the body and which organs and tissues the antigen enters, which cells do recognise and how the immunological answers is formed. By solving the secrets of the immunological system, oto-immunological, allergic diseases and cancer would be able to be treated easier it is possible that much more better results will be able to be reached with organ transformation.
