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Internal and marginal adaptation of 3D printed interim fixed partial dentures with different layer thicknesses
Fateme Ghorbanpour Arani1, Mahya Hasanzade2, Negin Aminianpour3
1School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
Purpose:
The aim of this study was to compare the marginal and internal adaptation of polymethyl methacrylate interim fixed partial denture (FPD) restorations fabricated by three-dimensional (3D) printing with different layer thicknesses.
Materials And Methods:
A standard typodont was scanned by a laboratory scanner. The maxillary left first premolar and first molar teeth received an all-ceramic full-coverage crown preparation, and the second premolar was removed to create a pontic space. The prepared teeth were then scanned, and metal dies were fabricated by a milling machine. Restorations were designed and fabricated in 3 groups (n = 12 in inch) with 25, 50 and 100 µm layer thicknesses. The marginal and internal gaps were measured by the replica technique. Data were analyzed by one-way ANOVA (α = 0.05).
Results:
The mean gap size (MGS) in the cervical area of premolar restorations was significantly higher in 100 µm than in 50 and 25 µm thicknesses (P < .05). The MGS in the marginal area of premolar restorations was significantly higher in 100 µm thickness than in 50 µm thickness (P < .05), with no statistically significant difference with 25 µm thickness (P > .05). The MGS at the occlusal and cervical areas of the molar restorations was significantly higher in 100 µm thickness than in 50 µm thickness (P < .05), with no statistically significant difference with 25 µm thickness (P > .05).
Conclusion:
Different thicknesses of additive layers in 3D printing affected the marginal and internal gaps. The smallest gap size was recorded in 50 µm layer thickness.
