Clinical and microbiological study of bacterial contamination of frequently used dental impression materials

Mass distribution of different infectious diseases appears even more likely in dentistry than other medical specialities. The purpose of the study is to examine different impressions with alginate materials in order to demonstrate the contamination with different pathogens. Material and method. 63 patients were included in this study. They required specific prosthetic treatment. Preliminary impression were obtained with irreversible hydrocolloid material and microbiologically tested shorthy after removal from the mouth, after washed throughly with cold water and after decontamination with specific desinfectants. Results. Microbiologic records on the alginate impressions in different stages, revealed a reduction in number of bacteria, but not completely absence, regardless of the type of decontamination substance. Conclusions. The presence of different pathogens on the surface of irreversible hydrocolloid impresions is certain. There are residual bacteria which differ from one substance to another, irrespective of cleaning stages and decontamination materials used in daily manipulation of dental impresion. Even if time consuming, decontamination of alginate impression is compulsory in dentistry.

Download Full-text

Marginal adaptation of provisional crowns made of acrylic and bisacrylic resins using different impression materials

Brazilian Journal of Oral Sciences ◽

10.20396/bjos.v18i0.8657257 ◽

2019 ◽

Vol 18 ◽

pp. e191603

Author(s):

Camilla Lopes Cerqueira ◽

Roniel Kappler ◽

Andrea Araújo Nobrega Cavalcanti ◽

Emilena Maria Castor Xisto Lima

Keyword(s):

Marginal Adaptation ◽

Tukey Test ◽

Prosthetic Materials ◽

Acrylic Resins ◽

Impression Materials ◽

Direct Technique ◽

Significant Difference ◽

Irreversible Hydrocolloid ◽

Marginal Discrepancy ◽

Materials Used

Aim: To evaluate the marginal adaptation of provisional crowns made of acrylic and bisacrylic resins using different impression materials. Methods: a metal die and a matrix applied through a direct technique were used to fabricate the specimens. The impression materials used as a matrix were divided into four groups: Irreversible hydrocolloid (IH), laboratory silicone (LS), condensation silicone (CS), and addition silicone (AS). After the impression procedures, each matrix was loaded with the provisional prosthetic materials, Alike, Duralay, Protemp 4, and Structur 3 (n = 12). Marginal discrepancy was evaluated using a stereomicroscope at ×45 magnification. The images obtained were transferred to the Corel Draw X7 program, and the distances from the cervical margins of the specimen to the reference lines at the metal die were measured vertically. The data were analyzed by using 2-way ANOVA followed by the Tukey test (α=.05). Results: the acrylic resins had higher values of marginal discrepancy compared to the bisacrylic resins. A statistically significant difference was found between all impression materials, and the irreversible hydrocolloid presented higher values of discrepancy (303.28–613.31 μm), whereas addition silicone had the lowest (48.61–190.06 μm). Conclusions: the bisacrylic resins had a better marginal adaptation compared to the acrylic resins. The addition silicone promoted a better marginal adaptation of the provisional prosthetic materials tested, followed by condensation silicone, laboratory silicone, and irreversible hydrocolloid.

Download Full-text

Detection and enumeration of the dangerous food borne pathogens in cooked food that causes food poisoning and infectious diseases

MATEC Web of Conferences ◽

10.1051/matecconf/201819203009 ◽

2018 ◽

Vol 192 ◽

pp. 03009

Author(s):

Sumonthip KongtunJanphuk

Keyword(s):

Infectious Diseases ◽

Bacterial Contamination ◽

Gastrointestinal Disease ◽

Food Poisoning ◽

Food Borne Pathogens ◽

University Of Technology ◽

Food Borne ◽

Cooked Food ◽

Number Of Bacteria ◽

Different Levels

This research was aim to analyzed the detection and enumeration of the dangerous food borne pathogens in cooked food that causes food poisoning and infectious diseases from the restaurants surround area of King Mongkut’s University of Technology North Bangkok, Bangkok, THAILAND. Pot-stewed pork (Palow-Moo;PL) and Fried basil pork (Kapraw-Moo;PK) from five restaurants were collected and analyzed for food borne pathogens. The Analysis of bacterial contamination in that food by used to the methodology of Microbiology and diagnosis bacteria by Biochemistry methodology. The result were indicated that the cooked food from five restaurants contaminated with bacteria caused the risk of gastrointestinal disease as follows : PL dishes the microorganisms were founded between 1×105 to 3×108 colony/gram, MPN values in the ranges of Escherichia coli were infected < 3 to 64 and MPN values of Staphylococcus aureus < 3 to 43. There were founded Salmonella spp. 5 samples, Pseudomonas aeruginosa 4 samples, Shigella spp. 4 samples, Bacillus cereus 2 samples, Proteus spp. 2 sample and Micrococcus spp. 1 sample. In the PK dished, the total number of bacteria were founded between 5×103 to 2×108colony/gram, MPN values in the range of E.coli and S.aureus were infected < 3 to 39 and < 3 to 28. The results showed that the cooked food from five restaurants are contaminated with bacterial caused food poisoning and the risk of gastrointestinal diarrhea at the different levels.

Download Full-text

Survey of current materials and impression techniques for Complete Dentures among Nepalese Prosthodontists

Journal of College of Medical Sciences-Nepal ◽

10.3126/jcmsn.v14i2.20242 ◽

2018 ◽

Vol 14 (2) ◽

pp. 75-80

Author(s):

Amar Bhochhibhoya ◽

Binod Acharya ◽

Samskar Bickram Rana ◽

Rinu Sharma ◽

Jemish Acharya ◽

...

Keyword(s):

Acrylic Resin ◽

Complete Denture ◽

Complete Dentures ◽

Medical College ◽

Institutional Review ◽

Impression Materials ◽

Ethical Approval ◽

Irreversible Hydrocolloid ◽

Removable Prosthesis ◽

Materials Used

ABSTRACTBackground: Impression making is one of the critical factors in determining success or failure of complete denture therapy. The precise reproduction of edentulous foundation is essential for retention, stability, and support of the removable prosthesis. Evidence suggests that there is variability in materials and techniques regarding impressions making for complete dentures. There is little published information on studies conducted among Nepalese Prosthodontists. The purpose of this study was to evaluate current materials andmethods for impressions for complete denture prosthodontics in Nepal. Materials & Methods: A questionnaire based survey was conducted among Nepalese Prosthodontists. Ethical approval for the beginning of the study was obtained via Institutional Review Committee, Nepal Medical College. A self-administered anonymous questionnaire was distributed to the participants. Data were analyzed by using frequency distribution.Results: Majority of responses indicated use of irreversible hydrocolloid in stock metal tray for making the preliminary impression. The selective pressure was the predominantly used impression philosophy (78.3%). The most common material for the fabrication of custom trays was autopolymerizing acrylic resin (96.7%). All respondents border molded the custom tray prior to making the final impression. The final impression materials used were zinc oxide eugenol impression paste (73.3%), polyvinylsiloxane (11.7%), polyether (11.7%) and polysulphide (3.3%). Conclusion: Although there is variability in impression materials andtechniques used by Prosthodontists in Nepal for the fabrication of complete dentures, the results showed interesting trends. Most practitioners followed the traditional techniques of complete denture impression procedures.Keywords: complete denture; custom tray; edentulism; impression.

Download Full-text

Rheological Properties of Some Materials Used for Dental Impression

Journal of Biomimetics Biomaterials and Biomedical Engineering ◽

10.4028/www.scientific.net/jbbbe.34.75 ◽

2017 ◽

Vol 34 ◽

pp. 75-81

Author(s):

Mihaela Păpușa Vasiliu ◽

Liliana Sachelarie ◽

Laura Ecaterina Romila ◽

Ardeshir Shardi ◽

Carmen Stadoleanu ◽

...

Keyword(s):

Rheological Properties ◽

Loss Modulus ◽

Complex Viscosity ◽

Gel Structure ◽

Long Period ◽

Impression Materials ◽

Dental Impression ◽

Medium Time ◽

Materials Used ◽

The Stability

The dimensional stability of dental impression materials is one of the variables that contribute to the accuracy or to the inexactitude of dentures. The rheological properties of several dental impression materials were determined by amplitude and frequency sweep tests. Deformation, storage modulus G’, loss modulus G” and complex viscosity η*were studied for each sample. Moreover, the texture, the stability of the shape, the capacity of distribution on different surfaces and the stability to storage for a long period of time were investigated. All these samples, characterized by a gel structure with G’>G”, are suitable as impression materials. Irreversible hydro-colloids) may be used for different kind of impressions because of their fidelity and elasticity; they also present medium time elasticity and may be easily prepared.

Download Full-text

Physical properties of irreversible hydrocolloid dental impression materials obtained from brown algae species Padina sp.

Journal of Physics Conference Series ◽

10.1088/1742-6596/1073/5/052018 ◽

2018 ◽

Vol 1073 ◽

pp. 052018

Author(s):

N Hamrun ◽

B Thalib ◽

D Tahir ◽

Asmawati ◽

A M Hamudeng ◽

...

Keyword(s):

Physical Properties ◽

Brown Algae ◽

Impression Materials ◽

Irreversible Hydrocolloid ◽

Dental Impression

Download Full-text

Deficiencies in Silicone Impression for Crowns and Bridges

Revista de Chimie ◽

10.37358/rc.17.10.5876 ◽

2017 ◽

Vol 68 (10) ◽

pp. 2317-2319

Author(s):

Claudia Florina Andreescu ◽

Oana Botoaca ◽

Horia Mihail Barbu ◽

Doina Lucia Ghergic ◽

Anamaria Bechir ◽

...

Keyword(s):

Dental Practice ◽

Present Study Deal ◽

Dental Crowns ◽

Impression Materials ◽

Dental Practitioners ◽

Adequate Quality ◽

Dental Impression ◽

Single Crowns

There are many steps in fabrication of dental crowns and bridges at which an error can occur, and a technician can only fabricate a quality restoration if the impression itself is of adequate quality. All dental practitioners should have the ability to evaluate the quality of dental impression before sending to the laboratory. Elastomeric silicones (polysiloxane) are the most utilised impression materials in dental practice. The present study deal with the deficiencies of silicones dental impressions sent to commercial dental laboratories for fabrication of single crowns and bridges.

Download Full-text

The use of vinyl polysiloxanes and quick setting epoxies in paleontology

Journal of Paleontology ◽

10.1017/s002233600001934x ◽

1989 ◽

Vol 63 (2) ◽

pp. 256-256 ◽

Cited By ~ 1

Author(s):

Patrick Leiggi

Keyword(s):

Fast Method ◽

Impression Material ◽

Impression Materials ◽

Dental Impression

Quick setting dental impression materials are nothing new in the paleontology laboratory. In a paleontological note published in the Journal of Paleontology on “The Use of Dental Impression Material For Molding Macrofossils” (Quilty & Williams, 1975), the products Xantopren and Optosil were introduced as a simple and fast method of obtaining precision molds in 1-3 minutes. Since the mid-1970's these products have been replaced by vinyl polysiloxanes.

Download Full-text