The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

INFLUENCE OF INDIVIDUAL TOOTH TRAY ON THE TEETH WITH UNDERCUT IN IMPRESSION TAKING

언더컷이 있는 치아에서 개별 치아 트레이가 인상채득에 미치는 영향

  • Seo Kowang-Won (Departument of Oral Rehabilitation, Graduate School of Clinical Dentistry Korea University) ;
  • Shin Sang-Wan (Departument of Oral Rehabilitation, Graduate School of Clinical Dentistry Korea University) ;
  • Lee Jeong-Yeol (Departument of Oral Rehabilitation, Graduate School of Clinical Dentistry Korea University)
  • 서광원 (고려대학교 임상치의학대학원 악구강기능회복학과) ;
  • 신상완 (고려대학교 임상치의학대학원 악구강기능회복학과) ;
  • 이정렬 (고려대학교 임상치의학대학원 악구강기능회복학과)
  • Published : 2004.02.01
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Abstract

Problem : The several studies were reported to the effects of individual tooth tray with the parallel tooth, but not reported to the effect of individual tooth tray with severe undercut in impression making. Purpose : The purpose of this study is to examine the effect of individual tooth tray; 1) the accuracy of impression in terms of distance. 2) reproducibility of pocket. Material and methods : In this study, a metal model with 3 teeth including tooth prepared 30-degree undercut and gingival crevice of the depth 5mm, width 0.4mm was cast. Impressions of the metal model were taken in 5 times used 4 kinds of impression materials with individual tooth tray and another impression taking were made with conventional method without individual tooth, used same materials, procedure. The stone models were made. Distances between abutments were measured with a Micromeasurescoup-mm. Result : The following results were obtained ; 1. In the comparisonof inter-abutment distance between parallel tooth without individual tooth tray, 4elastomeric materials have not significant difference to the metal model(p>0.05). 2. In the comparisonof inter-abutment distance with undercut tooth without individual tooth tray, 4elastomeric materials have a significant difference to the metal model(p<0.05), especially polyether's dimensional change is large. 3. If individual tooth tray was used to take impression in abutment teeth with severe undercut, more stable results was achieved easily than conventional method. (p>0.05). 4. It is not true that the pressure of impression material with individual tooth tray increased to gingival sulcus. Conclusion : By the results, I knew the fact that individual tooth tray was useful impression method on the teeth with severe undercut for the dimensional stability. Also, I could not confirm the fact that individual tooth tray would increase the penetrating pressure into cervice.

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References

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