Quantcast Properties of Zinc Phosphate Cement - Dental Materials

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
 
1-12. PROPERTIES OF ZINC PHOSPHATE CEMENT
a. Advantages. Some advantages of zinc phosphate cement as a cementing
medium are:
(1)
Inconspicuous appearance.
(2)
Speed and ease of usage.
(3)  Sufficient flow to form a thin layer for the cementing of closely adapted
crowns, fixed partial dentures, and inlays.
(4)
Low thermal conductivity beneath a metallic restoration.
b. Disadvantages. Some disadvantages of zinc phosphate cement as a
cementing medium are:
(1)
Low crushing strength that varies between 12,000 and 19,000 psi.
(2)
Slight solubility in mouth fluids.
(3)
Opaque material not suitable for visible surfaces.
c. Strength. The ratio of powder to liquid increases the strength of phosphate
cements to a certain point. For this reason, the dental specialist must use as thick a mix
as practical for the work being performed.
1-13. SETTING REACTIONS OF ZINC PHOSPHATE CEMENT
a. Chemical Reaction. The chemical reaction that takes place between the
powder and liquid of setting phosphate cement produces heat. The amount of heat
produced depends upon the rate of reaction, the size of the mix, and the amount of heat
extracted by the mixing slab.
b. Powder to Liquid Ratio. The less powder used in ratio to the liquid, the
longer the cement will take to harden. Good technique minimizes the rise in
temperature and acidity of the setting cement that can injure the pulp. Generally, for
increased strength, decreased shrinkage, and resistance to solubility, it is advisable to
blend as much powder as possible to reach the desired consistencies.
c. Setting Time. The setting time of zinc phosphate cement is normally
between 5 and 9 minutes. Four actions that may be taken to maintain and prolong the
normal setting time are given below.
MD0502
1-12



Medical News
Researchers show value of tissue-engineering to repair major peripheral nerve injuries
Peripheral nerve injury (PNI) is a common consequence of traumatic...
medicalxpress.com
Ebola: timeline of a ruthless killer
Here are key dates in the current Ebola epidemic, the...
medicalxpress.com
Chile's Bachelet sends abortion bill to Congress
Chile's President Michelle Bachelet on Saturday pressed ahead with plans...
medicalxpress.com
Scientist considered father of birth control pill dies
Carl Djerassi, the chemist widely considered the father of the...
medicalxpress.com
PodMed: A Medical News Roundup From Johns Hopkins (with audio)
(MedPage Today) -- This weeks topics include tight control of...
medpagetoday.com
Mixed Results for Obamacare Tests in Primary-Care Innovation
(MedPage Today) -- Achieving the programs' goals turns out to...
medpagetoday.com
Grand Roundup: Top posts of January
The five most-read stories this month on Scope were: Eating...
scopeblog.stanford.edu
D.C Week: Administration Pushes Ahead on Multiple Fronts
(MedPage Today) -- More details on "precision medicine" and health...
medpagetoday.com
RA Mortality High but Improving (CME/CE)
(MedPage Today) -- Mortality rate gap between RA patients and...
medpagetoday.com
Rock, Paper, Lizards? That's Improbable!
(MedPage Today) -- The science of being drunk, and skepticism...
medpagetoday.com
Ebola reveals shortcomings of African solidarity
As Africa's leaders meet in Ethiopia to discuss the Ebola...
medicalxpress.com
Vyvanse OK'd for Binge Eating
(MedPage Today) -- FDA gives green light for new indication...
medpagetoday.com
Abuse-Deterrent Zohydro OK'd
(MedPage Today) -- FDA approves new version of controversial hydrocodone...
medpagetoday.com
Stress balls, DVDs and conversation ease pain and anxiety during surgery
Being conscious during an operation can make patients feel anxious...
medicalxpress.com
This Week: Medicare Payment Models, Meaningful Use, Measles
(MedPage Today) -- Headlines from this week in medical news,...
medpagetoday.com
President Promotes ?Patient-Powered? Genomics Project
(MedPage Today) -- Obama shares details of Precision Medicine Initiative...
medpagetoday.com
This is your brain on meditation
For years, friends have been telling me I should try...
scopeblog.stanford.edu
FDA approves ADHD drug for binge-eating disorder
Federal health regulators have approved an attention deficit disorder drug...
medicalxpress.com
Researchers reveal how pancreatic cancer cells sidestep chemotherapy
Pancreatic cancer is one of the deadliest forms of the...
medicalxpress.com
Tired Nurses, Needless Tests: Healthcare Career Insights
(MedPage Today) -- Must reads about the latest news and...
medpagetoday.com
 


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +