![]() ![]() Taken either by the dentist or the expanded-function dental assistantĪ Preliminary Impression – is used to record a negative reproduction of teeth and surrounding tissues when exact detail of every surface of the teeth or irregularity in tissue is not critical. This impression is used to create a diagnostic cast/model, to make a custom tray for prosthetic procedures, to assist in making provisional coverage, in orthodontic appliance fabrication or To demonstrate visually to the patient a dental care plan or clinical treatment plan.To aid in the construction of a prosthesis. ![]() To enable observation of the patient’s occlusal relationship.To assist in notation of missing teeth, size, shape, eruptions, tilting, drifting or closed spaces on the dental chart.To compare the current oral status with normal conditions for diagnostic purposes.To assist in verification of findings made in a clinical observation.To provide a permanent record of the oral cavity on the date of the impression.The functions and uses of impressions in dental procedures are: Accurate study casts is in order to reproduce the teeth, gingiva and adjacent structures, it is essential that the impression or negative reproduction of the oral cavity be accurate before a positive reproduction or study cast/model is of use to the dentist. ![]()
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