Purpose of the study: The aim of the study is to analyze the way the disinfectants embedded in the plaster affect the setting linear dimensional stability, flexural and compressive strength of dental stone models. Material and Methods: Samples were made of type IV dental stone in which different disinfectants had been incorporated (sodium hypochlorite 1%, chlorhexidine 2%) in two concentrations (50%, 100%), thus obtaining four test groups. Mentioned parameters are measured using a micro comparison device and an universal testing machine, analyzing statistically the results in comparison with the control group, prepared by standard indications. Results: Disinfectants cause a decrease of the setting expansion value (ΔL) compared to the standard group in all type of mixing percentage. Variations of compressive and flexural strength are statistically significant, particularly when adding 100% of hypochlorite 1%. Conclusions: Within the limits of this study, replacing the distilled water with disinfectants, alter the value of setting expansion and cause the model dental stone to be brittle in compression and bending.
Due to its considerable systemic impact, several local and general methods to control surgical ( intra/perioperative) bleeding have been developed, with particular characteristics adapted to each type of surgery. In orthopaedic procedures, elective or urgent, bleeding is to be seriously considered , since usually both bones and soft tissues are injured or cut, so adapted haemostatic means have to be used. This issue is of particular importance especially when very small vessels are involved, and especially on large surfaces, since ligation or cauterization are useless in these situations. An effective tool in these circumstances is the group of fibrin sealants, which can stop diffuse bleeding on surfaces when produced by very small vessels. The authors present their clinical experience with fibrin sealants, underlining the indications and the limits of the method.
In this paper are highlighted the stresses that appear in the peri-implantation area through the forces induced by the masticatory process. The analysis consists of computer modeling of the dental implant and simulation of the load with a distributed force. It is considered a variable direction loading related to the axial insertion of the dental implant, thus simulating an important masticatory process. This type of load reveals stresses developed in the periimplantary bone area, the risk areas where the stresses can cause the appearance of hard tissue damage near the implant and its failure. Increases in stresses up to 159% in the ruminant type of chewing compared with the cutter type are highlighted. An aggravating factor that can lead to implant failure is bruxism that tangentially stresses the implant leading to the concentration of forces at the abutment-implant junction. Conclusions regarding the decrease of stresses at bone-implant junction with up to 23% by a corresponding increase of the implant diameter by 25% are also issued.
Professionals from different fields are exposed to myo-arto-kinetic disorders, among them those in the medical field with dental profile, respectively dentists, dental assistants and dental technicians. Given that specialists in the field of dentistry are exposed to musculoskeletal risk factors with cervical location, the purpose of this study is to provide data to contribute to an effective kinetic intervention strategy for professionals working in the field of dentistry.
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