Analysis of internal fitness of single crown fabricated by additive method

첨가법에 의해 제작된 단관의 내면 적합도 분석

  • Received : 2015.10.27
  • Accepted : 2015.12.11
  • Published : 2015.12.30


Purpose: The purpose of this study was to analysis the internal fitness of single crown fabricated by additive method technique. Methods: Study models were fabricated. Ten crowns were manufactured by additive method technique (AM group) and another ten crowns using conventional method were manufactured (CM group). The internal fitness of specimens were measured using silicone replica technique. Silicone replicas were sectioned one times (direction: from mesial to distal). The internal fitness were evaluated using by digital microscope. Statistical analyses were performed with independent samples t-test. (${\alpha}=0.05$). Results: Mean(SD) of all internal fitness were $92.1(20.0){\mu}m$ for AM group and $69.7(12.3){\mu}m$ for CM group. Two groups were statistically significant differences (p<0.001). Conclusion: All internal gaps of AM group were ranged within the clinical recommendation ($120{\ss}{\neq}$).


Additive manufacturing;Fitness;Internal fit;Single crown


  1. Bidra AS, Taylor TD, Agar JR. Computer-aided technology for fabricating complete dentures: systematic review of historical background, current status, and future perspectives. J Prosthet Dent, 109, 361-366, 2013.
  2. Bindl A, Mormann WH. Marginal and internal fit of all-ceramic CAD/CAM crown-copings on chamfer preparations. J Oral Rehabil, 32, 441-447, 2005.
  3. Foster LV. Failed conventional bridge work from general dental practice: clinical aspects and treatment needs of 142 cases. Brit Dent J 168, 199-201, 1990.
  4. Kim KB, Kim SJ, Kim JH, Kim JH. An evaluation of validity of three dimensional digital model fabricated by dental scannable stone. J Kor Aca Dent Tec, 35, 29-35, 2013.
  5. Kim WS, Han MS, Jung JK, Kim KB. Analysis of quality for fixed prostheses fabricated by dental CAD/CAM system. J Kor Aca Dent Tec, 36, 159-164, 2014
  6. Laurent M, Scheer P, Dejou J, Laborde G. Clinical evaluation of the marginal fit of cast crownsvalidation of the silicone replica method. J Oral Rehabil, 35, 116-122, 2008.
  7. McLean JW, von Frauenhofer JA. The estimation of cement film thickness by an in vivo technique. Br Dent J, 131, 107-111, 1971.
  8. Miyazaki T, Hotta Y, Kunii J, Kuriyama S, Tamaki Y. A review of dental CAD/CAM: current status and future perspectives from 20 years of experience. Dent Mater J, 28, 44-56, 2009.
  9. Rekow ED. High-technology innovations and limitations for restorative dentistry. Dent Clin North Am, 37, 513-524, 1993.
  10. Strub JR, Rekow ED, Witkowski S. Computeraided design and fabrication of dental restorations: current systems and future possibilities. J Am Dent Assoc, 137, 1289-1296, 2006.
  11. Van Noort R. The future of dental devices is digital. Dent Mater, 28, 3-12, 2012.
  12. White SN, Sorensen JA, Kang SK, Caputo AA. Microleakage of a new crown and fixed partial denture luting agent. J Prosthet Dent, 67, 156-161, 1992.
  13. Witkowski S. CAD/CAM in dental technology. Quintessence Dent Technol, 28, 169-184, 2005.
  14. Kokubo Y, Tsumita M, Kano T, Sakurai S, Fukushima S. Clinical marginal and internal gaps of zirconia all-ceramic crowns. J Prosthodont Res, 55, 40-43, 2011.