PubMed · 6963197
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J M Linarès. 1982-10-21. [Something new for decementation].. https://pubmed.ncbi.nlm.nih.gov/6963197/
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STATEMENT OF PROBLEM: One common test of single-unit restorations involves applying loads to clinically realistic specimens through spherical indenters, or equivalently, loading curved incisal edges against flat compression platens. As knowledge has become available regarding clinical failure mechanisms and the behavior of in vitro tests, it is possible to constructively question the clinical validity of such failure testing and to move toward developing more relevant test methods. PURPOSE: This article reviewed characteristics of the traditional load-to-failure test, contrasted these with characteristics of clinical failure for all-ceramic restorations, and sought to explain the discrepancies. Literature regarding intraoral conditions was reviewed to develop an understanding of how laboratory testing could be revised. Variables considered to be important in simulating clinical conditions were described, along with their recent laboratory evaluation. CONCLUSIONS: Traditional fracture tests of single unit all-ceramic prostheses are inappropriate, because they do not create failure mechanisms seen in retrieved clinical specimens. Validated tests are needed to elucidate the role(s) that cement systems, bonding, occlusion, and even metal copings play in the success of fixed prostheses and to make meaningful comparisons possible among novel ceramic and metal substructures. Research over the past 6 years has shown that crack systems mimicking clinical failure can be produced in all-ceramic restorations under appropriate conditions.
This article presents a procedure for refining margins of provisional implant crowns. This procedure uses an analog of the implant and abutment. This procedure allows functional and esthetic considerations such as emergence profiles, symmetry, diastemas, embrasures, size, contours, position, angulation, and relation to other teeth to be evaluated.
A technique for facilitating cement removal between splinted crowns is described. The technique involves tying dental floss with the large-diameter yarn portion around the embrasure of the splinted crown before cementing, and pulling it through before the cement has reached a final set. This simple, quick technique achieves removal of cement without damage to the interproximal crown surface.