posted
Anyone have any idea what type of metal is used for dental crowns? Mine look like my regular teeth, so no clue there.
The next question is harder, what to do if they are bad, how are they replaced and with what?
I had all my amalgams removed several years ago and replaced with Cerex. No one mentioned anything about replacing crowns.
Thanks!
Posts: 125 | From US | Registered: Jul 2009
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stymielymie
Frequent Contributor (1K+ posts)
Member # 10044
posted
most crowns are porcelain baked onto a substrate of metal this metal can range from 22 kt gold , to non precious metal containing berillium and nickle,cadnium. these latter were used 20-15 years ago and are not biocompatable. in fact all three can cause cancer. cerec crowns can be made or also porcelain to porcelain can be made. also all gold crowns are fairly biocompatable also the post and core under the crown may need to be replaced,as many are amalgams
docdave
Posts: 1820 | From Boone and Southport, NC | Registered: Sep 2006
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stymielymie
Frequent Contributor (1K+ posts)
Member # 10044
posted
most crowns are porcelain baked onto a substrate of metal this metal can range from 22 kt gold , to non precious metal containing berillium and nickle,cadnium. these latter were used 20-15 years ago and are not biocompatable. in fact all three can cause cancer. cerec crowns can be made or also porcelain to porcelain can be made. also all gold crowns are fairly biocompatable also the post and core under the crown may need to be replaced,as many are amalgams
docdave
Posts: 1820 | From Boone and Southport, NC | Registered: Sep 2006
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bettyg
Unregistered
posted
hi doc dave,
we've missed you; added this link to my links of your teeth posts thanks my friend
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stymielymie
Frequent Contributor (1K+ posts)
Member # 10044
posted
some people are allergic to gold as per green band under rings. gold is the most inert metal and does react with other metals and chemicals but is the least reactive.
old crowns can be removed by slicing them off and removing them. i would not recommend any removal of any fillings or crowns without having a metal tox screen done. most people don't get better with amalgam removal and chelation.
dental work is expensive and should only be replaced if it is known to be the cause of a problem. pond raised fish have a very high mecury content. we just got a letter in nc stating not to eat more than one fish a month from local streams in the mountains and at the shore. so pick your poison.
docdave
Posts: 1820 | From Boone and Southport, NC | Registered: Sep 2006
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GiGi
Frequent Contributor (5K+ posts)
Member # 259
What is a metal allergy? What symptoms may be indicative of a metal allergy? Which metals can induce an allergy? In which every day items or medical products can sensitizing metals be found? Do certain occupations pose a special risk for inducing a metal allergy? In which fields of medicine does a metal allergy play an important role? How can a metal allergy be diagnosed? Is the MELISA� test medically validated, i.e., were MELISA� test results correlated with other parameters of a metal allergy (skin tests, etc.)? How does the MELISA� test work? What material is required for the MELISA� test? Can the blood samples be sent to a laboratory? How long does the MELISA� test take?
What is a metal allergy? Many every day metals can cause a Type IV allergic reaction in genetically predisposed individuals. This allergy is mediated by T-lymphocytes (white blood cells) that have had prior contact to a given allergen (memory lymphocytes). When they are exposed to the sensitizing allergen, these memory lymphocytes respond by enlarging (lymphoblast transformation) and dividing (proliferation). The newly formed cells (effector cells) together with their secreted cytokines mediate the resulting allergic reaction (see test principle).
What symptoms may be indicative of a metal allergy? The classical symptom is contact eczema. In addition, chronic exposure to metals may cause a wide range of symptoms and has been implicated in the etiology of allergy, chronic fatigue syndrome (CFS), multiple sclerosis (MS), fibromyalgia, and possibly multiple chemical sensitivity (MCS).
Which metals can induce an allergy? The most frequent metal allergens are nickel, gold, palladium, different types of mercury compounds, cobalt and chromium. Occasionally, other metals can induce positive responses in MELISA�, such as beryllium, titanium, tin, platinum and copper.
In which every day items or medical products can sensitizing metals be found? Jewelry, dental restorations and implants, cosmetics, metal joint prostheses, vascular stents, coins, etc.
Do certain occupations pose a special risk for inducing a metal allergy? Construction workers (masons, concrete workers): chromium, cobalt; miners: chromium, cobalt; electricians, photographers: chromium; aircraft constructors: beryllium; hair dressers, beauticians: nickel, titanium; galvanizers: nickel, chromium, cobalt, mercury; rubber industry: chromium, cobalt; maids: nickel; wood and paper industry: chromium; shoemakers: chromium; painters: chromium, cobalt; metal workers: chromium, nickel, cobalt; textile industry, dentists, dental technicians: nickel, mercury.
In which fields of medicine does a metal allergy play an important role? General medicine, dentistry, allergology, occupational medicine, orthopedics, surgery, dermatology, internal medicine, pediatrics, homeopathic medicine, and environmental medicine.
How can a metal allergy be diagnosed? With a skin test or, more reliably, with the MELISA� test (memory lymphocyte immuno stimulation assay).
Is the MELISA� test medically validated, i.e., were MELISA� test results correlated with other parameters of a metal allergy (skin tests, etc.)? Yes, during development of the test by Prof. Stejskal as well as in follow-up studies (see Literature).
How does the MELISA� test work? White blood cells (lymphocytes) from whole blood are isolated and tested against allergens chosen accordingly to the patients anamnesis, dental and occupational history. The blood is incubated for five days and the lymphocyte reaction is measured by two separate technologies: one based on the uptake of radioisotope by dividing lymphocytes; the other by evaluation by microscopy. The level of reactivity is measured as a Stimulation Index (SI). A value over 3 indicates a positive reaction to a given allergen.
What material is required for the MELISA� test? MELISA� laboratories need 20-40 ml of blood depending on the number of metals tested. The blood has to be drawn into special tubes containing sodium citrate (anti-coagulant). The patient should not be taking any immuno suppressive medication as this may affect the test results. Examples of such medication are steroids, allergy medicine, anti-inflammatory medicine, painkillers etc.
Can the blood samples be sent to a laboratory? Yes, with a courier such as FedEx or DHL. The blood must be stored at room temperature and arrive in the laboratory within 24 hours (maximally 48 hours) of drawing. Write on package: "warm transport, do not chill". Designate samples "clinical specimens, non-infectious, non-hazardous"
How long does the MELISA� test take? Approx. 1 week.
Copyright � 2005 Melisa � Medical Foundation
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thanks my friend
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