@Article{, title={The effect of using sectional stock tray on the accuracy of gypsum cast}, author={Nadira A HATIM and Sawsan H AL-JUBORI}, journal={Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان}, volume={1}, number={3}, pages={S257-S266}, year={2001}, abstract={Patients with restricted mouth opening are a common occurrence in prosthodontic practice. Sectional impression technique was simplified manipulation and decreased patient's trauma. The aim of study is to compare between the impression done by using sectional and full arch stock trays, and to evaluate volumetric changes in the abutments of partially edentulous arch and the linear dimensional changes between the abutments of stone casts at different intervals of time.The measurements were done by using 3D (IOTA 1203, DEA) machine on (80) die stone casts prepared after taking an impression (two-step technique) of hand mix Dorisil and Supersil addition silicone impression materials using a special mold and test apparatus.There was low significance in the volumetric differences among casts produced from sectional stock trays in relation to that produced from full arch stock trays. Little linear dimensional changes between abutments of casts prepared from sectional stock tray of an average 0.031mm were found. According to these results, sectional trays can be used instead of full arch trays in clinical cases of restricted mouth opening.

} }