J Adv Prosthodont.  2015 Jun;7(3):207-213. 10.4047/jap.2015.7.3.207.

Effect of cement washout on loosening of abutment screws and vice versa in screw- and cement- retained implant-supported dental prosthesis

• Kim SG
• Chung CH
• Son MK

• KMID: 2284706
• DOI: http://doi.org/10.4047/jap.2015.7.3.207

Abstract

PURPOSE
The purpose of this study was to examine the abutment screw stability of screw- and cement-retained implant-supported dental prosthesis (SCP) after simulated cement washout as well as the stability of SCP cements after complete loosening of abutment screws.
MATERIALS AND METHODS
Thirty-six titanium CAD/CAM-made implant prostheses were fabricated on two implants placed in the resin models. Each prosthesis is a two-unit SCP: one screw-retained and the other cemented. After evaluating the passive fit of each prosthesis, all implant prostheses were randomly divided into 3 groups: screwed and cemented SCP (Control), screwed and noncemented SCP (Group 1), unscrewed and cemented SCP (Group 2). Each prosthesis in Control and Group 1 was screwed and/or cemented, and the preloading reverse torque value (RTV) was evaluated. SCP in Group 2 was screwed and cemented, and then unscrewed (RTV=0) after the cement was set. After cyclic loading was applied, the postloading RTV was measured. RTV loss and decementation ratios were calculated for statistical analysis.
RESULTS
There was no significant difference in RTV loss ratio between Control and Group 1 (P=.16). No decemented prosthesis was found among Control and Group 2.
CONCLUSION
Within the limits of this in vitro study, the stabilities of SCP abutment screws and cement were not significantly changed after simulated cement washout or screw loosening.

Keyword

Implant-supported dental prosthesis; Torque; Dental cement

MeSH Terms

Dental Cements
Dental Prosthesis, Implant-Supported*
Prostheses and Implants
Titanium
Torque
Dental Cements
Titanium

Figure

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  Fig. 1 Esthetic abutment connected to implant A in the implant-resin block.

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  Fig. 2 Screw- and cement-retained implant prosthesis (SCP).

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  Fig. 3 SCP with a loading dimple on 45° slope.

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  Fig. 4 SCP specimens on the cyclic loading assembly connected to Instron machine.

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  Fig. 5 Views of the margin area of Esthetic abutments after cyclic loading (Not magnified: (A) Group 1 before loading, (B) Group 1 after loading, and (C) Control after loading). The arrows in (B) indicate an indentation mark and in (C) lack of cement around the margin areas of Esthetic abutments.

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