An analysis of the persistent presence of opportunistic pathogens on patient-derived dental impressions and gypsum casts

Hiroshi Egusa, Takao Watamoto, Keiko Abe, Munemasa Kobayashi, Yoshitoshi Kaneda, Shunji Ashida, Takuya Matsumoto, Hirofumi Yatani

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Purpose: This study aimed to assess the persistent presence of microorganisms on patient-derived dental impressions and gypsum casts, while highlighting important human pathogens such as Candida, methicillin-resistant Staphylococcus aureus (MRSA), and Pseudomonas aeruginosa. Materials and Methods: The practices and opinions regarding cross-infection control from 59 general dentists in Japan were obtained via a questionnaire. Alginate impressions were made from 56 patients. Using a brain heart infusion agar medium, impression and imprint cultures were carried out to visualize the microbial contamination on the surfaces of the impressions and gypsum casts, respectively. The colonies on the surfaces of the 30 impression cultures and 26 imprint cultures were collected by swabbing and then inoculated onto selective agar plates to detect streptococci, staphylococci, Candida, MRSA, and P aeruginosa. Results: The questionnaire showed that only 54% of general dentists had a cross-infection policy in their dental clinics, and only 30% to 40% were aware of the possible persistence of MRSA or P aeruginosa on impressions and gypsum casts. The impression/imprint cultures grew a large number of visible bacterial colonies on all of the impression/gypsum cast samples investigated. Selective agar cultures demonstrated the presence of streptococci (100, 100%), staphylococci (56.7, 65.4%), Candida (30, 46.2%), MRSA (26.7, 15.4%), and P aeruginosa (6.7, 7.7%) on the impressions and the gypsum casts, respectively. Conclusions: This Investigation showed that patient-derived dental impressions and gypsum casts are contaminated with numerous microbes, Including Candida, MRSA, and P aeruginosa, which are known pathogens responsible for nosocomial and/or life-threatening infection in the immunocompromised host.

Original languageEnglish
Pages (from-to)62-68
Number of pages7
JournalThe International journal of prosthodontics
Volume21
Issue number1
Publication statusPublished - Jan 2008
Externally publishedYes

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Calcium Sulfate
Methicillin-Resistant Staphylococcus aureus
Candida
Agar
Cross Infection
Streptococcus
Dentists
Staphylococcus
Dental Clinics
Immunocompromised Host
Infection Control
Pseudomonas aeruginosa
Japan
Brain
Infection

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Egusa, H., Watamoto, T., Abe, K., Kobayashi, M., Kaneda, Y., Ashida, S., ... Yatani, H. (2008). An analysis of the persistent presence of opportunistic pathogens on patient-derived dental impressions and gypsum casts. The International journal of prosthodontics, 21(1), 62-68.

An analysis of the persistent presence of opportunistic pathogens on patient-derived dental impressions and gypsum casts. / Egusa, Hiroshi; Watamoto, Takao; Abe, Keiko; Kobayashi, Munemasa; Kaneda, Yoshitoshi; Ashida, Shunji; Matsumoto, Takuya; Yatani, Hirofumi.

In: The International journal of prosthodontics, Vol. 21, No. 1, 01.2008, p. 62-68.

Research output: Contribution to journalArticle

Egusa, Hiroshi ; Watamoto, Takao ; Abe, Keiko ; Kobayashi, Munemasa ; Kaneda, Yoshitoshi ; Ashida, Shunji ; Matsumoto, Takuya ; Yatani, Hirofumi. / An analysis of the persistent presence of opportunistic pathogens on patient-derived dental impressions and gypsum casts. In: The International journal of prosthodontics. 2008 ; Vol. 21, No. 1. pp. 62-68.
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AU - Ashida, Shunji

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