The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Effect of different tooth preparation designs on the marginal and internal fit discrepancies of cobalt-chromium crowns produced by computer-aided designing and selective laser melting processes

  • Yu, Na (College of Stomatology, Chongqing Medical University) ;
  • Dai, Hong-Wei (College of Stomatology, Chongqing Medical University) ;
  • Tan, Fa-Bing (College of Stomatology, Chongqing Medical University) ;
  • Song, Jin-Lin (College of Stomatology, Chongqing Medical University) ;
  • Ma, Chao-Yi (College of Stomatology, Chongqing Medical University) ;
  • Tong, Xue-Lu (College of Stomatology, Chongqing Medical University)
  • Received : 2021.07.01
  • Accepted : 2021.10.18
  • Published : 2021.10.30
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Abstract

PURPOSE. To evaluate the impact of five different tooth preparation designs on the marginal and internal fit discrepancies of cobalt-chromium (CoCr) crowns produced by computer-aided designing (CAD) and selective laser melting (SLM) processes. MATERIALS AND METHODS. Five preparation data were constructed, after which design crowns were obtained. Actual crowns were fabricated using an SLM process. After the data of actual crowns were obtained with structural light scanning, intaglio surfaces of the design crown and actual crown were virtually superimposed on the preparation. The fit-discrepancies were displayed with colors, while the root means square was calculated and analyzed with one-way analysis of variance (ANOVA), Tukey's test or Kruskal-Wallis test (α = .05). RESULTS. The marginal or internal color-coded images in the five design groups were not identical. The shoulder-lip and sharp line angle groups in the CAD or SLM process had larger marginal or internal fit discrepancies compared to other groups (P < .05). In the CAD process, the mean marginal and internal fit discrepancies were 10.0 to 24.2 ㎛ and 29.6 to 31.4 ㎛, respectively. After the CAD and SLM processes, the mean marginal and internal fit discrepancies were 18.4 to 40.9 ㎛ and 39.1 to 47.1 ㎛, respectively. The SLM process itself resulted in a positive increase of the marginal (6.0 - 16.7 ㎛) and internal (9.0 - 15.7 ㎛) fit discrepancies. CONCLUSION. The CAD and SLM processes affected the fit of CoCr crowns and varied based on the preparation designs. Typically, the shoulder-lip and sharp line angle designs had a more significant effect on crown fit. However, the differences between the design groups were relatively small, especially when compared to fit discrepancies observed clinically.

Keywords

Acknowledgement

This work was supported by the National Key Research and Development of China (No. 2016YFC1100500); Scientific and Technology Research Program of Chongqing Municipal Education Commission (NO.KJQN202100439); Research Project of Chongqing Science and Technology Bureau (No.cstc2020jscx-sbqwX0006).

References

  1. Tamac E, Toksavul S, Toman M. Clinical marginal and internal adaptation of CAD/CAM milling, laser sintering, and cast metal ceramic crowns. J Prosthet Dent 2014;112:909-13. https://doi.org/10.1016/j.prosdent.2013.12.020
  2. Zeng L, Zhang Y, Liu Z, Wei B. Effects of repeated firing on the marginal accuracy of Co-Cr copings fabricated by selective laser melting. J Prosthet Dent 2015;113:135-9. https://doi.org/10.1016/j.prosdent.2014.09.004
  3. Hong MH, Min BK, Lee DH, Kwon TY. Marginal fit of metal-ceramic crowns fabricated by using a casting and two selective laser melting processes before and after ceramic firing. J Prosthet Dent 2019;122:475-81. https://doi.org/10.1016/j.prosdent.2019.03.002
  4. Kocaagaoglu H, Kilinc Hi, Albayrak H, Kara M. In vitro evaluation of marginal, axial, and occlusal discrepancies in metal ceramic restorations produced with new technologies. J Prosthet Dent 2016;116:368-74. https://doi.org/10.1016/j.prosdent.2016.03.013
  5. Koutsoukis T, Zinelis S, Eliades G, Al-Wazzan K, Rifaiy MA, Al Jabbari YS. Selective laser melting technique of co-cr dental alloys: a review of structure and properties and comparative analysis with other available techniques. J Prosthodont 2015;24:303-12. https://doi.org/10.1111/jopr.12268
  6. Yang X, Xiang N, Wei B. Effect of fluoride content on ion release from cast and selective laser melting-processed Co-Cr-Mo alloys. J Prosthet Dent 2014;112:1212-6. https://doi.org/10.1016/j.prosdent.2013.12.022
  7. Zeng L, Xiang N, Wei B. A comparison of corrosion resistance of cobalt-chromium-molybdenum metal ceramic alloy fabricated with selective laser melting and traditional processing. J Prosthet Dent 2014;112:1217-24. https://doi.org/10.1016/j.prosdent.2014.03.018
  8. Kokubo Y, Ohkubo C, Tsumita M, Miyashita A, Vult von Steyern P, Fukushima S. Clinical marginal and internal gaps of Procera AllCeram crowns. J Oral Rehabil 2005;32:526-30. https://doi.org/10.1111/j.1365-2842.2005.01458.x
  9. Sakrana AA. In vitro evaluation of the marginal and internal discrepancies of different esthetic restorations. J Appl Oral Sci 2013;21:575-80. https://doi.org/10.1590/1679-775720130064
  10. Zimmermann M, Valcanaia A, Neiva G, Mehl A, Fasbinder D. Three-dimensional digital evaluation of the fit of endocrowns fabricated from different CAD/CAM materials. J Prosthodont 2019;28:e504-9. https://doi.org/10.1111/jopr.12770
  11. van Noort R. The future of dental devices is digital. Dent Mater 2012;28:3-12. https://doi.org/10.1016/j.dental.2011.10.014
  12. Raigrodski AJ. Contemporary materials and technologies for all-ceramic fixed partial dentures: a review of the literature. J Prosthet Dent 2004;92:557-62. https://doi.org/10.1016/j.prosdent.2004.09.015
  13. Schaefer O, Kuepper H, Thompson GA, Cachovan G, Hefti AF, Guentsch A. Effect of CNC-milling on the marginal and internal fit of dental ceramics: a pilot study. Dent Mater 2013;29:851-8. https://doi.org/10.1016/j.dental.2013.04.018
  14. Nesse H, Ulstein DM, Vaage MM, Oilo M. Internal and marginal fit of cobalt-chromium fixed dental prostheses fabricated with 3 different techniques. J Prosthet Dent 2015;114:686-92. https://doi.org/10.1016/j.prosdent.2015.05.007
  15. Akcin ET, Guncu MB, Aktas G, Aslan Y. Effect of manufacturing techniques on the marginal and internal fit of cobalt-chromium implant-supported multiunit frameworks. J Prosthet Dent 2018;120:715-20. https://doi.org/10.1016/j.prosdent.2018.02.012
  16. Freifrau von Maltzahn N, Bernhard F, Kohorst P. Fitting accuracy of ceramic veneered Co-Cr crowns produced by different manufacturing processes. J Adv Prosthodont 2020;12:100-6. https://doi.org/10.4047/jap.2020.12.2.100
  17. Kim DY. Evaluation of fits of metal copings fabricated by using selective laser melting at various angles. J Prosthet Dent 2021:S0022-3913(20)30608-9.
  18. Seymour KG, Samarawickrama DY, Lynch EJ. Metal ceramic crowns-a review of tooth preparation. Eur J Prosthodont Restor Dent 1999;7:79-84.
  19. Shiratsuchi H, Komine F, Kakehashi Y, Matsumura H. Influence of finish line design on marginal adaptation of electroformed metal-ceramic crowns. J Prosthet Dent 2006;95:237-42. https://doi.org/10.1016/j.prosdent.2006.01.009
  20. Renne W, McGill ST, Forshee KV, DeFee MR, Mennito AS. Predicting marginal fit of CAD/CAM crowns based on the presence or absence of common preparation errors. J Prosthet Dent 2012;108:310-5. https://doi.org/10.1016/S0022-3913(12)60183-8
  21. Al Maaz A, Thompson GA, Drago C, An H, Berzins D. Effect of finish line design and metal alloy on the marginal and internal gaps of selective laser melting printed copings. J Prosthet Dent 2019;122:143-51. https://doi.org/10.1016/j.prosdent.2019.02.009
  22. Podhorsky A, Rehmann P, Wostmann B. Tooth preparation for full-coverage restorations - a literature review. Clin Oral Investig 2015;19:959-68. https://doi.org/10.1007/s00784-015-1439-y
  23. Yu H, Chen YH, Cheng H, Sawase T. Finish-line designs for ceramic crowns: a systematic review and meta-analysis. J Prosthet Dent 2019;122:22-30.e5. https://doi.org/10.1016/j.prosdent.2018.10.002
  24. Tan FB, Song JL, Wang C, Fan YB, Dai HW. Titanium clasp fabricated by selective laser melting, CNC milling, and conventional casting: a comparative in vitro study. J Prosthodont Res 2019;63:58-65. https://doi.org/10.1016/j.jpor.2018.08.002
  25. Huang Z, Zhang L, Zhu J, Zhang X. Clinical marginal and internal fit of metal ceramic crowns fabricated with a selective laser melting technology. J Prosthet Dent 2015;113:623-7. https://doi.org/10.1016/j.prosdent.2014.10.012
  26. Schonberger J, Erdelt KJ, Baumer D, Beuer F. Marginal and internal fit of posterior three-unit fixed zirconia dental prostheses fabricated with two different CAD/CAM systems and materials. Clin Oral Investig 2017;21:2629-35. https://doi.org/10.1007/s00784-017-2064-8
  27. Ortega R, Gonzalo E, Gomez-Polo M, Lopez-Suarez C, Suarez MJ. SEM evaluation of the precision of fit of CAD/CAM zirconia and metal-ceramic posterior crowns. Dent Mater J 2017;36:387-93. https://doi.org/10.4012/dmj.2016-305
  28. Neves FD, Prado CJ, Prudente MS, Carneiro TA, Zancope K, Davi LR, Mendonca G, Cooper LF, Soares CJ. Micro-computed tomography evaluation of marginal fit of lithium disilicate crowns fabricated by using chairside CAD/CAM systems or the heat-pressing technique. J Prosthet Dent 2014;112:1134-40. https://doi.org/10.1016/j.prosdent.2014.04.028
  29. Gurel K, Toksavul S, Toman M, Tamac E. In vitro marginal and internal adaptation of metal-ceramic crowns with cobalt-chrome and titanium framework fabricated with CAD/CAM and casting technique. Niger J Clin Pract 2019;22:812-6. https://doi.org/10.4103/njcp.njcp_570_18
  30. Kim JH, Kim KB, Kim WC, Rhee HS, Lee IH, Kim JH. Influence of various gypsum materials on precision of fit of CAD/CAM-fabricated zirconia copings. Dent Mater J 2015;34:19-24. https://doi.org/10.4012/dmj.2014-141
  31. Zheng SX, Li J, Sun QF. Extraction of the borderline in Prepared tooth cavity based on intelligent scissors. The 2nd iCBBE, Shanghai, China, 2008. p. 680-3.
  32. Zhang B, Dai N, Tian S, Yuan F, Yu Q. The extraction method of tooth preparation margin line based on S-Octree CNN. Int J Numer Method Biomed Eng 2019;35:e3241.
  33. Song Y, Zhao YJ, Sun YC, Lu PJ, Wang Y. [Initial evolution research for design and process accuracy of one type of domestic computer aided design soft and computer aided manufacture]. Zhonghua Kou Qiang Yi Xue Za Zhi 2013;48:550-3.
  34. Morgan D, Agba E, Hill C. Support structure development and initial results for metal powder bed fusion additive manufacturing. Procedia Manuf 2017;10:819-30. https://doi.org/10.1016/j.promfg.2017.07.083
  35. Adam GAO, Zimmer D. Design for additive manufacturing-element transitions and aggregated structures. CIRP J Manuf Sci Technol 2014;7:20-8. https://doi.org/10.1016/j.cirpj.2013.10.001
  36. Yang X, Yang Y, Liu Y, Wang D. Study on dimensional accuracy of typical geometric features manufactured by selective laser melting. Zhongguo Jiguang/Chinese J Lasers 2015;42.
  37. Soares CJ, Martins LR, Fonseca RB, Correr-Sobrinho L, Fernandes Neto AJ. Influence of cavity preparation design on fracture resistance of posterior Leucite-reinforced ceramic restorations. J Prosthet Dent 2006;95:421-9. https://doi.org/10.1016/j.prosdent.2006.03.022
  38. Beuer F, Naumann M, Gernet W, Sorensen JA. Precision of fit: zirconia three-unit fixed dental prostheses. Clin Oral Investig 2009;13:343-9. https://doi.org/10.1007/s00784-008-0224-6
  39. Papadiochou S, Pissiotis AL. Marginal adaptation and CAD-CAM technology: a systematic review of restorative material and fabrication techniques. J Prosthet Dent 2018;119:545-51. https://doi.org/10.1016/j.prosdent.2017.07.001
  40. Mou SH, Chai T, Wang JS, Shiau YY. Influence of different convergence angles and tooth preparation heights on the internal adaptation of Cerec crowns. J Prosthet Dent 2002;87:248-55. https://doi.org/10.1067/mpr.2002.122011