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Retentive properties of misaligned post attachment sleeves
B I Cohen1, A S Deutsch, B L Musikant
1Essential Dental Laboratories, South Hackensack, N.J.
The Journal of Prosthetic Dentistry
|February 1, 1992
Summary
Dental post and attachment sleeve retention was tested. Malalignment did not reduce retention, and a slight offset even increased it, offering dentists a greater safety factor with this cast post system.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Biomaterials Engineering
Background:
- Dental posts and attachment sleeves are crucial for retaining dental prostheses.
- Understanding the impact of alignment on their retention is vital for clinical success.
- Previous research has not fully explored the effect of specific malalignments on retention forces.
Purpose of the Study:
- To determine the retention capacity of different sized attachment sleeves.
- To evaluate how various alignments with corresponding post heads affect sleeve retention.
- To assess the clinical implications of malalignment on the safety factor of cast post systems.
Main Methods:
- Six experimental groups were established, with sample sizes ranging from 8 to 10.
- Attachment sleeves were cemented in varying alignments with cast post heads.
- Retention forces were measured in pounds using a universal testing machine.
Main Results:
- Malalignment between the sleeve and post head did not result in a loss of retention compared to the control group.
- A 0.26 mm offset in alignment significantly increased retention for sleeves attached to No. 2 and No. 3 cast post heads.
- These findings indicate a statistically significant improvement in retention with a specific offset.
Conclusions:
- The tested cast post system demonstrates robust retention even with sleeve-post malalignment.
- A controlled offset of 0.26 mm can enhance the retention of attachment sleeves.
- This system provides an increased safety factor for dentists during prosthetic restorations.