IADR Abstract Archives

Occlusal Surface Accuracy of Complete Dentures Fabricated With CAD/CAM Technology

Objectives: This study was to compare the reproducibility of the occlusal surface and dimensional accuracy of complete dentures fabricated with different digital fabricated techniques.
Methods: Two maxillary and mandibular edentulous models (Nissin)were mounted on an articulator (Stratos 200)based upon average values. The models and wax rims were then scanned by optical scanner (3Shape E3) and designed with software (Exocad DentalCAD). The complete dentures were fabricated by milled technique (CORITEC 250i) and 3D printing technique (NextDent). Additionally, the 3D printing group was divided into 4 sub-groups according to printing angles (45 and 90 degrees) and post-curing modifications (post curing on cast or not). The dimensional accuracy was evaluated by: 1) intercanine width 2) intermolar width 3) anteroposterior plane 4) Vertical plane. All the specimens were scanned, and the intaglio and cameo surfaces of each specimen was superimposed with the corresponding pre- processing cast using surface matching software (Geomagic Control 2014) at 40 selected points.
Results: In both arches, the milled group had the least deviation on reference areas. Meanwhile, the 3D printing group showed larger deviation than the milled group. According to digital superimposition, the overall results showed the significant difference in the accuracy and reproducibilityof the occlusal surface between milled and 3D printing groups. In the 3D printing groups, printing angle at 90 degrees and post cured on the cast showed the greater accuracy.
Conclusions: Within the limitation of the study:
The milled denture process presented with higher dimensional accuracy and occlusal reproducibility.
For 3D printing technique, the building orientation affected the dimensional accuracy.
Post-processing with curing on the cast improves the adaptation of tissue surface of the denture and presented less distortion on occlusal surface

Supported by STSP EX-03-17-29-108

2020 South East Asia Division Meeting (Virtual)

2020
P013
Prosthodontics Research
  • Tsai, Fu-chuan  ( National Taiwan University , Taipei , Taiwan )
  • Yang, Tsung-chieh  ( National Taiwan University , Taipei , Taiwan )
  • Lin, Li-deh  ( National Taiwan University , Taipei , Taiwan )
  • Supported by STSP EX-03-17-29-108
    Supported by STSP EX-03-17-29-108
    Poster Session
    Poster 1
    Thursday, 11/26/2020 , 02:30PM - 03:00PM