Dental soldering

D R A . Y A Z L E Y A B I G A I L R A M O S A V A L O S

D R . A L F R E D O N E V Á R E Z R A S C Ó N

DENTAL SOLDERING

INSTITUTO DE CIENCIAS

BIOMÉDICAS

UNIVERSIDAD AUTÓNOMA DE CIUDAD

JUÁREZ

Terms

soldering: is used in dentistry for most of the metal union processes involving the flow of filler metal between two or more metal components. Technically the correct term is brazing.

http://www.oriondentalwelders.com/index.php

Fig. 1

Terms

• Welding Flux: material used to prevent the growth of oxides and other undesirable substances which can reduce the quality or strength of the welded metal structure, or to dissolve and facilitate their removal.

• Liquefaction: equilibrium phase, the temperatures at which the a metals alloy system begins to solidify by cooling or become completely liquid when cooled.

Imagen http://www.kuss-dental.com/es/imgs/product/joker.jpg

Terms

Brazing: process for join solid metal parts by heating at a appropriate temperature, allowing the filler metal reaches its liquid us temperature above 450 ° C to melt and flows by capillary attraction between the parts without affecting the dimensions of the structure attached.

http://www.hilderbrand.ch/products.html

Fig. 2

Terms

Fusion welding: union of two or more pieces of metal applying heat, pressure, or both with filler metal or without it. The thickness of metal if it is usedshould be higher than capillary dimensions found in brazing.


Terms

Welding Union: processes that bind metals by heating them at an adequate temperature and when applying a filler metal that liquefy without exceeding 450 ° C that blends and flows by capillary attraction between the parts without affecting the dimensions of the bonded structure.

solidification: temperatures where the metals of alloy system is solidified by cooling or start to melt by heating them.

Terms

Emptied Union: process of joining two components of a fixed partial denture through casting a molten metal in a region covered with interconnected between the components.


types of welding

autogenic → join two surfaces through heat without needing to add welding. Occurs a fusion of both sides and then by pressure meet.

common → is used in dentistry. An example are those that are based on gold, because it does not have corrosion or pigmentation.


CAST JOINING

Another type of metal joining procedure in dentistry. It is the process of combining two components of a fixed partial denture bye means of casting molten metal into interlocking region between invested components. Fig. 3

Toptrowns.en.alibaba.com

DIFFERENCES

Soldering/brazing: the difference is between the liquidus temperature of the filler metal.

Soldering & brazing/welding: possible absence of the filler metal & the partial fusion of the parts joined by welding.


Composition of Welding

Gold solders → Copper, Silver, Tin and Zinc.

High Fusion Welds → Nickel, Chromium and Beryllium.

Low Fusion Welds→ Silver, Tin and Zinc.

http://www.bego.com

Fig. 4

Desirable properties for a welding

Easy flow of parts to be welded.

Good adhesion physics.

Melt temperature 100 ° lower than the parts to be joined.

It should not form pores or cavities.

Resistance equal to or greater than the parts being joined.

Color to match what is being welded.

Resistant to corrosion, and pigmentation, ie which is proportional to the fineness(amount of gold)


Requirements of the joint surfaces

Clean and free of grease and residues of research ratings.

Surface of color matte (not glossy).

Cover with fluxes.


Fluxes

Characteristics:

ceramic material.

Capacity of flow over areas to be welded.

Melts at a lower temperature than the alloy to be welded.

Remove oxides from the surface to be welded.


Fluxes

Divided in three types:

Surface Protection : covers the surface of metal and prevents the enter of oxygen for not letting the form of oxide.

Reducing Agent: This type of flux reduce any oxide present and shows a clean metal.

Solvent: this type of flux dissolves any oxide present and stir.


Lazer Weldings

Type autogenous welding. That present a optical focused that enables you to see more accurately. Is used in:

Welding implants.

Join porcelain bridges.

Repairs metal insert..

Fig. 5

http://www.dentalzainduz.com

Fig. 7

http://www.dentistaschile.cl

Fig.6

Gordon Smith, University of Manchester.

Lazer Welding

Trademarks:

DL-2000 dental laser

AX-AWM1 Argon-arc Spot Welders

http://www.dentalcompare.com http://www.dentalcompare.com

Fig. 8

Fig. 9

Bibliografía

http://www.radiodent.cl/materiales_dentales/soldaduras.pdf

Phillips. La ciencia de los Materiales dentales pgs. 649-660 Unindad 27,

Fig. 10

http://1.bp.blogspot.com

Dental soldering

Education

Transcript of Dental soldering