Comparison of Retention and Seating of Implant-Supported Hard and Soft Metal Copings
Abstract
Objectives: Implant-supported restorations are generally used for the replacement of the lost teeth. Stability against masticatory forces and proper retention are critical for optimal durability of restorations. The aim of this experimental study was to compare the retention of cobalt-chromium (Co-Cr) copings made by different techniques.
Materials and Methods: Twenty-four solid abutment analogs were mounted and scanned with a desktop scanner. They were divided into two groups (n=12) and received metal copings fabricated by either soft or hard Co-Cr alloy. Soft Ceramill Sintron Co-Cr patterns were milled and sintered. Hard Co-Cr blocks were milled in a milling machine. The copings were sandblasted, polished, adjusted, and placed on the respective abutments. The frequency of adjustments was recorded for each abutment. The copings were cemented with zinc phosphate cement and underwent tensile test by a universal testing machine. The Mann-Whitney test and t-test were used to compare the two groups (α=0.05).
Results: There was no significant difference in retention of copings between the experimental groups. The mean retentive force was 559.58±115.66 N and 557.13 ±130.48 N for the soft and hard metal groups, respectively (P=0.96). Considering the non-normal distribution of adjustment frequency data, the Mann-Whitney test showed that the frequency of adjustments was significantly higher in the hard metal group than the soft metal group (9.5 versus 0.1667; P<0.001).
Conclusion: Although hard metal copings required more adjustments, retention of soft and hard Co-Cr copings was not significantly different.
2. Wood MR, Vermilyea SG. A review of selected dental literature on evidence-based treatment planning for dental implants: report of the Committee on Research in Fixed Prosthodontics of the Academy of Fixed Prosthodontics. J Prosthet Dent. 2004 Nov;92(5):447-62.
3. Lövgren N, Roxner R, Klemendz S, Larsson C. Effect of production method on surface roughness, marginal and internal fit, and retention of cobalt-chromium single crowns. J Prosthet Dent. 2017 Jul;118(1):95-101.
4. Emms M, Tredwin CJ, Setchell DJ, Moles DR. The effects of abutment wall height, platform size, and screw access channel filling method on resistance to dislodgement of cement-retained, implant-supported restorations. J Prosthodont. 2007 Jan-Feb;16(1):3-9.
5. Bernal G, Okamura M, Munoz CA. The effects of abutment taper, length and cement type on resistance to dislodgement of cement‐retained, implant‐supported restorations. J Prosthodont. 2003 Jun;12(2):111-5.
6. Edelhoff D, Özcan M. To what extent does the longevity of fixed dental prostheses depend on the function of the cement? Working Group 4 materials: cementation. Clin Oral Implants Res. 2007 Jun;18(s3):193-204.
7. Krämer N, Lohbauer U, Frankenberger R. Adhesive luting of indirect restorations. Am J Dent. 2000 Nov;13(Spec No):60-76.
8. Cameron SM, Morris WJ, Keesee SM, Barsky TB, Parker MH. The effect of preparation taper on the retention of cemented cast crowns under lateral fatigue loading. J Prosthet Dent. 2006 Jun;95(6):456-61.
9. Zidan O, Ferguson GC. The retention of complete crowns prepared with three different tapers and luted with four different cements. J Prosthet Dent. 2003 Jun;89(6):565-71.
10. Ucar Y, Brantley WA, Johnston WM, Dasgupta T. Mechanical properties, fracture surface characterization, and microstructural analysis of six noble dental casting alloys. J Prosthet Dent. 2011 Jun;105(6):394-402.
11. Hedberg YS, Qian B, Shen Z, Virtanen S, Wallinder IO. In vitro biocompatibility of CoCrMo dental alloys fabricated by selective laser melting. Dent Mater. 2014 May;30(5):525-34.
12. Jang SH, Lee DH, Ha JY, Hanawa T, Kim KH, Kwon TY. Preliminary evaluation of mechanical properties of Co-Cr alloys fabricated by three new manufacturing processes. Int J Prosthodont. 2015 Jul-Aug;28(4):396-8.
13. Pasali B, Sarac D, Kaleli N, Sarac YS. Evaluation of marginal fit of single implant-supported metal-ceramic crowns prepared by using presintered metal blocks. J Prosthet Dent. 2018 Feb;119(2):257-62.
14. Kim EH, Lee DH, Kwon SM, Kwon TY. A microcomputed tomography evaluation of the marginal fit of cobalt-chromium alloy copings fabricated by new manufacturing techniques and alloy systems. J Prosthet Dent. 2017 Mar;117(3):393-9.
15. Akçin ET, Güncü MB, Aktaş G, Aslan Y. Effect of manufacturing techniques on the marginal and internal fit of cobalt-chromium implant-supported multiunit frameworks. J Prosthet Dent. 2018 Nov;120(5):715-20.
16. 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 Oct;112(4):909-13.
17. 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 May/Jun;30(3):304-5.
18. Viennot S, Dalard F, Lissac M, Grosgogeat B. Corrosion resistance of cobalt-chromium and palladium-silver alloys used in fixed prosthetic restorations. Eur J Oral Sci. 2005 Feb;113(1):90-5.
19. Craig R, Hanks C. Reaction of fibroblasts to various dental casting alloys. J Oral Pathol Med. 1988 Aug;17(7):341-7.
20. Al Jabbari YS. Physico-mechanical properties and prosthodontic applications of Co-Cr dental alloys: a review of the literature. J Adv Prosthodont. 2014 Apr;6(2):138-45.
21. Krug KP, Knauber AW, Nothdurft FP. Fracture behavior of metal-ceramic fixed dental prostheses with frameworks from cast or a newly developed sintered cobalt-chromium alloy. Clin Oral Investig. 2015 Mar;19(2):401-11.
22. Stawarczyk B, Eichberger M, Hoffmann R, Noack F, Schweiger J, Edelhoff D, et al. A novel CAD/CAM base metal compared to conventional CoCrMo alloys: an in-vitro study of the long-term metal-ceramic bond strength. Oral Health Dent Manag. 2014 Jun;13(2):446-52.
23. Han HS, Yang HS, Lim HP, Park YJ. Marginal accuracy and internal fit of machine-milled and cast titanium crowns. J Prosthet Dent. 2011 Sep;106(3):191-7.
24. Mai HN, Kwon TY, Hong MH, Lee DH. Comparative study of the fit accuracy of full-arch bar frameworks fabricated with different presintered cobalt-chromium alloys. Biomed Res Int. 2018 Aug;5(2018):1962514.
25. Olivera AB, Saito T. The effect of die spacer on retention and fitting of complete cast crowns. J Prosthodont. 2006 Jul-Aug;15(4):243-9.
26. Torabi K, Azarian M. Study of the effect of die spacing (cement space) on cast crown retention. J Dent. (Shiraz). 2003 Sep;4(2):16-23.
27. Ergin S, Germalmaz D. Retentive properties of five different luting cements on base and noble metal copings. J Prosthet Dent. 2002 Nov;88(5):491-7.
28. Kazemi M, Pornasrollah A, Allahyari S, Jalali H. Retention of castings fabricated by plastic coping and direct wax up for single crown and bridge in different implant systems. J Dent Med. 2015 Jul;28(2):86-94.
29. Chaudhari BY, Kanoongo N, Sulakhe S, Pathak SD. Shrinkage analysis of wax patterns for aerospace components in investment casting process. IOSR-JMCE. 2013;22(12):25-9.
| Files | ||
| Issue | Vol 17 (Continuously Published Article-Based) | |
| Section | Original Article | |
| DOI | https://doi.org/10.18502/fid.v17i26.4652 | |
| Keywords | ||
| Computer-Aided Design Dental Implants Dental Prosthesis Retention Hard Metal | ||
| Rights and permissions | |
|
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
