One question for roland users milling vita enamic

[Jarmw89]

Can you use carbide burs for milling vita enamic, or do you have to use the HY burs?
Do you use vita enamic for individual crowns?

 

[Pieter]

Best to use diamond and mill it wet - Enamic consists of 84% ceramic by weight. And yes it can be used for single crowns. Etching is really important- do it according to the instructions. Rather under etch than over etch. Really nice for minimal invasive procedures. It can be milled as thin as 0.2 mm. No other material can do that without chipping.

 

[Jarmw89]

Thanks for your answer, I have a Roland dwx50, so I can't mill it with my machine and diamond burs?

 

[Glenn Kennedy]

The HY tools were designed specifically for composite milling so they will give you the best results. They ran a lot of tests and tried a lot of different designs to create the HY tools but you could certainly try carbide and compare the results.

 

[Pieter]

The HY tools were designed specifically for composite milling so they will give you the best results. They ran a lot of tests and tried a lot of different designs to create the HY tools but you could certainly try carbide and compare the results.

Enamic is not composite- Its is 86 % Ceramic and 14% polymer. Not sure dry milling wont have an effect on the integrity of the material.
It is a porous ceramic block infiltrated with polymer in the pores. What does dry milling do to the ceramic structure? Ceramic should be grinded not cut.
From the Roland web-site:
"Certification has been given for milling VITA ENAMIC® with the DWX-51D equipped with ZDB-100D/50D/30D milling burs developed specifically for milling dental hybrid type materials."
Strategy and burs seems to be matched with the material. No mention is made of the DWX 50.

 

[Glenn Kennedy]

com·pos·ite
kəmˈpäzət/compound, complex;More
combined, blended, mixed
"a composite structure"

• (especially of a constructional material) made up of recognizable constituents.
  "a new composite material—a blend of plastic and ceramic resins"
• (of a railroad car) having compartments of more than one class or function.
• Mathematics
  (of an integer) being the product of two or more factors greater than one; not prime.

• 2.
  relating to or denoting a classical order of architecture consisting of elements of the Ionic and Corinthian orders.

• 3.
  Botany
  relating to or denoting plants of the daisy family ( Compositae ).

noun
noun: composite; plural noun: composites; noun: Composite

1. 1.
   a thing made up of several parts or elements.
   "the English legal system is a composite of legislation and judicial precedent"
   synonyms: amalgamation, amalgam, combination, compound, fusion, synthesis, mixture, blend;
   alloy
   "a composite of plastic and metal"
   • a composite constructional material.
2. 2.
   Botany
   a plant of the daisy family ( Compositae ).
3. 3.
   the Composite order of architecture.

verb
verb: composite; 3rd person present: composites; past tense: composited; past participle: composited; gerund or present participle: compositing

1. 1.
   combine (two or more images) to make a single picture, especially electronically.
   "photographic compositing by computer"

 

[Pieter]

com·pos·ite
kəmˈpäzət/compound, complex;More
combined, blended, mixed
"a composite structure"

• (especially of a constructional material) made up of recognizable constituents.
  "a new composite material—a blend of plastic and ceramic resins"
• (of a railroad car) having compartments of more than one class or function.
• Mathematics
  (of an integer) being the product of two or more factors greater than one; not prime.

• 2.
  relating to or denoting a classical order of architecture consisting of elements of the Ionic and Corinthian orders.

• 3.
  Botany
  relating to or denoting plants of the daisy family ( Compositae ).

noun
noun: composite; plural noun: composites; noun: Composite

1. 1.
   a thing made up of several parts or elements.
   "the English legal system is a composite of legislation and judicial precedent"
   synonyms: amalgamation, amalgam, combination, compound, fusion, synthesis, mixture, blend;
   alloy
   "a composite of plastic and metal"
   • a composite constructional material.
2. 2.
   Botany
   a plant of the daisy family ( Compositae ).
3. 3.
   the Composite order of architecture.

verb
verb: composite; 3rd person present: composites; past tense: composited; past participle: composited; gerund or present participle: compositing

1. 1.
   combine (two or more images) to make a single picture, especially electronically.
   "photographic compositing by computer"

Dental composite resins are types of synthetic resins which are used in dentistry as restorative material or adhesives. Synthetic resins evolved as restorative materials since they were insoluble, aesthetic, insensitive to dehydration, easy to manipulate and reasonably inexpensive. Composite resins are most commonly composed of Bis-GMA and other dimethacrylate monomers (TEGMA, UDMA, HDDMA),a filler material such as silica and in most current applications, a photo initiator. Dimethylglyoxime is also commonly added to achieve certain physical properties such as flow ability. Further tailoring of physical properties is achieved by formulating unique concentrations of each constituent.

I thought we are talking Dentistry here?

 

[Pieter]

Dental composite resins are types of synthetic resins which are used in dentistry as restorative material or adhesives. Synthetic resins evolved as restorative materials since they were insoluble, aesthetic, insensitive to dehydration, easy to manipulate and reasonably inexpensive. Composite resins are most commonly composed of Bis-GMA and other dimethacrylate monomers (TEGMA, UDMA, HDDMA),a filler material such as silica and in most current applications, a photo initiator. Dimethylglyoxime is also commonly added to achieve certain physical properties such as flow ability. Further tailoring of physical properties is achieved by formulating unique concentrations of each constituent.

I thought we are talking Dentistry here?

Was lava Ultimate a Dental composite - yes
Is Enamic a Dental composite - no
Is Dental ceramic a composite of feltspar, alumina etc? - yes - It is still not called a Dental Composite.

 

[Pieter]

Was lava Ultimate a Dental composite - yes
Is Enamic a Dental composite - no
Is Dental ceramic a composite of feltspar, alumina etc? - yes - It is still not called a Dental Composite.

If you have more doubt look at the ISO specs on Composites, Ceramic and Hybrid ceramics.

 

[zero_zero]

How's the Enamic holding up in the long term ?

 

[Pieter]

How's the Enamic holding up in the long term ?

Still too new to judge but so far I have not heard of problems besides some individuals over-etching it with 9% Hydrofluoric instead of using 5% Over-etching removes too much ceramic and the excess of remaining polymer does not facilitate a good bond. Therefore stick to the instructions.
I also think it is important to stick to the indications and not to try procedures outside the scope of the material.

 

[zero_zero]

What about wear ? Does it attract plaque ?

 

[Pieter]

What about wear ? Does it attract plaque ?

The wear is very close to natural tooth structure. Antagonist wear also. The plaque index is far superior to true composites and similar to ceramic. Well within the ISO specs. Same for discoloration.

 

[zero_zero]

Thanks, will give it try...it might gain some market one day up here in the boonies too...

 

[prestige.dental]

Was lava Ultimate a Dental composite - yes
Is Enamic a Dental composite - no
Is Dental ceramic a composite of feltspar, alumina etc? - yes - It is still not called a Dental Composite.

Very knowledgeful thanks

Can we call zirconia crown ceramic crown
Is zirconia a ceramic.
What is the difference in glass and ceramic . Can u pl clarify Pieter.

 

[Pieter]

I am not heavily into the semantics. But ask a Dentist/Technician what a "composite" is and they know the Dental term. Glenn is right in terms of language.
Zirconium is a metal
Zirconium Dioxide (ZrO2) used in Dentistry is a ceramic


"Yttrium tetragonal Zirconia polycrystals (Y-TZP) based systems are the more recent addition in to the high-strength all-ceramic systems that are used for crowns and fixed partial dentures."

 

[Pieter]

Glass is mostly made up of silica -
Here are the basic components of modern glass:

• Pure Silica(SiO2 , fused quartz) represents 70-74% weight of modern glass. In ancient times, glassworkers prepared recipes with more than 90% of pure silica, but because this substance has a melting point of about 2000 degrees centigrade (3,600° F) chemist found a way to lower that temperature by introducing various additives into the mix, most notably sodium carbonate. One of the most interesting features of pure silica glass is its ability to block UV radiation, which modern 70-72% silica glass can't do.

• Sodium carbonate(Na2CO3) represent important ingredient of modern glass that adds both positive and negative features. It successfully lowers the melting point of silica to more manageable 1200 °C but it also makes the glass water soluble.

• To prevent glass from being water soluble and to increase its chemical structure, lime(calcium oxide, CaO),magnesium oxide(MgO) and aluminum oxide(Al2O3) are added. Glass enriched with lime represents over 90% of the glass that is use today.

• Addition of lead oxide, barium and lanthanum oxide can increase glass refractive index, making it more reflecting and suitable for optical purposes (eyeglasses and lenses).Thorium oxide served a similar role in the past, but it was phased out from manufacture because of its radioactivity.

• Sodium sulfate, sodium chloride, or antimony oxide can be added to prevent the creation of air bubbles in the glass mixture.

Dental ceramics broadly contain feldspar, silica and alumina with a few other substances (e.g. leucite) included depending on the brand. Dental Ceramics therefore contains glass.

Dental Porcelain is basically available in two versions
Feldspatic Porcelains and Aluminous Porcelains

 

[prestige.dental]

Glass is mostly made up of silica -
Here are the basic components of modern glass:

• Pure Silica(SiO2 , fused quartz) represents 70-74% weight of modern glass. In ancient times, glassworkers prepared recipes with more than 90% of pure silica, but because this substance has a melting point of about 2000 degrees centigrade (3,600° F) chemist found a way to lower that temperature by introducing various additives into the mix, most notably sodium carbonate. One of the most interesting features of pure silica glass is its ability to block UV radiation, which modern 70-72% silica glass can't do.

• Sodium carbonate(Na2CO3) represent important ingredient of modern glass that adds both positive and negative features. It successfully lowers the melting point of silica to more manageable 1200 °C but it also makes the glass water soluble.

• To prevent glass from being water soluble and to increase its chemical structure, lime(calcium oxide, CaO),magnesium oxide(MgO) and aluminum oxide(Al2O3) are added. Glass enriched with lime represents over 90% of the glass that is use today.

• Addition of lead oxide, barium and lanthanum oxide can increase glass refractive index, making it more reflecting and suitable for optical purposes (eyeglasses and lenses).Thorium oxide served a similar role in the past, but it was phased out from manufacture because of its radioactivity.

• Sodium sulfate, sodium chloride, or antimony oxide can be added to prevent the creation of air bubbles in the glass mixture.

Dental ceramics broadly contain feldspar, silica and alumina with a few other substances (e.g. leucite) included depending on the brand. Dental Ceramics therefore contains glass.

Dental Porcelain is basically available in two versions
Feldspatic Porcelains and Aluminous Porcelains

Thanks