J Adv Prosthodont.  2016 Aug;8(4):296-303. 10.4047/jap.2016.8.4.296.

Three dimensional deformation of dry-stored complete denture base at room temperature

Affiliations
  • 1Department of Prosthodontics, College of Dentistry, Dankook University, Cheonan, Republic of Korea. joon322@dankook.ac.kr

Abstract

PURPOSE
The aim of this study was to evaluate whether there is any typical deformation pattern existing in complete denture when it was dried by using the 3D scanner and surface matching program.
MATERIALS AND METHODS
A total of 28 denture bases were fabricated with heat curing acrylic resin (each 14 upper and lower denture bases), and 14 denture bases (each 7 upper and lower denture bases) were stored in the water bottle (water stored), and another 14 denture bases were stored in the air (dry stored). Each specimen was scanned at 1st day after deflasking, 14th day after deflasking, and 28th day after deflasking, and digitalized. Three dimensional deformation patterns were acquired by comparison of the data within storage group using surface matching program. For evaluating differences between groups, these data were compared statisticallyusing Kruskal Wallis and Mann Whitney-U test (α=.05).
RESULTS
When evaluating 3D deformation of denture base, obvious deformations were not found in maxillary and mandibular water storage group. However, in dry stored group, typical deformation pattern was detected as storage time passes. It occurred mostly in first two weeks. Major deformations were found in the bilateral posterior area in both maxillary and mandibular group. In maxillary dry stored group, a statistical significance was found.
CONCLUSION
It was proved that in both upper and lower denture bases, dry storage caused more dimensional deformation than water storage with typical pattern.

Keyword

Dimensional deformation; Denture base; 3D surface matching software; Dry storage; Denture storage method

MeSH Terms

Denture Bases
Denture, Complete*
Dentures
Hot Temperature
Water
Water

Figure

  • Fig. 1 Typical feature of color coded maps of water-stored upper denture base. (A) MWa, (B) MWb, (C) MWc.

  • Fig. 2 Typical feature of color coded maps of dry-stored upper denture base. (A) MDa, (B) MDb, (C) MDc.

  • Fig. 3 Typical feature of color coded maps of water-stored lower denture base. (A) NWa, (B) NWb, (C) NWc.

  • Fig. 4 Typical feature of color coded maps of dry-stored lower denture bases. (A) NDa, (B) NDb, (C) NDc.

  • Fig. 5 Box and whisker plots of overall, positive, and negative deformation of maxillary group.

  • Fig. 6 Box and whisker plots of overall, positive, and negative deformation of mandibular group.


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