Evaluating the effect of Die spacer on crown retention in fixed prosthesis
Crown retention is related to its adaptation with tooth while there is always a gap between the crown and prepared tooth. Although this gap is filled with cements but the mechanical retention between axial walls and internal surfaces is decreased. Therefore, what is the relation between die spacer...
| Main Authors: | , |
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| Format: | Article |
| Language: | fas |
| Published: |
Tehran University of Medical Sciences
1997-06-01
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| Series: | Journal of Dental Medicine |
| Online Access: | http://jdm.tums.ac.ir/browse.php?a_code=A-10-25-600&slc_lang=en&sid=1 |
| Summary: | Crown retention is related to its adaptation
with tooth while there is always a gap between the crown and prepared tooth.
Although this gap is filled with cements but the mechanical retention between
axial walls and internal surfaces is decreased. Therefore, what is the relation
between die spacer and crown retention? Does it affect retention? And if so,
what is the best thickness of it? It has been a long time that various
techniques are recommended and used to improve the adaptation of crowns.
According to Fusayama and based on some other researches, it can be concluded
that by using die spacer we can noticeably decrease the thickness of cement and
improve the adaptation of cement. In addition, many studies on thickness and
amount of die spacer concluded that by using die spacers, in %55 of cases crown
retention was increased while in 30% decreased and 10-15% have not changed.
Hence, it seems that using die spacer is generally beneficial and the best
thickness of it according to our research is 2-4 layers that can improve
retention by 41%.
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| ISSN: | 1024-641X 2008-2444 |