Effect of immersion disinfection of alginate impressions in sodium hypochlorite solution on the dimensional changes of stone models

Abstract

This study investigated the effect of the immersion of alginate impressions in 0.5% sodium hypochlorite solution for 15 min on the dimensional changes of stone models designed to simulate a sectional form of a residual ridge. Five brands of alginate impression materials, which underwent various dimensional changes in water, were used. A stone model made with an impression that had not been immersed was prepared as a control. The immersion of two brands of alginate impressions that underwent small dimensional changes in water did not lead to serious deformation of the stone models, and the differences in the dimensional changes between the stone models produced with disinfected impressions and those of the control were less than 15 µm. In contrast, the immersions of three brands of alginate impressions that underwent comparatively large dimensional changes in water caused deformation of the stone models.

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

“…Disinfectants must be effective as antimicrobial agents while not adversely affecting the dimensional accuracy or feature fidelity of the impression material and the resulting gypsum cast (7). The American Dental Association (ADA) recommends that alginate impressions be sprayed with an ADA-approved disinfectant and then sealed in a plastic bag for the recommended disinfection time (1,2). Spray disinfection of alginate impressions with 1% sodium hypochlorite (NaOCl) or 2% glutaraldehyde reportedly did not cause adverse dimensional changes or surface deterioration of stone models produced from the impressions (2,8).…”

“…Disinfection of tools and materials is an important step in dental procedures (1)(2)(3). In the absence of disinfection, treatment procedures can expose dentists, hygienists and laboratory workers to direct or crosscontamination (4,5).…”

Disinfection of Dental Impressions and Effects of Disinfectants on Dental Impressions

“…Boyutsal değişimin 15 µm'den az olduğu ve genel kanının aksine bu çalışmada daldırma yönteminin aljinat ölçü maddelerinin dezenfeksiyonunda kullanılabilir bir yöntem olduğu öne sürülmüştür. 37 Dezenfeksiyon yönteminin, aljinat ölçü maddelerinin sağladığı yüzey detayı üzerindeki etkisinin incelendiği bir araştırmada, ölçüler sodyum hipoklorit solüsyonunda 1, 5 ve 10 dakika bekletilerek veya 6, 12 ve 18 dakika boyunca ultraviyole uygulanarak dezenfekte edilmiştir. Kontrol grubu ile karşılaştırıldığında, test edilen gruplarda yüzey detayı açısından istatistiksel olarak anlamlı bir fark gösterilmemiştir.…”

Saklama Şartlarının ve Sürelerinin İrreversible Hidrokolloid Ölçü Maddelerinin Boyutsal Stabilitesi Üzerine Etkileri

“…Quality of diagnostic stone models has a critical role in the orthodontic treatment plan and evaluation of the treatment results. 4,5 The aim of this study was to evaluate the dimensional stability of five irreversible hydrocolloid impression materials according to the different storage condition and periods. The null hypothesis of this study was that the storage conditions and periods would not affect the dimensional stability of irreversible hydrocolloid impression materials.…”

“…1 Some factors such as type of impression material 4 and impression tray, storage condition and storage period can affect the dimensional stability of irreversible impression materials and hence the accuracy of diagnostic stone models. Quality of diagnostic stone models has a critical role in the orthodontic treatment plan and evaluation of the treatment results.…”