engleski

Study of trueness in CAD/CAM complete dentures

Aim: to compare the trueness of 3D printed versus milled complete denture bases. Materials and methods: study used frasaco (Tettnang, Germany) edentulous model of the upper jaw which was duplicated using silicone duplicating material. Eight casts were poured with type 3 dental stone. Every cast was scanned using laboratory scanner, and on that digitalized cast in appropriate software was modeled denture base with same thickness of 3 mm everywhere. Modeled denture bases were exported as STL files. From the same STL file was denture base 3D printed (IMPRIMO® LC Denture, Scheu Dental) and also milled (IvoBase CAD, Ivoclar Vivadent) according to manufacturer’s instructions. The intaglio surface of 3D printed and milled denture bases (16 completely) were scanned with laboratory scanner. The obtained STL file od 3D printed and milled denture base was aligned with reference STL file from which denture bases were made. Deviation values between intaglio surfaces were recorded – highest values of deviation (plus and minus values) and deviation label sigma (SD of deviation values for all inspected points of mesh). Comparison was made in GOM Inspect software (GOM metrology). Independent samples T test was applied. Results: Mean value of highest minus deviation values for milled denture bases was - 0, 10 and -0, 63mm for 3D printed. Mean value of highest plus deviation values was 0, 23 for milled denture bases and 0, 47mm for 3D printed. Mean value of deviation label sigma for milled dentures was 0, 04 and 0, 14mm for 3D printed. Independent samples T test showed differences between 3D printed and milled dentures for highest minus values (p=0, 002) and deviation label sigma (p=0, 010), while in highest plus values were not proved differences (p=0, 331). Conclusions: Milled dentures show better trueness compared to 3D printed. Clinical confirmation of findings is needed.

complete denture ; CAD-CAM

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