A new method of measuring dimensional change

DaBreo, E.L.; Herman, Paul F.

doi:10.1016/0022-3913(91)90212-f

Cited by 29 publications

(13 citation statements)

References 12 publications

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“…These results are consistent with those of a number of studies in the literature 8,9,19 . No significant difference was observed in the dimensional linear change when the acrylic resin was water stored for 90 days, probably due to the residual monomer, which impedes the sorption of water and maintains the dimensional stability of the denture base 9 .…”

Section: Discussionsupporting

confidence: 83%

“…Thus, water equilibrium and consequent denture base dimensional stability is often attained 17 . The dimensional changes of light-cured, heatcured, and self-cured denture base resins were different from each other when stored in distilled water at 37°C for 7 days 8 . Conversely, the linear dimensional changes observed were similar in all resin brands after storage in water for 30, 60 and 90 days at 37°C, and these changes were so small that they were not clinically detectable 9 .…”

Section: Introductionmentioning

confidence: 99%

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Dimensional stability of distances between posterior teeth in maxillary complete dentures

2006

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ABSTRACT:The aim of this study was to assess the displacement of posterior teeth in maxillary complete dentures stored in water at 37°C. Twenty acrylic resin-based maxillary complete dentures were constructed with the anterior teeth arranged in normal overlap and the posterior teeth in Angle class I. Metallic pins were placed on the labial cusp of the fi rst premolars (PM), and on the mesiolabial cusp of the second molars (M). The fi nal acrylic resin pressing was made in a metallic fl ask with aid of the RS tension system, and polymerized in a moist-hot cycle at 74°C for 9 hours. The dentures were defl asked after cooling in their own polymerizing water or after cooling in polymerizing water plus bench storage for 3 hours, and stored in water at 37°C for periods of 7, 30, and 90 days. Following defl asking and after each storage period tested, the PM-PM (premolar to premolar), M-M (molar to molar), LPM-LM (left premolar to left molar), and RPM-RM (right premolar to right molar) distances were measured with an STM Olympus microscope, with an accuracy of 0.0005 mm. Collected data were submitted to ANOVA and Tukey's test (5%). There was no statistically signifi cant difference for the PM-PM, M-M, and LPM-LM distances after all storage periods when the fl ask cooling methods were considered. With exception of the RPM-RM distance after the 30-days water plus bench storage period, the other distances remained statistically stable. DESCRIPTORS:Denture, complete; Water storage; Tooth movement. RESUMO:O propósito deste trabalho foi verifi car a movimentação de dentes posteriores em prótese total superior armazenada em água a 37°C. Vinte próteses totais superiores foram confeccionadas com resina acrílica, com os dentes anteriores em transpasse normal e os posteriores em Classe I de Angle. Pinos metálicos foram colocados na cúspide vestibular dos primeiros pré-molares (PM) e cúspide mésio-vestibular dos segundos molares (M). A prensagem fi nal da resina acrílica foi feita em mufl a metálica com auxílio do dispositivo RS de contensão e a polimerização em ciclo de água a 74°C durante 9 horas. As próteses foram demufl adas após esfriamento em água de polimerização ou em água de polimerização mais armazenagem em bancada por 3 horas e armazenadas em água a 37°C pelos períodos de 7, 30 e 90 dias. Após demufl agem e após cada período de armazenagem em água, as distâncias PM-PM (pré-molar a pré-molar), M-M (molar a molar), PMD-MD (pré-molar direito a molar direito) e PME-ME (pré-molar esquerdo a molar esquerdo) foram medidas com microscópio Olympus STM, com precisão de 0,0005 mm. Os dados coletados foram submetidos à análise de variância e ao teste de Tukey com signifi cância de 5%. Em todos os períodos de armazenagem, as distâncias PM-PM, M-M e PME-ME não apresentaram diferenças estatisticamente signifi cativas quando as mufl as foram esfriadas pelos dois métodos. Com exceção da distância PMD-MD no período de 30 dias de armazenagem em água mais bancada, as demais distâncias permaneceram sem diferença estatística signifi cativa.

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Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Dimensional stability of distances between posterior teeth in maxillary complete dentures

2006

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“…The total strain obtained from the bench cooling system was in agreement with the values derived for the dimensional change of 0.45-0.72%. 5,6,[19][20][21] There, the dimensional changes, as reported by the researchers, were different due to the direction of the shrinkage, such as width or length. The direction of the change of the specimen is strongly dependent on the shape of the specimen, since the stone mold surrounding the specimen restricted the isotropic shrinkage of the denture base resin.…”

Section: Discussionmentioning

confidence: 84%

Effect of bench cooling on the dimensional accuracy of heat-cured acrylic denture base material

Kimoto¹,

Kobayashi²,

Kobayashi³

et al. 2005

Journal of Dentistry

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“…It has been demonstrated that water sorption by the denture during clinical use is not large, and the resultant expansion caused partially compensates the polymerization shrinkage 8 , where water balance and consequent dimensional stability of the denture base are often attained 15 . A study demonstrated that the dimensional changes of light-cured, heat-cured, and self-cured denture base resins were different from each other when stored in distilled water at 37ºC for 7 days 5 . Conversely, the linear dimensional changes observed were similar in all resin brands after storage in water for 30, 60 and 90 days at 37ºC, and these changes were so small that they were not clinically detectable 6 .…”

Section: Introductionmentioning

confidence: 99%

Influence of the deflasking delay time on the displacements of maxillary denture teeth

2003

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he purpose of this study was to investigate the displacement of teeth occurring in dentures following storage in water at a temperature of 37ºC. Ten maxillary dentures were constructed with Classico heat-cured acrylic resin using conventional metal flasks. Metallic reference pins were placed on the incisal border of the central incisors (I), buccal cusp of the first premolars (PM), and mesiobuccal cusp of the second molars (M). The acrylic resin was polymerized twelve hours after final flask closure in a water cycle at 74ºC for 9 hours. The flasks were removed from the thermo-curing unit after water cooling and then bench stored for 3 hours. After deflasking and finishing, the dentures were stored in water at a temperature of 37ºC for periods of 7, 30, and 90 days. Following deflasking and each storage period tested, the I-I (incisor to incisor), PM-PM (premolar to premolar), and M-M (molar to molar) transverse distances, and LI-LM (left incisor to left molar) and RI-RM (right incisor to right molar) anteroposterior distances were measured with a STM Olympus microscope, with accuracy of 0.0005 mm. Colleted data were submitted to ANOVA and Tukey test (5%). No statistically significant difference was observed in the displacement of teeth in the transverse and anteroposterior distances.

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A new method of measuring dimensional change

Cited by 29 publications

References 12 publications

Dimensional stability of distances between posterior teeth in maxillary complete dentures

Dimensional stability of distances between posterior teeth in maxillary complete dentures

Effect of bench cooling on the dimensional accuracy of heat-cured acrylic denture base material

Influence of the deflasking delay time on the displacements of maxillary denture teeth

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