The effect of monolithic zirconia crown dimension on the accuracy of fit
Article Sidebar
Main Article Content
Abstract
Objective: To investigate the influence of monolithic zirconia crown dimension on the accuracy of marginal and internal fit
Materials and Methods: Four titanium models with various dimensional preparations were constructed. The general designed characteristics were circumferential deep chamfer finish line, round internal line angle, 12°of total occlusal convergence and 10 mm diameter at the margin.For group 1 and 2, the abutment was designed in order to get 1-mm and 2-mm uniform crown thickness, respectively. For group 3, the abutment was designed to get 1-mm thickness at axial wall and 2-mm thickness at occlusal wall, and, conversely,for group 4, the abutment was designed to get 2-mm thickness at axial wall and 1-mm thickness at occlusal wall. Forty identical external contour crowns were fabricated with Ceramill system (n= 10). Replica technique was used to examine marginal gap, absolute marginal discrepancy and additional 3 locations of internal gap: mid-axial wall, axio-occlusal angle and mid-occlusal area. The data were analyzed using One-way ANOVA and Turkey’s test at a significance level of 0.05.
Results: There were significant differences of gaps at most locations, except axial area (p<.05). The mean ± SD of marginal gaps were 27.9±5.4µm, 32.8±6.8µm, 32.6±7µmand 22.3±4.2 µmfor group 1, 2, 3 and 4, respectively. The mean ± SD of absolute marginal discrepancies were 131.5±11.7µm, 111±15.6µm, 114.5±15.8µmand 125.9±9.7 µmfor group 1, 2, 3 and 4, respectively. The highest internal gap was found at occlusal area in all groups.
Conclusion: The thickness of translucent zirconia crown influenced the marginal and internal fit. The marginal gap in all groups was obviously, clinically acceptable. The 1-mm uniform crown showed the largest absolute marginal discrepancy. When the thickness of crown at occlusal wall was thinner than its axial wall, the occlusal gap seemed to be greater. Therefore, appropriate crown thickness should be fabricated to avoid unpredictable stress that affected crown fitness.
Article Details
References
Manicone PF, Rossi Iommetti P, Raffaelli L. An overview of zirconia ceramics: basic properties and clinical applications. J Dent 2007; 35: 819-26.
Denry I, Kelly JR. State of the art of zirconia for dental applications. Dent Mater 2008; 24: 299-307.
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 2009; 28: 44-56.
Jung RE, Sailer I, Hammerle CH, Attin T, Schmidlin P. In vitro color changes of soft tissues caused by restorative materials. Int J Periodontics Restorative Dent 2007; 27: 251-7.
Heintze SD, Rousson V. Survival of zirconia- and metal-supported fixed dental prostheses: a systematic review. Int J Prosthodont 2010; 23: 493-502.
Ghodsi S, Jafarian Z. A Review on Translucent Zirconia. Eur J Prosthodont Restor Dent 2018; 26: 62-74.
Heffernan MJ, Aquilino SA, Diaz-Arnold AM, Haselton DR, Stanford CM, Vargas MA. Relative translucency of six all-ceramic systems. Part I: core materials. J Prosthet Dent 2002; 88: 4-9.
Apetz R, van Bruggen MPB. Transparent Alumina: A Light-Scattering Model. J. Am. Ceram. Soc 2003; 86: 480-6.
Bravo-Leon A, Morikawa Y, Kawahara M, Mayo MJ. Fracture toughness of nanocrystalline tetragonal zirconia with low yttria content. Acta Materialia 2002; 50: 4555-62.
Gupta TK, Lange FF, Bechtold JH. Effect of stress-induced phase transformation on the properties of polycrystalline zirconia containing metastable tetragonal phase. J of Mater Sci 1978; 13: 1464-70.
Kwon SJ, Lawson NC, McLaren EE, Nejat AH, Burgess JO. Comparison of the mechanical properties of translucent zirconia and lithium disilicate. J Prosthet Dent 2018; 120: 132-7.
Lang NP, Kiel RA, Anderhalden K. Clinical and microbiological effects of subgingival restorations with overhanging or clinically perfect margins. J Clin Periodontol 1983; 10: 563-78.
Felton DA, Kanoy BE, Bayne SC, Wirthman GP. Effect of in vivo crown margin discrepancies on periodontal health. J Prosthet Dent 1991; 65: 357-64.
Totiam P, Gonzalez-Cabezas C, Fontana MR, Zero DT. A new in vitro model to study the relationship of gap size and secondary caries. Caries Res 2007; 41: 467-73.
Borba M, Cesar PF, Griggs JA, Della Bona Á. Adaptation of all-ceramic fixed partial dentures. Dent Mater 2011; 27: 1119-26.
Kunii J, Hotta Y, Tamaki Y, Ozawa A, Kobayashi Y, Fujishima A, et al. Effect of sintering on the marginal and internal fit of CAD/CAM-fabricated zirconia frameworks. Dent Mater J 2007; 26: 820-6.
Ji MK, Park JH, Park SW, Yun KD, Oh GJ, Lim HP. Evaluation of marginal fit of 2 CAD-CAM anatomic contour zirconia crown systems and lithium disilicate glass-ceramic crown. J Adv Prosthodont 2015; 7: 271-7.
Anunmana C, Charoenchitt M, Asvanund C. Gap comparison between single crown and three-unit bridge zirconia substructures. J Adv Prosthodont 2014; 6: 253-8.
Habib SR, Asiri W, Hefne MJ. Effect of anatomic, semi-anatomic and non-anatomic occlusal surface tooth preparations on the adaptation of zirconia copings. J Adv Prosthodont 2014; 6: 444-50.
Edwards Rezende CE, Sanches Borges AF, Macedo RM, Rubo JH, Griggs JA. Dimensional changes from the sintering process and fit of Y-TZP copings: Micro-CT analysis. Dent Mater 2017; 33: e405-e13.
Oh GJ, Yun KD, Lee KM, Lim HP, Park SW. Sintering behavior and mechanical properties of zirconia compacts fabricated by uniaxial press forming. J Adv Prosthodont 2010; 2: 81-7.
Schriwer C, Skjold A, Gjerdet NR, Oilo M. Monolithic zirconia dental crowns. Internal fit, margin quality, fracture mode and load at fracture. Dent Mater 2017; 33: 1012-20.
Holmes JR, Bayne SC, Holland GA, Sulik WD. Considerations in measurement of marginal fit. J Prosthet Dent 1989; 62: 405-8.
Belser UC, MacEntee MI, Richter WA. Fit of three porcelain-fused-to-metal marginal designs in vivo: a scanning electron microscope study. J Prosthet Dent 1985; 53: 24-9.
McLean JW, von Fraunhofer JA. The estimation of cement film thickness by an in vivo technique. Br Dent J 1971; 131: 107-11.
Bindl A, Mormann WH. Marginal and internal fit of all-ceramic CAD/CAM crown-copings on chamfer preparations. J Oral Rehabil 2005; 32: 441-7.
Coli P, Karlsson S. Precision of a CAD/CAM technique for the production of zirconium dioxide copings. Int J Prosthodont 2004; 17: 577-80.
Rinke S, Huls A, Jahn L. Marginal accuracy and fracture strength of conventional and copy-milled all-ceramic crowns. Int J Prosthodont 1995; 8: 303-10.
Reich S, Wichmann M, Nkenke E, Proeschel P. Clinical fit of all-ceramic three-unit fixed partial dentures, generated with three different CAD/CAM systems. Eur J Oral Sci 2005; 113: 174-9.
Abduo J, Lyons K, Swain M. Fit of zirconia fixed partial denture: a systematic review. J Oral Rehabil 2010; 37: 866-76.
Kale E, Seker E, Yilmaz B, Ozcelik TB. Effect of cement space on the marginal fit of CAD-CAM-fabricated monolithic zirconia crowns. J Prosthet Dent 2016; 116: 890-5.
De Jager N, Pallav P, Feilzer AJ. The apparent increase of the Young's modulus in thin cement layers. Dent Mater 2004; 20: 457-62.
Rekow ED, Harsono M, Janal M, Thompson VP, Zhang G. Factorial analysis of variables influencing stress in all-ceramic crowns. Dent Mater 2006; 22: 125-32.
Cunali RS, Saab RC, Correr GM, Cunha LFd, Ornaghi BP, Ritter AV, et al. Marginal and Internal Adaptation of Zirconia Crowns: A Comparative Study of Assessment Methods. Braz Dent J 2017; 28: 467-73.
Jalalian E, Sadegh M, Masoomi S, Jalalian S, Evazi Ziyaei A. Effect of Thickness of Zirconia Core on Marginal Adaptation of All-Ceramic Restorations. J Islam Dent Assoc Iran 2014; 26: 158-62.
Ahmed WM, Abdallah MN, McCullagh AP, Wyatt CCL, Troczynski T, Carvalho RM. Marginal Discrepancies of Monolithic Zirconia Crowns: The Influence of Preparation Designs and Sintering Techniques. J Prosthodont 2019; 28: 288-98.
Bankoğlu Güngör M, Karakoca Nemli S, Çağlar A, Aydın C, Yılmaz H. Clinical study on the success of posterior monolithic zirconia crowns and fixed dental prostheses: preliminary report. Acta Odontol Turc 2017; 34: 104-8.