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KMID : 1023820150070010032
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The Journal of Advanced Prosthodontics
2015 Volume.7 No. 1 p.32 ~ p.38
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The influence of saliva pH value on the retention and durability of bar-clip attachments
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Antonio Sergio Silva
Carlos Aroso
Raul Ustrell
Ana Cristina Braga
Jose Manuel Mendes
Tomas Escuin
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Abstract
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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.
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KEYWORD
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Dental implants, Edentulous patients, Overdentures, Attachments, Corrosion
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