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Published on: July 21, 2014
Additively Versus Subtractively Manufactured Endocrowns: Fit, Trueness, and Retention of Zirconia, Resin Composite,
Purpose:
This study evaluated the marginal and internal adaptation, fabrication trueness, and retention of endocrowns made from additively manufactured (AM) glass-filler-reinforced resin composite and zirconia, and subtractively manufactured (SM) advanced lithium disilicate (ALD).
Materials And Methods:
A resin typodont model was scanned to design endocrowns. Sixty restorations (n=20/group) were fabricated using AM composite (Group C), AM zirconia (Group ZrO2), or SM lithium disilicate (Group ALD). All restorations were scanned with the same intraoral scanner; adaptation (marginal and internal gaps) was quantified with cross-sectional measurements, and trueness was analyzed as RMS deviations. Endocrowns were cemented on resin dies, thermomechanically aged, and tested for pull-out forces. One-way ANOVA (α = .05) was used for statistical analysis.
Results:
ALD showed the lowest marginal (30.81 ±2.45 μm) and internal (33.41 ±2.62 μm) discrepancies, followed by ZrO2 (40.45 ±2.80 μm; 46.23 ±2.20 μm), and C (63.92 ±4.30 μm; 60.34 ±3.30 μm). Significant differences were observed between C and ALD (p=.003; p=.009) and between C and ZrO2 (p=.007; p=.012), but not between ALD and ZrO2 (p=.386; p=.115). Trueness was highest in ALD (38.72 ±3.91 μm), followed by ZrO2 (43.55 ±4.16 μm) and C (51.08 ±4.84 μm), with significant differences between ALD and C (p<.001) and ZrO2 and C (p=.004). ZrO2 showed the highest retention (754 ±211 N), significantly greater than ALD (709 ±208 N; p=.014) and C (634 ± 363 N; p=.002).
Conclusions:
ALD and ZrO2 endocrowns showed superior adaptation and trueness compared to AM composite. ZrO2 exhibited the highest retention. Within the study's limitations, AM-zirconia appears to be a viable alternative to SM lithium disilicate for endocrown fabrication.
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