In vitro study of Coronal Leakage of Four Temporary Filling Materials Immersed in Alcoholic Methylene Blue Dye

Abstract Introduction: Temporary restorative materials are placed in access cavity to provide the coronal seal of the root canal during multi-visits RCT. This in vitro study was designed to evaluate the coronal microleakage of four different temporary restorative materials commonly used in endodontics in Myanmar, viz., MD.Temp, Orafil, Caviton, Zinc oxide eugenol. Materials and Methods : Forty-four extracted human premolars were selected, and access cavity was prepared. Pulp chambers were filled with wet cotton pellets leaving approximately 4 mm coronally. Forty teeth were randomly divided into four experimental groups equally. The remaining four teeth were equally divided into two control groups. Access cavities in each group were filled with one of the above tested materials, and immediately put into the water. Tooth surfaces except occlusal surface were then coated with nail varnish. Equal parts of 2% methylene blue and methylated alcohol were mixed to prepare a dye solution. Samples were immersed in dye for 10 days at 32 ± 2°C. Teeth were rinsed, dried, and sectioned mesiodistally and evaluated under a stereomicroscope at a magnification of 15X for linear dye penetration along cavity walls. Data were analyzed using KruskalWallis and Tukey HSD tests. Results : The lowest microleakage value was observed in MD.Temp and Orafil, and the highest in Zinc oxide eugenol (ZOE). Caviton was not statistically different from Orafil and ZOE, but significantly higher in microleakage than MD.Temp. Clinical Significance : ZOE which is dissolvable in alcohol was the least effective material for preventing microleakage, while MD.Temp and Orafil provided the best sealing in content of alcohol in this study

Which clinical and laboratory procedures should be used to fabricate digital complete dentures? A systematic review.

STATEMENT OF PROBLEM Digital workflows for digital complete denture fabrication have a variety of clinical and laboratory procedures, but their outcomes and associated complications are currently unknown. PURPOSE The purpose of this systematic review was to evaluate the clinical and laboratory procedures for digital complete dentures, their outcomes, and associated complications. MATERIAL AND METHODS Electronic literature searches were conducted on PubMed/Medline, Embase, and Web of Science for studies published from January 2000 to September 2022 and screened by 2 independent reviewers. Information on digital complete denture procedures, materials, their outcomes, and associated complications was extracted. RESULTS Of 266 screened studies, 39 studies were included. While 26 assessed definitive complete dentures, 7 studies assessed denture bases, 2 assessed trial dentures, and 4 assessed the digital images only. Twenty-four studies used border molded impression technique, 3 studies used a facebow record, and 7 studies used gothic arch tracing. Only 13 studies performed trial denture placement. Twenty-one studies used milling, and 17 studies used 3D printing for denture fabrication. One study reported that the retention of maxillary denture bases fabricated from a border-molded impression (14.5 to 16.1 N) was statistically higher than the retention of those fabricated from intraoral scanning (6.2 to 6.6 N). The maximum occlusal force of digital complete denture wearers was similar across different fabrication procedures. When compared with the conventional workflow, digital complete dentures required statistically shorter clinical time with 205 to 233 minutes saved. Up to 37.5% of participants reported loss of retention and up to 31.3% required a denture remake. In general, ≥1 extra visit and 1 to 4 unscheduled follow-up visits were needed. The outcomes for patient satisfaction and oral health-related quality of life were similar between conventional, milled, and 3D-printed complete dentures. CONCLUSIONS Making a border-molded impression is still preferred for better retention, and trial denture placement is still recommended to optimize the fabrication of definitive digital complete dentures

Development of Natural Language Processing based Communication and Educational Assisted Systems for the People with Hearing Disability in Myanmar

Information and communication technologies (ICTs) provide people with disabilities to better integrate socially and economically into their communities by supporting access to information and knowledge, learning and teaching situations, personal communication and interaction. Our research purpose is to develop systems that will provide communication and educational assistance to persons with hearing disability using Natural Language Processing (NLP). In this paper, we present corpus building for Myanmar sign language (MSL), Machine Translation (MT) between MSL, Myanmar written text (MWT) and Myanmar SignWriting (MSW) and two Fingerspelling keyboard layouts for Myanmar SignWriting. We believe that the outcome of this research is useful for educational contents and communication between hearing disability and general people

Green Synthesis of Zinc Oxide Nanoparticles Using Tropical Plants and Their Characterizations

Green synthesis is one of the most popular methods in nanotechnologies. Different tropical plants have a characteristic feature of medicinal effects that are associated with metallic nanoparticles present in the plants. Nanoparticles are used immensely due to its small size, orientation, physical properties, which are reportedly shown to change the performance of any other material which is in contact with these tiny particles. These particles can be prepared easily by different chemical, physical, and biological approaches. The green synthesis was done by using the aqueous solution of Neem(Azadirachta indica) leaf extracts and zinc nitrate solution as well as aqueous solution of Golden shower (Cassia fistula) leaf extracts and zinc acetate solution. Moreover, the synthesized zinc oxide nanoparticles were characterized by using ultraviolet-visible (UV-Visible) spectroscopy, Fourier Transform Infrared spectroscopy (FT IR), Energy Dispersive X-ray fluorescence (EDXRF), X ray Diffraction (XRD), and Scanning Electron Microscopy (SEM) analyses

Comparative Stuy of Anion Exchange Membranes Prepared by Brominated Polyphenyene Oxide Polymers

This research was designated to find out the solution for solving energy shortage problems of globe. There were three different brominated polyphenyleneoxide(BPPO) membranes such as 45% BPPO membrane, 35% BPPO membrane and 30% BPPO membrane that were prepared by dissolving BPPO polymer in dimethyl formamide (DMF) with the assistance of magnetic stirrer. Moreover, the prominent functional groups of each BPPO membranes were identified by Fourier Transform Infrared (FT IR) spectroscopy that informs the presence of distinct C-Br stretching band at 1019.66 cm-1. The Ion-Exchange Capacity (IEC) value of each membrane was determined by Mohr titration method where as 45% BPPO membrane gave 1.42 mmolg-1 IEC value which is a suitable result for Anion Exchange Membrane (AEM) and this value was highr than other two BPPO membranes. The resistance values of membranes were investigated by Multi-Meter that was related the conductivity of membranes and the swelling ratio, the solubility of each membrane were detected by dipping membranes in various solvents

Teeth Reconstruction Using Artificial Intelligence: Trends, Perspectives, and Prospects

ABSTRACTBackground Artificial intelligence (AI) applications in dental restorative procedures have significantly developed over recent years. However, there is a lack of documentation regarding the types of AI used in tooth reconstruction.Types of Studies Reviewed Studies using AI in tooth reconstruction were electronically searched over three databases PubMed, Cochrane library, and Google Scholar. The relevancy of theme tooth reconstruction was prioritized in searching. Only original research was included without the restriction of publication time or any filters.Results A total of 18 studies were included in this review: 5 reported programmable AI systems based on mathematical models such as statistical estimation, 9 studies used biogeneric tooth libraries, and 4 presented the deep learning models.Practical Implications AI has gained significant progress over the past two decades as a powerful tool for automated tooth reconstruction. However, further studies are required to compare different forms of AIs and to assess their clinical performance in the reconstruction of occlusal surfaces

Mandibular Two Mini Implants Overdenture Using Magnetic Attachments: A Case Report

<p><span class="fontstyle0">Many patients with an edentulous mandible struggle to use complete dentures. The instability of such dentures caused by the lack of retention, often causes discomfort, as well as functional and psychosocial problems, which can be signifcantly improved using implant overdentures with retentive attachments. This case report describes a successful case of a mandibular implant overdenture using two mini implants and magnetic attachments for an elderly edentulous patient. </span><span class="fontstyle2"><strong>Case Report</strong>: </span><span class="fontstyle0">A 62-year-old female with a thin mandibular bone ridge presented with complaints of pain caused by an unstable and unretentive complete mandibular denture. This patient received two mini implants (diameter: 2.6 mm; length: 12 mm) with magnetic attachments. After three months, magnetic assemblies with magnetic attraction of 400 gf were incorporated into the intaglio surface of her mandibular overdenture. At 11 months, magnetic attraction was changed from 400 gf to 600 gf to provide a stronger magnetic force for improving the retention of this denture. </span><span class="fontstyle2"><strong>Conclusion</strong>: </span><span class="fontstyle0">Based on a two-year follow-up period, the mandibular two mini implants overdenture with magnetic attachments was successful in improving the patient’s general satisfaction with her dentures</span> <br /><br /></p> <p><strong><span style="text-decoration: underline;"> </span></strong></p

A Systematic Review of the Use of mHealth in Oral Health Education among Older Adults

Oral diseases are largely preventable. However, as the number of older adults is expected to increase, along with the high cost and various barriers to seeking continuous professional care, a sustainable approach is needed to assist older adults in maintaining their oral health. Mobile health (mHealth) technologies may facilitate oral disease prevention and management through oral health education. This review aims to provide an overview of existing evidence on using mHealth to promote oral health through education among older adults. A literature search was performed across five electronic databases. A total of five studies were identified, which provided low to moderate evidence to support using mHealth among older adults. The selected studies showed that mHealth could improve oral health management, oral health behavior, and oral health knowledge among older adults. However, more quality studies regarding using mHealth technologies in oral health management, oral health behavior, and oral health knowledge among older adults are needed

Standardization of Mandalay Personality Type Survey

This study is an attempt to standardize Mandalay Personality Type Survey (MPTS). This scale is an attempt to measure personality, to assess three broad personality dimensions. These dimensions are (1) anti-social type (2) neuroticism and (3) pro-social type. The MPTS contains 180 items, which can be answered in Yes or No form. This scale was constructed by Dr.Htun Than & et al(2005). The reliability of the MPTS is .68 for anti-social, .71 for the neuroticism and .80 for pro-social. The validity of the MPTS is .31 for anti-social, .54 for the neuroticism and .62 for pro-social. The reliability and validity of MPTS is found to be satisfactory. Objectivity is one of the characteristics of a good test. For a test to be objective, it is necessary to assist the reliability, validity of the test and standardize it. By standardizing the test, it can interpret the test results or scores. Thus, the present study is fulfilled this requirement. In this study, „ T score ‟ was used as norms for MPTS. „T scores‟ equivalents for raw scores were presented in table (2). The T scores were classified into five levels. Although there are few limitations in the population sampling for pro-social personality scale, these norms can interpret an evaluation of his or her status in reference to other person. Therefore, these norms can be used for practical purpose in personnel selection