Effect of denture thickness and curing cycle on the dimensional stability of acrylic resin denture bases

Chen, J.C.; Lacefield, William R.; Castleberry, D.J.

doi:10.1016/s0109-5641(88)80083-6

Cited by 80 publications

(91 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Measurements were made before and after 6 months of storage in distilled water, at three different points: the crests of the right (A) and left (B) ridges, and the median region of the palate (M). The results of this investigation are in agreement with those of previous studies (3,5,(8)(9)(10)(11)(12)(13)(14)(15)(16). The greatest dimensional change (0.3109 mm) between the resin base and the plaster cast occurred in the median region of the palate (M).…”

Section: Discussionsupporting

confidence: 91%

“…Chen et al (3) affirmed that most dimensional changes that affect the position of the teeth are not clinically significant, and, these changes can be easily corrected by occlusal adjustments. However, according to these authors, dimensional changes in the posterior region of the palate are critical, as this is a very important area for denture retention.…”

Section: Discussionmentioning

confidence: 99%

“…The magnitude of the acrylic resin dimensional changes may be influenced by several factors, such as polymerization techniques, in which the internal stresses are produced by different coefficients of thermal expansion of gypsum and acrylic resin (1), and the base thickness, which may vary at different sites inside the flask (2,3), altering the denture base adaptation and stability (4).…”

Section: Introductionmentioning

confidence: 99%

“…The shrinkage resulting from the polymerization reaction is not uniform, being more evident on the palate of the maxillary denture and is be poorly compensated after resin base processing (3). Conversely, the distortion resulting from flask cooling and stone cast deflasking induces stresses released during the base procedure (6).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of storage period and effect of different brands of acrylic resin on the dimensional accuracy of the maxillary denture base

et al. 2008

View full text Add to dashboard Cite

The aim of this study was to evaluate the dimensional changes of denture bases made from different resins after different storage periods. For this purpose, 25 sets of plaster models/resin bases were prepared using 4 acrylic resins submitted to two types of polymerization: 1-QC-20 submitted to polymerization by microwave energy; 2-QC-20 submitted to polymerization by water hot bath; 3-Vipi Cril submitted to polymerization by water hot bath; 4-Vipi Wave submitted to polymerization by microwave energy; and 5-Onda Cryl submitted to polymerization by microwave energy. After polymerization, the specimens were sectioned for accuracy readings using a comparison microscope. Readings were taken at 3 points: the crests of the right (A) and left (B) ridges, and the median region of the palate, in 4 different periods. The data obtained were submitted to two-way ANOVA and Tukey's test at 5% significance level. The greatest distortions were found in the posterior palatal region of the base (M), with statistically significant difference (p<0.05) for the studied resins. All acrylic resins presented dimensional changes and the storage period influenced these alterations.

show abstract

Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of storage period and effect of different brands of acrylic resin on the dimensional accuracy of the maxillary denture base

et al. 2008

View full text Add to dashboard Cite

show abstract

“…10,11,15 Studies on light-curing resin showed that on being exposed to polymerizing light, the closest material would be polymerized first, which causes the formation of gap due to transformation and contraction. 16 The reason of such formation of gap with the master cast is the contraction because polymerization and cooling, 17 and being lifted by internal stress during polymerization. 18 With the present study, in comparison of accuracies according to the positions, the midpalatal region showed less accuracy than the left and right alveolar crests, and the maximum discrepancy occurred at point B at the posterior border, which is in agreement with the results of previous studies.…”

Section: Discussionmentioning

confidence: 99%

Improving Dimensional Stability of Visible Light-cured Trial Denture Base using Different Colored Casts

Elkholy¹

2016

Journal of Contemporary Dentistry

View full text Add to dashboard Cite

Purpose: This study aimed to evaluate the effects of the color of the cast on dimensional stability of visible light-cured (VLC) trial denture bases. Materials and methods:A total of 60 VLC acrylic resin trial denture bases were fabricated on different colored casts (20 white, 20 dark blue, and 20 dark brown casts) and were divided into two groups; each group consisted of 30 casts (10 white, 10 dark blue, and 10 dark brown). The gap between the base and the cast after 24 hours was measured at different points (left crest of the ridge, midpalatal area, and right crest of the ridge) at the posterior and premolar areas for group I and after 48 hours for group II by using a stereomicroscope. Results:With brown cast, the trial denture base showed significant decrease in dimensional change in comparison with white and blue casts after 24 and 48 hours. Conclusion:The dimensional accuracy of the VLC trial denture base could be improved by using dark-colored cast during construction, to ensure accurate maxillomandibular relationship and accurate evaluation of phonetics and esthetic of wax trial dentures.

show abstract

Effect of metallic flask closure and investment materials on the stability of the denture base resin

Mesquita

Sobrinho

Sinhoreti

2010

J of Applied Polymer Sci

View full text Add to dashboard Cite

This study evaluated the dimensional stability of the poly-methylmethacrylate (PMMA) denture bases under the effect of different metallic flask closure techniques (FCT) and investment materials (IM). Sixty stone cast maxillary-wax base plate sets were randomly assigned to six groups (n ¼ 10) for the following treatments: 1 and 4-stone or silicone investments and flask closure with clamp; 2 and 5-stone or silicone investments and flask closure with RS system; 3 and 6-stone or silicone investments and flask closure with screws. PMMA denture bases were polymerized in a water bath at 74 C for 9 h. PMMA base-stone cast sets were sectioned at regions (R) of the canines, first molars, and posterior palatal zone. Gap discrepancies were measured at five points: right and left ridge crests, palatal midline, and right and left marginal limits of the flanges. An optical micrometer with accuracy of 0.0005 mm was used for measurement purposes. Data were submitted to ANOVA and Tukey's test (a ¼ 0.05). Silicone showed an adaptation mean (0.177 mm) significantly different when compared with stone (0.207 mm). The RS system presented a statistically different adaptation mean (0.166 mm) in relation to the traditional clamp (0.200 mm) and flask with screws (0.211 mm). Adaptation values for the regions of the canines (0.141 mm), first molars (0.185 mm), and posterior palatal (0.250 mm) were statistically different. For all flask closure techniques, better adaptation was shown with the RS system and silicone investment.

show abstract

Effect of denture thickness and curing cycle on the dimensional stability of acrylic resin denture bases

Cited by 80 publications

References 17 publications

Influence of storage period and effect of different brands of acrylic resin on the dimensional accuracy of the maxillary denture base

Influence of storage period and effect of different brands of acrylic resin on the dimensional accuracy of the maxillary denture base

Improving Dimensional Stability of Visible Light-cured Trial Denture Base using Different Colored Casts

Effect of metallic flask closure and investment materials on the stability of the denture base resin

Contact Info

Product

Resources

About