Posterior peripheral seal distortion related to processing temperature

Firtell, David N.; Green, Allen J.; Elahi, Jaffar M.

doi:10.1016/0022-3913(81)90418-2

Cited by 42 publications

(36 citation statements)

References 16 publications

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“…Previous studies have reported that the largest base dimensional changes are observed in the denture posterior palatal seal [5, 17, 18], and that a greater magnitude of tooth movement occurs in posterior teeth, altering the occlusal relationship [19, 20]. However, the present study showed statistically significant tooth movement only in the I-I distance (Table 2 ).…”

Section: Discussioncontrasting

confidence: 66%

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Effect of Flask Closure Method and Post-Pressing Time on the Displacement of Maxillary Denture Teeth

Negreiros¹,

Mesquita²,

Sinhoreti³

et al. 2009

TODENTJ

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The purpose of this study was to verify the influence of flask closure methods and post-pressing times on tooth displacement in maxillary dentures. Twenty similar maxillary dentures were made using a heat-polymerized acrylic resin, and randomly assigned to 4 experimental groups (n=5) according to the protocol: 1-conventional flask closure and immediate polymerization; 2- conventional flask closure and polymerization after 6-hour post-pressing time; 3- RS flask closure system and immediate polymerization; and 4- RS flask closure system and polymerization after 6-hour post-pressing time. Three transverse and 2 anteroposterior linear distances between teeth were measured before and after the denture processing with an optical microscope with accuracy of 0.0005mm. Analysis of variance (ANOVA) and Tukey’s test were performed to compare the results. The 6-hour post-pressing time (conventional = 0.44mm and RS = 0.33mm) showed no statistically significant difference in tooth movement, in relation to the flask closure methods, when compared to the immediate time (conventional = 0.40mm and RS = 0.28mm). The RS system standardized the tooth displacement, independently of the post-pressing times. Dimensional changes were more uniform when the dentures were submitted to the 6-hour post-pressing time and RS flask closure method, suggesting that these factors may reduce the magnitude of tooth movement.

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Section: Discussioncontrasting

confidence: 66%

“…Earlier studies [4, 5] showed that the magnitude of dimensional changes is not too great (-0.1% to -0.4%), and have been reported as having no significant effect on the serviceability of dentures [6]. This undesirable dimensional change remains unresolved [7-11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Flask Closure Method and Post-Pressing Time on the Displacement of Maxillary Denture Teeth

Negreiros¹,

Mesquita²,

Sinhoreti³

et al. 2009

TODENTJ

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“…Crazing, on the other hand, is the formation of cracks on the resin surface which may be stress induced, or the incorporation of water during polymerization and/or because of a solvent attack. Warpage can occur due to stresses incorporated during polymerization [20][21][22] . Volumetric and linear shrinkages of the resin during the polymerization process is inherent to the conventional flask-pack-press technique, requiring occlusal adjustments immediately after de-flasking and carving of a post-dam to compensate for a potential lift-off of the palatal plate from the plaster model.…”

Section: Discussionmentioning

confidence: 99%

CAD/CAM milled complete removable dental prostheses: An <i>in vitro</i> evaluation of biocompatibility, mechanical properties, and surface roughness

Srinivasan

Gjengedal

Cattani-Lorente

et al. 2018

Dental Materials Journal

109

124

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This study compared the biocompatibility, mechanical properties, and surface roughness of a pre-polymerized polymethyl methacrylate (PMMA) resin for CAD/CAM complete removable dental prostheses (CRDPs) and a traditional heat-polymerized PMMA resin. Two groups of resin substrates [Control (RC): conventional PMMA; Test (RA): CAD/CAM PMMA] were fabricated. Human primary osteoblasts and mouse embryonic-fibroblasts were cultured for biocompatibility assays. Mechanical properties and surface roughness were compared. ANOVA revealed no difference between the resin groups in the biocompatibility assays. RA demonstrated a higher elastic modulus (p=0.002), young's modulus (p=0.002), plastic energy (p=0.002), ultimate strength (p=0.0004), yield point (p=0.016), strain at yield point (p=0.037), and toughness (p<0.0001); while RC displayed a higher elastic energy (p<0.0001). Laser profilometry concluded a rougher surface profile (p<0.0001) for RA. This study concluded that the tested CAD/CAM resin was equally biocompatible and presented with improved mechanical properties than the traditional heat-polymerized PMMA resin used in the fabrication of CRDPs.

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“…In acrylic resin the two main unavoidable dimensional changes are expansion and shrinkage 1 . Dimensional changes occur as a result of shrinkage of monomer and release of stress during polymerization 2 . The extent of dimensional changes in acrylic resin may be due to various factors like technique of polymerization, release of internal stresses due to variation in the coefficient of thermal expansion between resin and gypsum, and thickness of the denture base 3 .…”

mentioning

confidence: 99%

Effect of Micro‐Additions of Carbon Nanotubes to Polymethylmethacrylate on Reduction in Polymerization Shrinkage

Turagam

Mudrakola

2012

Journal of Prosthodontics

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Posterior peripheral seal distortion related to processing temperature

Cited by 42 publications

References 16 publications

Effect of Flask Closure Method and Post-Pressing Time on the Displacement of Maxillary Denture Teeth

Effect of Flask Closure Method and Post-Pressing Time on the Displacement of Maxillary Denture Teeth

CAD/CAM milled complete removable dental prostheses: An <i>in vitro</i> evaluation of biocompatibility, mechanical properties, and surface roughness

Effect of Micro‐Additions of Carbon Nanotubes to Polymethylmethacrylate on Reduction in Polymerization Shrinkage

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