Effects of immersion disinfection of agar-alginate combined impressions on the surface properties of stone casts

Iwasaki, Yoshiyuki; Hiraguchi, Hisako; Iwasaki, Eriko; Yoneyama, Takayuki

doi:10.4012/dmj.2015-163

Cited by 15 publications

(7 citation statements)

References 13 publications

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“…caused by different reasons [62, 63]. Taking into account the conditions encountered in clinical practice, unfortunately, data is lacking on the effects of procedure delay [64]. Frequently, an alginate impression is placed in plastic bags with moist cotton, but the delayed delivery to the DL of inadequately disinfected impressions could allow for microbial growth during storage.…”

Section: Resultsmentioning

confidence: 99%

Innovation by Computer-Aided Design/Computer-Aided Manufacturing Technology: A Look at Infection Prevention in Dental Settings

Barenghi¹,

Barenghi

Cadeo

et al. 2019

BioMed Research International

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Recent data indicates limited awareness and compliance on infection prevention procedures by dental offices and by dental laboratories. Guidelines for infection prevention in dentistry have been published by Centres for Disease Control and Prevention since 2003; the section “IX-Special consideration” includes a subsection concerning the prevention in dental laboratories, but it has not been modernised in later versions to fit the needs of traditional and computer-aided technology. Traditional techniques required disinfecting items (impression, chewing waxes, and appliances) with well-suited products, which are also chosen for limiting impression changes or appliance deterioration. Effective procedures are available with difficulties. Some of these contain irritant or non-eco-friendly disinfectants. The transport of impression, to dental laboratories, is often delayed with limited precautions for limiting cross-infection. Gypsum casts are frequently contaminated mainly by bacteria and their antibiotic-resistant strains and even stored for long periods during dental implant supported restoration and orthodontic therapy, becoming a hidden source of infection. Nowadays, computer-aided design/computer-aided manufacturing technology seems to be an interesting way to promote both business and safety, being more comfortable for patients and more accurate than traditional technology. A further advantage is easier infection prevention since, for the most part, mainly digital impression and casts are not a source of cross-infection and the transport of contaminated items is reduced and limited to try-in stages. Nevertheless, a peculiar feature is that a digital electronic file is of course unalterable, but may be ruined by a computer virus. Additionally, the reconditioning of scanner tips is determinant for the optical characteristics and long term use of the scanner, but information for its reconditioning from producers is often limited. This study focuses on some critical points including (a) insufficient guidelines, (b) choice of proper procedure for scanner reconditioning, and (c) data protection in relation to patient privacy.

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Section: Resultsmentioning

confidence: 99%

Innovation by Computer-Aided Design/Computer-Aided Manufacturing Technology: A Look at Infection Prevention in Dental Settings

Barenghi¹,

Barenghi

Cadeo

et al. 2019

BioMed Research International

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“…In the present study, electron microscopic images of gypsum surfaces after the immersion of alginate impression material in SDIC for 30 min showed no significant differences from those that were not immersed. Iwasaki (Iwasaki et al, 2016) reported that the immersion of agar-alginate combined impressions in ortho phthalaldehyde solution even for 1 min degraded the surface properties of the resulting stone casts, whereas an immersion in 0.5% NaClO solution did not have any serious adverse effects. Therefore, a 30-min immersion in the 1,000 ppm SDIC solution is considered to be a suitable disinfection method for the surface structures of dental casts.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Antimicrobial Effects on Dental Impression Materials and Biofilm Removal by Sodium Dichloroisocyanurate

et al. 2021

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Dental materials are inevitably contaminated with oral microorganisms. To prevent transmission of infectious diseases, impressions need to be disinfected. In the present study, we examined the disinfection effects on impression materials and biofilm removal by sodium dichloroisocyanurate (SDIC) . Exponentially growing Streptococcus mutans, Escherichia coli, Staphylococcus aureus and Candida albicans, and dental plaque bacteria were suspended in phosphate buffered saline (PBS) and exposed for 1, 5 and 10 min to 1 mL of the 10 ppm, 100 ppm, 1,000 ppm, and 10,000 ppm SDIC solutions. The bactericidal effect was evaluated by colony forming units of each microorganisms. Moreover, the effect of SDIC solution on S. mutans biofilm was examined. Bactericidal effects of SDIC solutions on oral bacteria on dental impression surfaces were assessed and the surface quality of dental casts after immersion in SDIC solution for 30 min was observed under a scanning electron microscope. The number of all bacterial strains, including plaque bacteria, were significantly decreased by SDIC solution treatment in a dose-dependent manner. Significant S. mutans biofilm removing activity of SDIC was observed in 1,000 and 10,000 ppm solution. The number of oral bacteria adhering to the surfaces of impressions markedly decreased following 10-min immersion in the 1,000 ppm SDIC solution. The 30-min immersion of dental impression in the 1,000 ppm SDIC solution did not adversely affect the surface roughness of dental casts. The results indicate that SDIC Solution is useful to deactivate oral bacteria on dental impression.

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“…Other studies investigated the disinfection of dental impression materials. One of them was the Iwasaki et al study that evaluated the surface roughness observed on the Scanned Electron Microscopy (SEM) after a sodium hypochlorite solution was applied for up to 10 min with no adverse effect, in contrast to 1 min of ortho-phthalaldeyde, which caused deterioration [50]. Hiraguchi et al evaluated stone model distortions using a hypochlorite solution of less than 15 µm [51], where no deformations or dimensional changes were present using spray disinfectant with 1% hypochlorite solution and 2% glutaraldehyde solution [52].…”

Section: Discussionmentioning

confidence: 99%

Alginate Materials and Dental Impression Technique: A Current State of the Art and Application to Dental Practice

et al. 2018

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Hydrocolloids were the first elastic materials to be used in the dental field. Elastic impression materials include reversible (agar-agar), irreversible (alginate) hydrocolloids and synthetic elastomers (polysulfides, polyethers, silicones). They reproduce an imprint faithfully, providing details of a high definition despite the presence of undercuts. With the removal of the impression, being particularly rich in water, the imprints can deform but later adapt to the original shape due to the elastic properties they possess. The advantages of using alginate include the low cost, a better tolerability on the part of the patient, the ease of manipulation, the short time needed for execution, the instrumentation and the very simple execution technique and possibility of detecting a detailed impression (even in the presence of undercuts) in a single step. A comprehensive review of the current literature was conducted according to the PRISMA guidelines by accessing the NCBI PubMed database. Authors conducted a search of articles in written in English published from 2008 to 2018. All the relevant studies were included in the search with respect to the characteristics and evolution of new marine derived materials. Much progress has been made in the search for new marine derived materials. Conventional impression materials are different, and especially with the advent of digital technology, they have been suffering from a decline in research attention over the last few years. However, this type of impression material, alginates (derived from marine algae), have the advantage of being among the most used in the dental medical field.

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Effects of immersion disinfection of agar-alginate combined impressions on the surface properties of stone casts

Cited by 15 publications

References 13 publications

Innovation by Computer-Aided Design/Computer-Aided Manufacturing Technology: A Look at Infection Prevention in Dental Settings

Innovation by Computer-Aided Design/Computer-Aided Manufacturing Technology: A Look at Infection Prevention in Dental Settings

Evaluation of Antimicrobial Effects on Dental Impression Materials and Biofilm Removal by Sodium Dichloroisocyanurate

Alginate Materials and Dental Impression Technique: A Current State of the Art and Application to Dental Practice

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