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Paper Information

Journal:   FRONTIERS IN DENTISTRY (JOURNAL OF DENTISTRY OF TEHRAN UNIVERSITY OF MEDICAL SCIENCES)   JULY 2014 , Volume 11 , Number 4; Page(s) 398 To 405.
 
Paper: 

DIMENSIONAL CHANGES OF ACRYLIC RESIN DENTURE BASES: CONVENTIONAL VERSUS INJECTION-MOLDING TECHNIQUE

 
 
Author(s):  GHARECHAHI JAFAR, ASADZADEH NAFISEH, SHAHABIAN FOAD, GHARECHAHI MARYAM*
 
* DEPARTMENT OF ENDODONTIC, DENTAL RESEARCH CENTER, SCHOOL OF DENTISTRY, MASHHAD UNIVERSITY OF MEDICAL SCIENCES, MASHHAD, IRAN
 
Abstract: 

Objective: Acrylic resin denture bases undergo dimensional changes during polymerization. Injection molding techniques are reported to reduce these changes and thereby improve physical properties of denture bases. The aim of this study was to compare dimensional changes of specimens processed by conventional and injection-molding techniques.
Materials and Methods: SR-Ivocap Triplex Hot resin was used for conventional pressure-packed and SR-Ivocap High Impact was used for injection-molding techniques. After processing, all the specimens were stored in distilled water at room temperature until measured. For dimensional accuracy evaluation, measurements were recorded at 24-hour, 48-hour and 12-day intervals using a digital caliper with an accuracy of 0.01 mm. Statistical analysis was carried out by SPSS (SPSS Inc., Chicago, IL, USA) using t-test and repeated-measures ANOVA. Statistical significance was defined at P<0.05.
Results: After each water storage period, the acrylic specimens produced by injection exhibited less dimensional changes compared to those produced by the conventional technique. Curing shrinkage was compensated by water sorption with an increase in wa-ter storage time decreasing dimensional changes.
Conclusion: Within the limitations of this study, dimensional changes of acrylic resin specimens were influenced by the molding technique used and SR-Ivocap injection procedure exhibited higher dimensional accuracy compared to conventional molding.

 
Keyword(s): ACRYLIC RESIN, DENTURE BASE, PHYSICAL PROCESSES
 
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