The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Identification of mutans streptococci isolated from dental plaque between the bracket and tooth surface in orthodontic patients

교정환자의 브라켓과 치아 경계부에 존재하는 치면세균막내 mutans streptococci 종 및 생물형의 식별

  • Kim, Mi-Ae (Department of Orthodontics, College of Dentistry, Chosun University) ;
  • Yoo, So-Young (Department of Oral Biochemistry, College of Dentistry, Chosun University) ;
  • Kim, Hwa-Sook (Department of Oral Biochemistry, College of Dentistry, Chosun University) ;
  • Kook, Joong-Ki (Department of Oral Biochemistry, College of Dentistry, Chosun University) ;
  • Lim, Sung-Hoon (Department of Orthodontics, College of Dentistry, Chosun University) ;
  • Yoon, Young-Jooh (Department of Orthodontics, College of Dentistry, Chosun University) ;
  • Kim, Kwang-Won (Department of Orthodontics, College of Dentistry, Chosun University)
  • 김미애 (조선대학교 치과대학 교정학교실) ;
  • 유소영 (조선대학교 치과대학 구강생화학교실) ;
  • 김화숙 (조선대학교 치과대학 구강생화학교실) ;
  • 국중기 (조선대학교 치과대학 구강생화학교실) ;
  • 임성훈 (조선대학교 치과대학 교정학교실) ;
  • 윤영주 (조선대학교 치과대학 교정학교실) ;
  • 김광원 (조선대학교 치과대학 교정학교실)
  • Published : 2005.02.01
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Abstract

The aim of this study was to compare the species and biotypes of mutans streptococci isolated from dental plaques sampled from the interfaces between the bracket aid tooth surface and smooth tooth surfaces In orthodontic patients. Dental plaque was collected from the interfaces between brackets aid teeth (test group), and from smooth tooth surfaces distant from brackets by more that 2mm (control group). The dental plaque collected by a sterilized curette was transferred into a vial of 1 X PBS. The sample in the vial was vigorously vortexed for 1 min and plated ou mitis-salivarius bacitracin (MSB) agar plate using cotton tips. The agar plates were incubated at $37^[\circ}C$ in a candle jar for 2 days, and again incubated for 1 more day at anambient temperature Individual colonies were cultured in TH broth at $37^[\circ}C\;CO_2$ incubator. The PCR-RFLP based on dextranase gene was performed for the identification of mutans streptococci at the species-level For biotyping of mutans streptococci, biochemical tests were performed There was no significant difference of the species of mutans streptococci isolated from both test and control groups However, the biotypes of the mutans streptococci isolated from test and control groups were different. These results may offer the basic data to verify the relationship between the mutans streptococci biotype and enamel decalcification or dental caries in orthodontic patients with fixed appliances.

본 연구는 교정환자의 브라켓과 치아 경계부 및 브라켓으로부터 2mm 이상 떨어진 치아 평활면의 치면세균막에 존재하는 mutans streptococci의 종 및 생물형에 차이가 있는지를 알아보고자 시행되었다. 조선대학교 치과병원에 내원한 13세 이상 35세 미만의 환자 28명으로부터 브라켓을 장착하고 있는 61개 치아에서 치균세균막을 채취하여 mutans streptococci를 MSB 배지에서 선택적으로 분리한 다음, 이들의 지놈 DNA를 추출하여 dextranase 유전자를 표적으로 하는 중합효소연쇄반응법을 시행하고, 그 증폭물을 Hae III로 소화하고, 이를 전기영동하여 제한 효소절편길이에 따라 그 종을 식별하였다. 또한 생물형을 조사하기 위하여 생화학적 검사를 실시하였다. 그 결과 브라켓과 치아 경계부 및 브라켓으로부터 2mm 이상 떨어진 평활면의 치면세균막에 존재하는 mutans streptococci 종은 서로 비슷한 검출 빈도를 보이나, 두 곳에 존재하는 mutans streptococci 생물형은 서로 차이가 있는 것으로 나타났다 향후 브라켓과 치아 경계부 및 치아 평활면의 치면세균막의 mutans Streptococci 생물형의 차이와 브라켓 주위의 법랑질 탈회 및 치아우식증 발병과의 상관관계에 대한 연구가 필요하다.

Keywords

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