Snap set technology in the VPS impression materials

Impression of the abutments is a crucial procedure during prosthodontic treatment, as it could directly affect the precision of the cast and the fit of the final restoration. The chemical and physical properties of elastomeric impression materials may influence the accuracy of the final impressions.

Selection of the impression material should take in consider: the consistency and flow properties, ease of handling, the setting time and dimensional stability.

The most used elastomeric impression materials for fixed and  removable prosthodontic restorations are polyvinylsiloxanes (PVS) and polyethers (PE).

Polyvinylsiloxane impression materials provide simplicity, high dimensional stability and accuracy, superior elastic recovery from undercuts and low viscoelastic properties, low distortion, adequate tear strength varying with filler rate and viscosity, high flow characteristics, short setting time, and multiple pouring from one impression.

Impression materials generally require compromises. They either exhibit good flow characteristics or stability.  The VPS-based precision impression material Honigum, however, is different. Thanks to the patented rheologically active matrix Honigum-Light, Honigum-Mono and  Honigum-Heavy by DMG yield best results in both disciplines.And the DMG Putty variants overcome the opposites at exactly the most critical point for the dentist and treatment.
With its unique Snap-Set technology the hand-mix Honigum-Putty combines a comfortable working time with a very short setting time.

styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.1

The chief complaint of the patient was her teeth were too big and the color was not pleasant.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.2

The intra oral aspect of the 11, 21 zirconia oxide ceramic crowns showed, poor cervical adaptation of the crowns, inflammation of the gingiva, inadequate surface contact, high opacity of the restorations, no shape integration in the arch.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.3

The crowns were removed and the composite restorations were replaced.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.4

Two provisionals were fabricated chairside using the initial situation using Luxatemp composite. The shape was changed intra-orally with a direct mock-up according to the adjacent teeth.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.5

The color for the final restoration was taken before taking the impression, before the dehydration of the teeth could occur.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.6

After the healing of the gingiva the buccal margins were placed subgingivally because of the high chromatic color of the abutments. The final finishing of the abutments were made with Arkansas stone.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.7

Finishing of the cervical area were made using the cord retraction in order to protect the epithelial insertion.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.8

The final aspect of the preparation.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.9

After the finishing of the margins, the second retraction cord was placed to displace the the marginal gingiva in the horizontal direction. The second cord should be completely visible after placement from incisal point of view.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.10

The aspect of the gum after the removal of the second cord. The space for the impression material is clearly visible.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.11

For this case I decided to use Honigum (DMG). The light body material is very flowable and will fill all the space made by the second cord.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.12

The putty material is the most flowable material I ever used of its category. Thanks to the Snap-Set technology developed by DMG, the new Honigum-Putty offers a so far unrivaled combination of comfortable working time and short setting time inside mouth. Its generous working time reduces the mixing stress to a minimum. Deformations due to already set material are prevented, and micro movements are reduced by the quicker cross linking. For the patient, the shorter setting time  translates into significantly higher comfort during the procedure.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.13

 Other advantages of this material are:
• Exceptional detail reproduction
• Outstanding stability in the tray and intraorally
• Remarkable flow properties under light pressure
• Balanced hydrophilicity
• Neutral taste and honey scent
A very good impression of the sulcus were obtained using one step wash technique.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.14

After impression, the color of the abutment was taken using natural die material color (ND).
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.15

The aspect of the model.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.16

Isolation with the rubber dam before cementation. In this case, I decided to cement one by one using Variolink Esthetic DC from Ivoclar.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.17

For this case I chose to use a feldspathic ceramic on refractory die for fabrication of the crowns.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.18

The final aspect of the restorations after one month from the cementation.
styleitaliano style italiano DMG impression materials VPS vinyl polysiloxane precision light heavy body putty retraction cord crown abutment thixotropy polyether sulcus prosthodontics

Fig.19

The dentis and the patient were very happy with the final aspect.

Conclusions

1. A good impression material gives high precision of the restoration
2. Snap set technology gives a comfortable working time and short setting time combined.

Bibliography

1. Braden, M., Inglis, A.T. Visco elastic properties of dental elasto-meric impression materials. Biomaterials 1986; 7: 45-8.
2. Craig RG and Sun, Z. Trends in elastomeric impression materials. Operative Dent 1994; 138-45.
3. Chee WW and Donovan TE. Polyvinyl siloxane impression ma-terials: a review of properties and techniques. J Prosthet Dent 1992; 68: 728-32.
4. Mandikos MN. Polyvinyl siloxane impression materials: an update on clinical use. Aust Dent J 1998; 43: 428-34.
5. Lee EA. Impression material selection in contemporary ?xed prosthodontics: technique, rationale, and indications. Compend Contin Educ Dent 2005; 26: 780, 782-4, 786-9

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