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Cera Dynamics Ltd

Technical Solutions in Glass & Ceramics


Glasses for Dental & Medical


Cera Dynamics Ltd Cera Dynamics Ltd (CDL) is the Technical Glass division of the James Kent Group of companies, specialising in highly-specified glass compositions and customised particle size distributions. We produce high purity glasses on kilns that are constructed to our own unique and environmentally conscious design. Traditional “Open Fired” methods of melting glass can lead to the loss of volatile but vital chemical components from within the glass. Our kilns operate using the “Cold Crust” method of melting; this helps to lock in those volatiles that are part of the glasses composition. Along with both wet and dry grinding systems, and spray-drying, CDL can offer technical powders with bespoke particle size distributions.


Inert Glasses Cera Dynamics produces Barium Oxide based glasses for typical composite applications as well as developing new formulations for future novel composites. With our melting and grinding facilities we are able to offer custom compositions or particle-size distributions based on the glasses below. DF 11

DF 12

SiO2-Al2O3-B2O3

72%

61%

Radiopacifier

25% BaO

34% BaO/ZnO

F

2%

2.5%

Radio-opacity

3.1

3.8

Refractive index

1.525

1.530

Our grinding process produces a clean and highly-transparent powder, suitable for the most demanding of applications.


Reactive Glasses Cera Dynamics is capable of producing a wide range of reactive glasses. Our kilns are specially designed to produce fluoride-containing glasses with almost no loss of volatile components. We can supply bespoke formulations to a customers individual requirements. We offer the following tried and tested compositions as a starting point. RG 3

RG 4

RG 5

Radiopaque

Radiopaque

Radiolucent

SiO2

24%

24%

32%

Al2O3

30%

30%

33%

P2O5

7%

8%

8%

RO

29% (Ca,Ba)

28% (Ca,Sr)

14% (Ca)

Na2O

2%

2%

4%

F

14%

14%

15%

Our reactive glasses are available as glass frit (water-quenched glass) or ground to a specific particle size distribution. The powders are spray-dried for optimum handle-ability without compromising their dispersion in liquids.


Grinding & Spray Drying We use our own grinding process for the production of high-purity powders for dental and medical applications. The high-purity and specific refractive index of our inert glasses make them suitable for use in highly-transparent dental composites. With reactive glasses we can fine tune the reactivity of the glasses through control of the average particle size and the width of the distribution. The graph gives an indication of the extremities of our grinding capabilities. We can control both the particle size distribution and fineness of our glass powders.

10 10

CDL CDL Ground Ground Glasses Glasses Typical Typical Particle Particle Size Size Distribution Distribution

Our spray-drying process produces a powder composed of clusters of particles, loosely held together. This reduces the tendency of powders to separate and to produce dust, whilst not impairing the mixing with liquids. CDL Ground Glasses Ground Glasses TypicalCDL Particle Size Distribution

9 9

Typical Particle Size Distribution

8 8

Reactive Glass (Narrow) Inert Filler (d50 < 0.7µm)

8 Reactive Glass Glass (Broad) Reactive Reactive Glass (Broad) (Broad) 7 Glass (Narrow) Reactive Reactive Reactive Glass Glass (Narrow) (Narrow) Inert Filler (d50 < Inert Filler Filler (d50 < < 0.7µm) 0.7µm) 6 (d50 Inert 0.7µm) Volume / %

6 6

9

5 5

Volume / %

Volume Volume Volume/ //% % %

7 7

4 4 3 3

Reactive Glass (Broad) Reactive Glass (Narrow) Inert Filler (d50 < 0.7µm)

5 4 3 2

2 2

1

1 1 0 0

10

Reactive Glass (Broad)

0 0.01

0.1

1 Particle / µm Particle SizeSize / µm

0.01 0.01

0.1 0.1

1 1 Particle Size / µm Particle Size / µm

10 10

10


Cera Dynamics Ltd Fountain Street, Fenton Stoke-on-Trent, Staffordshire United Kingdom, ST4 2HB Tel: Fax: E-mail: Website:

+44 (0)1782 744335 +44 (0)1782 574600 sales@ceradynamics.com www.ceradynamics.com

An ISO accredited company

Cera Dynamics Ltd. is part of the James Kent Group


Cera Dynamics IDS 2013