Abstract
Aim: It aims to provide an easy and efficient method of recording dentulous impressions by adjusting a single tray for various mouth sizes.
 Settings and Design/Methods and Material: Sectioning the maxillary and mandibular tray each in three parts and attaching 3 screws (regular stainless-steel wood screws were used) in the upper and 2 screws in the lower tray was done A demonstration model for the same has been constructed with nickel-titanium screws. The objective of writing the article is to propose the idea and demonstrate the functioning of the tray.
 Results: The trays were sectioned, screwing and unscrewing was done (with-Taparia flat tip mini head screw driver - 10.0 x 1.2 mm) and change in tray size from number 1 to 4 and vice-versa was observed. Matrix bands were placed on the sides to provide stability to the tray and to prevent movement of the sectioned parts while in use.
 Conclusion: The expandable tray is an easy and effective method of recording impressions. It can be easily modified according to the clinical scenario saving on valuable clinical time and effort.
 Keywords: expandable tray, dentulous tray, impression making, modified perforated tray, adjustable tray
Highlights
In a study conducted in Azeezia college, Kerala on ‘A comparative evaluation of plastic and metal impression trays on the accuracy of cast’, concluded that metal impression trays were more accurate in making impressions but the data was statistically comparable with plastic stock trays
The impression material used in our research model is alginate
Making a good impression is the key to a good prosthesis
Summary
The choice of the impression material used depends on the purpose of impression making (Primary or Secondary), the tray used, operator’s preference etc. Alginate is the most commonly used impression material; it is economical, simple and an indispensable part of clinical dental practice. Though custom-made impression trays minimize distortion and material wastage, clinicians prefer using stock trays owing to time constraints and to reduce patient chairside time [1]. Stock trays used in dental practice may be metallic (aluminium or stainless steel) or non-metallic (plastic). The most commonly used stock trays are stainless steel due to their rigidity, ease of availability and economical concerns. In a study conducted in Azeezia college, Kerala on ‘A comparative evaluation of plastic and metal impression trays on the accuracy of cast’, concluded that metal impression trays were more accurate in making impressions but the data was statistically comparable with plastic stock trays
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