Making of Impression

1. The importance of a good impression cannot be understated in lingual orthodontics.
2. Good impressions will have a crucial effect on the fit and accuracy of the lingual matrix brackets.
3. Precise impressions will reduce positioning errors and hence improve treatment end result.
4. Sending impressions is much more durable during transport as there is no fear of breakage of models or teeth.
5. We hence recommend the following procedure from various aspects of precision and clinical handling to maximize your comfort during treatment.

Clinical Procedure For Impression Taking With Silicone (popularly called rubber base impression material)

1. Select the correct tray size.
2. Mix the Heavy body materials according to the instruction.
3. Apply the space maintainer foil (cling film available for food is good), then shorten it distally with a pair of scissors to tray size.
4. Check the cut impression for floating parts before air - drying it.
5. Fit the mixing gun for the light bodied material and fill in the tray with correction material.
6. Follow manufacturer's instruction for working and setting time.
7. Read the impression.
   1. All teeth should be clearly impressed without any air bubbles.
   2. Not only the teeth but also the gingival margins is reliably precisely impressed - it helps in defining the long axis of the tooth.
   3. In case of doubt double check by pouring a model in stone / plaster for the quality of impression

Important Instructions For Model Production Using Alginate Impressions

1. A die stone plaster has proved to work satisfactorily. Class 4 super - hard plaster is much more difficult to insulate due to the higher density to the surface texture and should therefore not be used.
2. The models should be absolutely non-porus.
3. If you pour up and impression twice, please indicate which one is the first. It is usually more precise and is therefore used as the bonding model in the positioning process.
4. Always control the models personally before sending them away.
5. Always pack the models carefully so that no teeth can fracture.