Effects of relief space and escape holes on pressure characteristics of maxillary edentulous impressions

Komiyama, Osamu; Saeki, Hiroyuki; Kawara, Misao; Kobayashi, Kihei; Otake, Shigeo

doi:10.1016/j.prosdent.2004.03.020

Cited by 19 publications

(22 citation statements)

References 15 publications

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“…The effect on impression pressure was greater when the relief thickness was 1.4 mm rather than 0.36 mm and was markedly greater in trays with escape holes than in those without escape holes. In the edentulous maxilla, the highest impression pressure when making impressions is applied at the center (16,18), most likely because impression pressure is concentrated at the center of the tray, where the outflow region of the impression material is small. It is also believed that in the mandible, impression pressure is similarly concentrated at the median alveolar crest.…”

Section: Discussionmentioning

confidence: 99%

“…In an examination of the effects of escape holes and relief spaces on making edentulous maxillary impressions, Komiyama et al reported that when escape holes and relief were not provided, impression pressure was higher at the palate than at the alveolar crests; however, when escape holes at the mid-palatal suture and relief were provided, this effect was reversed and impression pressure was higher at the alveolar crests than at the palate (18). The present results showed that impression pressure on buccal shelves in trays with 1.4 mm of relief and escape holes at the alveolar crests (R1.4V) was markedly higher than that on the alveolar crests, in all impression materials.…”

Section: Discussionmentioning

confidence: 99%

“…The impression material was injected into the tray, to keep it as uniform as possible. In accordance with a report by Komiyama et al, impression pressure was defined as the pressure at each measurement site 120 s after the start of seating (18).…”

Section: Measurement Methodsmentioning

confidence: 99%

“…Some evidence suggests that the selective pressure technique is the best method for making impressions of edentulous ridges (9). These reports indicate that pressure applied to the interior of the tray at each site should be examined when making Several studies have investigated impression pressure in edentulous jaws (15)(16)(17)(18)(19)(20). Frank et al examined impression pressure in the edentulous maxilla and reported that it varies in relation to tray design (15).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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The aim of this study was to examine the effects of tray design and impression material on impression pressure in a clinical simulation model of an edentulous mandible. Two types of polyvinylsiloxane elastomer, one type of polyether elastomer, and one type of alginate were used. The three tray types had no relief, 0.36 mm of relief, or 1.4 mm of relief, with or without escape holes. Impression pressure was measured at the median alveolar crest, the bilateral alveolar crests corresponding to molars, and the bilateral buccal shelves. Impression pressure significantly differed in relation to tray design and sensor position. In trays without escape holes, impression pressure was highest at the median alveolar crest and lowest at the buccal shelves, for all impression materials. However, impression material had no significant effects on impression pressure. Our results suggest that bite-pressure load on alveolar crests can be alleviated by making an impression with a tray that has relief and escape holes, while applying pressure to buccal shelves and almost no pressure to alveolar crests.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Measurement Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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“…The evidence for pressure variation with impressions comes from the laboratory experiments by Frank, 11 Komiyama, 12 Masri,13 Al-Ahmad 14 and Hyde 15 who have all have shown variation in the pressure of impressions in vitro. However, the level of in vivo evidence and in particular the clinical evidence for particular impression techniques is poor and needs careful consideration.…”

Section: Introductionmentioning

confidence: 99%

A cross-over Randomised Controlled Trial of selective pressure impressions for lower complete dentures

Hyde

Craddock

Blance

et al. 2010

Journal of Dentistry

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Custom double tray for a special impression technique for flabby maxillary residual ridge: Case report

Mostafa

Alanazi

Almarshedy

2022

Clinical Case Reports

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The construction of a removable dental prosthesis for patients with compromised residual alveolar ridges is a challenge for prosthodontists. Flabby anterior ridges and hypermobile tissues in completely edentulous arches require special considerations during prosthetic management, especially when natural dentations remain on the opposite side. Previous studies have revealed that the displacement of flabby tissue can be reduced during impressions by controlling the applied forces via changes in factors such as the tray design, scraping of impression trays, impression material, window technique, and seating velocity of the impressions. However, there may still be some forces applied during impression or there is no even space because there are no trays supporting the vinyl polysiloxane (VPS) impression material in the open window area. Using a custom double tray with even gap between these trays and injecting light body impression material may eliminate these forces and provide accuracy due to even space for the impression material. This article is a clinical report of a patient who presented with an anterior flabby maxillary edentulous ridge opposing the remaining anterior natural teeth. A custom double tray was fabricated using the principle of the window technique. The gap between the double trays allows mucostatic impressions of flabby ridge tissue to be made with accuracy. The maxillary single denture, which was made with a custom double tray, satisfied the patient.

show abstract

Effects of relief space and escape holes on pressure characteristics of maxillary edentulous impressions

Cited by 19 publications

References 15 publications

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

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

A cross-over Randomised Controlled Trial of selective pressure impressions for lower complete dentures

Custom double tray for a special impression technique for flabby maxillary residual ridge: Case report

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