Establishing the posterior palatal seal during the final impression stage

Ansari, Izharul Haque

doi:10.1016/s0022-3913(97)70034-9

Cited by 16 publications

(20 citation statements)

References 9 publications

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“…Before the introduction of CAD/CAM technology into removable prosthodontics, the congruence between denture base and denture-bearing tissues was always impeded by the resin's polymerisation shrinkage [7]. The shrinkage causes distortions of the denture base and therefore has a negative impact on fit and retention of removable complete dentures [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

CAD/CAM produces dentures with improved fit

et al. 2018

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Objectives Resin polymerisation shrinkage reduces the congruence of the denture base with denture-bearing tissues and thereby decreases the retention of conventionally fabricated dentures. CAD/CAM denture manufacturing is a subtractive process, and polymerisation shrinkage is not an issue anymore. Therefore, CAD/CAM dentures are assumed to show a higher denture base congruence than conventionally fabricated dentures. It has been the aim of this study to test this hypothesis. Materials and methods CAD/CAM dentures provided by four different manufacturers (AvaDent, Merz Dental, Whole You, Wieland/Ivoclar) were generated from ten different master casts. Ten conventional dentures (pack and press, long-term heat polymerisation) made from the same master casts served as control group. The master casts and all denture bases were scanned and matched digitally. The absolute incongruences were measured using a 2-mm mesh. Results Conventionally fabricated dentures showed a mean deviation of 0.105 mm, SD = 0.019 from the master cast. All CAD/ CAM dentures showed lower mean incongruences. From all CAD/CAM dentures, AvaDent Digital Dentures showed the highest congruence with the master cast surface with a mean deviation of 0.058 mm, SD = 0.005. Wieland Digital Dentures showed a mean deviation of 0.068 mm, SD = 0.005, Whole You Nexteeth prostheses showed a mean deviation of 0.074 mm, SD = 0.011 and Baltic Denture System prostheses showed a mean deviation of 0.086 mm, SD = 0.012. Conclusions CAD/CAM produces dentures with better fit than conventional dentures. Clinical Relevance The present study explains the clinically observed enhanced retention and lower traumatic ulcer-frequency in CAD/CAM dentures.

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Section: Introductionmentioning

confidence: 99%

CAD/CAM produces dentures with improved fit

et al. 2018

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“…The record base itself can feature a post dam on its posterior end without using a third material when a postpalatal seal is established physiologically on a final impression 8 . This technique, however, requires numerous instruments, multiple seatings of the impression in the mouth, and cooperation of the patient.…”

Section: Discussionmentioning

confidence: 99%

“…The record base itself can feature a post dam on its posterior end without using a third material when a postpalatal seal is established physiologically on a final impression. 8 This technique, however, requires numerous instruments, multiple seatings of the impression in the mouth, and cooperation of the patient. The common errors with this method (insufficient and/or excessive compressions along the postpalatal seal area) may also relate to the relative rigidity or resiliency of the impression material used.…”

Section: Discussionmentioning

confidence: 99%

Modified Record Base Featuring Postpalatal Seal Using Silicone Bite Registration Material

Saglik

2011

Journal of Prosthodontics

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This article describes a simple method of fabricating a stable and retentive record base to ensure an accurate registration of the maxillomandibular relationship. A postpalatal seal is established along the posterior end of the record base on the definitive cast using a silicone bite registration material to create a border seal along with the lip/cheek draping actions and to evaluate adequacy of the post dam.

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“…It was carved to the depth of approximately 1 to 1.5 mm. [1] sustained that the tissue covering the median palatal raphe has thin mucosa and cannot resist the same compressive force as the tissues lateral to it. So, [3] recommended to scrape this area to a depth of approximately 0.5 to 1.0 mm.…”

Section: Scraping the Cast For Establishing The Ppsmentioning

confidence: 99%

“…Whereas the form of the anterior alveolar bone may resist the deformation when the denture is removed from its cast [9]. Providing sufficient posterior palatal seal (PPS) of a maxillary denture is necessary for retention [7,1]. The PPS area has been defined as ''the soft tissue area at or beyond the junction of the hard and soft palates on which pressure, within physiologic limits, can be applied by a complete denture prosthesis to aid in retention'' [26].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the conventional method for establishing the posterior palatal seal

Salloum

2012

King Saud University Journal of Dental Sciences

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Objective: Providing sufficient posterior palatal seal (PPS) of a maxillary denture is necessary for retention. This research was designed to estimate the arbitrary scraping method used for establishing the PPS.Methods and material: Eight complete edentulous patients were selected. They received conventional complete dentures by using a scraping method for establishing the PPS. The posterior retention of the maxillary dentures was measured, the postpalatal area for each patient was visually estimated, and smears were made from the postpalatal areas at insertion appointment, 7, 30, and 90 days after denture placement.Result: The study revealed that the posterior retention of the maxillary dentures did not change during the stages of the study, and the epithelium of the postpalatal area converted gradually to a keratinized one.Conclusion: It is concluded that the scraping method used for establishing the PPS is an effective and safe technique.

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Establishing the posterior palatal seal during the final impression stage

Cited by 16 publications

References 9 publications

CAD/CAM produces dentures with improved fit

CAD/CAM produces dentures with improved fit

Modified Record Base Featuring Postpalatal Seal Using Silicone Bite Registration Material

Evaluation of the conventional method for establishing the posterior palatal seal

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