Abstract:

Marginal adaptation plays an important role in the clinical success of any prostheses. Ideal marginal adaptation can produce less gingival irritation and cement dissolution. The presence of marginal discrepancies increases plaque accumulation, secondary caries, pulpal lesions, postoperative sensitivity, periodontal disease and marginal discoloration leading to abutment failure and in turn failure of the prosthesis. A maxillary first molar typhodont tooth was prepared with an aerator handpiece. To make the monolithic zirconia crowns, the prepared tooth was scanned and the STL file was used to design a crown using CAD/CAM software. To fabricate the indirect composite crowns, a clear acrylic mould was created, in which the indirect composite was filled and the tooth was placed. The samples were then placed in a curing unit. The samples were then examined under a stereomicroscope.  With the aid of imaging software, marked calibrations were calculated at four marked regions- buccal, distal, lingual and mesial margins. Monolithic zirconia adaptation showed statistically significant results when compared to that of indirect composite crowns (p<0.05). According to the site, results varied with zirconia crowns adapting better in buccal and mesial sites whereas indirect composite crowns adapted better in the distal and lingual sites. Overall, monolithic zirconia adapted statistically significantly better to the prepared typhodont tooth than the indirect composite crowns and should be used as a material of choice for crowns.

References:

[1].   Akmal, N. L. H. B. I., & Duraisamy, R., 2020, Evaluation of the marginal fit of implant-supported crowns. Journal of Long-Term Effects of Medical Implants, 30(3), 165-172.

[2].   Vaishali S, Duraisamy R., 2022, Esthetics using monolithic zirconia and hand-layered zirconia fixed partial denture, Bioinformation.;18(7):651.

[3].   Kanat-Ertürk, B., Çömlekoğlu, E. M., Dündar-Çömlekoğlu, M., Özcan, M., & Güngör, M. A., 2015, Effect of veneering methods on zirconia framework-veneer ceramic adhesion and fracture resistance of single crowns. Journal of Prosthodontics, 24(8), 620-628.

[4].   Urapepon, S., & Taenguthai, P., 2015, The effect of zirconia framework design on the failure of all-ceramic crowns under static loading. Journal of Advanced Prosthodontics, 7(2), 146-150.

[5].   Hassan, L. A., & Goo, C. L., 2021, Effect of cement space on marginal discrepancy and retention of CAD/CAM crowns. Dental Materials Journal, 40(5), 1189-1195.

[6].   Papadiochou, S., & Pissiotis, A. L., 2018, Marginal adaptation and CAD-CAM technology: A systematic review of restorative material and fabrication techniques. Journal of Prosthetic Dentistry, 119(4), 545-551.

[7].   Heintze, S. D., 2007, Systematic reviews: I. The correlation between laboratory tests on marginal quality and bond strength. II. The correlation between marginal quality and clinical outcome. Journal of Adhesive Dentistry, 9(Suppl 1), 77-106.

[8].   Chaturvedi, S., Alqahtani, N. M., Addas, M. K., & Alfarsi, M. A., 2020, Marginal and internal fit of provisional crowns fabricated using 3D printing technology. Technology and Health Care, 28(6), 635-642.

[9].   McLean, J. W., & von Fraunhofer, J. A., 1971, The estimation of cement film thickness by an in vivo technique. British Dental Journal, 131(3), 107-111.

[10].  Rekow, D., & Thompson, V. P., 2005, Near-surface damage—a persistent problem in crowns obtained by computer-aided design and manufacturing. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 219(4), 233-243.

[11].  Jalalian, E., Younesi, F., Golalipour, S., Khorshidi, S., Mahdavisaedabadi, S. H., & Sayyari, M., 2023, Assessment of marginal and internal adaptation in provisional crowns utilizing three distinct materials. Journal of Contemporary Dental Practice, 24(11), 853-858.

[12].  Ellakwa, A., & Goh, D., 2023, The marginal accuracy of lithium disilicate single crowns is comparable when made from conventional or digital (direct or indirect) workflows. Journal of Evidence-Based Dental Practice, 23(4), 101914.

[13].  Miyazaki, T., Hotta, Y., Kunii, J., Kuriyama, S., & Tamaki, Y., 2009, A review of dental CAD/CAM: current status and future perspectives from 20 years of experience. Dental Materials Journal, 28(1), 44-56.

[14].  Baroudi, K., & Ibraheem, S. N., 2015, Assessment of chair-side computer-aided design and computer-aided manufacturing restorations: A review of the literature. Journal of International Oral Health, 7(4), 96-104.

[15].  Euán, R., Figueras-Álvarez, O., Cabratosa-Termes, J., & Oliver-Parra, R., 2014, Marginal adaptation of zirconium dioxide copings: Influence of the CAD/CAM system and the finish line design. Journal of Prosthetic Dentistry, 112(2), 155-162.

[16].  Contrepois, M., Soenen, A., Bartala, M., & Laviole, O., 2013, Marginal adaptation of ceramic crowns: A systematic review. Journal of Prosthetic Dentistry, 110(6), 447-454.e10.

[17].  Pelekanos, S., Koumanou, M., Koutayas, S. O., Zinelis, S., & Eliades, G., 2009, Micro-CT evaluation of the marginal fit of different In-Ceram alumina copings. European Journal of Esthetic Dentistry, 4(3), 278-292.

[18].  Shah, S., Nallaswamy, D., & Ganapathy, D., 2020, Marginal accuracy of milled versus cast cobalt chromium alloys in long-span implant-supported frameworks: A systematic review and meta-analysis. Journal of Advanced Oral Research, 11(2), 120-127.

[19].  Nejatidanesh, F., Shakibamehr, A. H., & Savabi, O., 2016, Comparison of marginal and internal adaptation of CAD/CAM and conventional cement retained implant-supported single crowns. Implant Dentistry, 25(1), 103-108.

[20].  Reddy, M. S., Ahmed, N., & Shasanka, K. (2020). A retrospective marginal fit evaluation of a fixed dental prosthesis framework fabricated by various dental students. International Journal of Dentistry and Oral Science, 7(11), 1094–1098. Available from November 25, 2020.

[21].  Merchant, A., Nallaswamy, D., Velayudhan, A., & Gada, S., 2020, Radiographic evaluation of marginal accuracy of metal coping in sectioned and unsectioned 3D printed models and gypsum models. World Journal of Dentistry, 11(5), 386-391.

[22].  Rayyan, M. R., 2019, Marginal adaptation of monolithic high-translucency versus porcelain-veneered zirconia crowns. International Journal of Prosthodontics, 32(4), 364-366.

[23].  Paul, N., Raghavendra Swamy, K. N., Dhakshaini, M. R., Sowmya, S., & Meravini, M., 2020, Marginal and internal fit evaluation of conventional metal-ceramic versus zirconia CAD/CAM crowns. Journal of Clinical and Experimental Dentistry, e31-37.

[24].  Neppelenbroek, K. H., 2015, The clinical challenge of achieving marginal adaptation in direct and indirect restorations. Journal of Applied Oral Science, 23(5), 448-449.

[25].  Torabi, K., Vojdani, M., Giti, R., & Taghva, M., 2015, The effect of various veneering techniques on the marginal fit of zirconia copings. Journal of Advanced Prosthodontics, 7(3), 233-239.