DE4131145C1 - Tray for dental bite impressions - has slotted liner closely fitting inside U-shaped tray - Google Patents

Abstract

The dental bite impression tray has a releasably fitted insert which closely fits to the tray wall contours. The insert (7) is made of flexible plastics and is pref. fitted with holding pins (14) which are led through openings (13) in the tray (1). The pins have an enlarged head (15) on the outside of the tray and the insert itself has slots (11) and grasps round the upper rim of the tray (1). USE/ADVANTAGE - Dentistry, bite models. Flexible plastics insert eases removal but retains impression details.

Description

The invention is based on an impression tray for teeth press according to the generic term of claim 1. Such an impression tray is known from DE 36 35 817 C1.

To take dental impressions, be as rigid as possible U-shaped impression trays, mostly made of metal or made Glass fiber reinforced plastics are made, curable Masses filled in, after pressing on the images Harden rows of teeth. When subtracting the impression masses give difficulties because the teeth behind intersections and orientations that differ from Ab direction of pull deviate. This leads to significant Forces to pull are necessary, taking it when pulling come off the impression tray from the impression tray can. This regularly leads to incorrect images.  

A major reason for these difficulties lies in that, after hardening, is still soft-ela plastically deformable impression materials due to the very star the impression masses surrounding the impression on three sides spoons can not move sideways.

There is some improvement with an off guidance according to DE-36 35 817 C1. There is an impression spoon described in which a perforated insert is held releasably. When removing from the mold, the rigid impression trays removed, after that it can be complicated by exposing the lattice-shaped insert with a Knife can be removed from the impression material. Also however, due to the rigid design of the Damage cannot be ruled out.

It is an object of the invention from the known from DE 36 35 817 C1 To improve the pressure spoon so that on the one hand a verbes achieved maximum adhesion of the impression materials to the impression tray can be and that, on the other hand, still demolding with rigid fillings is facilitated.

This object is achieved with the subject matter of claim 1.

The flexible plastic material allows after Take a relatively free ver from the impression tray shaping of the hardened but still soft-elastic Ab pressure masses, so that a largely non-destructive Ent shaping becomes possible. Nevertheless, during the impression perfect retention guaranteed.  

To detachably insert the insert in the impression tray, you can be provided that the impression tray has openings, protrude through the retaining pins on the insert. Before preferably, the holding pins on the outside of the Ab pressure spoon a widened head. To release the on then it is sufficient to remove these heads for example by grinding or cutting, afterwards can be used together with the use if necessary contained impression mass easily from the impression spoon be taken.

It is also particularly advantageous if the use is made by has refractions, since those entering this opening Impression material for a positive interlocking with the Use leads, so that a detachment of the impression mass from Ab pressure spoon is prevented with certainty.

In a preferred embodiment it is provided that the insert grips the upper edge of the impression tray. This will make the upper ones uncomfortable for the patient Edges of the impression tray covered and injuries ver avoided.

The insert can be opened at the open rear end of the impression have a protrusion that matches the jaw shape of the Patients can be adjusted, for example by Ab grind. This can prevent the imprint Impression mass back into the throat of the patient reaches. This adjustment can be individual for each patient ell done so that even with missing teeth in the back There is no risk of impression material leakage in the jaw area is.  

The insert can be made in one piece, but it is under certain circumstances also cheap, the use of several parts to form, then the parts of the insert, for example they can be connected by hinges, preferably with film hinges.

The insert can also only be a part of the impression tray cover so that it is possible with such an insert also take impressions of parts of the jaw, for example from an anterior residual dentition. It is then advantageous if such is not the entire impression spoon filling insert at the ends of the end walls or carries protrusions that fill the impression tray with the impression mass on the area of the insert restrict.

The following description of an exec Example of the invention serves in connection with the Drawing of the detailed explanation. Show it:

Figure 1 is a perspective view of a pressure spoon with an inserted A set.

Fig. 2 is a view of the impression tray of FIG. 1 from below and

Fig. 3 is a view of the spoon of Fig. 2 along line 2-2 .

The impression tray 1 shown in the drawing comprises a substantially U-shaped channel 2 with a bottom 3 and side walls 4 and 5 , which diverge slightly. The gutter 2 is open at both ends.

In the front area of the channel 2 , a sheet-like handle 6 is formed on its bottom, which protrudes slightly obliquely downward from the bottom 3 .

The impression tray described so far is made of metal and is designed to be as stable as possible.

In the open channel 2 , an insert 7 is inserted, which in the exemplary embodiment shown is adapted to the bottom 3 and the two side walls 4 and 5 to match the inner contour of the impression tray 1 . This insert 7 consists of thin-walled plastic material, so that it forms in the channel 2 a lining this on the inside of the second channel, the rock and the bottom and the two side walls 4 and 5 of the Abdrucklöf rock 1 completely covered.

In the bottom 8 and the side walls 9 and 10 of the insert 7 , a larger number of openings 11 are processed so that only narrow webs 12 remain between the openings 11 .

The set of a flexible plastic material 7 is detachably connected to the impression tray 1 . For this purpose there are a larger number of bores or other circular openings 13 in the bottom 3 of the impression tray 1 , through which pins 14 formed on the underside of the bottom 8 of the insert 7 pass. These are riveted to the underside of the bottom 3 with a widened th head 15 which secures the pins 14 against being pulled out of the openings 13 .

The insert 7 shown is formed in one piece, in a modified embodiment not shown in the drawing, for example, the bottom 8 and the side walls 9 and 10 could be formed as separate parts which can be connected to one another by means of film hinges or by means of corresponding latching connections.

The insert 7 ends in the illustrated game Ausführungsbei on the upper edge of the side walls 4 and 5 , in an embodiment not shown, the upper edge of the side walls 9 and 10 of the insert 7 can cover or encompass the upper edge of the side walls 4 and 5 of the impression tray 1 to avoid contact of the possibly sharp-edged upper edges of the side walls 4 and 5 with the patient.

To produce an impression, the impression tray 1 , which is lined with an insert 7, is filled with a hardenable mass which enters the openings 11 in the insert 7 .

After pressing on the row of teeth to be imaged and after the filled mass has hardened, the impression spoon is pulled off together with the mass, detachment of the impression mass from the impression spoon being prevented by the impression mass being interlocked with the insert 7 through entry into the openings 11 is, which in turn is firmly connected to the impression tray 1 by the pins 14 and the heads 15 . Overall, the retention force of the impression compound in the impression tray increases.

After the impression has been taken, the in the impression mass of the negative impressions of the teeth and the jaw can be filled with plaster.

To remove the gypsum positive from the impression compound, it is favorable to remove the insert 7 together with the impression compound from the impression tray 1 . This can be done for example by grinding the heads 15 and pulling out the pins 14 from the openings 13 . After that, it is easily possible to take the gypsum positive out of the impression material, since the impression material, which is not completely brittle, can yield softly and elastically. The lateral evasive movement is no longer hindered in this case by the rigid impression tray 1 , the flexible insert 7 easily allows such lateral evasion, which also enables the removal of a plaster tooth when there are undercuts or if the tooth direction deviates from the trigger direction.

Another advantage of the use of the insert 7 is that when the insert 7 and the impression mass are removed from the impression tray 1, the latter usually completely dissolves from the impression tray 1 , so that a complicated mechanical cleaning of the impression tray 1 can be dispensed with.

In the illustrated embodiment, the insert consists of a thin-walled plastic material. In a modified example, the embodiment not shown in the drawing, the insert can also be designed in the form of a net, only care being taken to ensure that there is good anchoring with the impression tray 1 , which can be released if necessary, so that after the impression has been taken hardened impression material can be removed from the impression tray 1 together with the net.

Claims (9)

1. impression spoon for dental impressions, in which a lying on its inner walls, the contour adapted insert is inserted, which is detachably attached to the impression spoon, characterized in that the insert ( 7 ) consists of flexible plastic. 2. impression tray according to claim 1, characterized in that the impression tray ( 1 ) has openings ( 13 ) through which protrude through the retaining pins ( 14 ) on the insert ( 7 ). 3. impression tray according to claim 2, characterized in that the retaining pins ( 14 ) on the outside of the impression tray ( 1 ) a widened head ( 15 ) tra gene. 4. impression tray according to one of the preceding and workman surface, characterized in that the insert ( 7 ) has openings ( 11 ). 5. impression tray according to one of the preceding and workman surface, characterized in that the insert ( 7 ) engages around the upper edge of the impression tray ( 1 ). 6. impression tray according to one of the preceding Ansprü surface, characterized in that the insert ( 7 ) at the open rear end of the impression tray ( 1 ) has a projection. 7. impression tray according to one of the preceding Ansprü surface, characterized in that the insert ( 7 ) is integrally formed. 8. impression tray according to one of claims 1 to 6, characterized in that the insert ( 7 ) is formed in several parts. 9. impression tray according to claim 8, characterized in that the parts of the insert ( 7 ) are interconnected by hinges.