Shengbang Four Seasons
Apr 17,2026
Operational Procedures and Key Quality Control Points for Dental Plaster
The process of transforming dental plaster from powder into a usable model involves multiple steps.
The process of transforming dental plaster from powder into a usable model involves multiple steps. The handling methods used at each stage affect the accuracy of the final model and its clinical performance. Standardized operating procedures and effective quality control are prerequisites for the success of dental restorations.
I. Casting Procedure: The Initial Transformation from Impression to Model
Pouring is the process of pouring the mixed plaster slurry into the impression. This step directly determines the integrity and level of detail of the model:
Timing of pouring: The plaster slurry should be poured into the impression as soon as possible after mixing to prevent the slurry from thickening, which could affect its flowability and ability to reproduce details.
Pouring technique: Begin pouring slowly from the lowest part of the impression to allow the plaster slurry to flow naturally and expel air, thereby minimizing air bubbles. Vibration may be used to assist the flow of the slurry, but the amplitude should not be too high to prevent deformation of the impression.
Thickness Control: The thickness of the base must meet the overall strength requirements of the model; if too thin, it is prone to fracture, while if too thick, it wastes material and prolongs the setting time.
Edge Protection: During pouring, ensure that the edge areas of the impression are fully covered without gaps to guarantee the integrity of the working model’s edges.
II. Demolding and Finishing: Follow-up Processes After Model Formation
Once the plaster has fully set, the model must be removed from the impression and trimmed and shaped:
Timing of removal: Wait until the plaster has fully set and reached sufficient strength before removing the model; removing it too early may cause damage or surface scratches.
Direction of removal: Carefully separate the model along the direction of removal indicated on the impression; avoid forcing it out, as this may cause deformation or breakage.
Model Trimming: Use a model trimmer or specialized tools to smooth and trim the model base, ensuring uniform thickness and a stable foundation.
Marking: Mark key information on the model, such as the margins of the restoration and the boundaries of the tooth preparation, to facilitate subsequent fabrication.
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