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Avicenna Journal of Dental Research، جلد ۵، شماره ۱، صفحات ۰-۰
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| عنوان فارسی |
Effect of Contact Time Between Silicone Impression Materials and Stone on Dimensional Stability of Resultant Cast |
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| چکیده فارسی مقاله |
Background Numerous factors have an effect on the accuracy of an impression and resultant cast, and these include: impression material, impression technique, tray selection, impression disinfection, storage time of impression before pouring, stone type used for fabrication of cast. Up to now, there has been little research conducted on the effect of contact time of a cast with an impression, on the dimensional stability of a cast. Objectives The purpose of this study was to evaluate the effect of the contact time of silicone impression materials with stone casts, on the dimensional stability of resultant casts. Materials and Methods A total of 44 impressions were made from a stainless steel master model, with each one of two silicone impression materials (Elite HD+ and Speedex), and poured with Elite Master Type IV. The thickness of the light-body material (1 mm) was provided by using four copings. The resulting casts from each material were placed in four groups(n = 11) after each contact time with the impression (1 hour, 24 hours, 48 hours, 1 week). Distance between anterior and posterior abutments was measured for the casts and master model. Data were analyzed by two-way analysis of variance and a Tukey test. Results The relationship between the dimensional stability of the casts and the simultaneous effect of the impression material and contact time of the cast with the impression was not statistically significant (P = 0.099). Type of impression material on the dimensional stability of the cast had no significant effect (P = 0.163). Increased contact time of the cast with the impression resulted in increased dimensional change (P < 0.001). Conclusions Dimensional stability of the casts after different contact time with the impression was acceptable. The best time to separate the cast from the impression was one hour after pouring the impression. |
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| کلیدواژه‌های فارسی مقاله |
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| عنوان انگلیسی |
Effect of Contact Time Between Silicone Impression Materials and Stone on Dimensional Stability of Resultant Cast |
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| چکیده انگلیسی مقاله |
Background Numerous factors have an effect on the accuracy of an impression and resultant cast, and these include: impression material, impression technique, tray selection, impression disinfection, storage time of impression before pouring, stone type used for fabrication of cast. Up to now, there has been little research conducted on the effect of contact time of a cast with an impression, on the dimensional stability of a cast. Objectives The purpose of this study was to evaluate the effect of the contact time of silicone impression materials with stone casts, on the dimensional stability of resultant casts. Materials and Methods A total of 44 impressions were made from a stainless steel master model, with each one of two silicone impression materials (Elite HD+ and Speedex), and poured with Elite Master Type IV. The thickness of the light-body material (1 mm) was provided by using four copings. The resulting casts from each material were placed in four groups(n = 11) after each contact time with the impression (1 hour, 24 hours, 48 hours, 1 week). Distance between anterior and posterior abutments was measured for the casts and master model. Data were analyzed by two-way analysis of variance and a Tukey test. Results The relationship between the dimensional stability of the casts and the simultaneous effect of the impression material and contact time of the cast with the impression was not statistically significant (P = 0.099). Type of impression material on the dimensional stability of the cast had no significant effect (P = 0.163). Increased contact time of the cast with the impression resulted in increased dimensional change (P < 0.001). Conclusions Dimensional stability of the casts after different contact time with the impression was acceptable. The best time to separate the cast from the impression was one hour after pouring the impression. |
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| کلیدواژه‌های انگلیسی مقاله |
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| نویسندگان مقاله |
بیژن حیدری | bijan heidari
department of prosthodontics, school of dentistry, hamadan university of medical sciences, hamadan, ir iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی همدان (Hamadan university of medical sciences)
فریبرز وفایی | fariborz vafaei
department of prosthodontics, school of dentistry, hamadan university of medical sciences, hamadan, ir iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی همدان (Hamadan university of medical sciences)
علیرضا ایزدی | alireza izadi
department of prosthodontics, school of dentistry, hamadan university of medical sciences, hamadan, ir iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی همدان (Hamadan university of medical sciences)
امیر صالح | amir saleh
department of prosthodontics, school of dentistry, hamadan university of medical sciences, hamadan, ir iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی همدان (Hamadan university of medical sciences)
زهرا dehbani | zahra dehbani
private dentistry, hamadan, ir iran
سارا خزایی | sara khazaei
department of prosthodontics, school of dentistry, hamadan university of medical sciences, hamadan, ir iran; department of prosthodontics, school of dentistry, hamadan university of medical sciences, hamadan, ir iran. tel 98-9187048221, fax 98-8138354220
سازمان اصلی تایید شده: دانشگاه علوم پزشکی همدان (Hamadan university of medical sciences)
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| نشانی اینترنتی |
http://www.avicennajdr.com/index.php?page=article&article_id=20937 |
| فایل مقاله |
فایلی برای مقاله ذخیره نشده است |
| کد مقاله (doi) |
10.17795/ajdr-20937 |
| زبان مقاله منتشر شده |
fa |
| موضوعات مقاله منتشر شده |
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| نوع مقاله منتشر شده |
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