Digital Workflow for Establishing the Posterior Palatal Seal on a Digital Complete Denture

Abstract

The posterior palatal seal (PPS) plays important roles in improving denture retention, preventing food and debris from entering under the denture base, reducing the gag reflex, providing more strength across the denture, and making the distal border less noticeable to the tongue. Digital dentures have become popular, owing to the use of computer‐aided design and computer‐aided manufacturing and rapid prototyping technologies. However, limited research has been conducted on a digital workflow to establish the PPS. This article presents a technique to establish the PPS by using digital technologies for providing the advantages of the PPS to patients wearing digital dentures.

Comparison of tissue displacement in edentulous arches among three‐dimensional files obtained through different impression‐making methods: A retrospective study

“…PPS subgroups in the maxillary arches were selected because they are essential in achieving intimate contact with maxillary complete dentures. 40 As mentioned previously, the superimposition of the two scan datasets yields a single outcome. This indicates that the scan datasets' relative positions are only meaningful and have constant values.…”

Digital beading for a CAD–CAM framework for an implant‐supported overdenture: A dental technique

“…The designing approach follows accurate bead line dimensions and can be considered a novel application of digital technology. The open architecture of intraoral digital scanning combined with CAD‐CAM systems can aid in modifying the STL file to perform digital sculpting of the posterior palatal seal for CAD‐CAM complete dentures 11 or for creating digital bead lines for maxillary reduced palatal coverage implant‐supported overdenture in this presented digital technique and concept.…”

A guide for maximizing the accuracy of intraoral digital scans. Part 1: Operator factors

“…29,30,[36][37][38][39][40] Therefore, for fabricating complete dentures or Kennedy Class I and II removable partial dentures, digitizing conventional impressions by using IOSs have been recommended. 29,30,[36][37][38][39][40] Similarly, complete-arch scans by using IOSs for fabricating complete-arch tooth-and implant-supported rehabilitations have shown contradictory results in the literature regarding reliability and accuracy. [31][32][33][34][35]41,42 Different techniques have been described to improve the scanning accuracy of complete-arch implant digital scans; however, due to the limited clinical data published, a systematic recommendation of complete-arch implant digital scans by using IOSs is difficult.…”

“…30 Published studies have shown that intraoral digital scans can accurately digitized edentulous areas with firm attached tissue and mucosa, but capturing areas with mobile tissue by using an IOS is challenging, regardless of the scanning technology and system elected. 29,30,[36][37][38][39][40] Therefore, for fabricating complete dentures or Kennedy Class I and II removable partial dentures, digitizing conventional impressions by using IOSs have been recommended. 29,30,[36][37][38][39][40] Similarly, complete-arch scans by using IOSs for fabricating complete-arch tooth-and implant-supported rehabilitations have shown contradictory results in the literature regarding reliability and accuracy.…”

“…The challenge today remains to incorporate IOSs into complete digital workflows for fabricating complete dentures 29 and Kennedy Class I and II removable partial dentures 30 . Published studies have shown that intraoral digital scans can accurately digitized edentulous areas with firm attached tissue and mucosa, but capturing areas with mobile tissue by using an IOS is challenging, regardless of the scanning technology and system elected 29,30,36–40 . Therefore, for fabricating complete dentures or Kennedy Class I and II removable partial dentures, digitizing conventional impressions by using IOSs have been recommended 29,30,36–40 …”