Noise factor and reception bandwidth in optoacoustical GW antenna

An expression has extracted from the OGRAN project theory, which provides connection between numerical values of noise factor F and achieved displacement resolution and antenna’s threshold signal in metric variations. Noise factor and “reception bandwidth” connects across displacement resolution. There is defined analytical expression and numerical value for design displacement resolution (sensitivity) on the base intention F = 1. It has appeared that the extracted analytical expression for readout resolution does not correspond to applied Pound-Drever-Hall technique and AURIGA circuitry. This requires an improvement in theoretical design. The achieved resolution value 2·10−15 cm/Hz1/2 is matched to the value for metric sensitivity in pulse hmin ≃ 10−18, which is 15 dB higher than the thermal sensitivity limit.

Preformed metal crowns placed by Hall technique for restoring primary molars have an optimal survival? - a Systematic Review and Meta-analysis protocol

Background: Unsuccessful restorative treatment of carious lesions in deciduous molars remains a priority for clinicians to resolve when caring for children's dentition. However, regardless of the material or technique used, standard restorative treatments continue to fail and present low survival rates. In an effort to solve these problems, a non-invasive technique known as the Hall Technique was developed with reduced adverse effects and is being studied over the last years, presenting great success in comparison with other restorative techniques. Thus, this systematic review and meta-analysis aim to address the question concerning the survival of preformed metal crowns using the Hall Technique for restoring deciduous molars.Methods: Electronic databases and other sources, such as gray literature will be searched. Randomized controlled trials (RCTs), and Non-Randomized studies of interventions (NRSI) will be included that assess the use of preformed metal crowns using the Hall Technique on primary molars. The outcome will be the cumulative survival rate of preformed metal crowns applied according to the Hall Technique. Two independent reviewers will perform screening, study selection, data extraction, risk of bias, and certainty of evidence assessment. Any discrepancies in opinion will be resolved by a third reviewer who is considered to be an expert in the field. Assessment of the risk of bias of included studies will be evaluated by RoB 2 and ROBINS-I tools. The certainty of evidence will be determined using the GRADE tool. Methodological heterogeneity across studies will be evaluated to determine the best model for the meta-analysis.Discussion: To the best of our knowledge, no systematic review has addressed this gap directly. Findings obtained from the review will be valuable in the decision-making process regarding the use of Hall Technique preformed metal crowns for restoration of decayed primary molars.

Teaching Minimally Invasive Interventions in Paediatric Dentistry: A Cross-Sectional Survey of Dental Schools in Iran

Background Dental caries is a significant public health problem in Iran. Teaching minimally invasive interventions in paediatric dentistry may facilitate the provision of treatment for untreated dental caries in children. We evaluated the teaching of such interventions in both undergraduate dental curriculum and Paediatric Dentistry Specialty Training Programme (PDSTP) in Iran. Methods This was a cross-sectional questionnaire-based survey. Participants in this study were the directors of 40 undergraduate programmes and 15 PDSTPs in all Iranian dental schools (response rate = 100%). Descriptive statistics were reported. Results The most commonly taught methods were preventive fissure sealant and preventive resin restoration (PRR), which were taught ‘both didactically and clinically’ in all undergraduate dental programmes. The least commonly taught methods were silver diamine fluoride (SDF), the Hall technique and resin infiltration, which were taught ‘both didactically and clinically’ in less than 5% of dental schools. The same three methods were the least commonly approaches taught in PDSTP, further, they were less often perceived to be ‘essential’. Conclusions There was a notable variation in the teaching of the management of dental caries in Iran’s dental education. Some minimally invasive approaches including SDF, the Hall technique and resin infiltration are not being commonly taught in Iranian dental schools despite the evidence base for these techniques.

Modified Hall technique for severely hypomineralized molars. Report of cases

This article reviews the indications, objectives and step by step process of the Modified Hall Technique in the management of primary and permanent molars affected by severe enamel hypomineralization. Scientific based biological principles are discussed in order to provide relevant clinical information for Pediatric and General dentists in order to provide support for the safe use the technique in clinical practice.