J Adv Prosthodont.  2010 Sep;2(3):102-105. 10.4047/jap.2010.2.3.102.

Effect of two-phase fabrication method for the optimum fit of light-polymerized record bases

• Huh JB
• Kang MG
• Shin SW
• Ryu JJ

• KMID: 2118115
• DOI: http://doi.org/10.4047/jap.2010.2.3.102

Abstract

PURPOSE
The aims of this study were to suggest a method of fabrication of the record base using a light-polymerized resin by applying the two-phase fabrication method for the improvement of the fit of the record base and to compare the degree of fit according to the separation site. MATERIAL AND METHODS: In the edentulous cast of maxilla, four test groups were considered. In the first, second, third, and fourth test groups (n = 12 in each group) the separation was done at 0, 5, 10, and 15 mm, respectively below the alveolar crest along the palatal plane. For the control group, the record base was made without separating the two sections. The light-body silicone material was injected into the fitting surface of the record base. It was then placed onto the cast and finger pressure was applied to stabilize it in a seated position followed by immediate placement onto the universal test device. Finally, the mass of the impression material was measured after it was removed. ANOVA was performed using the SAS program. For the post-hoc test, the Wilcoxon Rank-Sum test and the Tukey-Kramer HSD test were performed (alpha = 0.05).
RESULTS
The control group and Group 3, 4 showed significant differences. The Group 3 and 4 showed significantly smaller inside gaps than the control group which was not made with the two-phase fabrication method.
CONCLUSION
The two-stage polymerized technique can improve the fit of the denture base particularly when the separation was made at 10 to 15 mm from the alveolar crest.

Keyword

Record base; Two-stage polymerization; Fit

MeSH Terms

Collodion
Denture Bases
Fingers
Maxilla
Phenothiazines
Polymers
Silicones
Collodion
Phenothiazines
Polymers
Silicones

Figure

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  Fig. 1 Set-up guide line for the production of the experimental group.

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  Fig. 2 Fabrication of two stage record base (In case of Test group 4; 15 mm below the alveolar crest along the alveolar ridge). A: The record base was divided into two U-shaped segments 15 mm below the alveolar crest along the alveolar ridge. Light polymerization of the record base placed on the cast was performed. B: The gap between the two parts in the cast was filled again with light-polymerized resin, followed by light polymerization for an additional 15 minutes.

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  Fig. 3 Box-plot chart of each group.

Reference

1. Nishigawa G, Maruo Y, Okamoto M, Minagi S. Record base for an edentulous maxillary arch with severe undercuts in the labial aspect of the anterior residual ridge. J Prosthet Dent. 2002. 87:99–101.

2. Boberick KG, McCool J. Dimensional stability of record bases fabricated from light-polymerized composite using two methods. J Prosthet Dent. 1998. 79:399–403.

3. Elahi JM, Abdullah MA. Effect of different polymerization techniques on dimensional stability of record bases. J Prosthet Dent. 1994. 71:150–153.

4. Takamata T, Setcos JC. Resin denture bases: review of accuracy and methods of polymerization. Int J Prosthodont. 1989. 2:555–562.

5. Sykora O, Sutow EJ. Posterior palatal seal adaptation: influence of processing technique, palate shape and immersion. J Oral Rehabil. 1993. 20:19–31.

6. Oh WS, May KB. Two-stage technique for optimum fit and stability of light-polymerized record bases. J Prosthet Dent. 2008. 99:410–411.

7. Kim Y, Michalakis KX, Hirayama H. Effect of relining method on dimensional accuracy of posterior palatal seal. An in vitro study. J Prosthodont. 2008. 17:211–218.

8. Consani RL, Domitti SS, Rizzatti Barbosa CM, Consani S. Effect of commercial acrylic resins on dimensional accuracy of the maxillary denture base. Braz Dent J. 2002. 13:57–60.

9. Takamata T, Setcos JC, Phillips RW, Boone ME. Adaptation of acrylic resin dentures as influenced by the activation mode of polymerization. J Am Dent Assoc. 1989. 119:271–276.