Accuracy of 3D-Printed Occlusal Devices of Different Volumes Using a Digital Light Processing Printer

Abstract

(1) Background: This in-vitro study was designed to investigate the accuracy of CAD/CAM fabricated occlusal devices with different heights and volumes. (2) Methods: Based on an intraoral scan, an occlusal device with a vertical bite elevation of 2.5 mm and 4.5 mm was digitally designed and 3D printed 10 times. The fabricated occlusal devices were digitized by an industrial structured light scanner (ILS) and provided in stl-format as test objects. The test objects were superimposed with the design dataset as reference to evaluate the accuracy of complete surfaces ([2.5_TOTAL] and [4.5_TOTAL]) with respect to their internal surfaces ([2.5_INTERNAL] and [4.5_INTERNAL]). The mean trueness and precision were calculated based on absolute mean deviation. Absolute and relative volume differences between reference and test were computed. Statistical significances were analyzed performing the Wilcoxon test (α =0.05). (3) Results: As absolute mean deviation trueness values were obtained: 59 ± 5 µm for [2.5_INTERNAL], 98 ± 9 µm for [4.5_INTERNAL], 68 ± 1 µm for [2.5_TOTAL] and 90 ± 10 µm for [4.5_TOTAL]. The precision applying absolute mean deviation was 14 ± 8 µm for [2.5_INTERNAL], 22 ± 11 µm for [4.5_INTERNAL], 19 ± 10 µm for [2.5_TOTAL] and 26 ± 13 µm for [4.5_TOTAL]. The mean trueness and precision values differed significantly. Volume differences of 2.11% for [4.5_TOTAL] and of 2.35% for [2.5_TOTAL] in comparison to their reference file were evaluated. (4) Conclusions: Printed occlusal devices with minor height and volume were more accurate. Both types of devices exhibited results that were comparable to the literature.

Comparação Entre Placas Estabilizadoras Produzidas Por Impressão 3d E O Método Convencional: Uma Revisão Integrativa De Literatura

“…Dois examinadores procederam a extração dos dados e, um terceiro pesquisador revisou e corrigiu, quando necessário, os dados coletados. Dezesseis publicações científicas 2,4,6,[8][9][10][11][12][13][14][15][16][17][18][19][20][21] que correlacionam a impressão 3D e placas oclusais foram selecionadas para análise qualitativa. O fluxograma apresentado na Figura 1 aborda as etapas do processo de eleição dos artigos.…”

“…O fluxograma apresentado na Figura 1 aborda as etapas do processo de eleição dos artigos. Na análise dos artigos incluídos identificou-se que consistiam em duas revisões de literatura sobre as placas CAD/CAM 6,8 , cinco estudos clínicos comparando as placas impressas com as convencionais 11,12,13,14,15 e nove estudos in vitro que comparam as características mecânicas e de biocompatibilidade das placas 2,4,9,10,[16][17][18][19][20][21] .…”

Study of Forming Performance and Characterization of DLP 3D Printed Parts

“…It can print and solidify a single layer of liquid resin in just a few seconds, thus printing sample models faster with a higher processing accuracy [ 12 ]. Therefore, it is often applied in the fields of dentistry [ 13 ] and jewelry [ 14 ].…”

Accuracy and precession of 3d printed cast produced by two printing techniques

“…Envision TEC considers the approved tolerance +/-42 μm in the XY axis and it is consistent to what is reported in literature. [5] The surface finish considers how smooth the cast is established based on the thickness of layers in the z-axis. The XYZ axis determines Voxel size.…”