A single procedure for the registration of maxillo-mandibular relationships and alignment of intraoral scans of edentulous maxillary and mandibular arches

A systematic review of digital removable partial dentures. Part I: Clinical evidence, digital impression, and maxillomandibular relationship record

“…Border modeling is usually performed to determine the outline of the denture base in conventional impression-taking. In this systematic review, the majority of cases that used IOSs for digital impression-taking were those with Kennedy Class III/IV arches [19-21, 23-25, 29, 31, 32], while a few case reports involved Kennedy Class I/II arches [27,30,52]. Digital impression-taking without border modeling may be clinically acceptable in cases of Kennedy Class III/IV arches with a small number of missing teeth.…”

“…In 12 articles that included 13 digital RPD cases [19-21, 23-25, 27, 29, 30-32, 52], digital data of definitive impressions of the partially edentulous arch were acquired using IOSs to fabricate RPDs. The models of the IOSs utilized in those articles were as follows: TRIOS (3Shape, Copenhagen, Denmark) [25,27,29,[30][31][32]52], CEREC Omnicam (Dentsply Sirona, Charlotte, NC, USA) [23,24], Cadent iTero (Align Technology, San Jose, CA, USA) [19] (Table 4). In most of these articles, digital impressions were utilized for Kennedy Class III and IV partially edentulous patients [19-21, 23-25, 29, 31, 32].…”

“…In most of these articles, digital impressions were utilized for Kennedy Class III and IV partially edentulous patients [19-21, 23-25, 29, 31, 32]. On the other hand, three articles described a clinical application of the digital impression for Kennedy Class I partially edentulous patients [27,30,52]. In ten articles, the adjustment of frameworks, arrangement of artificial teeth, and completion of denture bases were processed on 3D-printed resin or polyurethane casts [19-21, 23-25, 29, 30-32].…”

“…In two of these cases [19,21], metal frameworks were fabricated using the data acquired from digital impressions and MMR records, and they were used for a definitive MMR record to mount definitive casts on a physical articulator for the arrangement of artificial teeth. In two patients with Kennedy Class I partially edentulous arches [27,52], the MMR was supported by record bases during digital MMR recording. Typically, the images of teeth and gingiva were captured from a buccal view using an IOS during digital MMR recording, and the maxillary and mandibular digital models were mounted on virtual articulators.…”

“…Typically, the images of teeth and gingiva were captured from a buccal view using an IOS during digital MMR recording, and the maxillary and mandibular digital models were mounted on virtual articulators. However, descriptions of digital MMR recordings varied among articles and included capturing the teeth and occlusion [19], digital buccal interocclusal record [20], buccal "bite" [21], occlusal registration [24], two vestibular records, as recommended by the manufacturer [25], a record of the interocclusal relation (occlusal scan) [27], details of the teeth and occlusion [30], teeth in occlusion [31], bite registration [32], and scanning of the right and left occlusal relationship according to the scanning workflow [52]. In these articles, no details related to scanning the teeth and area were described.…”