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치과용 경석고의 사용방법에 따른 경화팽창과 표면상태 비교연구

The comparison research of the setting expansion and surface condition by using method of dental stone

  • 박수철 (김천대학교 치기공학과) ;
  • 남상용 (대구보건대학교 치기공과) ;
  • 정인호 (김천대학교 치기공학과)
  • Park, Soo-chul (Dept. of Dental Technology, Gimcheon University) ;
  • Nam, Sang-young (Dept. of Dental Laboratory Technology, Daegu Heath College) ;
  • Jung, In-ho (Dept. of Dental Technology, Gimcheon University)
  • 투고 : 2016.10.01
  • 심사 : 2016.12.23
  • 발행 : 2016.12.30

초록

Purpose: The purpose of this study is to measure and compare a degree of setting expansion of dental stone by time depending on the mixing methods and mixing ratios of dental stone, to compare the surface state of each specimen with the use of an optical camera with microscope, and thereby to provide a fundamental material for making dental prostheses. Methods: The test on setting expansion of dental stone is based on ISO 6873. With two different mixing ratios and three kinds of stone mixing methods, test groups were created, and a total of six types of specimens (N=30) were made. Based on the specimens, the setting expansion rate of each one was measured in each time slot of 24 hours, and the surface of the set stone was measured. Results: According to the analysis on setting expansion rate of stone, the setting expansion of the specimen that was created in the way of vacuum mixing at normal mixing ratio was 0.1944% at 120 minutes; the setting expansion of the specimen that was created in the way of vacuum mixing at the mixing ratio which was 40% higher than normal mixing ratio was 0.195% at 120 minutes; the setting expansion of the specimen that was created in the way of mixing with hands at normal mixing ratio and then removing bubbles in vacuum mixer was 0.196% at 120 minutes. Conclusion: The setting expansion rate of each dental stone specimen was significantly different with the lapse of time up to 24 hours(p<.001).

키워드

참고문헌

  1. Garber DK, Powers JM, Brandau HE. Effect of spatulation on the properties of highstrength dental stones. J Mich Dent Assoc, 67(3), 133-136, 1985.
  2. ISO 6873. Dentistry - Gypsum products. 1-19, 2013.
  3. Joo YH, Lee JH. Three dimensional accuracy analysis of dental stone casts fabricated using irreversible hydrocolloid impressions. J Dent Rehabil Appl Sci, 31(4), 316-328, 2015. https://doi.org/10.14368/jdras.2015.31.4.316
  4. Kim KB, Lee GT, Kim HY, Kim JH. The Influence of Different Gypsum Materials on the Accuracy from Complete Arch Digital Impression. Journal of Dental Hygiene Science, 12(6), 617-623, 2012.
  5. Kim YU, Kang JK, Lee YK, Kim KM, and Kim KN. Mechanical Properties of Dental Gypsums according to ISO 6873. Korean J Dent Mater, 29(1), 47-54, 2002.
  6. Kim WT, Kim SH, Kim EN, Nam SY, Ryu JK, Sung HK, Chen JN, Jung IH, Cha SS, Han MS. Dental Technology materials. 4th ed, Komoonsa, 69-84, 2010.
  7. Powers, JM, Sakaguchi, RL, Craig, RG. Craig's restorative dental materials. 12th ed, JeeSeung, 339-361, 2008.
  8. Schwedhelm ER, Lepe X. Fracture strength of type IV and type V die stone as a function of time. J Prosthet Dent, 78(6), 554-559, 1977. https://doi.org/10.1016/S0022-3913(97)70005-2
  9. Song YH, Lee HH, Dong JK. Effects of mixing waters on setting time and compressive strength of high-strength stone. J Korea Res Soc Dent Mater, 29(4), 369-374, 2002.
  10. Yi HJ, Lim JH, Lee JS. A comparative study on the accuracy of impression body according to the types of impression tray. The Journal of Korean Academy of Prosthodontics, 48(1), 48-54, 2010. https://doi.org/10.4047/jkap.2010.48.1.48