TY - JOUR
AU - Blatz, Markus B.
AB - Statement of Problem: Although metal‐ceramic restorations are widely used, there is a lack of information about how the fit is affected by margin designs. Purpose: This study measured and compared the precision of fit of metal‐ceramic crowns with two margin designs. Material and Methods: Thirty‐two extracted human premolar teeth were prepared for complete‐coverage restorations with an internally rounded shoulder preparation. Impressions were made from all teeth, and master dies were poured with improved stone type V. MC crowns were fabricated with a porcelain‐butt margin on the buccal aspect (n = 32) and a feather‐edge metal margin on the lingual aspect (n = 32), which served as a control group. Precision of fit was measured three times at the mid‐buccal and mid‐lingual margins of each crown with a profilometer. The data were statistically analyzed with the paired t‐test (α < .05). Results: Mean marginal gap size of porcelain‐butt margins was 27.93 μm (±15.84) and of feather‐edge metal margins 42.43 μm (±24.12). The marginal gap size of feather‐edge metal margins was statistically significantly greater than that of porcelain‐butt margins (p = 0.0045). Conclusion: The marginal fit of porcelain‐butt margins was significantly better than that of feather‐edge metal margins. Clinical Implications : Porcelain‐butt margins in this study had a better marginal fit than feather‐edge metal margins, and thus have given clinicians evidence to prefer the use of porcelain‐butt margins.
TI - Precision of Fit of Two Margin Designs for Metal‐Ceramic Crowns
JF - Journal of Prosthodontics
DO - 10.1111/j.1532-849X.2007.00186.x
DA - 2007-07-01
UR - https://www.deepdyve.com/lp/wiley/precision-of-fit-of-two-margin-designs-for-metal-ceramic-crowns-FvV10H73zn
SP - 233
VL - 16
IS - 4
DP - DeepDyve
ER -