Effect of water storage on tooth displacement in maxillary complete dentures

Mesquita, Marcelo Ferraz; Consani, Símonídes; Sobrinho, Lourenço Correr; Sousa-Neto, Manoel Damião

doi:10.1590/s0103-64402006000100012

Cited by 16 publications

(15 citation statements)

References 15 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%

“…Whereas in the studies of Goodkind and Schulte (15) immersion in water did not produce significant dimensional changes in resin denture bases. An study developed by Consani et al (16) showed that the water storage for a period of 90 days did not promote significant dimensional changes in the teeth distances when compared to the deflasking period. The results found in this study (Tables 1-3) must be related to the long period of immersion in water (180 days), which resulted in increased dimensional changes with expansion of denture bases, causing major disadaptation (17).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

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%

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

“…The association between gypsum or silicone and water storage did not alter the distances between teeth, except for the PM-PM distance after a 3-month water storage period with silicone investment 2 . Recent work had suggested that teeth displacement due to water immersion is also influenced by other factors such as base thickness, palate form, and difference in the stress releasing induced in different parts of the flask 6 . It may be speculated that the difference observed in the RPM-RM distance would not be detected by the patients during clinical use.…”

Section: Discussionmentioning

confidence: 99%

Dimensional stability of distances between posterior teeth in maxillary complete dentures

2006

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…We suppose that these differences are related to the methodology applied to measure tooth displacement in the present study, which was based on tooth inclination angles, instead of linear measurements. Also, it is possible that other variables present during denture processing, as flask closure method 6,7 , post‐pressing time 6 , flask cooling method 7 , water storage 5 , and flasking and polymerisation techniques 8 , may have exerted more influence on polymerisation shrinkage, relief of internal strains after denture deflasking, and consequently molar teeth displacement, than the effects because of differences among investing materials and flask designs evaluated in this study.…”

Section: Discussionmentioning

confidence: 99%

“…These changes may result in traumatic occlusion, irregular distribution of occlusal stresses on underlying tissues, and alterations of dental function, denture comfort, and chewing efficiency 4 . Many studies have investigated tooth displacement and its relationship with the variables involved in denture construction, as flask closure 5,6 , flask cooling method and deflasking procedure 7 , post‐pressing time 8 , water storage 5 and polymerisation techniques 8 , but an ideal protocol that leads to minimum changes has not been established.…”

Section: Introductionmentioning

confidence: 99%

The influence of double flask investing on tooth displacement in dentures processed by microwave irradiation

2011

View full text Add to dashboard Cite

Objective: This study evaluated the influence of the bimaxillary flask (BMF) and two different investing materials on first molar inclination in dentures processed by microwave irradiation. Background: The BMF may minimise tooth displacement, saving time and improving occlusion. Methods and materials: Forty pairs of dentures were randomised into four groups: stone wall in monomaxillary flask; silicone wall in BMF; stone wall in BMF; acrylic resin retentions and silicone in BMF. Dentures were processed by microwave irradiation. Two referential points were established on tooth surface. A microscope and a digital pachymeter were used to measure the distance between these points, and the angles a (right maxillary molar), b (left maxillary molar), a¢ (right mandibular molar) and b¢ (left mandibular molar) were calculated by the law of cosines. Data were submitted to Kruskal-Wallis (5% significance). Results: No difference was observed among the groups (p > 0.05). In the intra-group analysis, a was significantly different for groups I, II and III; a¢, for groups II and IV; b, for all groups; b¢, for groups III and IV. Conclusion: First molar inclination was similar for monomaxillary and BMFs. The use of stone or silicone as investing materials presented the same effect on tooth inclination.

show abstract

Effect of water storage on tooth displacement in maxillary complete dentures

Cited by 16 publications

References 15 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

Dimensional stability of distances between posterior teeth in maxillary complete dentures

The influence of double flask investing on tooth displacement in dentures processed by microwave irradiation

Contact Info

Product

Resources

About