The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

RETENTIVE FORCE OF ADJUSTABLE DENTAL IMPRESSION TRAYS WITH DIFFERENT RETENTION FORMS

유지형태에 따른 가변형 치과 인상용 트레이의 유지력에 관한 연구

  • Song Kie-Bum (Dept. of Prosthodontics, School of Dentistry, Wonkwang University) ;
  • Kim Sung-Rok (Dept. of Prosthodontics, School of Dentistry, Wonkwang University) ;
  • Park Kwang-Soo (Dept. of Prosthodontics, School of Dentistry, Wonkwang University) ;
  • Kim Yu-Lee (Dept. of Prosthodontics, School of Dentistry, Wonkwang University) ;
  • Dong Jin-Keun (Dept. of Prosthodontics, School of Dentistry, Wonkwang University)
  • 송기범 (원광대학교 치과대학 치과보철학교실) ;
  • 김성록 (원광대학교 치과대학 치과보철학교실) ;
  • 박광수 (원광대학교 치과대학 치과보철학교실) ;
  • 김유리 (원광대학교 치과대학 치과보철학교실) ;
  • 동진근 (원광대학교 치과대학 치과보철학교실)
  • Published : 2005.02.01
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Abstract

Statement of problem. The adjustable dental impression trays were made for being adjusted their width automatically along the width of dental arch. Purpose. The purpose of this study was to investigate the best retentive form of adjustable dental impression tray, and so to make it a more satisfactory product. Material and methods. The eight pairs of adjustable trays were made of ABS(acrylonitrile butadiene styrene) with different distribution of holes and with or without the rim on the border area of them. The experiment was done with the horse-shoe shaped metal plate to pull out the set impression body from the tray, and the tray jig which was made for holding the tray on a lower part of Universal Testing Machine(UTM, Zwick Z020, Zwick Co., Germany). After the impression in the tray was allowed to set four minutes, a tensile force was applied at right angles to the tray which had been previously seated on the jig. The force was applied to measure a maximum retentive force by use of a UTM at a constant strain rate of 100mm per minute. A 2-factor analysis of variance (p<.05) was used to determine whether differences existed among distribution of retentive holes and between rim existing and not. Results. 1 The retentive force of the upper and lower resin tray with 2mm holes on the tray border was highest(25.83/24.98kg). (p<.05) 2. As the tray had more retentive holes, it was less retentive. 3. There was no significant difference in the retentive force of the varied hole intervals in the case of distributing all the area. (p>.05) 4. The rimless trays were more retentive generally, than the rimmed trays except 2 case: upper tray group-all area / 2 mm, intervals and lower tray group-margin only / 2 mm, intervals.(p<.05) 5. Most of the adjustable trays were showed higher retentive force than perforated metal tray except the lower group that perforated on the all area at intervals of 2 mm.

Keywords

References

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