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Silicone attachment for avoidance of bone tissue overloading in single implant-retained denture

100%

Żmudzki J. , Chladek G. , Kasperski J.

tom Vol. 51, nr 2

107-115

Purpose: The application of single implant-retained dentures (SIDs) is still rare. It seems that the reason of that is the fear of the overloading of a bone tissue around the implant that alone bears the occlusal loads. In this paper, stress level in the bone tissue around the single mini-implant that alone retained the lower denture was investigated. This stress level depends on the denture joint (the attachment) to the implant. Design/methodology/approach: 3D finite element method (FEM) analysis was used in order to determine the transmission of occlusal loads between mucous membrane foundation and the bone tissue around small diameter (1.8 mm) implant. Standard rotationally and axially mobile denture attachments were compared with the laterally compliant silicone attachment. Oblique mastication loads were assumed for the purposes of a better simulation of realistic conditions. Findings: Both types of standard attachments, rotationally and axially mobile, born remarkable values of oblique mastication force. This load results in a high stress in the bone tissue around a single mini-implant, in the area convergent with clinically observed “funnel-shaped” marginal bone loss around the implant neck. The silicone attachment reduced the loading to a level, which did not create any stress that would be dangerous for the bone tissue. Research limitations/implications: In the FEM model a perfect denture adherence to mucous foundation was assumed and a perfect joint between the implant and bone tissue. Further simplification were the linear isotropic characteristics of used materials. Practical implications: The use of single mini-implants requires the highest quality of the alloy and surface finishing due to the risk of fatigue cracks in case of a quickly progressing “funnel-shaped” bone loss. The silicone attachment provided better utilization of the mucous membrane support that significantly improves safety of implant and diminishes the requirements of bone foundation conditions for an implantological treatment. Originality/value: Presented was a possibility to achieve a much more reliable SID by means of used silicone attachment.

Copper, phosphorus and calcium in bovine blood and seminal plasma in relation to semen quality

100%

Machal L. , Chladek G. , Strakova E.

nr 3

Effects of magnetostimulation on muscle activity and pain in edentulous adults with temporomandibular disorders

88%

Rój R. , Chladek G. , Wyszyńska M. , Morawiec T. , Kasperski J.

tom Vol. 20, no. 2

89--99

Introduction: Multifactorial aetiologies of painful temporomandibular disorders (TMD) have an impact on correct diagnosis and consequently prevent proper treatment. Aim of the study: The aim of the study was to evaluate the effect of magnetic stimulation on electromyographic activity in temporal muscles and masseters in patients using occlusal splints. Materials and methods: The examined group consisted of 40 edentulous patients with TMD. The patients were examined based on Helkimo Index. Next, electromyographic activity of the temporal muscle and masseter were investigated using 8-channel surface electromyography. All patients received acrylic occlusal splints for 12 weeks. The group qualified for the study included 20 randomized patients, whose therapy was additionally carried out by extremely low-frequency magnetic fields for a period of 21 days. Following examinations were conducted after 3, 6 and 12 weeks with surface electromyography recording of the examined muscles. Patients received occlusal splint corrections using the T-Scan III system. The clinical evaluation of TMD was analysed using Helkimo index and VAS scale before and after the treatment. All the data were analysed using Statistica 12.5 PL. Results: Patients with combination therapy had lower asymmetry of temporal muscle activity. Conclusions: Combination therapy using magnetic stimulation reduced intensity of pain in patients with TMD and decreased values of the Helkimo indices.

Dairy traits of the progeny of Red-and-White bulls described through the genetic polymorphism of milk proteins and principally of fraction alphaS1-CN

75%

Dobicki A. , Walawski K. , Chladek G. , Nowopolska A. , Koliski W. , Zachwieja A.

nr 1