Effects of Disinfection of Combined Agar/Alginate Impressions on the Dimensional Accuracy of Stone Casts

Abstract

This study investigated the effects of disinfection of combined agar/alginate impressions on the dimensional accuracy of resultant stone casts. Impressions of a master cast designed to simulate an abutment tooth were prepared by combining each of two brands of cartridge-form agar impression materials with an alginate impression material. The impressions were immersed in 1％ sodium hypochlorite for 10 minutes or 2％ glutaraldehyde for 30 minutes. The remaining impressions were sprayed with these two disinfectants and then stored in sealed bags for 10, 30, 60, and 120 minutes. Stone casts obtained from the non-disinfected impressions were also prepared as control. Changes in diameter of the stone casts were then measured. Results indicated that storage for 10 minutes after spraying with 1％ sodium hypochlorite was an appropriate disinfection method for combined agar/alginate impressions, as well as immersion in 1％ sodium hypochlorite for 10 minutes.

Accuracy assessment of three-dimensional surface reconstructions of teeth from Cone Beam Computed Tomography scans

“…Other techniques proposed to acquire 3D surface models of the crowns include 3D surface scanning of the dental impressions and casts. However, the accuracy of this approach is limited by the accuracy of the impression or dental cast, which can be influenced by many factors including impression material type, tray type, impression technique, pouring technique, storage time, disinfection material and the presence of deep undercut and severely mal‐posed or tilted teeth (35–48). Albeit in an ideally controlled situation, the accuracy of dental impressions can be within 25 μm (49).…”

Surface detail reproduction and dimensional accuracy of stone models: influence of disinfectant solutions and alginate impression materials

“…It is recommended that the impressions be stored in sealed bags following treatment with glutaraldehyde or NaOCl (1,15). Glutaraldehyde is considered a high-level disinfectant (16) that should eliminate some spores, the bacillus responsible for tuberculosis, vegetative bacteria, fungi, and viruses.…”

Proteti̇k Di̇ş Tedavi̇si̇nde Dezenfeksi̇yon Ve Steri̇li̇zasyon

“…34 Irreversible hidrokolloid ölçü materyali, sodyum hipoklorit ve glutaraldehit dezenfeksiyon solüsyonla-rıyla hem spreyleme hem daldırma yöntemi ile dezenfekte edilmiĢ, hacimsel stabilite açısından en uygun yöntemin sodyum hipoklorit ile spreylendikten sonra 10 dk ağzı kilitli poĢette bekletilmesi olduğu belirtilmiĢtir. 35 Muzaffar ve arkadaĢları iki farklı marka aljinatı distile su, sodyum hipoklorit ve Perform ID olmak üzere üç ayrı solüsyonda bekletmiĢler ve tüm örneklerde büzülme olduğunu bildirmiĢlerdir. 31 Irreversible hidrokolloid örnekler bakteri ile kontamine edilmiĢ ardından sodyum hipoklorit, hidrojen peroksit ve alkol bazlı solüsyonlarla sprey yöntemiyle dezenfekte edilip 10 dk ağzı kilitli bir poĢette bekletilmiĢlerdir.…”