Extreme stresses in surrounding bone are among the most important reasons for implant failure. Bone density (quality) is a variable that plays a decisive role in achieving predictable osseointegration and long-term survival of implants. The magnitudes of ultimate occlusal load, which generate ultimate von Mises stress at the critical point of peri-implant area for the spectrum of implants inserted into mandible with four different bone qualities (Lekholm and Zarb classification), were calculated. Geometric models of mandible segment were generated from computed tomography images and analysed with osseointegrated cylindrical implants of various dimensions. Occlusal loads were applied in their natural direction. All materials were assumed to be linearly elastic and isotropic. The investigation suggests that an implant's ultimate occlusal load indicates its load-carrying capacity. As a result, bone loss can be predicted, and viable implants can be selected by comparing the values of their ultimate occlusal load in different clinical conditions.
Dental implant failure is mainly the consequence of bone loss at peri-implant area. It usually begins in crestal bone. Due to this gradual loss, implants cannot withstand functional force without bone overload, which promotes complementary loss. As a result, implant lifetime is significantly decreased. To estimate implant success prognosis, taking into account 0.2 mm annual bone loss for successful implantation, ultimate occlusal forces for the range of commercial cylindrical implants were determined and changes of the force value for each implant due to gradual bone loss were studied. For this purpose, finite element method was applied and von Mises stresses in implant-bone interface under 118.2 N functional occlusal load were calculated. Geometrical models of mandible segment, which corresponded to Type II bone (Lekholm & Zarb classification), were generated from computed tomography images. The models were analyzed both for completely and partially osseointegrated implants (bone loss simulation). The ultimate value of occlusal load, which generated 100 MPa von Mises stresses in the critical point of adjacent bone, was calculated for each implant. To estimate longevity of implants, ultimate occlusal loads were correlated with an experimentally measured 275 N occlusal load (Mericske-Stern & Zarb). These findings generally provide prediction of dental implants success.
Питання фізіотераПії. Лекція Medicine of middle ages. Religion. Philosophy. Superstitions Prof. А. А. Oparin Kharkiv medical academy of poctgradutation education It is shown in the article, that in middle ages the sanitary-epidemiology state was characterized by absence of the system of the sewage system and water-supply; by a complete insanitariness, both city on the whole and separate houses; by absence of elementary rules of the personal hygiene; by the high percent of child's death rate and almost not ceasing epidemics. It is shown that medicine in the epoch of middle ages based on principles of схоластики, rejecting in principle any scientific openings and contrasting a faith and science, that did her development impossible in principle. Methods treatments, applied by medieval medicine, were based on rough superstitions, taken to the faith in curative force of amulets and talismans; ascription of influence on the health of man of location of stars; to the role of plots and healthful force of the pounded stones and minerals. It is in-process set that basis of medieval medicine was made first of all by учения of medieval church about immortality of the soul, saints, at illnesses, rough heathen beliefs and philosophy, doing not only impossible development of medicine, as such but also resulting in mass epidemics, insanitariness, height of neuropsychic diseases, decline of duration and quality of life of population, predominated in which.
The effectiveness of the analgesic impact of magnetic-laser therapy (MLT) and its combinations with other methods with have a aproved analgesic effect used for multidisciplinary rehabilitation of patients with chronic nonspecific dorsalgia (CNSD) with marked pain syndrome in a polyclinic has been studied. 107 patients with high intensity pain syndrome (on a VAS scale from 6 to 8 points is severe pain) in CNSD exacerbation phase were included. The patients were divided into five homogeneous groups. All patients were treated with kinesiotherapy (KT). In addition, patients of the 1st group were treated with MLT; patients of the 2nd group were treated with sinusoidal modulated currents (SMT); patients of the 3rd group were treated with ultraphonophoresis with non-steroidal anti-inflammatory drugs (UPP NSAID); patients of the 4th group were treated with complex of MLT and SMT; patients of the 5th group were treated with MLT and UPP NSAID. Pain dynamics was assessed using VAS, while patient functional capabilities - using FAS-9 questionnaire. MLT application in 1st group patients decreased pain and altered functions very slightly (p>0.05). Ten sessions of SMT or UPP together with KT caused transition of severe pain to moderate - from (5.67±0.37) to (3.30±0.26) and from (5.75±0.34) to (3.72±0.31) points, respectively (p<0.001), which allowed to increase significantly the activity of KT. MLT and SMT combination after 8 sessions has caused two-fold pain decrease – from (5.96±0.39) to (2.82±0.25) points (p<0.001) and significantly improved movement biomechanics. SMT or UPP combination with MLT potentiates antinociceptive effect of both modalities, so patient functional capabilities regenerate earlier. This fact allows to apply KT from the first day of rehabilitation, which leads to the reduction of rehabilitation time.
Keywords: chronic non-specific dorsalgia, multidisciplinary rehabilitation, kinesiotherapy, magnetic- laser therapy, sinusoidal modulated currents, NSAID ultraphonophoresis.
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