laser welding in orthodontics - examples · laser welding in orthodontics – examples ... to...

Laser welding in orthodonticsExamples

EN

1/1

Laser welding in orthodontics – Examples

The welding of small parts in orthodontics demands the same preparation and conditions as general laser welding.

An accurate fit and gap-free preparation of the parts to be joined is essential for the successful welding of very thick parts (e. g. wires) to very thin ones (e.g. bands).

To produce a good laser weld in the orthodontic field, the parts must be prepared so that they lie flat against one another. In particular, standard industrially produced parts such as the pivot on the Herbst or the base of a buccal tube must be prepared with special burs to ensure that they lie flat against bands of different sizes and shapes.Only in this way is it possible to join these parts directly to one another without using filler material.

If the contact between the band and the wire is only a spot, or if there is a slight gap between them, a suitable filler material such as remanium® wire ø 0.35 mm is also necessary.

Generally speaking, laser welding should always be done under a protective argon atmosphere in order to prevent any oxidation of the weld. This is essential to give it the strength it requires. The welding spots must have a metallic lustre.

The various components used in orthodontics often have a shiny metallic surface, which in turn causes the laser beam to be reflected. Because of the elaborate finishing involved, these parts are not usually subjected to shot blasting.

However, in order to achieve the desired welding result, it may be necessary to vary the angle at which the laser beam strikes the joining area. This means that the welding power has to be adapted to the circumstances in question. Normal-ly, the power is increased individually, and the angle selected in such a way that it proceeds from the thicker to the thinner part.

In the following, various tasks are described step by step. The welding para-meters vary from situation to situation.

1/2

Laser welding in orthodontics – Example (Refer to welding table No. 2 for Dentaurum laser welding units, orthodontics)

Herbst IV (REF 607-115-00) welding pivots to maxillary molar bands / mandibular cuspid or bicuspid bands.

The underside of the pivot on the Herbst IV is ground to ensure that it lies flat on the band:Welding power: voltage: approx. 230 V pulse duration: 3.0 ms diameter: 0.8 mm

Fig. 1

Fig. 2

1/3


A gap between band and pivot may open up in the area of the buccal fissure. In this area, it is necessary to work with remanium® wire ø 0.35 mm (REF 535-035-00) as filler material.

If the pivot is welded to the band on the plaster model, the bands should be blocked out with wax from inside (thickness approx. 1 – 2 mm) at the welding points before making the model.Before the actual welding operation, the wax is removed with a steam jet to prevent direct contact between the bands and the plaster.

Fig. 3

2/1


Welding Hyrax®/Palex® screw (e.g. REF 602-807-00) with reinfor-cing wire remanium® ø 1.0 mm to upper maxillary molar band and bicuspid band.

The reinforcing wire remanium® ø 1.0 mm is bent onto the molar band. It is advisable to grind the wire slightly flat with a grinding tool (see diagram).

Fig. 2

Molar band remanium® wire ø 1,0 mm

Welding power:voltage: 230 – 240 V pulse duration: 3.0 – 3.5 ms diameter: 0.8 – 0.9 mm

Fig. 1

2/2


Larger gaps can be filled with remanium® wire ø 0.35 mm (REF 535-035-00) as filler material. First, the 0.35 mm wire is welded to the band and then to the 1.0 mm wire.

Welding power: voltage: 240 – 250 V pulse duration: 3.5 – 4.0 ms diameter: 0.8 mm

The retention leg of the Hyrax®/Palex® screw is butt welded to the reinforcing wire.

Welding power: voltage: 260 V pulse duration: 6 .0 ms diameter: 0.8 mm

Fig. 3

Fig. 4

2/3


The weld is then strengthened with remanium® wire ø 0.35 mm (REF 535-035-00).


If welding is done on the plaster model, the bands should be blocked out with wax from inside (thickness approx. 1 – 2 mm) at the welding points before making the model.Before the actual welding operation, the wax is removed with a steam jet to prevent direct contact between the bands and the plaster.

Fig. 5

Fig. 6

2/4


Fig. 7

Complete laser welded hyrax®/palex® appliance.

3/1


Fig. 1

Fig. 2

Welding a buccal tube to a molar band

Welding power: voltage: 230 V pulse duration: 3.0 ms diameter: 0.8 mm

remanium® wire ø 0.35 mm (REF 535-035-00) is used as filler material to bridge a larger gap on the buccal fissure.

4/1


Fig. 1

Welding a double hook to a molar band

Welding power: voltage: 230 V pulse duration: 3.0 ms diameter: 0.8 mm

remanium® wire ø 0.35 mm (REF 535-035-00) is used as filler material to bridge a larger gap on the buccal fissure.

5/1


Repairing a broken labial bow


Fig. 1

Fig. 2

5/2


Fig. 3

Fig. 4

Following this, a short piece of spring-hard remanium® wire ø 0.7 mm is welded on as double reinforcement parallel to the activation direction.

This way, the spring effect of the labial bow is assured, allowing it to be activated.


5/3


Fig. 5

Fig. 6

The remanium® wire welded on as reinforcement is then slightly rounded off with the rubber polisher.

6/1


Producing a Crozat appliance, remaloy® wires ø 0.7 mm – 1.5 mm, remanium® wires ø 0.7 mm – 1.5 mmTo make curved Crozat appliances, it is possible to use either remaloy® wires or remanium® wires. In their un-annealed state, remaloy® wires can be bent easily into shape. If greater strengths are required, remanium® wires with graded strengths can be used. Because of the small area affected by heat after laser wel-ding, remanium® wires achieve up to 80% of their original strength value.

When bending and waxing the individual wire elements into place, it must be ensured that they have good surface contact at the welding points and that no gaps exist.

Fig. 1

Optimum preparation of a Jackson clasp

Fig. 2

6/2


When prepared correctly, the wires can be welded directly to one another.


Fig. 4

Wrong!! The gap between the individual wire elements is too big.

Fig. 3

Wrong!!

6/3


If a gap still remains, remanium® wire ø 0.35 mm (REF 535-035-00) can be used as filler material.

Welding power: voltage: 240 – 250 V pulse duration: 3.0 ms diameter: 0.8 mm

This is “dripped” from the tip into the gap to form a welding bead.

Fig. 5

Welded Jackson clasp on the plaster model.

Fig. 6

6/4

Laser welding in orthodontics – Example (No. 8, welding table for Dentaurum laser welding units, orthodontics)

The welding point can still be smoothed with a “soft” power setting.

Welding power: voltage: approx. 250 V pulse duration: 5.0 ms diameter: 0.8 mm

Fig. 7

Completed laser welded Crozat appliance.

Fig. 8

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Mod

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989-

629-

20

Prin

ted

by D

enta

urum

G

erm

any

08

/15/

B/R1

-2

For more information on our products and services, please visit www.dentaurum.com

Date of information: 08/15

Subject to modifications

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laser welding in orthodontics - examples · laser welding in orthodontics – examples ... to...

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