Fogorvosi szemle, 2014 (107. évfolyam, 1-4. szám)
2014-03-01 / 1. szám
13 FOGORVOSI SZEMLE ■ 107. évf. 1. sz. 2014. 2. Breschi L, Mazzoni A, De Stefano Dorigo E and Ferrari M: Adhesion to intraradicular dentin: A review. J Adh Sci Tech 2009; 23: 1053-1083. 3. Guazzato M, Albakry M, Ringer SP, Swain MV: Strength, fracture toughness and microstructure of a selection of all-ceramic materials. Part II. Zirconia-based dental ceramics. Dent Mater 2004; 20: 449-456. 4. Hayashi M, Ebisu S: Key factors in achieving firm adhesion in post-core restorations. Jap Dent Sei Rev 2008; 44: 22-28. 5. Hegedűs Cs, Szöőr Gy, Balázs É, Bukovinszki K, Keszthelyi G: Fogászatban alkalmazott szilánkerámia rendszerek differenciál termoanalitikai vizsgálata. Fogorv Szle 2000; 93: 66-76. 6. McLaren J, McLaren Cl, Yaman P, Bin-Shuwaish MS, Dennison JD, McDonald NJ: The effect of post type and length on the fracture resistance of endodontically treated teeth J Prosthet Dent 2009; 101: 174-182. 7. Morgano SM, Brackett SE: Foundation restorations in fixed prosthodontics: Current knowledge and future needs. J Prosthet Dent 1999; 82: 643-657. 8. Nothdurft FP, Pospiech PR: Clinical evaluation of pulpless teeth restored with conventionally cemented zirconia posts: A pilot study. J Prosthet Dent 2006; 95: 311-314. 9. Pereira JR, Valle AL, Shiratori FK, Ghizoni JS, Meló MP: Influence of intraradicular post and crown ferrule on the fracture strength of endodontically treated teeth. Braz Dent J 2009; 20:297-302. 10. Peutzfeldt A, Sahafi A, Asmussen E: A survey of failed postretained restorations. Clin Oral Investig 2008; 12: 37-44. 11. Qing H, Zhu Z, Chao Y, Zhang W: In vitro evaluation of the fracture resistance of anterior endodontically treated teeh restored with glass fiber and zircon posts. J Prosthet Dent 2007; 97: 93-98. 12. Schwartz RS, Robbins JW: Post placement and restoration of endodontically treated teeth: A literature rewiew. J Endod 2004; 30: 289-301. 13. Slutzky-Goldberg I, Slutzky H, Gorfil C and Smidt A: Restoration of endodontically treated teeth. Rewiew and treatment recommendations. Int J Dent 2009; 2009: 150251. 14. Stankiewicz NR, Wilson PR: The ferrule effect: a literature rewiew. Int Endod J 2002; 35: 575-581. 15. Thompson JY, Stoner BR, Piascik JR, Smith R: Adhesion/cementation to zirconia and other non-silicate ceramics: Where are we now? Dent Mater 2011 ; 27: 71-82. 16. Yenisey M, Kulunk S: Effects of chemical surface treatments of quartz and glass fiber posts on the retention of a composite resin. J Prosthet Dent 2008; 99: 38-45. Pétercsák A, Radios T, Hegedűs Cs Advantages and disadvantages of applying yttrium stabilized zirconium-dioxide post and core restorations Full ceramic restorations are associated with metal free post and core prosthodontics for teeth with seriously destroyed clinical crowns. Using custom made zirconium-dioxide post and cores can be flattering not only to give a good aesthetic result, but also to provide excellent retention. As none of the post systems stands all demands, prudent planning is mandatory. Our paper deals with favourable and unfavourable conditions as well as common causes of failures of post and core restorations. We took morphological, esthetical and functional considerations that can help to achieve the best results. Amongst them individual anatomic constitution, shape, width and length of the root and root canal, shape of the clinical crown, direction and magnitude of chewing forces are the most important factors. To give examples we present two cases of zirconium-dioxide post and core restorations. In our first case the missing clinical crown and a too wide root canal entrance created a questionable prognosis. To minimize adverse effect of the missing ferrule effect we applied custom-made zirconium-dioxide post and core and an additional abutment. After 7 years the restoration is still functioning. The second case represented a much favourable situation with 1,5 mm clinical crown height. The restoration was a custom-made zirconia post and core and a full-ceramic crown as a single tooth restoration. Although in this case we expected a better prognosis, 15 months later the patient showed up with a post fracture for applying extreme forces on the crown. Key words: zirconia-dioxide, post and core, endodontically treated teeth, prosthodontic planning
