الفهرس 
Review of LiteratureOnly 14 pages are availabe for public view
 |  | from | 16 |  |  |
| | | from | 16 | | |
Abstract
The longevity of fixed prosthesis depends on retention and marginal integrity of restorations.
Optimal retention is one of the main requirements for successful restoration when minimal amount f
tooth structure is left. This led to the development of new luting cements such as adhesive resin
based cement, modified glass- onomer luting cement, which were claimed to possess higher bonding
potentials to dentin. (1)
The cementation of artificial crown is commonly accompanied by sensitivity, so the clinical
application of desensitizing agents has become prevalent.(2) However it was reported that the
use of desensitizing agents affects the bonding between dentin and luting material. Durable bonding
between dentin and luting materials in such cases is one of the most important factors for avoiding
detachment of restorations as well as the prevention of microleakage, secondary dental caries and
tooth fracture. Some ngredients contained in dentin desensitizers may induce chemical nteraction
with dentin organic substances, and this may affect the sealing and bonding characteristics of the
luting agents. ( 3)
The retention of restorations can be compromised by short or over-tapered tooth preparations.(4)
Previous studies have primarily ocused on the mechanical analysis of the relationship between
degree of taper, surface area, surface roughness, preparation length, or luting agents on the force
necessary to remove cemented castings from machined dies.(5,6) The geometric form of the prepared
tooth and the prosthesis mainly determines the retention of the casting, but he clinical success of
the restoration also depends on the integrity and the mode of attachment of the intervening cement
layer
The purpose of this study was to test the effect of using two dentin desensitizers on the retentive
strength of cast copings cemented with different luting agents on teeth prepared with controlled
surface areas and high convergence angle.