bredent casting technique
TRANSCRIPT
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 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 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.