Analysis of vertical marginal discrepancy in feldspathic porcelain crowns manufactured with different CAD/CAM systems: Closed and open

ABSTRACT

Objective: The objective of this study is to compare the marginal adaptation of feldspathic porcelain crowns using two computer-aided design/computer-aided manufacturing systems, one of them is open and the other is closed. Materials and Methods: Twenty identical titanium abutments were divided into two groups: open system (OS), where ceramic crowns were created using varied equipment and software, and closed system (CS), where ceramic crowns were created using the CEREC system. Through optical microscopy analysis, we assess the marginal adaptation of the prosthetic interfaces. The data were subjected to the distribution of normality and variance. The i-test was used for the analysis of the comparison factor between the groups, and the one-way ANOVA was used to compare the variance of crown analysis regions within the group. A significance level of 5% was considered for the analyses. Results: There was a significant difference between the systems (P = 0.007), with the CS group having the higher mean (23.75 pm ± 3.05) of marginal discrepancy when compared to the open group (17.94 pm ± 4.77). Furthermore, there were no differences in marginal discrepancy between the different points between the groups (P > 0.05). Conclusions: The studied groups presented results within the requirements set out in the literature. However, the OS used presented better results in marginal adaptation.

Key words:

Computer-aided design - dental prosthesis - implant supported - dental marginal adaptation - dental crown - implant rehabilitation

• REFERENCES

• 1 Schönberger J, Erdelt KJ, Bäumer 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
• 2 Lins L, Bemfica V, Queiroz C, Canabarro A. In vitro evaluation of the internal and marginal misfit of CAD/CAM zirconia copings. J Prosthet Dent 2015; 113: 205-11
• 3 Abduo J, Bennani V, Waddell N, Lyons K, Swain M. Assessing the fit of implant fixed prostheses: A critical review. Int J Oral Maxillofac Implants 2010; 25: 506-15
• 4 Real-Voltas F, Romano-Cardozo E, Figueras-Alvarez O, Brufau-de Barbera M, Cabratosa-Termes J. Comparison of the marginal fit of cobalt-chromium metal-ceramic crowns fabricated by CAD/CAM techniques and conventional methods at three production stages. Int J Prosthodont 2017; 30: 304-5
• 5 Neves FD, Prado CJ, Prudente MS, Carneiro TA, Zancopé K, Davi LR. et al. 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
• 6 Renne W, Wolf B, Kessler R, McPherson K, Mennito AS. Evaluation of the marginal fit of CAD/CAM crowns fabricated using two different chairside CAD/CAM systems on preparations of varying quality. J Esthet Restor Dent 2015; 27: 194-202
• 7 Ha SJ, Cho JH. Comparison of the fit accuracy of zirconia-based prostheses generated by two CAD/CAM systems. J Adv Prosthodont 2016; 8: 439-48
• 8 Guess PC, Zavanelli RA, Silva NR, Bonfante EA, Coelho PG, Thompson VP. et al. Monolithic CAD/CAM lithium disilicate versus veneered Y-TZP crowns: Comparison of failure modes and reliability after fatigue. Int J Prosthodont 2010; 23: 434-42
• 9 Beuer F, Edelhoff D, Gernet W, Naumann M. Effect of preparation angles on the precision of zirconia crown copings fabricated by CAD/CAM system. Dent Mater J 2008; 27: 814-20
• 10 Torabi K, Vojdani M, Giti R, Taghva M, Pardis S. The effect of various veneering techniques on the marginal fit of zirconia copings. J Adv Prosthodont 2015; 7: 233-9
• 11 McLean JW, von Fraunhofer JA. The estimation of cement film thickness by anin vivo technique. Br Dent J 1971; 131: 107-11
• 12 Boitelle P, Mawussi B, Tapie L, Fromentin O. A systematic review of CAD/CAM fit restoration evaluations. J Oral Rehabil 2014; 41: 853-74
• 13 Contrepois M, Soenen A, Bartala M, Laviole O. Marginal adaptation of ceramic crowns: A systematic review. J Prosthet Dent 2013; 110: 447-540000000000
• 14 Memarian M, Sadighpour L, Nosratpour R, Fard MJ. Marginal adaptation and internal fit of posterior 3-unit zirconia FPDs fabricated with different CAD/CAM systems. Eur J Prosthodont Restor Dent 2017; 25: 79-85
• 15 Alajaji NK, Bardwell D, Finkelman M, Ali A. Micro-CT evaluation of ceramic inlays: Comparison of the marginal and internal fit of five and three axis CAM systems with a heat press technique. J Esthet Restor Dent 2017; 29: 49-58
• 16 Shim JS, Lee JS, Lee JY, Choi YJ, Shin SW, Ryu JJ. et al. Effect of software version and parameter settings on the marginal and internal adaptation of crowns fabricated with the CAD/CAM system. J Appl Oral Sci 2015; 23: 515-22
• 17 Bramanti E, Cervino G, Lauritano F, Fiorillo L, D'Amico C, Sambataro S. et al. FEM and von mises analysis on prosthetic crowns structural elements: Evaluation of different applied materials. ScientificWorldJournal 2017; 2017: 1029574
• 18 Cicciù M, Cervino G, Bramanti E, Lauritano F, Lo Gudice G, Scappaticci L. et al. FEM analysis of mandibular prosthetic overdenture supported by dental implants: Evaluation of different retention methods. Comput Math Methods Med 2015; 2015: 943839
• 19 Al-Meraikhi H, Yilmaz B, McGlumphy E, Brantley W, Johnston WM. In vitro fit of CAD-CAM complete arch screw-retained titanium and zirconia implant prostheses fabricated on 4 implants. J Prosthet Dent 2017; pii: S0022-3913 (17) 30311-6