The Subject of the Article:
Digital manufacturing has completely transformed orthodontics - but how reliable are 3D-printed models really? A new study by LMU Munich provides revealing answers concerning the dimensional stability of aligner models from the filament printer.
Digital models on the test bench
Although traditional plaster models are considered the gold standard, they are time-consuming, prone to breakage and not very flexible. With the advent of 3D printing technologies, one question has arisen: can printed models compete? The LMU study shows: Yes - under certain conditions even more than that.
The challenge: Precision despite thermoforming
Even after several thermoforming cycles, aligner models must remain dimensionally stable. However, the precision of many 3D-printed models decreases with each cycle - a risk for the aligners fitting accuracy and therefore for the treatment success.
The solution: SIMPLEX filament printing system
The study examined Renfert's SIMPLEX 3D filament printing system in combination with the SIMPLEX aligner model 2 model filament. The result: models with a high number of loops and special aligner foil showed significantly better dimensional stability - even after several thermoforming cycles.
Result:
- Comparable accuracy to plaster models
- Greater efficiency in everyday practice
- Less material wear thanks to more stable models
Quote from the study
“Models with a higher number of loops showed better stability, thus indicating a more robust structure.”
LMU Munich, study results on dimensional stability (download here the article of QUINTESSENZ magazin - German only)
Tips for getting started
- Start with test prints featuring different numbers of loops
- Compare different film types in everyday practice
- Document the results for internal quality control
Conclusion
- 3D-printed models can replace plaster models in terms of stability
- The choice of printing parameters and foil material is crucial
- The SIMPLEX system offers a reliable, digital solution for aligner production
