Krause Temporary Restoration

The easy and fast way to an aesthetic temporary with system

A temporary represents a significant intermediate step in the manufactory of dental restorations. In the period up to the definitive treatment, it protects the tooth against chemical, biological and physical stimuli.

Dr. Pawel Paszkiewicz Dentist Theresa Krause University Medical Center Hamburg Eppendorf

Many patients expect from their temporary not only the protection and restoration of the chewing function. They also expect optimal aesthetics. An attractive smile with a pleasing tooth position affects the overall appearance. The change of a single front tooth can already influence this in a positive or negative way.

Today, in the dentist-patient communication, the temporary is more important than ever to simulate the desired treatment outcome and to precisely define the expectations of the patient. Temporary restorations are a vivid and time-saving way to make the patient familiar with the function and esthetics of his new dentures.

Applied materials: In the following the clinical application of Harvard TEMP C & B will be explained. This is a temporary material based on multifunctional methacrylic esters free of methyl methacrylate.

It is completed by Harvard PremiumSil Mono, Harvard PremiumFlow, Harvard TEMP Glaze LC and Harvard TEMP Cem:

1) Harvard PremiumSil is a hydrophilic impression material, by which the company Harvard presents a new range of A- silicones. The new Snap Set technology provides a comfortable curing characteristic and is characterized by a high elastic recovery. PremiumSil is therefore particularly well suited for the production of the negative mould for temporary restorations.

2) Harvard PremiumFlow is a flowable, light-curing nano-hybrid composite, which is useful for the individualization of the provisional crown.

3) Harvard TEMP Glaze LC is a light-curing single component varnish to seal and smoothen the surface.

4) Harvard TEMP Cem is a eugenol-free temporary cement. The special feature here is that no residues remain on the core. Instead, the cement adheres fully to the provisional crown when removing the temporary.

 

Case Report: A 29-year-old female patient appeared at the ambulance of our clinic. The crown on tooth 11 was about ten years old, was already recemented even half a year ago and had a marginal gap. Furthermore, a piece of porcelain veneer had chipped off vestibularly, so that the gold framework was cervically visible. (Fig.1)

Optimale Konsistenz von Harvard Bite
Fig. 1
Initial situationdefective crown 11

The patient declared to be particularly with the esthetics of the crown. An all-ceramic crown with a skeleton of zirconia and a veneer of silicate ceramics was planned for a new restoration.

Before removing the insufficient crown, a situation impression with Harvard PremiumSil Mono and a minitray was made. With the double chamber cartridge system, via dispenser, an optimal mixing of the two phases and a simple application of the impression material in the tray was performed. (Fig.2)

Optimale Konsistenz von Harvard Bite
Fig. 2
Filling the minitray

The silicone impression material has a fruity smell, which was perceived by the patient as very pleasant. After 2:30 min, the impression could be removed from the mouth. (Fig.3)

Optimale Konsistenz von Harvard Bite
Fig. 3
Situation impression

Following the removal of the crown, setting of an adhesively bonded fiberglass post with a core build-up made of composite and the re-preparation of the core were performed. (Fig.4)

Optimale Konsistenz von Harvard Bite
Fig. 4
Preparation

Finally, the impression and production of the temporary restoration was performed. Therefore, the situation impression which had been produced before was filled with Harvard Temp C&B in color A1 and placed on the prepared tooth. (Fig.5)

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Fig. 5
Filling of situation impression

The setting in the mouth lasted 2:30 min. Once the material had reached a rubbery state, the impression could be removed from the mouth. Here, the temporary remained in the impression and could be easily removed then. (Fig.6)

Optimale Konsistenz von Harvard Bite
Fig. 6
Removal of the temporary in the rubbery state

The next step was the repositioning on the prepared tooth stump and thereafter, for another minute, the complete curing in hot water. After a total of 5 minutes, the final hardness was reached and the boundary of the temporary could be trimmed by milling after the inhibition layer had been removed with ethanol. (Fig.7)

Optimale Konsistenz von Harvard Bite
Fig. 7
Trimming with a bur
 

For an even more natural coloring, which is desirable especially in the anterior region, the temporary crown was individualized with Harvard PremiumFlow. (Fig.8)

Optimale Konsistenz von Harvard Bite
Fig. 8
Customizing with Harvard PremiumFlow

To match the color in the cervical region Harvard PremiumFlow was applied in the color A2 and then light cured for 15 seconds. As a final preparation step Harvard TEMP Glaze LC was thinly painted onto the surface. Again curing with blue light was performed. (Fig.9 and 10)

Optimale Konsistenz von Harvard Bite
Fig. 9
Sealing of surface with Harvard TEMP Glaze LC
Optimale Konsistenz von Harvard Bite
Fig. 10
Curing with blue light

Due to TEMP Glaze LC the surface appeared naturally shiny and smooth. Thus, time-consuming polishing could be omitted completely. (Fig.11)

Optimale Konsistenz von Harvard Bite
Fig. 11
Finished temporary

Then the completed temporary restoration was filled with Harvard TEMP Cem and repositioned on the tooth stump. (Fig.12)

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Fig. 12
Filling with temporary cement

Durch die Minimix-Spritze erfolgte eine exakte Dosierung und blasenfreie Mischung von Basis und Katalysator. Nach einer Verarbeitungszeit von 1:30 Min. begann das Material abzubinden.

The Minimix syringe provides an exact dosage and bubble- free mixing of base and catalyst. After a working time of 1:30 min, the material began to set. After a complete cure of 3:30 min excess material could be easily removed. (Fig.13)

Optimale Konsistenz von Harvard Bite
Fig. 13
Removal of excess cement

The result was a functional and esthetic high-value temporary restoration. (Fig.14)

Optimale Konsistenz von Harvard Bite
Fig. 14
Final provisional

After two weeks the patient appeared for the insertion of the final restoration. During this period the provisional had neither loosened, nor discolored. The removal proceeded easily. The Harvard TEMP Cem remains without residue in the crown. Therefore an extensive cleaning of the stump was not necessary. (Fig.15)

Optimale Konsistenz von Harvard Bite
Fig. 15
Removal of provisional

The subsequent adjustment and the insertion of the final restoration could therefore be performed timesaving.

Conclusion: The product range Harvard TEMP offers without great effort a sufficient esthetic and high-value functional result for practitioner and patient. The provisional provides for the patient an excellent prediction of the final restoration. If during treatment changes in the form and color are required by the patient they can be implemented by using simple technology in a time-saving manner.

It turns out that the temporary is an important component of the dentist-patient communication. Furthermore, the Harvard product family provides the advantage to the dentist that an extensive core cleaning after removal of the temporary is not necessary.