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.

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.

Introduction. The therapeutic approach of deep carious lesions in the temporary teeth represents an extremely complex problem for pediatric dentists, both in terms of their instrumentation and in terms of collaboration with children in specialized treatment, but also with their parents. Purpose. In this material we tried to present as briefly as possible the role of the pediatric dental specialist in the treatment of deep carious lesions existing in the temporary dentition. Material and method. The study was carried out with the help of 41 dentists in Romania, from September 10 to October 10, 2019. Results and discussions. Centralized responses create a clear picture of how practitioners understand the importance of dental caries treatment in temporary teeth. Conclusions. Maintaining temporary teeth on the arches until the eruption of the definitive counterparts, plays an important role in maintaining the length and shape of the dental arches, as well as in preventing the occurrence of malocclusions.

Nowadays, at work, many people spend more than half of their entire day working in a sitting position. Maintaining this position for a long period of time is a risk factor for health. The results of various studies have shown associations between maintaining a prolonged sitting position with morbidity due to chronic diseases, such as cardiovascular disease, diabetes, metabolic syndrome, obesity, etc. And, as we have already mentioned in the first part of this study, dental technicians are part of this category of staff, who carry out most of their specific activity, in a sitting position.

Specifically, maintaining a prolonged sitting position is considered to be associated with an increased risk of musculoskeletal disorders in the back, neck, shoulders, arms, hands, hips, knees and legs. The purpose of this study is to generate data, which can be used to support decisions on improving the health of dental technicians, whose basic activity is carried out in a sitting position at the work table, in order to improve the quality of life. Implementation of ergonomic measures, in the area where professional activities directly affect the physical and mental health of the employee, is of great importance.