Precision of fit of two margin designs for metal-ceramic crowns: Basic science research

Penwadee Limkangwalmongkol, Gerard Jules Chiche, Markus B. Blatz

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)233-237
Number of pages5
JournalJournal of Prosthodontics
Volume16
Issue number4
DOIs
StatePublished - Jul 1 2007

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Dental Porcelain
Ceramics
Feathers
Crowns
Metals
Research
Cheek
Tongue
Tooth
Metal Ceramic Alloys
Bicuspid
Control Groups

Keywords

  • Fit
  • Margins
  • Metal-ceramic

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Precision of fit of two margin designs for metal-ceramic crowns : Basic science research. / Limkangwalmongkol, Penwadee; Chiche, Gerard Jules; Blatz, Markus B.

In: Journal of Prosthodontics, Vol. 16, No. 4, 01.07.2007, p. 233-237.

Research output: Contribution to journalArticle

Limkangwalmongkol, Penwadee ; Chiche, Gerard Jules ; Blatz, Markus B. / Precision of fit of two margin designs for metal-ceramic crowns : Basic science research. In: Journal of Prosthodontics. 2007 ; Vol. 16, No. 4. pp. 233-237.
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