Tags

Type your tag names separated by a space and hit enter

Retention of zirconium oxide ceramic crowns with three types of cement.
J Prosthet Dent. 2006 Aug; 96(2):104-14.JP

Abstract

STATEMENT OF PROBLEM

Information about the retentive strength of luting agents for zirconium oxide-based crowns is limited. It is unknown if this type of high-strength ceramic restoration requires adhesive cementation to enhance retention.

PURPOSE

The purpose of this in vitro study was to determine the ability of selected luting agents to retain a representative zirconium oxide ceramic crown under clinically simulated conditions.

MATERIAL AND METHODS

Recently extracted human molars were prepared with a flat occlusal surface, 20-degree taper, and approximately 4-mm axial length. The axial and occlusal surface areas were determined, and specimens were distributed equally by total surface area into 3 cementation groups (n=12). Zirconium oxide ceramic copings (Procera AllZirkon) with an occlusal bar to facilitate removal were fabricated using computer-aided design/computer-assisted manufacturing (CAD/CAM) technology. All copings were airborne-particle abraded with 50-mum Al(2)O(3) and then cleaned in an ultrasonic bath with isopropyl alcohol. Provisional cement was removed from the prepared teeth, followed by a pumice prophy. After trial insertion, the copings were cleaned with phosphoric acid, rinsed, dried, and dehydrated with isopropyl alcohol. They were then cemented with a seating force of 10 kg per tooth, using either a composite resin cement with adhesive agent (Panavia F 2.0 and ED Primer A & B [PAN]), a resin-modified glass ionomer cement (Rely X Luting [RXL]), or a self-adhesive modified composite resin (Rely X Unicem [RXU]). The cemented copings were thermal cycled at 5 degrees C and 55 degrees C for 5000 cycles with a 15 second dwell time, and then removed along the path of insertion using a universal testing machine at 0.5 mm/min. The removal force was recorded, and the stress of dislodgement was calculated using the surface area of each preparation. A 1-way analysis of variance was used to analyze the data (alpha=.05). The nature of failure was also recorded.

RESULTS

Mean dislodgement stresses were 5.1, 6.1, and 5.0 MPa for PAN, RXL, and RXU, respectively. The 1-way analysis of variance revealed no differences in mean crown removal stress among the 3 cementation groups. The predominant mode of failure was cement remaining principally on the zirconium oxide copings in 46% of the specimens, followed by cement found on the tooth in 25.7% of the specimens.

CONCLUSIONS

Within the limitations of this study, the 3 luting agents, with mean removal stresses ranging from 5.0 to 6.1 MPa were not significantly different. The use of a composite resin cement with a bonding agent did not yield higher coping retention compared to the other 2 cements tested.

Authors+Show Affiliations

Department of Restorative Dentistry, University of Washington, Seattle 98195-7456, USA. rpp4@u.washington.eduNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16911887

Citation

Palacios, Rosario P., et al. "Retention of Zirconium Oxide Ceramic Crowns With Three Types of Cement." The Journal of Prosthetic Dentistry, vol. 96, no. 2, 2006, pp. 104-14.
Palacios RP, Johnson GH, Phillips KM, et al. Retention of zirconium oxide ceramic crowns with three types of cement. J Prosthet Dent. 2006;96(2):104-14.
Palacios, R. P., Johnson, G. H., Phillips, K. M., & Raigrodski, A. J. (2006). Retention of zirconium oxide ceramic crowns with three types of cement. The Journal of Prosthetic Dentistry, 96(2), 104-14.
Palacios RP, et al. Retention of Zirconium Oxide Ceramic Crowns With Three Types of Cement. J Prosthet Dent. 2006;96(2):104-14. PubMed PMID: 16911887.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Retention of zirconium oxide ceramic crowns with three types of cement. AU - Palacios,Rosario P, AU - Johnson,Glen H, AU - Phillips,Keith M, AU - Raigrodski,Ariel J, PY - 2006/8/17/pubmed PY - 2006/10/28/medline PY - 2006/8/17/entrez SP - 104 EP - 14 JF - The Journal of prosthetic dentistry JO - J Prosthet Dent VL - 96 IS - 2 N2 - STATEMENT OF PROBLEM: Information about the retentive strength of luting agents for zirconium oxide-based crowns is limited. It is unknown if this type of high-strength ceramic restoration requires adhesive cementation to enhance retention. PURPOSE: The purpose of this in vitro study was to determine the ability of selected luting agents to retain a representative zirconium oxide ceramic crown under clinically simulated conditions. MATERIAL AND METHODS: Recently extracted human molars were prepared with a flat occlusal surface, 20-degree taper, and approximately 4-mm axial length. The axial and occlusal surface areas were determined, and specimens were distributed equally by total surface area into 3 cementation groups (n=12). Zirconium oxide ceramic copings (Procera AllZirkon) with an occlusal bar to facilitate removal were fabricated using computer-aided design/computer-assisted manufacturing (CAD/CAM) technology. All copings were airborne-particle abraded with 50-mum Al(2)O(3) and then cleaned in an ultrasonic bath with isopropyl alcohol. Provisional cement was removed from the prepared teeth, followed by a pumice prophy. After trial insertion, the copings were cleaned with phosphoric acid, rinsed, dried, and dehydrated with isopropyl alcohol. They were then cemented with a seating force of 10 kg per tooth, using either a composite resin cement with adhesive agent (Panavia F 2.0 and ED Primer A & B [PAN]), a resin-modified glass ionomer cement (Rely X Luting [RXL]), or a self-adhesive modified composite resin (Rely X Unicem [RXU]). The cemented copings were thermal cycled at 5 degrees C and 55 degrees C for 5000 cycles with a 15 second dwell time, and then removed along the path of insertion using a universal testing machine at 0.5 mm/min. The removal force was recorded, and the stress of dislodgement was calculated using the surface area of each preparation. A 1-way analysis of variance was used to analyze the data (alpha=.05). The nature of failure was also recorded. RESULTS: Mean dislodgement stresses were 5.1, 6.1, and 5.0 MPa for PAN, RXL, and RXU, respectively. The 1-way analysis of variance revealed no differences in mean crown removal stress among the 3 cementation groups. The predominant mode of failure was cement remaining principally on the zirconium oxide copings in 46% of the specimens, followed by cement found on the tooth in 25.7% of the specimens. CONCLUSIONS: Within the limitations of this study, the 3 luting agents, with mean removal stresses ranging from 5.0 to 6.1 MPa were not significantly different. The use of a composite resin cement with a bonding agent did not yield higher coping retention compared to the other 2 cements tested. SN - 0022-3913 UR - https://www.unboundmedicine.com/medline/citation/16911887/Retention_of_zirconium_oxide_ceramic_crowns_with_three_types_of_cement_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0022-3913(06)00304-0 DB - PRIME DP - Unbound Medicine ER -