Dimensional changes of commercial and novel polyvinyl siloxane impression materials following sodium hypochlorite disinfection

PeerJ

article

Shahab Ud Din¹  Muhammad Sajid²  Asfia Saeed²  Farooq Ahmad Chaudhary¹  Mohammad Khursheed Alam³  Juneda Sarfraz¹  Bilal Ahmed¹  Mangala Patel⁴ 

[1] School of Dentistry ,(SOD), Federal Medical Teaching Institution ,(FMTI)/PIMS, Shaheed Zulfiqar Ali Bhutto Medical University;Department of Dental Materials, Islamabad Medical & Dental College;Preventive Dentistry Department, College of Dentistry, Jouf University;Centre for Oral Bioengineering ,(Dental Physical Sciences Unit), Bart’s and The London School of Medicine and Dentistry, Queen Mary University of London

关键词: Impression materials;    Vinyl polysiloxane;    Disinfection;    Sodium hypochlorite;    Dimensional changes;   

DOI  :  10.7717/peerj.12812

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Background Dental impressions are used to record anatomy of teeth and surrounding oral structures. Impression materials become contaminated with saliva and blood requiring disinfection, which may have negative impact on dimensional stability of materials. Objective Comparatively evaluate linear dimensional changes of synthesized Tetra-functional (dimethylsilyl) orthosilicate (TFDMOS) containing Polyvinylsiloxane (PVS) impressions following sodium hypochlorite disinfection. Methods Percentage dimensional changes of three commercial PVS (Elite HD Monophase, Extrude and Aquasil Ultra Monophase) and five experimental PVS impression materials were measured. Experimental material contained novel cross-linking agent (TFDMOS) and a non-ionic surfactant (Rhodasurf CET-2) that is Exp-A (without TFDMOS), Exp-B (with TFDMOS), Exp-C (TFDMOS+ 2% Rhodasurf CET-2), Exp-D (TFDMOS+ 2.5% Rhodasurf CET-2) Exp-E (TFDMOS+ 3% Rhodasurf CET-2). Samples were made using rectangular stainless-steel molds (40 × 10 × 3 mm3) and linear dimensional changes were measured using a calibrated travelling microscope at 10× magnification after immersion in distilled water (D.W) and 1% Sodium Hypochlorite solution at two different time intervals i.e., 30 min and 24 h. Results Samples immersed in 1% NaOCl showed significant (p < 0.05) dimensional changes after 30 min of immersion. Exp-E showed significantly greater dimensional changes than their control (Exp-A and Exp-B). In distilled water, there were no significant difference among the tested materials. Aquasil exhibited highest expansion (0.06%) in both solutions. At 24 h, among the commercial materials, Extrude had the greatest expansion followed by Aquasil and Elite in DW while Aquasil showed the greatest expansion followed by Extrude and Elite in NaOCl. Conclusion Experimental PVS had linear dimensional changes within the ISO 4823; 2015 recommended range. However, extended immersion can negatively affect the linear dimensions.

【 授权许可】

CC BY