EUROPEAN JOURNAL OF
PHARMACEUTICAL AND MEDICAL RESEARCH

( An ISO 9001:2015 Certified International Journal )

An International Peer Reviewed Journal for Pharmaceutical, Medical & Biological Sciences

An Official Publication of Society for Advance Healthcare Research (Reg. No. : 01/01/01/31674/16)

European Journal of Pharmaceutical and Medical Research (EJPMR) has indexed with various reputed international bodies like : Google Scholar , Indian Science Publications , InfoBase Index (In Process) , SOCOLAR, China , Research Bible, Fuchu, Tokyo. JAPAN , International Society for Research activity (ISRA) , Scientific Indexing Services (SIS) , Polish Scholarly Bibliography , Global Impact Factor (GIF) (Under Process) , Universal Impact Factor , International Scientific Indexing (ISI), UAE  , Index Copernicus , CAS (A Division of American Chemical Society) USA (Under Process) , Directory of Open Access Journal (DOAJ, Sweden, in process) , UDLedge Science Citation Index , CiteFactor , Directory Of Research Journal Indexing (DRJI) , Indian citation Index (ICI) , Journal Index (JI, Under Process) , Directory of abstract indexing for Journals (DAIJ) , Open Access Journals (Under Process) , Impact Factor Services For International Journals (IFSIJ) , Cosmos Impact Factor , Jour Informatics (Under Process) , Eurasian Scientific Journal Index (ESJI) , International Innovative Journal Impact Factor (IIJIF) , Science Library Index, Dubai, United Arab Emirates , Pubmed Database [NLM ID: 101669306] (Under Process) , IP Indexing (IP Value 2.40) , Web of Science Group (Under Process) , Directory of Research Journals Indexing , Scholar Article Journal Index (SAJI) , International Scientific Indexing ( ISI ) , 

 ISSN 2394-3211

Impact Factor: 6.222

 ICV - 79.57

Abstract

COMPARATIVE EVALUATION OF SURFACE HARDNESS OF TYPE IV GYPSUM PRODUCT USING THREE DIFFERENT DIE HARDENERS: AN IN – VITRO STUDY

Dr. Nimra Mehraj*, Dr. Samiksha Arora and Dr. Shobhit Garg

ABSTRACT

Statement of the problem: A die, commonly made of Type IV gypsum, should be dimensionally stable, hard and resistant to inadvertent abrasion caused during its fabrication. To increase the surface hardness, coating of die hardners has been recommended. But no conclusive data is available as some authors stated that the surface hardness increases while others were in view that it decreases or shows no effect on application die hardeners. Hence, this study was undertaken to evaluate and compare the surface hardness of Type IV gypsum products using different die hardeners. Materials & Method: A total of 60 samples, divided into four groups, were fabricated from the mould prepared by impression of the master die. Group I, II and III were treated with different types of die hardeners whereas, Group IV (control) was not treated with any type of die hardener. Micro Vickers hardness test was then conducted for the evaluation of surface hardness. Results: Statistically significant results (P<0.05) were found for surface hardness evaluation after the application of different die hardeners. Mean Surface hardness was highest with the control group followed by samples treated with mixture of vinyl and natural resins, Cyanoacrylate esters blended with acetone and least was seen with solution of phthalate resin. Conclusion: Die hardener coating applied on Type IV gypsum product decreases the surface hardness.

Keywords: Statement of the problem: A die, commonly made of Type IV gypsum, should be dimensionally stable, hard and resistant to inadvertent abrasion caused during its fabrication. To increase the surface hardness, coating of die hardners has been recommended. But


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Google Scholar Indian Science Publications InfoBase Index (In Process) SOCOLAR, China Research Bible, Fuchu, Tokyo. JAPAN International Society for Research activity (ISRA) Scientific Indexing Services (SIS) Polish Scholarly Bibliography Global Impact Factor (GIF) (Under Process) Universal Impact Factor International Scientific Indexing (ISI), UAE Index Copernicus CAS (A Division of American Chemical Society) USA (Under Process) Directory of Open Access Journal (DOAJ, Sweden, in process) UDLedge Science Citation Index CiteFactor Directory Of Research Journal Indexing (DRJI) Indian citation Index (ICI) Journal Index (JI, Under Process) Directory of abstract indexing for Journals (DAIJ) Open Access Journals (Under Process) Impact Factor Services For International Journals (IFSIJ) Cosmos Impact Factor Jour Informatics (Under Process) Eurasian Scientific Journal Index (ESJI) International Innovative Journal Impact Factor (IIJIF) Science Library Index, Dubai, United Arab Emirates Pubmed Database [NLM ID: 101669306] (Under Process) IP Indexing (IP Value 2.40) Web of Science Group (Under Process) Directory of Research Journals Indexing Scholar Article Journal Index (SAJI) International Scientific Indexing ( ISI )