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#First impression dental how to#

The square ("box") trays are for the partially dentate and the rounded trays are for the edentulous.

For upper impressions, stand behind the patient and lower the chair to elbow height.

For lower impressions, raise the chair so the mouth is at a level somewhere between elbow and shoulder height.

Get the easy one done first and it will be easier for the patient, instead of making them worry that the second one will be just as bad.

Lower impressions are done first as they are less likely to cause gagging.

Finally, it is easier for the clinician to position the loaded trays in the mouth if they are standing up. The orofacial musculature is also slightly effected by lying flat or with the head held upright. Do not make impressions with the patient lying flat as it will cause more material to run to the back of the mouth and hence more stimulation of the gag reflex. Impression are taken with the clinician standing up and the patient sitting upright in the dental chair. Get the chair into the correct position.Make sure the patient is wearing a bib as some impression materials will leave permanent marks on patients' clothing.Reassure patient that material will be in the mouth for only a few minutes, and they can breathe through their nose throughout.Impression materials can be likened to plaster of Paris. Explain what is going to happen in terms they will understand ("take a mould/cast of your mouth to build the denture on").If 2 impressions are being carried out, first impressions are often not considered important, but the quality of the special tray is dependent upon the first impression. Most of the time this will give acceptable results, as long as the technique is good. However, it should be noted that in general practice most dentists only bother with one impression because it saves time. This page will divide impressions into preliminary/first impressions and second impressions, as is taught in dental schools since this method is more accurate. It is easy to see how a denture made on a study model which is not representative of the morphology of the patient's denture bearing area will have problems. The dentures are made to fit the study model. The dentures are made in the laboratory, and the technician/denturist has no physical access to the patient.

Impressions are one of the most important stages in the construction of dentures.

#First impression dental how to#

This is a learning resource about how to make impressions, for information regarding impression materials, please review the Wikipedia article on dental impression materials.