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. 2022 Jul 7;15(14):4774.
doi: 10.3390/ma15144774.

Effect of Different Wax Pattern Manufacturing Techniques on the Marginal Fit of Lithium Disilicate Crowns

Huda Ahmed Alshehri  1 , Sara Mohammed Altaweel  1 , Raghdah Alshaibani  1 , Esraa Ahmed Alahmari  1 , Hanan Nejer Alotaibi  1 , Afnan Fouzan Alfouzan  1 , Nawaf Labban  1
Affiliations

Effect of Different Wax Pattern Manufacturing Techniques on the Marginal Fit of Lithium Disilicate Crowns

Huda Ahmed Alshehri et al. Materials (Basel). .

Abstract

Purpose: The present study evaluated the marginal gap of lithium disilicate crowns fabricated through three different wax pattern techniques; Conventional, Milling and 3D-printing. Materials and Methods: Thirty stone models were replicated from a stainless-steel model representing a prepared tooth; ten were sent to make conventional wax patterns while the remaining were sent to a digital dental scanner. The computer aided design was completed and STL (Standard Tessellation Language) files were sent to either milling or 3D-printing machines. All wax patterns (n = 30) were pressed, and a stabilizing instrument was used to secure the crowns on the master model. The marginal gap was measured at 18 points for each crown using a digital microscope (µm) (n = 540) and compared using One-way ANOVA (p ≤ 0.05). Results: There was a significant difference in the marginal gap value between all three groups (p < 0.01) where the milled group showed the least mean gap (28.87 ± 30.18 µm), followed by 3D printed (47.85 ± 27.44 µm), while the highest mean marginal gap was found in the conventional group (63.49 ± 28.05 µm). Conclusion: Milled and 3D-printed wax patterns produced better fitting crowns compared to conventional techniques.

Keywords: 3D-printing; Cad/CAM; ceramic crown; lithium disilicate; marginal fit; wax pattern.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Master model.
Figure 2
Figure 2
Impression and stone model.
Figure 3
Figure 3
Three different types of wax patterns; conventional (a), Milled (b) and 3D-printed (c).
Figure 4
Figure 4
CAD model.
Figure 5
Figure 5
The stabilizing instrument.
See this image and copyright information in PMC

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