Dental Materials DA122. Two parts ◦ Anatomic portion Created from the alginateimpression-the teeth ◦ Art portion Forms the base of the model

Pouring andTrimming Dental Models

Dental Materials DA122

Two parts◦Anatomic portion Created from the alginateimpression-the teeth

◦Art portion Forms the base of the model

Two Parts

Fig. 47-8 Anatomic and art portions of a dental model.

Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.

Double-pour method◦ The anatomic portion of the model is poured first;

then a second mix of plaster or stone is used to prepare the art portion.

Box-and-pour method◦ The impression is surrounded with a “box” made

of wax and poured as one unit. Inverted-pour method

◦ One large batch of plaster or stone is mixed and both portions of the model are poured in a single step.

Different Pouring Methods


Fig. 47-9 Examples of pouring methods.


Prepare the model◦ Soak it in water for 5 minutes.

Trimming the maxillary model ◦ Trim the base.◦ Trim the posterior area.◦ Trim the sides.◦ Trim the heel cuts.◦ Trim the angled portion from canine to canine

(comes to a point between 8 + 9)(Cont’d)

Trimming and Finishing of Dental Models


(Cont’d)

Trimming the mandibular model◦ Trim the posterior portion of the mandibular

model until it is even with the maxillary model.◦ Trim the base.◦ Trim the lateral cuts to match the maxillary lateral

cuts.◦ Trim the back and heel cuts.◦ Trim from canine to canine in a rounded form.(Cont’d)



(Cont’d)

Finishing the model ◦ Mix a slurry of gypsum and fill in any voids.

Polishing a plaster model ◦ Soak the model in a soapy solution for 24 hours.◦ Dry the model and then polish it with a soft cloth.



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Dental Materials DA122. Two parts ◦ Anatomic portion Created from the alginateimpression-the teeth ◦ Art portion Forms the base of the model