J Adv Prosthodont.  2013 May;5(2):118-125. 10.4047/jap.2013.5.2.118.

Effect of span length on the fit of zirconia framework fabricated using CAD/CAM system

• Lee JY
• Choi SJ
• Kim MS
• Kim HY
• Kim YS
• Shin SW

• KMID: 2284750
• DOI: http://doi.org/10.4047/jap.2013.5.2.118

Abstract

PURPOSE
The purpose of this study was to evaluate the effect of the span length on the fit of zirconia framework fabricated using CAD/CAM system.
MATERIALS AND METHODS
Abutments for single, 4-unit and 6-unit fixed partial prostheses were fabricated. Ten zirconia frameworks were fabricated for each group. The marginal and internal gap were presented by means of replica technique and measured by measuring microscope (AXIO(R), Carl Zeiss, Rochester, NY) and software (I-solution(R), IMT i-solution Inc., Vancouver, BC, Canada). The results were statistically analyzed by multivariate analysis test and Dunnett T3 test for post hoc test (alpha=.05).
RESULTS
There were statistically significant differences at 2, 4, 7, 8 points (mesio-distal section) and b, d, e, f, g (labio-lingual section). In some marginal reference points of 6-unit group (P<.05), the marginal gap were larger than 120 microm.
CONCLUSION
Span length of zirconia core may have an influence on marginal and internal fit. Within the limitation of this study, the increase of span length of zirconia framework of 6 or more-unit fixed partial denture may decrease the marginal and internal fit.

Keyword

Zirconia; CAD/CAM; Span length; Fit

MeSH Terms

Denture, Partial, Fixed
Multivariate Analysis
Prostheses and Implants
Replica Techniques
Zirconium
Surveys and Questionnaires
Zirconium

Figure

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  Fig. 1 Titanium master model fabricated using CAD/CAM (Addtech Co., Seoul, Korea). A: single, B: 4-unit, C: 6-unit.

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  Fig. 2 Duplicated master models with dental stone. A: single, B: 4-unit, C: 6-unit.

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  Fig. 3 Zirconia cores fabricated using CAD/CAM (Orapix, Seoul, Korea). A: single, B: 4-unit, C: 6-unit.

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  Fig. 4 Reference points to measure the thickness of fit checker (Left: mesio-distal, Right: labio-lingual).

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  Fig. 5 Directions and positions of section of replica materials (Left: directions of labio-lingual and mesiodistal section, Right: view of labio-lingual section).

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  Fig. 6 Measurement of thickness of Fit checker® at each reference point (A: labial reference point, B: incisalreference point, C: marginal reference point, D: lingual reference point).

Reference

1. Seghi RR, Denry IL, Rosenstiel SF. Relative fracture toughness and hardness of new dental ceramics. J Prosthet Dent. 1995; 74:145–150.

2. Reich S, Kappe K, Teschner H, Schmitt J. Clinical fit of four-unit zirconia posterior fixed dental prostheses. Eur J Oral Sci. 2008; 116:579–584.

3. Luthardt RG, Holzhüter M, Sandkuhl O, Herold V, Schnapp JD, Kuhlisch E, Walter M. Reliability and properties of ground Y-TZP-zirconia ceramics. J Dent Res. 2002; 81:487–491.

4. Tinschert J, Natt G, Mautsch W, Spiekermann H, Anusavice KJ. Marginal fit of alumina-and zirconia-based fixed partial dentures produced by a CAD/CAM system. Oper Dent. 2001; 26:367–374.

5. Suttor D, Bunke K, Hoescheler S, Hauptmann H, Hertlein G. LAVA-the system for all-ceramic ZrO₂ crown and bridge frameworks. Int J Comput Dent. 2001; 4:195–206.

6. 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; 53:24–29.

7. Karlsson S. The fit of Procera titanium crowns. An in vitro and clinical study. Acta Odontol Scand. 1993; 51:129–134.

8. 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; 113:174–179.

9. Bindl A, Mörmann WH. Marginal and internal fit of all-ceramic CAD/CAM crown-copings on chamfer preparations. J Oral Rehabil. 2005; 32:441–447.

10. Sulaiman F, Chai J, Jameson LM, Wozniak WT. A comparison of the marginal fit of In-Ceram, IPS Empress, and Procera crowns. Int J Prosthodont. 1997; 10:478–484.

11. Tuntiprawon M, Wilson PR. The effect of cement thickness on the fracture strength of all-ceramic crowns. Aust Dent J. 1995; 40:17–21.

12. Lawn BR, Pajares A, Zhang Y, Deng Y, Polack MA, Lloyd IK, Rekow ED, Thompson VP. Materials design in the performance of all-ceramic crowns. Biomaterials. 2004; 25:2885–2892.

13. Thompson VP, Rekow DE. Dental ceramics and the molar crown testing ground. J Appl Oral Sci. 2004; 12:26–36.

14. Rekow D, Thompson VP. Near-surface damage-a persistent problem in crowns obtained by computer-aided design and manufacturing. Proc Inst Mech Eng H. 2005; 219:233–243.

15. Sailer I, Fehér A, Filser F, Gauckler LJ, Lüthy H, Hämmerle CH. Five-year clinical results of zirconia frameworks for posterior fixed partial dentures. Int J Prosthodont. 2007; 20:383–388.

16. Tinschert J, Schulze KA, Natt G, Latzke P, Heussen N, Spiekermann H. Clinical behavior of zirconia-based fixed partial dentures made of DC-Zirkon: 3-year results. Int J Prosthodont. 2008; 21:217–222.

17. Molin MK, Karlsson SL. Five-year clinical prospective evaluation of zirconia-based Denzir 3-unit FPDs. Int J Prosthodont. 2008; 21:223–227.

18. Beuer F, Naumann M, Gernet W, Sorensen JA. Precision of fit: zirconia three-unit fixed dental prostheses. Clin Oral Investig. 2009; 13:343–349.

19. Hung SH, Hung KS, Eick JD, Chappell RP. Marginal fit of porcelain-fused-to-metal and two types of ceramic crown. J Prosthet Dent. 1990; 63:26–31.

20. Abduo J, Lyons K, Swain M. Fit of zirconia fixed partial denture: a systematic review. J Oral Rehabil. 2010; 37:866–876.

21. May KB, Russell MM, Razzoog ME, Lang BR. Precision of fit: the Procera AllCeram crown. J Prosthet Dent. 1998; 80:394–404.

22. Rahme HY, Tehini GE, Adib SM, Ardo AS, Rifai KT. In vitro evaluation of the "replica technique" in the measurement of the fit of Procera crowns. J Contemp Dent Pract. 2008; 9:25–32.

23. Laurent M, Scheer P, Dejou J, Laborde G. Clinical evaluation of the marginal fit of cast crowns-validation of the silicone replica method. J Oral Rehabil. 2008; 35:116–122.

24. Moldovan O, Luthardt RG, Corcodel N, Rudolph H. Three-dimensional fit of CAD/CAM-made zirconia copings. Dent Mater. 2011; 27:1273–1278.