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41 - Effect of Polishing Technique on Flexural Strength of Glass-Ceramics

Maier, E. ; Gebler, P. ; Lammers, P. ; Belli, R. ; Lohbauer, U. ; Pelka, M.

Dental materials, 2022, Vol.38, p.e26-e26 [Periódico revisado por pares]

Elsevier Inc

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  • Título:
    41 - Effect of Polishing Technique on Flexural Strength of Glass-Ceramics
  • Autor: Maier, E. ; Gebler, P. ; Lammers, P. ; Belli, R. ; Lohbauer, U. ; Pelka, M.
  • É parte de: Dental materials, 2022, Vol.38, p.e26-e26
  • Descrição: Aim of the study was to evaluate the influence of polishing on the flexural strength of dental glass-ceramic materials performed according to chairside techniques, laboratorial procedures or glazed. Specimens were produced of two dental ceramics (IPS e.max CAD/IPS e.max Press, both Ivoclar Vivadent, Schaan, Liechtenstein) as bars of 4 ×3 x 25mm. Specimens were grinded wet with a rough diamond-copper wheel (D19) to standardize a rough surface (served as negative control, group 5). To simulate chairside conditions students of the 10th semester polished one side of the bars with either Diapro (two-step system, group 1) or Diapol (three-step system, group 2) (both from EVE Ernst Vetter GmbH, Keltern, Germany) dry with a KAVO handpiece. The positive control (group 3) was polished in laboratory with an automatic polishing machine (Buehler) with SiC papers up to 4000 grit under water-cooling. Group 4 was glazed (Crystal/Glaze Spray, Ivoclar) following manufacturers intructions. Afterwards all specimens were tested for flexural strength in a four-point-bending test. Stress at fracture was analyzed using Weibull statistics. The unpolished negative control group 5 showed the lowest mean flexural strength values for both materials. The chairside polishing groups (1/2) showed the highest mean flexural strength values. For e.max CAD those were significantly higher than in group 3 (lab polish), for e.max Press no significant difference between those groups could be found. Group 4 (glaze) reached similar mean flexural strength values to lab polishing (3) for e.max CAD; for e.max Press the values were significantly lower than in all polished groups (1-3). Polishing of dental ceramics increases flexural strength, independent if done dry chairside or in laboratory under water-cooling. Glazing can increase strength depending on material but is not more effective than polishing.
  • Editor: Elsevier Inc
  • Idioma: Inglês
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