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Loosening torque of Universal Abutment screws after cyclic loading: influence of tightening technique and screw coating.

Bacchi A, Regalin A, Bhering CL, Alessandretti R, Spazzin AO - J Adv Prosthodont (2015)

Bottom Line: The tightening technique did not show significant influence on the loosening torque of screws (P=.509).Conventional titanium screws showed significant higher loosening torque values than DLC (P=.000).The use of conventional titanium screw is more important than the tightening techniques employed in this study to provide long-term stability to Universal Abutment screws.

View Article: PubMed Central - PubMed

Affiliation: Meridional Faculty - IMED, School of Dentistry, Prosthodontics and Dental Materials, Brazil.

ABSTRACT

Purpose: The purpose of this study was to evaluate the influence of tightening technique and the screw coating on the loosening torque of screws used for Universal Abutment fixation after cyclic loading.

Materials and methods: Forty implants (Titamax Ti Cortical, HE, Neodent) (n=10) were submerged in acrylic resin and four tightening techniques for Universal Abutment fixation were evaluated: A - torque with 32 Ncm (control); B - torque with 32 Ncm holding the torque meter for 20 seconds; C - torque with 32 Ncm and retorque after 10 minutes; D - torque (32 Ncm) holding the torque meter for 20 seconds and retorque after 10 minutes as initially. Samples were divided into subgroups according to the screw used: conventional titanium screw or diamond like carbon-coated (DLC) screw. Metallic crowns were fabricated for each abutment. Samples were submitted to cyclic loading at 10(6) cycles and 130 N of force. Data were analyzed by two-way ANOVA and Tukey's test (5%).

Results: The tightening technique did not show significant influence on the loosening torque of screws (P=.509). Conventional titanium screws showed significant higher loosening torque values than DLC (P=.000).

Conclusion: The use of conventional titanium screw is more important than the tightening techniques employed in this study to provide long-term stability to Universal Abutment screws.

No MeSH data available.


Samples under mechanical loading cycles.
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Figure 1: Samples under mechanical loading cycles.

Mentions: A digital torque meter with precision of 0.1-Ncm (TQ8800; Lutron, Taipei, Taiwan) was used to tighten the screws and evaluate the loosening torque after mechanical loading cycles. The cyclic loading was performed using the MSCM equipment (ME Instrument, São Carlos, Brazil) which has a stainless steel tip of 4 mm in diameter in contact with the central part of the metallic crowns. Samples were submitted to 106 mechanical cycles under a load of 130 N, at a rate of 2 Hz (Fig. 1).10 All procedures in the study were performed by the same operator. Data for each group were recorded and statistical analyze was carried out by two-way ANOVA (screw type vs tightening technique) and multiple comparison evaluated by Tukey's test with 5% significance level.


Loosening torque of Universal Abutment screws after cyclic loading: influence of tightening technique and screw coating.

Bacchi A, Regalin A, Bhering CL, Alessandretti R, Spazzin AO - J Adv Prosthodont (2015)

Samples under mechanical loading cycles.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4644778&req=5

Figure 1: Samples under mechanical loading cycles.
Mentions: A digital torque meter with precision of 0.1-Ncm (TQ8800; Lutron, Taipei, Taiwan) was used to tighten the screws and evaluate the loosening torque after mechanical loading cycles. The cyclic loading was performed using the MSCM equipment (ME Instrument, São Carlos, Brazil) which has a stainless steel tip of 4 mm in diameter in contact with the central part of the metallic crowns. Samples were submitted to 106 mechanical cycles under a load of 130 N, at a rate of 2 Hz (Fig. 1).10 All procedures in the study were performed by the same operator. Data for each group were recorded and statistical analyze was carried out by two-way ANOVA (screw type vs tightening technique) and multiple comparison evaluated by Tukey's test with 5% significance level.

Bottom Line: The tightening technique did not show significant influence on the loosening torque of screws (P=.509).Conventional titanium screws showed significant higher loosening torque values than DLC (P=.000).The use of conventional titanium screw is more important than the tightening techniques employed in this study to provide long-term stability to Universal Abutment screws.

View Article: PubMed Central - PubMed

Affiliation: Meridional Faculty - IMED, School of Dentistry, Prosthodontics and Dental Materials, Brazil.

ABSTRACT

Purpose: The purpose of this study was to evaluate the influence of tightening technique and the screw coating on the loosening torque of screws used for Universal Abutment fixation after cyclic loading.

Materials and methods: Forty implants (Titamax Ti Cortical, HE, Neodent) (n=10) were submerged in acrylic resin and four tightening techniques for Universal Abutment fixation were evaluated: A - torque with 32 Ncm (control); B - torque with 32 Ncm holding the torque meter for 20 seconds; C - torque with 32 Ncm and retorque after 10 minutes; D - torque (32 Ncm) holding the torque meter for 20 seconds and retorque after 10 minutes as initially. Samples were divided into subgroups according to the screw used: conventional titanium screw or diamond like carbon-coated (DLC) screw. Metallic crowns were fabricated for each abutment. Samples were submitted to cyclic loading at 10(6) cycles and 130 N of force. Data were analyzed by two-way ANOVA and Tukey's test (5%).

Results: The tightening technique did not show significant influence on the loosening torque of screws (P=.509). Conventional titanium screws showed significant higher loosening torque values than DLC (P=.000).

Conclusion: The use of conventional titanium screw is more important than the tightening techniques employed in this study to provide long-term stability to Universal Abutment screws.

No MeSH data available.