Influence of Mixing Methods, Special Trays and Storage Time on the Accuracy of two Elastomeric Impressions
El Tawiel, N., El-Hossary, M., Essam, E. (2016). Influence of Mixing Methods, Special Trays and Storage Time on the Accuracy of two Elastomeric Impressions. EKB Journal Management System, 3(2), 111-118. doi: 10.21608/adjg.2016.5076
Noha El Tawiel; Mohamed El-Hossary; Eman Essam. "Influence of Mixing Methods, Special Trays and Storage Time on the Accuracy of two Elastomeric Impressions". EKB Journal Management System, 3, 2, 2016, 111-118. doi: 10.21608/adjg.2016.5076
El Tawiel, N., El-Hossary, M., Essam, E. (2016). 'Influence of Mixing Methods, Special Trays and Storage Time on the Accuracy of two Elastomeric Impressions', EKB Journal Management System, 3(2), pp. 111-118. doi: 10.21608/adjg.2016.5076
El Tawiel, N., El-Hossary, M., Essam, E. Influence of Mixing Methods, Special Trays and Storage Time on the Accuracy of two Elastomeric Impressions. EKB Journal Management System, 2016; 3(2): 111-118. doi: 10.21608/adjg.2016.5076

Influence of Mixing Methods, Special Trays and Storage Time on the Accuracy of two Elastomeric Impressions

Al-Azhar Dental Journal for Girls
Article 4, Volume 3, Issue 2, April 2016, Page 111-118  XML PDF (344.08 K)
Document Type: Original Article
DOI: 10.21608/adjg.2016.5076
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Authors
Noha El Tawiel1; Mohamed El-Hossary2; Eman Essam3
1B.D.S Tanta University, 2005, Dentist in Al Zahraa Hospital.
2Professor of Crowns and Bridges, Faculty of Dental Medicine “Boys” Cairo,Al-Azhar University.
3Associate Professor, Crowns and Bridges Department, Faculty of Dental Medicine, Al-Azhar University, Girls’ Branch.
Abstract
This in-vitro study investigated the dimensional accuracy and stability of polyether and polyvinylsiloxane impression materials. The study included the effect of mixing methods where conventional mix versus auto-mixing technique, the effect of special tray on the accuracy of impression and pouring the impressions at different times of storage (1hour, 48 hours and 7 days). Impressions were made for a master model cast of mandibular arch with two prepared abutments; right second premolar and right second molar with a shoulder finish line made as to give a definite margin that was easily
defined where there was an occlusal shoulder and gingival shoulder used for occlusogingival (O-G) measurements. There was an occlusal holes made on occlusal surface of both teeth to be used as a reference points for inter-abutment distance record of the prepared abutments. All dimensions were measured on casts retrieved from impressions made on master model. The impressions were then poured with extra-hard stone into stone casts, according to times under investigations. The results revealed that the polyether elastomeric impression material presented a higher degree of accuracy than
vinylpolysiloxane. The automixing technique showed better results than conventional mixing, while the light- cured special tray presented slightly better dimensions. Also, the one- hour pouring time presented the best dimensions, while two- days and sevendays pouring times had almost the same dimensions.
Keywords
Elastomeric impression materials; Special trays; Dimensional change
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