parallelometer

an instrument that shows the

parallelism between the stumps abutment teeth

in the applicationof fixed prostheses.

THE OBJECT• To have a tool easy to

handle.• To be sure of preparing

perfectly parallel stumps.• To spare the patient further

sessions necessary to “retouch” the abutment teeth.

• To have fixed prostheses which fit perfectly and seal at first trial.

THE ADVANTAGES

• To feel quieter during the prosthetic rehabilitation, even if they are complex and extended.

• Not to trust on one’s own eyes in order to see the parallelism between the stumps, especially if they are distant from each other.

• To be able to make wax patterns which don’t distort when they are taken off from the stone cast.

FOR THE DENTIST FOR THE DENTAL TECHNICIAN

THE MINI-PARALLELOMETER

It is an instrument for verifying the parallelism between the stumps. It is made of TITANIUM ASTM F136 grade 5 so it is sterilizable. It is composed of two legs, whose length is such that they can achieve all the dental elements that have to be prepared. But, on the whole, it is so little that it can be easily inserted into the oral cavity.

CHARACTERISTICS

• The ends of these legs are endowed with two pivots, whose function is that of showing actual parallelism between the abutment teeth.

• Whatever position the mini-parallelometer assumes, the two legs will always be parallel.

THE MINI-PARALLELOMETER

CHARACTERISTICS

• The legs of the instruments are endowed with growes, within which a screw slides.

• This screw can lock the Parallelometer and/or change the position of the pivots.

THE MINI-PARALLELOMETERCHARACTERISTICS

MOVEMENT AT COMPASS

MOVEMENTPANTOGRAPH

USE AND APPLICATIONS

• When the stumps are distant from each other.

• When the remaining abutment teeth have “migrated” and, consequently, assumed an inclination that is difficult to be covered with prostheses.

• In complete prosthetic rehabilitations.

It is particularly useful:

USE AND APPLICATIONSIt is common knowledge that molars are inclined towards the outside, therefore they tend to diverge from each other.

Compare to incisors, molars are inclined towards the posteriors part of the oral cavity.

UPPER ARCH

• Thanks to this parallelometer, it is possible to find out the discrepancy of axes among the various elements to be covered with prostheses, and, therefore, to accomplish a prosthetic rehabilitation that is apparently complex.


UPPER ARCH


• Inferior molar are nearly always inclined towards the median line of the face. For this reason they prevent the vertical insertion of the prosthetic instruments.

LOWER ARCH


• We can notice the undercut between these abutment teeth. It is the consequence of their movement, due to the lack of elements

LOWER ARCH


• With a simple act, bringing the parallel pivots closer to each other, it is possible to create an axis of insertion. In this way, there is no problem in the construction of the prosthetic bridge.

LOWER ARCH

The extent of the discrepancy is found out…

… prepared stumps. They are perfectly parallel!

RESOLUTION OF THE PROBLEMS• The disparallelism

between the stumps is a long-standing question.

• Unfortunately, some attemps to solve the problem did not meet with a good reception on the dental market.

• The following examples show two instruments invented to solve the question, that are already on the market.

This is a kit, that is applied to the dental chair. It allows the turbine

to behave like a real Parallelometer for laboratory.

It is certainly brilliant! Unfortunately it is

uncomfortable for the patient, who has to keep still on the head-rest through a proper

system of locking. We think it is an high price for him.

Not to rinse his mouth and rest during a long preparation time, it

is inconceivable!

Some years ago the dental market proposed a mirror, on which different parallel lines were carved.The mirror should be inserted into the oral cavity and, externally, the operator winking or closing one eye, should find out the disparallelism between the stumps. But the use of the mirror was limited to the elements on one side in the oral cavity. And mistake of parallax was one of the cause for the lack of correct date.

DENTAL MINIPARALLELOMETER

Its strenght is in its simplicity !An excellent relationship

PRICE-BENEFIT

No discomfort for the patient

Immediate vision of the axis of insertion

With little more than the price of extraction forceps,

an inimitable and indispensable instrument for

precise fixed prostheses.

… indeed, the advantage of being just once under the process for the preparation

of the stumps.

We are studying the possibility that one of the two

parallel pivots may be interchanged with a “marker”. In this way the undercut can

be shown .