Original Research Article
Year: 2018 | Month: January | Volume: 8 | Issue: 1 | Pages: 101-110
Retention of All Ceramic Crown Preparation with Two Different Tapers Luted by Two Different Cements
Bashayer Saud Alsharif1, Dr. Shereen Elsayed2
1Dental Intern, Makkah, Saudi Arabia
2Prosthodontic Department, Faculty of Dentistry, Umm-Al-Qura University, Saudi Arabia.
Corresponding Author: Bashayer Saud Alsharif
ABSTRACT
Background: The popularity of all ceramic restorations has increased recently due to superior esthetic appearance. Zirconium oxide all ceramic material constructed using CAD/CAM technology demonstrates one of the most successful systems that are used nowadays. Retention is very important factor to prevent dislodgement of prosthetic restoration and ensures the restoration longevity.
Objectives: The aim of this study was to evaluate the retentive strength of zirconia crowns luted using two different luting agents on two different preparations.
Material and methods: A total of 20 extracted non carious premolars teeth were collected and prepared using standardized technique. The prepared teeth were divided into two equal groups based on the degree of preparation taper, group I: all ceramic crown preparation were done with (5-10°) degrees and group II: all ceramic crown preparation were done with (15-20°) degrees taper, then every group was further subdivided into two equal subgroups according to cement type (Polycarboxylate and adhesive resin cement). Zirconia crowns were constructed. Retention of the crowns was measured using universal testing machine.
Result:
- Cements with (5-10°) taper exhibited higher retentive strength value than cements with (15-20°) difference were statistically significant.
- Regarding the types of the cement, there was no statistical significant difference between retentive stress values of subgroups.
Conclusion:
- Teeth prepared with 5-10° taper greatly improved the retention values than teeth prepared with 15-20° taper with both cement types.
- Adhesive resin cement exhibited better retention values than polycarboxylate cement for both preparations taper.
Key words: Zirconia, all-ceramic, polycarboxylate, resin, retention