Dentistry

doi: 10.25005/2074-0581-2022-24-3-344-352
EVALUATION OF FITTING ACCURACY OF METAL FRAMEWORKS OF FIXED DENTURES DEPENDING ON THEIR LENGTH

А.N. Parkhomenko, V.I. Shemonaev

Department of Orthopedic Dentistry with the Course of Clinical Dentistry, Volgograd State Medical University, Volgograd, Russian Federation

Objective: To carry out a comparative analysis of the accuracy of the adherence of tooth-supported cast and milled cobalt chrome alloy frameworks in the shoulder area depending on the length of the prostheses.

Methods: For the clinical trial 314 patients who needed metal-ceramic fixed dental prostheses (FDPs) were recruited. Metal frameworks of prostheses were made with conventional lost-wax technique (CLW) and computer aided design and manufacturing (CAD/CAM). To assess the accuracy of the adhesion of the frameworks to the ledges of the prepared teeth stumps, the silicon film between the abutment teeth and inner surface of crowns was obtained, cut into 8 pieces and measured in the shoulder area. The marginal gaps were measured using ImageJ2 application from digital photos obtained with calibrated digital microscope (250×). The data obtained were analyzed using the non-parametric Kruskal-Wallis H-test and Mann- Whitney U-test.

Results: The average values of the marginal gap in the CLW group ranged from 71.9±7.6 μm in single and double crowns to 117±3.7 μm in prostheses with a length of 7-8 units. With a corresponding increase in the length of the prostheses, the average values of the marginal gap in the CAD/CAM group were from 67.1±6.8 μm to 90.8±8.3 μm. Differences in marginal clearance parameters between all groups were statistically significant (p<0.05), except for the group of single and paired crowns with milled caps.

Conclusion: The values of the edge gap in all groups were within the acceptable range. However, CAD/CAM frameworks were significantly more accurate in long-length prostheses.

Keywords: Teeth prep, CAD/CAM, accuracy of the fit, ledge, precision of the fit, marginal gap.

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References
  1. Sadid-Zadeh R, Katsavochristou A, Squires T, Simon M. Accuracy of marginal fit and axial wall contour for lithium disilicate crowns fabricated using three digital workflows. Research and Education. 2020;1:121-7.
  2. Ahmed WM, Shariati B, Gazzaz AZ, Sayed ME, Carvalho RM. Fit of toothsupported zirconia single crowns – A systematic review of the literature. Clin Exp Dent Res. 2020;6 700-716.
  3. Piras F, Berro-Filho J, Rubo J, Ferruzzi F, Ferrairo B, Mosquim V. Marginal and internal space of metallic copings. Dent Mater. 2016;32:e75.
  4. Sadykov MI, Nesterov AM, Domenyuk DA, Ertesyan AR, Konnov VV, Matrosov V. Biomechanical evaluation of stress-strain condition of restorative ceramic pin structures and dental roots. Archiv EuroMedica. 2020;2:115-20.
  5. Nawafleh NA, Mack F, Evans J, Mackay J, Hatamleh MM. Accuracy and reliability of methods to measure marginal adaptation of crowns and FDPs: A literature review. J Prosthodont. 2013;22:419-28.
  6. Fathi HM, Al-Masoody AH, El-Ghezawi N, Johnson A. The accuracy of fit of crowns made from wax patterns produced conventionally (hand formed) and via CAD/CAM technology. Eur J Prosthodont Restor Dent. 2016;24:10-7.
  7. Roperto R, Assaf H, Soares-Porto T, Lang L, Teich S. Are different generations of CAD/CAM milling machines capable to produce restorations with similar quality? J Clin Exp Dent. 2016;8:e423-e428.
  8. Keul C, Stawarczyk B, Erdelt KJ, Beuer F, Edelhoff D, Güth JF. Fit of 4-unit FDPs made of zirconia and CoCr-alloy after chairside and labside digitalization – a laboratory study. Dent Mater. 2014;30:400-7.
  9. de França DG, Morais MH, das Neves FD, Barbosa GA. Influence of CAD/CAM on the fit accuracy of implant-supported zirconia and cobalt-chromium fixed dental prostheses. J Prosthet Dent. 2015;113:22-8.
  10. Rödiger M, Schneider L, Rinke S. Influence of material selection on the marginal accuracy of CAD/CAM-fabricated metal- and all-ceramic single crown copings. BioMed Research International. 2018;2:1-8.
  11. Kim DY, Kim JH, Kim HY, Kim WC. Comparison and evaluation of marginal and internal gaps in cobalt-chromium alloy copings fabricated using subtractive and additive manufacturing. J Prosthodont Res. 2018;62:56-64.
  12. Bajunaid S, Altwaim B, Alhassan M, Alammari R. The fit accuracy of removable partial denture metal frameworks using conventional and 3D printed techniques: An in vitro study. The Journal of Contemporary Dental Practice. 2019;20:476-81.
  13. Flügge T, van der Meer WJ, Gonzalez BG, Vach K, Wismeijer D, Wang P. The accuracy of different dental impression techniques for implant-supported dental prostheses: A systematic review and meta-analysis. Clin Oral Impl Res. 2018;29(Suppl 16):374-92.
  14. Tan K, Dudley J. The marginal gaps of sequentially milled lithium disilicate crowns using two different milling units. Aust Dent J. 2022;10.1111/adj.12909.
  15. Praça L, Pekam FC, Rego RO, Radermacher K, Wolfart S, Marotti J. Accuracy of single crowns fabricated from ultrasound digital impressions. Dent Mater. 2018;34:e280-e288.
  16. Ibragimov TI, Aristova IYa, Ataeva SD, Baskov DV, Batrak IK, Kuznetsov OE, Novichkova MS, Tsalikova NA. A method for clinical evaluation of the accuracy of manufacturing fixed dentures. Patent RF No. 2491033, 2013.
  17. Colpani JT, Borba M, Della Bona Á. Evaluation of marginal and internal fit of ceramic crown copings. Dent Mater 2013; 29(2):174-180.
  18. Fathi H, Al-Masoody A, El-Ghezawi N, Johnson A. The accuracy of fit of crowns made from wax patterns produced conventionally (hand formed) and via CAD/ CAM technology. Eur J Prosthodont Restor Dent. 2016;24(1):10-7.
  19. Al-Atyaa ZT, Majeed MA. Comparative evaluation of the marginal and internal fitness of monolithic CAD/CAM zirconia crowns fabricated from different conventional impression techniques and digital impression using silicone replica technique (an in vitro study). Biomed Pharmacol J. 2018;11(1):477-90.
  20. Amelya A, Odang RW, Nelwan LC. Accuracy of the marginal fit of all-ceramic crowns fabricated by direct and indirect digital scanning methods. J Phys: Conf Ser. 2018;1073:022011.
  21. Rödiger M, Heinitz A, Bürgers R, Rinke S. Fitting accuracy of zirconia single crowns produced via digital and conventional impressions – a clinical comparative study. Clin Oral Invest. 2017;21:579-87.
  22. Selz CF, Bogler J, Vach K, Strub JR, Guess PC. Veneered anatomically designed zirconia FDPs resulting from digital intraoral scans: Preliminary results of a prospective clinical study. J Dent. 2015;43(12):1428-35.
  23. Boeddinghaus M, Breloer ES, Rehmann P, Wöstmann B. Accuracy of singletooth restorations based on intraoral digital and conventional impressions in patients. Clin Oral Investig. 2015;19:2027-34.
  24. Svanborg P. A systematic review on the accuracy of zirconia crowns and fixed dental prostheses. Biomater Investig Dent. 2020;7(1):9-15.
  25. Kumar HC, Kumar TP, Hemchand S, Suneelkumar C, Subha A. Accuracy of marginal adaptation of posterior fixed dental prosthesis made from digital impression technique: A systematic review. J Indian Prosthodont Soc. 2020;20(2):123-30.
  26. Woong KK, Sunjai K. Effect of number of pontics and impression technique on the accuracy of four-unit monolithic zirconia fixed dental prostheses. J Prosthet Dent. 2018;119(5):860.

Authors' information:


Parkhomenko Aleksey Nikolaevich
Candidate of Medical Sciences, Assistant of the Department of Orthopedic Dentistry with the Course of Clinical Dentistry, Volgograd State Medical University Researcher ID: AIC-6618-2022 Scopus ID: 57204615809 ORCID ID: 0000-0001-5479-2531 SPIN: 4044-3577 Author ID: 719221 E-mail: aleksei.aleksei.parhomen@mail.ru

Shemonaev Viktor Ivanovich
Doctor of Medical Sciences, Professor, Head of the Department of Orthopedic Dentistry with the Course of Clinical Dentistry, Volgograd State Medical University Researcher ID: CAG-0856-2022 Scopus ID: 57204628039 ORCID ID: 0000-0001-8345-4881 SPIN: 3231-9777 Author ID: 480324 E-mail: ShemonaevVI@yandex.ru

Information about support in the form of grants, equipment, medications

The research was carried out in accordance with the research plan of the Department of Orthopedic Dentistry with the Course of Clinical Dentistry, Volgograd State Medical University (state registration number – АААА-А20-120040550002-3). The authors did not receive financial support from manufacturers of medicines and medical equipment

Conflicts of interest: No conflict

Address for correspondence:


Parkhomenko Aleksey Nikolaevich
Candidate of Medical Sciences, Assistant of the Department of Orthopedic Dentistry with the Course of Clinical Dentistry, Volgograd State Medical University

400005, Russian Federation, Volgograd, Kommunisticheskaya str., 31, of. 4-10

Tel.: +7 (988) 3918015

E-mail: aleksei.aleksei.parhomen@mail.ru

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