Trimming the Impression
Trim down the impression to seat evenly on the tray.
Model Release Spray
To ensure ease of removal of the set model, spray the inside of the Tray with an appropriate Model Release Spray. Shake the spray can before use and apply a thin even coat from a distance of about 250mm.
Mix Die Stone
Mix the die stone following manufacturer’s recommendations.
Pouring the Impression
Pour and fill the impression with die stone in the usual manner.
Pouring the Tray
Pour and fill the Tray with die stone level with the top edge of the tray. Do not over fill the Tray or the impression as it increases the amount of die stone used as well as the time necessary for trimming the model. Invert the impression onto the tray before stone begins to set and position it so that the anterior teeth are placed centrally close to the edge of the tray. Ensure distal section of impression is backed with die stone. Trim and wash off excess die stone.
Smoothing the Model
To reduce the time necessary to trim set models it is advisable to smooth the model whilst the die stone is still ‘plastic’. After the initial set of the die stone, wet a finger and gently smooth away any excess die stone on the outer part of the Tray and also contour the heels of the model. At this stage this will take seconds to achieve and is much easier to work with than completely set die stone.
Removing the Impression
The Tray has been designed in a way that it can contain the liquid die stone during the pouring cycle and to be removed once the die stone has set. After the die stone has set, remove the impression in the usual manner.
Model Removal from the Tray
Hold the Tray with the thumb and fore finger, and supporting the underneath of the tray with the other fingers, gently tap at model release points using a small hammer. The Model is gradually released from the Tray. Do NOT use excessive force, this is not necessary and may damage the model. Repeat this process until the model releases from the tray. Trim as necessary any excessive die stone to produce a neat, tidy model. Do not trim the full depth vertical locating grooves and horizontal grooves, these ensure the dies are relocated in their original casting position.
Sawing the model
Hold using a fine separating saw blade and saw through the model to separate the preps and pontics. Avoid leaving excessively long model segments, particularly when the model is used for a single unit as this will cause problems when re-seating the model into the Tray. The simple solution is to make an extra saw cut in the model to reduce excessive segment length. This method allows for a more even expansion of the whole model and helps to avoid re-seating problems.
Final Preparation of the model
Remove any model dust and replace the sections into the Tray. Hold the tray and the model sections from above and give the base of the tray a short, sharp, knock on the worktop to settle the model sections and to ensure that all the sections are fully seated. Locking straps ensure complete die stability. For articulation use the pocket type articulators, simply slide the small T shaped projection into the pocket of the articulator. To subsequently remove all the model sections from the tray, release the articulator and place the Tray on the bench top so that the shaped segments are facing upwards. Remove locating straps and the segments will be released from the Tray. Single sections can be easily pulled out by hand from the Tray.
