Bredent Casting Technique

»Systematic procedure

»Model fabrication

»Preparation for casting

»Overview – casting techniques

»Biocompatibility

Bredent Casting Technique

The bredent group is an internationally-active, family-run company. It develops and produces optimally coordinated stand-alone products, system solutions (e.g. in implant prosthetics) and "Made in Germany" treatment concepts. These enable dentists and dental technicians to produce and maintain high-quality, precision, cost-effective aesthetic restorations that ensure periodontal hygiene.The bredent casting technique includes all work processes required for the production of casting moulds and the chemical-physical processes during melting, casting and the re-solidification of materials. Materials that are perfectly matched with this technique and the processes are found in the certified symbiotic system (css).

Systematic procedurePlanning and effects

A single biocompatible

material does not guarantee

biocompatible dental

restorations. High-quality,

biocompatible dental

restorations require thorough planning.

The bredent casting technique takes all essential components of the combination "Patient – Materials – Production" into consideration.

Systematic procedurebredent quality

• The bredent casting technique

is based on the commitment

to quality and the requirements

of a responsible patient for

biocompatible dental

restorations under the aspect of long-term biocompatibility.

Systematic procedureadvantages

■ Sprues can be universally Used for

all alloys■ Volume compensation results

in easy-to-polish casting without

shrinkage cavities■ Special muffle shapes allow ideal positioning of wax objects■ Deformation-free spruing and investing reduce the fitting time■ Few Sprues for reduced material usage

■ Structured book "bredent casting technique" for dependable use.

Systematic procedureDevelopment

The bredent casting technique is

a complete system.It combines know-how and

materials.

The dental technician is enabled

to achieve reproducible, homogenous and patient-compatible results.

Systematic procedureLaboratory situation

The bredent casting

technique is matched with

the respective laboratory

situation to meet the

requirements for high-

quality dental restorations.

Systematic procedureBasic requirements

• To be able to successfully

apply the bredent casting

technique, competence

in the systematic

procedure

(according to Andreas Sabath).

Model fabricationThixo-Rock class IVsuper-hard stone

The low expansion is just

0.06 % after two hours

and the limit is 0.08 %.

This stone allows

reproduction of all details

of the original situation

and the fabrication of highly accurate dentures.

Thixo-Rock is available in brown, ivory and grey.

Model fabricationControl of expansion

Control of the expansion of a plaster model.

Model fabricationDuplicating system

The duplicating technique

is the major element and

the basis for highly accurate

duplicates. The stable plastic

components of the bredent

duplicating system ensure unsurpassed precision when preparing duplicates and reduce errors.

Model fabricationBresol N for the one-

piece casting technique

Perfect control of the expansion

of brevest M1 in different areas

of an investment model,

recommended to use Bresol N

investment material liquid – required for accurate secondary structures in the one-piece casting technique.

Model fabricationOptimal mixing

• Homogeneous mixing with

the ecovac mixing system.

The three-dimensional

ecovac mixing spiral in

conjunction with the

smooth surface and the conical shape of the bottom of the ecovac mixing cup allows to take up all the material inside and to mix it in horizontal and vertical direction.

Preparation for castingLinear preheating

Preparation for castingBar casting

When preparing sprues,

it must be ensured that

the sprues are directed

to the melting reservoir

via the center or heat.

A horizontal bar which is

placed in the center of the casting ring serves as a melting reservoir.

Preparation for castingAttaching the rinsing head

Correct dimensioning of the

sprue/s to be attached and

sufficient thickness of the

sprue/s and the rinsing heads

are essential for homogeneous

dental casting and ensure rapid flowing in.

Preparation for castingCasting with sprues

If a gold or precious metal

bonding alloy is used for

casting the framework, the

design shown in the pictures

is sufficient.

Crystallization cooling fins

or a second sprue are not required.

Preparation for castingCrown

When using NPM alloys

for all cast crowns or

bridges, sectional investing

is recommended to

improve the surface of the

casting.

The same applies to providing crystallization cooling fins – their use eliminates errors of investing or porosities in the casting.

Preparation for castingBar restorations

A correctly wax-up bar

structure needs to have

suitable sprues to ensure

perfect casting. It is essential

to obtain rapid and uniform

filling of the mould with the

alloy.

Preparation for castingCoCr restorations

The sprues must be attached in a way to ensure that they are directed to the casting funnel via the center in the investment muffle.

Overview – casting techniqueFlame centrifugal casting

The alloy is melted with the flame and fed into the cavity with the centrifuge arm.

■ Unsuitable: Blow torch, welding torch■ Suitable: Melting torch

Overview – casting techniquesCentrifugal casting with crucibles

The alloy is melted with the resistance heating and transported/fed into the cavity of the casting with the centrifuge arm.

Overview – casting techniquesInduction centrifugal casting

The alloy is melted with the resistance heating and transported/fed into the cavity of the casting with the centrifuge arm.

Overview – casting techniquesResistance-heated vacuum pressure casting

The alloy is melted with the resistance heating and flows into the cavity (oxygen-reduced atmosphere); residual filling is achieved by pressurization.

Overview – casting techniquesInduction vacuum pressure casting

The alloy is melted with the induction heating and flows into the cavity (oxygen-reduced atmosphere); residual filling and homogenization during the solidification process are achieved by pressurization.

BiocompatibilityCareful planning

High-quality restorations are based on careful planning and fabrication. If the patient does not have any complaints over an extended period, our restorative work has been highly successful.

BiocompatibilityAnalysis of the oral situation

The first step in the fabrication

of biocompatible restorations

is the analysis of all materials

involved in the fabrication.

Interaction with existing

materials, defects/deficiencies

due to incomplete repair,

medication especially for chronically sick persons or environmental pollutants affect the compatibility considerably. Initial errors may already be made during material tests if material samples/specimens are prepared in an incorrect manner.

BiocompatibilityPerfect fit

Biocompatible restorations

require perfect fit,

homogeneous casting

structure, suitable

connection technique and

surface treatment and

perfect bonding of the

veneer. Safe and dependable process parameters are essential because control at a later time would involve the destruction of the material.

BiocompatibilityPreconditions for well-being

A patient will only accept the integrated restoration if it contributes to his well-being. Quality, esthetics and bite situation are the basic pillars and are maintained by proper oral hygiene and nutrition and protect the patient's health.

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