From alginate impressions to digital virtual models: accuracy and reproducibility

Area of Science:

• Orthodontics
• Dental Technology

Background:

• Accurate dental measurements are crucial for orthodontic diagnosis and treatment planning.
• Traditional methods involve plaster casts, which can be affected by time and shipping.
• Digital virtual models offer a potential alternative for precise measurements.

Purpose of the Study:

• To compare the accuracy and reproducibility of measurements from digital virtual models versus plaster casts.
• To evaluate the impact of shipping alginate impressions on plaster cast accuracy.

Main Methods:

• Three sets of alginate impressions were taken from 12 participants.
• Plaster models were poured immediately or after 3-5 days of shipping.
• Digital models were created from plaster models for virtual measurements.
• Measurements were taken using digital calipers on plaster casts and virtual tools on digital models.

Main Results:

• No statistical differences in accuracy were found between plaster models poured immediately or after shipping.
• Measurements on digital virtual models showed significantly smaller intra- and inter-observer variability.
• Digital models demonstrated superior reproducibility compared to traditional plaster casts.

Conclusions:

• Shipping alginate impressions does not compromise the accuracy of subsequent plaster casts.
• Virtual measurements on digital models provide more reproducible results than caliper measurements on plaster casts.
• Digital models represent a reliable and accurate tool for orthodontic measurements.