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Quintessence Publishing: Journals: IJP
The International Journal of Prosthodontics

Edited by George A. Zarb, BChD, DDS, MS, MS, FRCD(C)

ISSN 0893-2174

Publication:
July/August 2000
Volume 13 , Issue 4

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One-Piece Castings in Fixed Prosthodontics: A Study of Marginal Adaptation Using Computerized SEM Images

Gaetano Calesini, MD, DDS/Giovanni Battista Bruschi, MD, DDS/Agostino Scipioni, MD, DDS/Costanza Micarelli, DDS/Antonello Di Felice, CDT

Pages: 275-281
PMID: 11203642

Purpose: To determine if the typical mechanical resistance of one-piece castings can be maintained with an elevated level of marginal precision, the authors evaluated 10 consecutive castings obtained using their normal laboratory techniques for one-piece castings. Materials and Methods: For the evaluation of the marginal precision of the castings, a new method that uses a scanning electronic microscope (SEM) integrated with a computerized measuring system was developed. This method proved to be precise and reliable. A total of 3,564 measurements at 3003 was made of the vertical marginal openings of 10 castings structured with 3 abutments and 2 pontics (casting length 43 mm, mean weight 10.4 g). Results: The mean of such measurements of the marginal openings was 22 Ám, although if 2 castings that were judged to be clinically unsuitable when produced are excluded, the abovementioned average is 16 Ám. Conclusion: The proposed casting technique can offer one-piece castings of higher quality, with a level of precision that introduces a new reference standard in the marginal accuracy of these castings in fixed prostheses.

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