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. 2015 Feb;7(1):32-8.
doi: 10.4047/jap.2015.7.1.32. Epub 2015 Feb 17.

The influence of saliva pH value on the retention and durability of bar-clip attachments

Antonio Sergio Silva  1 , Carlos Aroso  1 , Raul Ustrell  2 , Ana Cristina Braga  3 , Jose Manuel Mendes  1 , Tomas Escuin  4
Affiliations

The influence of saliva pH value on the retention and durability of bar-clip attachments

Antonio Sergio Silva et al. J Adv Prosthodont. 2015 Feb.

Abstract

Purpose: The aim of this study was to compare the durability and retention of 4 types of attachments placed over computer aided design/computer aided manufacturing (CAD/CAM) titanium bars when subjected to different pH conditions.

Materials and methods: Four commercially available attachments were investigated: Hader Yellow, Hader Red, Ackerman Gold and Ackerman Stainless Steel. These attachments and Ackerman CAD/CAM titanium bars were placed in 2 vessels containing different artificial saliva solutions (pH 7/pH 4) at 37℃ for one month to simulate corrosion conditions, and they were then subjected to mechanical testing (5400 cycles of insertion and removal).

Results: The results revealed that there were significant differences in the average values of insertion/removal force due to the pH (F (1, 24)=9.207, P<.05) and the type of attachment (F (3, 24)=11.742, P<.05).

Conclusion: More acidic pH values were found to have a negative influence on the retention capacity of the attachments.

Keywords: Attachments; Corrosion; Dental implants; Edentulous patients; Overdentures.

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Figures

Fig. 1
Fig. 1. CS- Dental Testing Machine® used in fatigue tests.
Fig. 2
Fig. 2. Insertion force averages for the different pH.
Fig. 3
Fig. 3. Insertion force averages for the different attachments.
Fig. 4
Fig. 4. Insertion force averages for the different attachments (pH7 and pH4).
Fig. 5
Fig. 5. Removal force averages for the different pH.
Fig. 6
Fig. 6. Removal force averages for the different attachments.
Fig. 7
Fig. 7. Removal force averages for the different attachments (pH 7 and pH 4).
Fig. 8
Fig. 8. Hader Red, (A) before and (B) after fatigue tests, with erosion zones on the Teflon (×90 magnification).
Fig. 9
Fig. 9. Ackerman Gold, (A) before and (B) after fatigue tests, with polished surface zones (×90 magnification).
Fig. 10
Fig. 10. Ackerman stainless steel, (A) before and (B) after fatigue tests, with retention loops showing significant wear (×90 magnification).
Fig. 11
Fig. 11. Titanium CAD/CAM bar, (A) before and (B) after fatigue tests, with enormous wear produced by an Ackerman stainless steel attachment (×90 magnification).
See this image and copyright information in PMC

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