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Int Poster J Dent Oral Med 7 (2005), No. 3     15. Sep. 2005

Int Poster J Dent Oral Med 2005, Vol 7 No 03, Poster 277

Durability of Bonds between Luting Cements and High-Gold-Content Alloy

Language: English

Authors:
Dr. med. dent. Andree Piwowarczyk1, Karina Zatorska1, Klaus Lindemann2, Prof. Dr. med. dent. Hans-Christoph Lauer1
1Department of Prosthodontics, School of Dentistry, ZZMK (Carolinum), J. W. Goethe University, Frankfurt, Germany
2Dental Surgeon Major, German Air Force, Germersheim, Germany

Date/Event/Venue:
II. Deutsch-Polnisches Stomatologisches Symposium
March 4-5, 2005
Warsaw, Poland


Poster Award
Best Poster of Conference


Introduction

Luting cements must withstand the forces of mastication and parafunction in the warm and moist oral environment for many years and maintain their integrity while transferring stress from crowns or FPDs to tooth structures.


Objectives

Purpose
  • Determine long-term bond strength of various luting cements to high-gold-content alloy
  • Determine influence of artificial aging
  • Examine the mode of failure

Material and Methods

Preparation of specimens
  • High-gold-content alloy (Portadur P4; Wieland, Germany) specimens (Ø = 10 mm, h = 1 mm)
  • Plastic ring, embedded with slow-polymerizing epoxy (Palapress Vario; Heraeus Kulzer, Germany)
  • Wet grinding to 600 grit using SiC sandpaper (Buehler, USA)
  • Ultrasonic cleaning in 96% isopropanol for 3 min

Surface Treatment
  • Airborne-particle abrasion with 100 µm aluminium oxide at 2.8 bar and a distance of 10 mm for 10 seconds
  • Application of alloy primer according to the manufacturer\'s instructions (Panavia F/Alloy primer; Nexus 2/Optibond solo plus; Calibra/Prime&Bond NT and Selfcureactivator)

Material Manufacturer Type
PermaCem DMG
Hamburg,
Germany
dual-polymerzing
compomer cement
RelyX ARC 3M ESPE
Seefeld
Germany
dual-polymerzing
resin cement
Panavia F Kuraray
Osaka
Japan
dual-polymerzing
resin cement
Nexus 2 Kerr
Orange
USA
dual-polymerzing
resin cement
Calibra Dentsply
DeTray
Konstanz
Germany
dual-polymerzing
resin cement
RelyX Unicem 3M ESPE
Seefeld
Germany
dual-polymerzing
self-adhesive universal
resin cement
Tab. 1: Luting cements

Bonding Procedure
  • Specimens randomly assigned to 12 groups (n = 8 each)
  • Materials handled according to the manufacturer\'s instructions (Table 1)
  • Gelatin capsules (Ø = 5.5 mm; Torpac Inc., Fairfield, USA) filled with composite to within 2 mm below the rim
  • Capsules bonded perpendicular to the pre-treated high-gold-content alloy surface, applying a weight of 200 g for 10 min using a custom-made device

Specimen Treatment
  • Group A = aged and tested after 150 day / 37° water storage
  • Group B = aged and tested after 150 day / 37° water storage, subsequently thermally cycled 37,500 times (Willytec Typ V2.8; Willytec, Germany) between 5 °C and 55 °C

Bond Strength Testing
  • Applying shear force using a universal testing machine (Zwicki 1120; Zwick, Germany) at constant crosshead speed of 0.5 mm/min (Figure 1)

Mode of failure
  • Examination under a light microscope (Stemi 2000-C; Zeiss, Germany), magnification 30x
  • Cohesive failure within the bonding substrate, adhesive failure between the cement-bonding substrate interface, or mixed failure

Statistical Analysis
  • Two-way ANOVA model with all main effects (cementing agent (6 levels) and time of measurement (2 levels))
  • Multiple pairwise comparisons (Tukey)
  • Significance level (α=0.05)

Fig 1: Mounting jig

Results

  • Two-way ANOVA model analyzed significant differences between all main effects (all p<0.0001) and all corresponding interactions (p=0.0376)

  • Significant differences (p<0.0001) existed between the six luting cements, and the two times of measurement

  • Panavia F reached the highest bond strength values (10.8 ± 2.0 MPa), followed by RelyX Unicem (9.4 ± 0.8 MPa)

  • Significant differences (all p<0.02) were seen between Panavia F and all other materials (PermaCem, RelyX ARC, Nexus 2, Calibra, and RelyX Unicem)

  • After 150 days of storage in water and subsequent thermal cycling (37,500X), bond strength was significant lower (6.1 ± 2.7 MPa) than after 150 days of storage in water alone (7.5 ± 2.3 MPa) (p<0.0001)

  • Failure modes were completely adhesive between the cement-bonding substrate interface

Fig 2: Mean bond strengths of luting cements to high-gold-content alloy (Portadur P4), pre-treated with 100 µm Al2O3

Conclusion

  • The resin cement Panavia F and the self-adhesive universal resin cement RelyX Unicem yielded the highest bond values to high-gold-content alloy over time and after artificial aging
  • These cements may be more suitable for the application examined in this in-vitro study

Bibliography

  1. Cobb DS, Vargas MA, Fridrich TA, Bouschlicher MR. Metal surface treatment: characterization and effect on composite-to-metal bond strength. Oper Dent 2000;25:427-33.
  2. Mojon P, Hawbolt EB, MacEntee MI, Ma PH. Early bond strength of cementing agents to a precious alloy. J Dent Res 1992;71:1633-9.

This Poster was submitted by Dr. med. dent. Andree Piwowarczyk.

Correspondence address:
Dr. med. dent. Andree Piwowarczyk
Department of Prosthodontics
School of Dentistry
ZZMK (Carolinum)
J. W. Goethe University
Theodor-Stern-Kai 7
D-60590 Frankfurt
Germany