PMID- 36676569
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20230201
IS  - 1996-1944 (Print)
IS  - 1996-1944 (Electronic)
IS  - 1996-1944 (Linking)
VI  - 16
IP  - 2
DP  - 2023 Jan 15
TI  - Comparison of Milled Full-Arch Implant-Supported Frameworks Realised with a Full 
      Digital Workflow or from Conventional Impression: A Clinical Study.
LID - 10.3390/ma16020833 [doi]
LID - 833
AB  - BACKGROUND: The aim of the present study was to investigate the accuracy of a new 
      digital impression system, comparing it to the plaster impression technique in 
      the realization of full-arch implant-supported metal frameworks. METHODS: We took 
      11 scans (8 of the upper maxilla and 3 of the lower jaw) on a sample of nine 
      patients previously rehabilitated with fixed full-arch screw-retained prostheses 
      following the Columbus Bridge Protocol (CBP) with four to six implants (total: 
      51) since at least 4 months. Two impressions were taken for each dental arch: one 
      analogic plaster impression using pick-up copings and an open tray technique and 
      a second one using an intra-oral scanner. Two milled metal substructures were 
      realised. The precision and passivity of the substructures were clinically 
      analysed through the Sheffield test and endo-oral radiographs. Laboratory scans 
      of the plaster casts obtained from an intra-oral scanner (IOS) and of the plaster 
      casts obtained from traditional impression were compared with the intraoral scans 
      following Hausdorff's method and an industrial digital method of optical 
      detection to measure discrepancies. A Mann-Whitney test was performed in order to 
      investigate average distances between surfaces after the superposition. RESULTS: 
      The Sheffield test demonstrated an excellent passivity of the frameworks obtained 
      through both the digital and the analogic method. In 81.81% of cases (n = 9) both 
      substructures were found to have a perfect fit with excellent passivity, while in 
      18.18% (n = 2) of cases the substructures were found to have a very slight 
      discrepancy. From the radiographic examination, no gaps between the frameworks 
      and the implant heads or multiunit abutments were observed, with 100% accuracy. 
      By superimposing digital files of scans according to Hausdorff's method, a 
      statistically significant discrepancy (p = 0.006) was found between the digital 
      scans and the digital models obtained from plaster impressions. Three-dimensional 
      optical detection found a mean discrepancy of 0.11 mm between the analogic cast 
      and the cast derived from the digital impression. CONCLUSIONS: The present study 
      clinically demonstrates that milled implant-supported full-arch frameworks 
      obtained through a digital scan and the herein described technique have an 
      accuracy comparable to those obtained with traditional plaster impression.
FAU - Pera, Francesco
AU  - Pera F
AD  - C.I.R. Dental School, Department of Surgical Sciences, University of Turin, 10126 
      Turin, Italy.
FAU - Pesce, Paolo
AU  - Pesce P
AUID- ORCID: 0000-0001-8726-4145
AD  - Department of Surgical Sciences (DISC), University of Genoa, 16132 Genoa, Italy.
FAU - Bagnasco, Francesco
AU  - Bagnasco F
AD  - Department of Surgical Sciences (DISC), University of Genoa, 16132 Genoa, Italy.
FAU - Pancini, Nicolo
AU  - Pancini N
AD  - Department of Surgical Sciences (DISC), University of Genoa, 16132 Genoa, Italy.
FAU - Carossa, Massimo
AU  - Carossa M
AUID- ORCID: 0000-0001-9495-1832
AD  - C.I.R. Dental School, Department of Surgical Sciences, University of Turin, 10126 
      Turin, Italy.
FAU - Baldelli, Lorenzo
AU  - Baldelli L
AD  - Department of Surgical Sciences (DISC), University of Genoa, 16132 Genoa, Italy.
FAU - Annunziata, Marco
AU  - Annunziata M
AUID- ORCID: 0000-0003-4605-2087
AD  - Multidisciplinary Department of Medical-Surgical and Dental Specialties, 
      University of Campania "Luigi Vanvitelli", 81100 Caserta, Italy.
FAU - Migliorati, Marco
AU  - Migliorati M
AUID- ORCID: 0000-0001-8671-3025
AD  - Department of Surgical Sciences (DISC), University of Genoa, 16132 Genoa, Italy.
FAU - Baldi, Domenico
AU  - Baldi D
AD  - Department of Surgical Sciences (DISC), University of Genoa, 16132 Genoa, Italy.
FAU - Menini, Maria
AU  - Menini M
AUID- ORCID: 0000-0001-6503-1201
AD  - Department of Surgical Sciences (DISC), University of Genoa, 16132 Genoa, Italy.
LA  - eng
GR  - Mech & Human/
PT  - Journal Article
DEP - 20230115
PL  - Switzerland
TA  - Materials (Basel)
JT  - Materials (Basel, Switzerland)
JID - 101555929
PMC - PMC9861382
OTO - NOTNLM
OT  - accuracy
OT  - dental implants
OT  - digital impression
OT  - full-arch
OT  - intraoral scanner
COIS- The authors declare no conflict of interest.
EDAT- 2023/01/22 06:00
MHDA- 2023/01/22 06:01
PMCR- 2023/01/15
CRDT- 2023/01/21 01:36
PHST- 2022/11/25 00:00 [received]
PHST- 2023/01/10 00:00 [revised]
PHST- 2023/01/12 00:00 [accepted]
PHST- 2023/01/21 01:36 [entrez]
PHST- 2023/01/22 06:00 [pubmed]
PHST- 2023/01/22 06:01 [medline]
PHST- 2023/01/15 00:00 [pmc-release]
AID - ma16020833 [pii]
AID - materials-16-00833 [pii]
AID - 10.3390/ma16020833 [doi]
PST - epublish
SO  - Materials (Basel). 2023 Jan 15;16(2):833. doi: 10.3390/ma16020833.