[Temporary repair--a blue print for the dental laboratory].
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A technique for making temporary restorations has been described. The temporary restoration is diagnostic, protective, and stabilizes prepared teeth.
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STATEMENT OF PROBLEM: Clinical changes in the viscoelasticity of temporary soft lining materials are characterized by a more rapid and increased reduction in compliance than is seen after in vitro immersion. A possible explanation for these differences is a solvent effect, acting clinically to encourage the loss of ethanol and plasticizer. Dietary solvents have been suggested as likely agents. PURPOSE: This study examined the effect of immersion in dietary simulating solvents on the viscoelasticity of temporary soft lining materials, with a view to formulating more clinically relevant immersion regimes used in the evaluation of these materials. MATERIAL AND METHODS: Four temporary soft lining materials were immersed in distilled water and solutions chosen to simulate dietary solvents. Changes in viscoelasticity over time were recorded with a penetrometer, modified to record creep strain and strain during recovery. RESULTS: All immersion solutions caused a significant reduction in compliance values of each material over time (P <.05). However, only heptane and corn oil immersants produced the rapid and increased reduction in compliance that is evident clinically. Changes in elastic recovery were less pronounced. CONCLUSION: Results of this study offer support to a dietary source of solvent acting to effect clinical changes in the viscoelasticity of temporary soft lining materials.
A procedure is presented that will eliminate the potential pulpal damage from exposure of freshly prepared dentin to uncured acrylic resin, reduce chair time, and produce an accurate temporary acrylic crown that requires minimal adjustment.
Self-curing resins are generally used to directly temporary prostheses on the crown abutments. This technique enables the operator to obtain a better marginal adaptation of the temporary prosthesis. The risk of such a procedure is the inflammation of the pulp due to the exothermic polymerization reaction of self-curing resins. The authors suggest experimentally evaluating the rate of thermic increase within the pulp cavity of an extracted tooth while directly relining a temporary crown.