J Dent Rehabil Appl Sci.  2015 Dec;31(4):316-328. 10.14368/jdras.2015.31.4.316.

Three dimensional accuracy analysis of dental stone casts fabricated using irreversible hydrocolloid impressions

Affiliations
  • 1Department of Prosthodontics, Daejeon Dental Hospital, Wonkwang University, Daejeon, Republic of Korea. dentist@empas.com

Abstract

PURPOSE
The objects of this study was to evaluate the accuracy of the dental stone casts made from alginate impressions according to storage condition and stone pouring time.
MATERIALS AND METHODS
Each of upper and lower impressions of dental model was taken. The dental stone models were made immediately, 10, 30, 60, 180, 360 minutes after the impressions were taken at each storage condition. 3D models were constructed by scanning the stone model using 3D laser scanner. With Reference points, positioned on digital models, linear measurements of the dimensional change were compared by 3D metrology software, 3D average models were made and superimposition to identify the specific site of dimensional change and to measure surface deviation (mm).
RESULTS
Dental stone models which were made immediately after taking the impression showed the smallest linear dimensional change. As the stone pouring time was prolonged, the linear dimensional change was increased. More than 180 minutes after impression taking, linear dimensional change and surface distortion increased in the posterior molar region, regardless of the storage condition.
CONCLUSION
For the optimum accuracy of the dental stone casts, alginate impression should be poured as soon as possible. If there were a need for storing, a humidor with 100% relative humidity must be used and be stored less than 180 minutes to fabricate the accurate dental model.

Keyword

alginate impression; dimensional stability; 3D superimposition

MeSH Terms

Colloids*
Dental Models
Humidity
Linear Models
Molar
Colloids

Figure

  • Fig. 1 Impression taking device. (A) Master model fixed on a metal plate, (B) Positioning rod hold the impression tray tight.

  • Fig. 2 Linear measurements at reference point of 3D model. a, inter canine distance; b, inter first molar distance; c, inter second molar distance; d, arch length; e, first molar height; f, second molar height.

  • Fig. 3 Superimposition procedure for dimensional change analysis between master model and experimental group model.

  • Fig. 4 Maxillary surface deviation according to storage condition and stone pouring time. R.H, relative humidity.

  • Fig. 5 Maxillary surface deviation of stone pouring time on relative humidity 100 % humidor. (A) Immediately, (B) 10 minutes, (C) 30 minutes, (D) 60 minutes, (E) 180 minutes (F) 360 minutes.

  • Fig. 6 Maxillary surface deviation of stone pouring time on relative humidity 35% air. (A) Immediately, (B) 10 minutes, (C) 30 minutes, (D) 60 minutes, (E) 180 minutes, (F) 360 minutes.

  • Fig. 7 Mandibular surface deviation according to storage condition and stone pouring time. R.H, relative humidity.

  • Fig. 8 Mandibular surface deviation of stone pouring time on relative humidity 100% humidor. (A) Immediately, (B) 10 minutes, (C) 30 minutes, (D) 60 minutes, (E) 180 minutes, (F) 360 minutes.

  • Fig. 9 Mandibular surface deviation of stone pouring time on relative humidity 35% air. (A) Immediately, (B) 10 minutes, (C) 30 minutes, (D) 60 minutes, (E) 180 minutes, (F) 360 minutes.


Cited by  1 articles

Accuracy evaluation of dental models manufactured by CAD/CAM milling method and 3D printing method
Yoo-Geum Jeong, Wan-Sun Lee, Kyu-Bok Lee
J Adv Prosthodont. 2018;10(3):245-251.    doi: 10.4047/jap.2018.10.3.245.


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