Influences of differences in tray design and impression material on impression pressure at edentulous mandible

Inoue, Shigeru; Kawara, Misao; Iida, Takashi; Iwasaki, Masatoshi; Komiyama, Osamu

doi:10.2334/josnusd.16-0731

Cited by 5 publications

(5 citation statements)

References 21 publications

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“…Sayumi et al [ 25 ] and Al-Ahmad et al [ 15 ] found that impression pressure was higher at the median alveolar crest than at the buccal shelf area in the tray without a spacer, but in our study, the result was found with more microstrain value in the buccal shelf area (953.03) than in the alveolar crest area (897.07). There may be several reasons why there is a difference in results between this study and that of Al-Ahmad et al and Sayumi et al The main difference between these studies is that our study was in vivo, and the pressure was applied manually with fingers at the first molar areas.…”

Section: Discussioncontrasting

confidence: 77%

Section: Discussionmentioning

confidence: 99%

“…Sayumi et al [ 25 ] found that impression pressure on buccal shelves in trays with 1.4 mm of relief and escape holes at the alveolar crests was significantly higher than that on the alveolar crests in all impression materials. He also claimed that increasing relief thickness expands the space through which impression material flows near the mandibular alveolar crests, thereby reducing impression pressure [ 25 ]. Al-Ahmad et al [ 15 ] did an in vitro study to measure the pressure exerted under a simulated mandibular edentulous impression at different locations using commonly used impression material and four impression tray configurations.…”

Section: Discussionmentioning

confidence: 99%

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Microstrain Analysis of Selective Pressure Techniques for Mandibular Complete Denture Impression: An In Vivo Study

Dadarwal¹,

Paliwal²,

Sharma³

et al. 2022

Cureus

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Aim The present in vivo study was undertaken for microstrain analysis of the selective pressure impression technique using strain gauges in mandibular complete denture impression. Methodology Ten completely edentulous patients undergoing complete denture treatment were selected for the study. For each patient, mandibular casts were made, and two custom trays were fabricated on the mandibular cast. These mandibular trays were divided into two groups: those with mandibular impressions made in the custom tray with the use of a spacer (MST) and those without a spacer (MWS). For each patient, a primary impression was made by using an impression compound. After that, the primary cast was obtained, and the custom tray was fabricated by using auto polymerizing resin. Then strain gauges were attached to the particular areas of the tray. The customized tray with zinc oxide eugenol impression material was seated in the patient's mouth for the final impression. The strain produced during impression making at different areas was recorded by a multi-channel (six) strain amplifier and data logger (8-channel digital strain indicator NIC, Jaipur, India). The data obtained were subjected to statistical analysis using an independent t-test (for quantitative data within two groups). The level of significance was set at p=0.05 (p<0.05-significant, p<0.01-highly significant, p<0.0001-very highly significant). Results The comparison of the percentage of microstrain produced at the relief area with and without spacer tray design showed a statistically significant (p=0.001) result with a greater number of percentages of microstrain among those without spacers (94.19) than with spacer (72.09) tray design. Conclusion The use of a tray with relief for selective pressure impression of an edentulous mandible resulted in a desirable pressure distribution at the alveolar crests and buccal shelves.

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Section: Discussioncontrasting

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Microstrain Analysis of Selective Pressure Techniques for Mandibular Complete Denture Impression: An In Vivo Study

Dadarwal¹,

Paliwal²,

Sharma³

et al. 2022

Cureus

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“…In this case Inoue et al consider three types of impression materials, polyvinylsiloxane elastomer, polyether elastomer, and alginate (Figure 1, Figure 2 and Figure 3). The pressure during setting had no significant effect on precision, but an excessive pressure can be alleviated with escape holes and relief on the tray [43]. Hyde et al in 2014 recruited 85 patients and performed an Randomized Controlled Trial (RCT) using alginate or silicone impressions for complete denture creation.…”

Section: Discussionmentioning

confidence: 99%

Alginate Materials and Dental Impression Technique: A Current State of the Art and Application to Dental Practice

et al. 2018

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Hydrocolloids were the first elastic materials to be used in the dental field. Elastic impression materials include reversible (agar-agar), irreversible (alginate) hydrocolloids and synthetic elastomers (polysulfides, polyethers, silicones). They reproduce an imprint faithfully, providing details of a high definition despite the presence of undercuts. With the removal of the impression, being particularly rich in water, the imprints can deform but later adapt to the original shape due to the elastic properties they possess. The advantages of using alginate include the low cost, a better tolerability on the part of the patient, the ease of manipulation, the short time needed for execution, the instrumentation and the very simple execution technique and possibility of detecting a detailed impression (even in the presence of undercuts) in a single step. A comprehensive review of the current literature was conducted according to the PRISMA guidelines by accessing the NCBI PubMed database. Authors conducted a search of articles in written in English published from 2008 to 2018. All the relevant studies were included in the search with respect to the characteristics and evolution of new marine derived materials. Much progress has been made in the search for new marine derived materials. Conventional impression materials are different, and especially with the advent of digital technology, they have been suffering from a decline in research attention over the last few years. However, this type of impression material, alginates (derived from marine algae), have the advantage of being among the most used in the dental medical field.

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“…De manera general nuestro estudio corrobora esta información, ya que en todos los grupos estudiados y el alginato cromático utilizado evidenció cambios dimensionales pequeños que oscilaron entre 0,06-0,97 mm; esto señala que antes de los 15 minutos de vaciados los cambios dimensionales son mínimos, pero no por eso se debe prolongar el tiempo de vaciado. Se ha aconsejado que las impresiones deben ser vaciadas antes de los 30 minutos porque existen cambios dimensionales que obligarán a repetir la impresión con alginato 22 . En nuestra investigación el alginato uti-lizado no evidenció amplios cambios dimensionales al cabo de 15 minutos de vaciado, pese a que otros autores como Iwasaki y cols.…”

Section: Discussionunclassified

Influencia de las condiciones del tiempo y almacenamiento en la estabilidad dimensional de los moldes fabricados a partir de hidrocoloides irreversibles

Roca-Sacramento

Ibarra-Vásquez

Amado-Chavez

et al. 2018

Odontol. sanmarquina

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Objetivo: Evaluar los cambios dimensionales de los modelos de yeso a partir de impresiones con hidrocoloide irreversible (alginato) bajo distintos tiempos de vaciado y condiciones de almacenamiento. Métodos: Estudio experimental in vitro que realizó 130 impresiones con hidrocoloide irreversible (Tropicalgin ®) sobre un modelo maestro. Las impresiones fueron asignadas en 13 grupos dependiendo del tiempo de vaciado (a los 5, 10 y 15 minutos), según las condiciones de almacenamiento (uso de torundas de algodón y/o empaques herméticas) y combinando las condiciones con los tiempos de vaciado. Las medidas de los modelos en yeso (altura y diámetro) fueron comparadas con las mediciones del modelo maestro para calcular los cambios dimensionales. Resultados: A nivel de la altura se obtuvo un cambio dimensional de 0,3 ± 0,22 mm con el uso de torundas, sellado hermético y vaciado a los 15 minutos (décimo tercer grupo), mientras que con el vaciado inmediato (primer grupo) se obtuvo un cambio de 0,41 ± 0,38 mm (p=0,03). A nivel del diámetro el cambio dimensional del décimo tercer grupo fue de 0,08 ± 0,12 mm mientras que con el primer grupo fue de 0,06 ± 0,04 mm (p=0,41) siendo estos los grupos con mayores cambios dimensionales. Conclusiones: Los grupos de modelos con impresiones almacenadas con torundas y empaques herméticos evidenciaron los menores cambios dimensionales a los 5, 10 y 15 minutos de tiempo de vaciado. Los modelos obtenidos con los tiempos de vaciado a los 10, 15 minutos y sin condiciones de almacenamiento demostraron los mayores cambios dimensionales tanto en altura como en diámetro.

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Influences of differences in tray design and impression material on impression pressure at edentulous mandible

Cited by 5 publications

References 21 publications

Microstrain Analysis of Selective Pressure Techniques for Mandibular Complete Denture Impression: An In Vivo Study

Microstrain Analysis of Selective Pressure Techniques for Mandibular Complete Denture Impression: An In Vivo Study

Alginate Materials and Dental Impression Technique: A Current State of the Art and Application to Dental Practice

Influencia de las condiciones del tiempo y almacenamiento en la estabilidad dimensional de los moldes fabricados a partir de hidrocoloides irreversibles

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