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Specialty Glasses For Composites, Reactive Ionomers and Porcelains for Crown and Bridge

What Are Composite Restorative Dental Materials?

Nano Tooth

Composite restorative dental materials are special materials fabricated and designed to be used exclusively in dentistry. A composite restorative is a mixture of resin and inorganic fillers such as glass that is either self-cured or light cured. SGI dental glasses are inorganic fillers for use in specially formulated composites and compomers. These glasses are high purity and can be ground into ultra-fine particle sizes for optimum resin loading which is known to reduce shrinkage. The characteristics and uses of a composite vary from temporary fillings, dental restorations, endodontic uses, dental implants and more.

We offer a wide variety of formulations for composite glasses. Each of these formulations features a different Index of Refraction, which allows for matching to some of the most commonly used dental resins, for excellent transparency and esthetics. Some of our standard formulations and partial sizes are listed in the table below:

Composite Glass Fillers
Radio-opacity Component
~ %
Index of Refraction
CTE X 10-7/°C
Barium
30
1.541
55
Barium
35
1.555
55
Barium
25
1.530
52
Barium
45
1.573
72
Barium
20
1.510
45
Strontium
15
1.503
38
Zinc
20
1.530
25
Borosilicate
(Non Radio-opaque)
0
1.475
39
Particle Size*
D50
(typical um)
D90
< um
15.0 um
±2.0
15.1
<45.0
10.0 um
±2.0
9.2
<25.0
5.0 um
±1.0
5.0
<15.0
3.0 um
+1.5 -.5
3.75
<9.0
2.0 um
± .3
2.13
<5.0
1.0 um
± .2
1.1
<3.0
.7 um
±1
.72
<1.5
*Not all glasses available in all particle sizes

With the addition of ultra-fine particles to composite restorative dental material formulations, customers are able to achieve improvement in flexural strength, high load factor, transparency, aesthetics, polish ability, wear resistance, abrasion of opposing teeth and handling.

What Are Reactive Ionomer Dental Materials?

Reactive ionomer glasses have complex structures and consist of many elements. Three principal components are Silica, Alumina and either Calcium, Strontium or Zinc – with the most important being the Al:Si ratio in the glass. The role of network modifiers determines the structural role of the alumina within the glass network. Fluoride releasing glasses are an effective agent in caries prevention. Customers use reactive ionomer dental glasses, together with an ionomer liquid, to produce a glass ionomer cement of the highest quality. These glasses can also be used in compomers providing fluoride release.
Reactive Ionomer Glasses
Fluoroaluminosilicates
~ %
Index of Refraction
CTE X 10-7/°C
% Fluoride
Calcium/Barium
25
1.507
85
10 – 17
Strontium
20
1.501
90
na

The melting and processing of ionomer glasses is tightly controlled for F content. SGI also stringently controls the milling operation for a consistent particle size distribution which is critical for the strength and mechanical properties of your end product. Particle size distribution (PSD) is available on the Calcium/Barium formulations in 2um, 5um and 10 um with customization available on most products.

What are Porcelain Restoratives?

Dental glasses are manufactured for use in varying types of dental porcelain powders for metal and all ceramic restorations. These are glasses that are high fusing, medium fusing and low fusing for bonding to the coping of choice. Blends of these glasses allow for use in many aspects of the building of the crown. The glasses are custom tailored for thermal expansion, fusing and fluorescing properties.

Wide Range of Customized Services

At Specialty Glass, we are well aware that not all materials are created equal, hence our decision to create specialty glasses. We offer a wide variety of formulations for dental glasses each with specific properties tailored to the different applications. In fact, many of our customers have the opportunity to work with us to create a unique, custom-designed formulation melted and ground to custom particle size distribution.

Quality Commitment

The quality of the products we manufacture is what allows us to gain and maintain our reputation of producing high quality dental glasses. Our positioning as such is made possible thanks to our state-of-the-art technology. Our thorough quality assurance process includes:

  • Ensuring our manufactured dental glass adheres to strict specifications
  • Testing of the product at various points of the production process, in our in-house lab.
  • Using high quality raw materials
  • Keeping detailed documentation on each batch produced for total process traceability

With the meticulous work of our entire team, we are able to provide each of our customers with individualized attention from the first steps of their project.

Specialty Glasses For Composites, Reactive Ionomers and Porcelains for Crown and Bridge November 18, 2014