J Adv Prosthodont.  2013 Aug;5(3):234-240. 10.4047/jap.2013.5.3.234.

A comparison of retentive strength of implant cement depending on various methods of removing provisional cement from implant abutment

Affiliations
  • 1Department of Prosthodontics, College of Dentistry, Dankook University, Cheonan, Republic of Korea. syshin@dankook.ac.kr

Abstract

PURPOSE
This study evaluated the effectiveness of various methods for removing provisional cement from implant abutments, and what effect these methods have on the retention of prosthesis during the definitive cementation.
MATERIALS AND METHODS
Forty implant fixture analogues and abutments were embedded in resin blocks. Forty cast crowns were fabricated and divided into 4 groups each containing 10 implants. Group A was cemented directly with the definitive cement (Cem-Implant). The remainder were cemented with provisional cement (Temp-Bond NE), and classified according to the method for cleaning the abutments. Group B used a plastic curette and wet gauze, Group C used a rubber cup and pumice, and Group D used an airborne particle abrasion technique. The abutments were observed using a stereomicroscope after removing the provisional cement. The tensile bond strength was measured after the definitive cementation. Statistical analysis was performed using one-way analysis of variance test (alpha=.05).
RESULTS
Group B clearly showed provisional cement remaining, whereas the other groups showed almost no cement. Groups A and B showed a relatively smooth surface. More roughness was observed in Group C, and apparent roughness was noted in Group D. The tensile bond strength tests revealed Group D to have significantly the highest tensile bond strength followed in order by Groups C, A and B.
CONCLUSION
A plastic curette and wet gauze alone cannot effectively remove the residual provisional cement on the abutment. The definitive retention increased when the abutments were treated with rubber cup/pumice or airborne particle abraded to remove the provisional cement.

Keyword

Retentive strength; Implant cement; Provisional cement; Implant abutment

MeSH Terms

Cementation
Crowns
Prostheses and Implants
Retention (Psychology)
Rubber
Silicates
Rubber
Silicates

Figure

  • Fig. 1 Prefabricated implant abutment (A), implant fixture analogue (B), and prefabricated plastic coping (C) used in this study.

  • Fig. 2 Abutment and fixture analogue embedded in acrylic resin.

  • Fig. 3 Crown coping with a loop for retention testing.

  • Fig. 4 Specimen fixed to the universal testing machine (Instron 8871, Instron Co., Norwood, MA, USA) for tensile testing.

  • Fig. 5 Abutment surface in Group A (original magnification ×330).

  • Fig. 6 Abutment surface in Group B (original magnification ×330).

  • Fig. 7 Abutment surface in Group C (original magnification ×330).

  • Fig. 8 Abutment surface in Group A (original magnification ×330).

  • Fig. 9 Average tensile bond strength of each group (unit: N). Horizontal lines indicate significant differences (P<.05).


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