Marginal accuracy of titanium copings fabricated by casting and CAD/CAM techniques

Vertical marginal gap & retention of ceramic full coverage & inlay retained ceramic fixed partial dentures

“…The obtained vertical marginal gap data in the present study ranged from 47 to 59 μm are within the clinical acceptable values, since the criteria of 100 μm was considered by some authors as the maximum clinical acceptable marginal gap [24][25][26][27].…”

“…The large gap may cause cement solubility and result in plaque accumulation, marginal leakage, second caries, and eventually crown failure [62,63]. The clinically acceptable marginal gap for CAD/CAM generated restorations are within 100 μm [24][25][26][27]. Debonding of all-ceramic fixed restorations was common in-vivo studies [50,51].…”

“…The results also showed no difference between the premolar and the molar retainer for the same FPDs design. The range of the obtained vertical marginal gap varied from 47 to 59 μm, which is the range of the clinical acceptability [24][25][26][27].…”

“…Other author defined clinical acceptable marginal opening after cementation to be smaller than 150 μm [23]. For CAD/CAM generated restorations, the generally acceptable marginal gap discrepancies are between 50 and 100 μm [24][25][26][27]. Tinschert et al (2001) [28] reported mean marginal discrepancies between 61 μm and 74 μm for ZrO 2 ceramic FDP frameworks.…”

Effect of the use of die spacer on the marginal fit of copings cast in NiCr, NiCrBe and commercially pure titanium

“…One of the critical factors associated to crown fabrication is fidelity to the cast copy, which must correctly reproduce tooth preparation (6)(7)(8). According to some authors (3,9), copings cast in commercially pure titanium (cpTi) have shown appropriate marginal fit.…”