Digital Impression Systems, CAD/CAM, and STL file

2020 ◽  
pp. 27-63
Author(s):  
Bálint Vecsei ◽  
Alexandra Czigola ◽  
Ivett Róth ◽  
Peter Hermann ◽  
Judit Borbély
Keyword(s):  
Digital Impression ◽  
Stl File ◽  
Cad Cam

scholarly journals The Use of a CAD/CAM Surgical Obturator Without Impressions to Restore a Maxillectomy Defect

2021 ◽  
Vol 6 ◽  
pp. 247275122199297
Author(s):  
Nicholas Callahan ◽  
Sarah L. Moles ◽  
Michael R. Markiewicz
Keyword(s):  
Surgical Planning ◽  
Tumor Resection ◽  
Free Tissue Transfer ◽  
Digital Impression ◽  
Head And Neck Reconstruction ◽  
Autologous Reconstruction ◽  
Form And Function ◽  
Virtual Surgical Planning ◽  
Tissue Transfer ◽  
Cad Cam

Immediate obturation of the patient undergoing maxillectomy who is not undergoing formal autologous reconstruction is important for immediate form and function of the patient. Exophytic tumors, that are large in dimension can make pre-operative obturator formation challenging. Traditional methods of obturator fabrication involve a physical or digital impression. Preoperative virtual surgical planning for tumor resection and reconstruction using free tissue transfer has become a mainstay in head and neck reconstruction. We describe a variation of this for a patient unable to undergo free tissue transfer where the authors used preoperative virtual surgical planning and CAD/CAM technologies to perform tumor resection, and fabricated an obturator based on the CT imaging alone.

Digital Impression Devices and CAD/CAM Systems

2018 ◽  
pp. 1386-1407
Author(s):  
Nathan S. Birnbaum ◽  
Heidi B. Aaronson
Keyword(s):  
Digital Impression ◽  
Cad Cam ◽  
Cam Systems

Digital impression and jaw relation record for the fabrication of CAD/CAM custom tray

2018 ◽  
Vol 62 (4) ◽  
pp. 509-513 ◽  
Author(s):  
Manabu Kanazawa ◽  
Maiko Iwaki ◽  
Toshio Arakida ◽  
Shunsuke Minakuchi
Keyword(s):  
Digital Impression ◽  
Cad Cam

scholarly journals Clinical Acceptability of the Internal Gap of CAD/CAM PD-AG Crowns Using Intraoral Digital Impressions

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Tae-Gyung Kim ◽  
Sungtae Kim ◽  
Hyunmin Choi ◽  
Jae-Hoon Lee ◽  
Jae-Hong Kim ◽  
...  
Keyword(s):  
Digital Impression ◽  
Digital Impressions ◽  
Significant Difference ◽  
Cad Cam ◽  
Cast Group ◽  
Group 10 ◽  
Internal Gap ◽  
Conventional Impression ◽  
Palladium Silver

The purpose of this study was to compare the internal gap between CAD/CAM palladium-silver crowns and cast gold crowns generated from intraoral digital versus conventional impressions and to determine the clinical acceptability. Nickel-chrome master dies were made from the prepared resin tooth with the conventional impression method (n=40). For ICC (Intraoral, CAD/CAM) group, 10 intraoral digital impressions were made, and 10 CAD/CAM crowns of a PD-AG (palladium-silver) machinable alloy were generated. For IC (Intraoral, Cast) group, 10 gold crowns were cast from ten intraoral digital impressions. For CCC (Conventional, CAD/CAM) group, 10 CAD/CAM PD-AG crowns were made using the conventional impression method. For CC (Conventional, Cast) group, 10 gold crowns were fabricated from 10 conventional impressions. One hundred magnifications of the internal gaps of each crown were measured at 50 points with an optical microscope and these values were statistically analyzed using a two-way analysis of variance (α=0.05). The internal gap of the intraoral digital impression group was significantly larger than in the conventional impression group (P<0.05). No significant difference was observed between the CAD/CAM group and the cast group (P>0.05). Within the limitations of this in vitro study, crowns from intraoral digital impressions showed larger internal gap values than crowns from conventional impressions.

scholarly journals In vitro study of marginal, internal and proximal adaptation of implant-supported single-crown CAD/CAM restorations

2020 ◽  
Vol 19 ◽  
pp. e207286
Author(s):  
Kamila Aguiar Figueiredo Alves ◽  
Janaina Emanuela Damasceno ◽  
Viviane Maia Barreto de Oliveira ◽  
Luiz Gustavo Cavalcanti Bastos ◽  
Andrea Nóbrega Cavalcanti
Keyword(s):  
Repeated Measures ◽  
T Test ◽  
Digital Impression ◽  
Single Crown ◽  
Significant Difference ◽  
Cad Cam ◽  
Student’S T ◽  
One Way Anova ◽  
Student’S T Test

Aim: This study evaluated the precision of a CAD/CAM system by measuring marginal, internal and proximal fits in implantsupported single-crown restorations. Methods: Ten models of the upper arch were made in which implants replaced the upper left premolars. For fabrication of the zirconia infrastructures, titanium bases (TiBase) were coded and scanned using a scan body. A second digital impression was made for the fabrication of prostheses. Silicone impression material was used to determine the internal clearance between the TiBase and infrastructure and between the infrastructure and crown, whose thickness was measured at three points [P1 (cervical), P2 (middle) and P3 (occlusal)] with a stereoscopic microscope at 70x and 100x magnification. One-way ANOVA for repeated measures and the Student t-test were used for the analysis of internal and marginal adaptation. Proximal contacts were analyzed qualitatively. Results: There was no significant difference between the teeth evaluated (Student’s t-test; p>0.05) or between the corresponding points evaluated in either tooth (one-way ANOVA; p>0.05). Analysis of the internal clearance between the infrastructure and crown demonstrated that all points were significantly different compared to the reference standardized at 100 μm (Student’s t-test p<0.0001). There was no significant difference between P1 and P2, with the thickness at these two points being lower than that obtained at P3 (one-way ANOVA, p<0.05). The proximal contacts did not coincide with the quality defined by the device. Conclusion: The system tested was unable to produce implantsupported single-crown ceramic restorations with marginal, internal and proximal fits matching the digital workflow, with the inferior fits requiring adjustment prior to cementation.

scholarly journals Combining Intraoral and Face Scans for the Design and Fabrication of Computer-Assisted Design/Computer-Assisted Manufacturing (CAD/CAM) Polyether-Ether-Ketone (PEEK) Implant-Supported Bars for Maxillary Overdentures

Scanning ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Francesco Mangano ◽  
Carlo Mangano ◽  
Bidzina Margiani ◽  
Oleg Admakin
Keyword(s):  
Soft Tissues ◽  
Previous Treatment ◽  
Digital Impression ◽  
Computer Assisted ◽  
Success Rates ◽  
Computer Assisted Design ◽  
Polyether Ether Ketone ◽  
Cad Cam ◽  
Passive Fit ◽  
Ether Ketone

Purpose. To present a digital method that combines intraoral and face scanning for the computer-assisted design/computer-assisted manufacturing (CAD/CAM) fabrication of implant-supported bars for maxillary overdentures. Methods. Over a 2-year period, all patients presenting to a private dental clinic with a removable complete denture in the maxilla, seeking rehabilitation with implants, were considered for inclusion in this study. Inclusion criteria were fully edentulous maxilla, functional problems with the preexisting denture, opposing dentition, and sufficient bone volume to insert four implants. Exclusion criteria were age<55 years, need for bone augmentation, uncompensated diabetes mellitus, immunocompromised status, radio- and/or chemotherapy, and previous treatment with oral and/or intravenous aminobisphosphonates. All patients were rehabilitated with a maxillary overdenture supported by a CAD/CAM polyether-ether-ketone (PEEK) implant-supported bar. The outcomes of the study were the passive fit/adaptation of the bar, the 1-year implant survival, and the success rates of the implant-supported overdentures. Results. 15 patients (6 males, 9 females; mean age 68.8±4.7 years) received 60 implants and were rehabilitated with a maxillary overdenture supported by a PEEK bar, designed and milled from an intraoral digital impression. The intraoral scans were integrated with face scans, in order to design each bar with all available patient data (soft tissues, prosthesis, implants, and face) in the correct spatial position. When testing the 3D-printed resin bar, 12 bars out of 15 (80%) had a perfect passive adaptation and fit; in contrast, 3 out of 15 (20%) did not have a sufficient passive fit or adaptation. No implants were lost, for a 1-year survival of 100% (60/60 surviving implants). However, some complications (two fixtures with peri-implantitis in the same patient and two repaired overdentures in two different patients) occurred. This determined a 1-year success rate of 80% for the implant-supported overdenture. Conclusions. In this study, the combination of intraoral and face scans allowed to successfully restore fully edentulous patients with maxillary overdentures supported by 4 implants and a CAD/CAM PEEK bar. Further studies are needed to confirm these outcomes.

Comparison of digital scanning and conventional impression taking for implant-supported prostheses

2021 ◽  
pp. 44-49
Author(s):  
R. V. Studenikin ◽  
A. A. Mamedov
Keyword(s):  
Clinical Performance ◽  
Preparation Time ◽  
Stl File ◽  
Scanning Technique ◽  
Digital Scanning ◽  
Cad Cam ◽  
Implant Restoration ◽  
Conventional Impression ◽  
Single Implant ◽  
Plaster Casts

The effect of discrepancies between digital scans and conventional impressions on the clinical performance of a permanent restoration has not been fully understood.Thirty patients received conventional impressions and digital scans of a single implant restoration. Two crowns were made for the same implant using both methods. The time taken for each procedure was recorded. After analyzing the accuracy and effectiveness of both crowns, the best one was placed. A questionnaire was conducted to assess the preferences and comfort when using crowns made by one method or another.The total time for the traditional impression technique was 15 minutes, while the time for the digital scanning technique was significantly less – 10 minutes.The preparation time, including the disinfection of the silicone impressions, their transportation to the laboratory, the casting of the impressions, the hardening of the plaster, as well as the preparation of the model by the technician, was 4 hours for conventional impressions.The timing for sending the STL file and modeling the structure was less than 2 hours for the digital scan method. The production time of crowns takes 3 hours for both conventional impressions and digital ones.Of all crowns selected for placement, 46.7% were made from conventional impressions and 53.3% from digital scans. Participants preferred the digital scanning technique (89%) over the traditional impression-taking technique (11%).The data from this study suggest that digital scanning and CAD/CAM technology may be more effective and better accepted by study par-ticipants for a single implant restoration than conventional impressions and plaster casts.

scholarly journals Digital Device in Postextraction Implantology: A Clinical Case Presentation

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
A. E. Borgonovo ◽  
F. Rigaldo ◽  
D. Battaglia ◽  
D. Re ◽  
A. B. Giannì
Keyword(s):  
Healing Process ◽  
Root Surface ◽  
Digital Impression ◽  
Intraoral Scanner ◽  
Impression Materials ◽  
Cad Cam ◽  
Dental Impression ◽  
Immediate Implant ◽  
Scanned Images ◽  
Implant System

Aim. The aim of this work is to describe a case of immediate implant placement after extraction of the upper right first premolar, with the use of CAD/CAM technology, which allows an early digital impression of the implant site with an intraoral scanner (MHT 3D Progress, Verona, Italy).Case Report. A 46-year-old female was referred with a disorder caused by continuous debonding of the prosthetic crown on the upper right first premolar. Clinically, there were no signs, and the evaluation of the periapical radiograph showed a fracture of the root, with a mesial well-defined lesion of the hard tissue of the upper right first premolar, as the radiolucent area affected the root surface of the tooth. It was decided, in accordance with the patient, that the tooth would be extracted and the implant (Primer, Edierre implant system, Genoa, Italy) with diameter of 4.2 mm and length of 13 mm would be inserted. After the insertion of the implant, it was screwed to the scan abutment, and a scan was taken using an intraoral scanner (MHT 3D Progress, Verona, Italy). The scanned images were processed with CAD/CAM software (Exocad DentalCAD, Darmstadt, Germany) and the temporary crown was digitally drawn (Dental Knowledge, Milan, Italy) and then sent to the milling machine for production with a composite monoblock. After 4 months, when the implant was osteointegrated, it was not necessary to take another dental impression, and the definitive crown could be screwed in.Conclusion. The CAD/CAM technology is especially helpful in postextraction implant for aesthetic rehabilitation, as it is possible to immediately fix a provisional crown with an anatomic shape that allows an optimal healing process of the tissues. Moreover, the removal of healing abutments, and the use of impression copings, impression materials, and dental stone became unnecessary, enabling the reduction of the chair time, component cost, and patient’s discomfort. However, it is still necessary for scientific research to continue to carry out studies on this procedure, in order to improve the accuracy, the reliability, and the reproducibility of the results.

Accuracy of Ceramic Restorations Made Using an In-office Optical Scanning Technique: An In Vitro Study

2014 ◽  
Vol 39 (3) ◽  
pp. 308-316 ◽  
Author(s):  
P Tidehag ◽  
K Ottosson ◽  
G Sjögren
Keyword(s):  
Glass Ceramic ◽  
In Vitro Study ◽  
Vitro Study ◽  
Digital Impression ◽  
All Ceramic ◽  
Computer Aided ◽  
Cad Cam ◽  
Ceramic Crowns ◽  
Ceramic Crown

SUMMARY The present in vitro study concerns determination of the pre-cementation gap width of all-ceramic crowns made using an in-office digital-impression technique and subsequent computer-aided design/computer-aided manufacturing (CAD/CAM) production. Two chairside video camera systems were used: the Lava Oral scanner and Cadent's iTero scanner. Digital scans were made of a first molar typodont tooth that was suitably prepared for an all-ceramic crown. The digital impressions were sent via the Internet to commercial dental laboratories, where the crowns were made. Also, an impression of the typodont tooth was made, poured, and scanned in order to evaluate the pre-cementation gap of crowns produced from scanning stone dies. These methods and systems were evaluated by creating replicas of the intermediate space using an addition-cured silicone, and the gap widths were determined using a measuring microscope. Hot-pressed leucite-reinforced glass-ceramic crowns were selected as a reference. The mean value for the marginal measuring points of the control was 170 μm, and the values for all the evaluated crowns ranged from 107 to 128 μm. Corresponding figures for the internal measuring points were 141-210 μm and 115-237 μm, respectively. Based on the findings in the present study, an in-office digital-impression technique can be used to fabricate CAD/CAM ceramic single crowns with a marginal and internal accuracy that is on the same level as that of a conventional hot-pressed glass-ceramic crown. In the present study, however, slight differences could be seen between the two types of ceramic crowns studied with respect to the internal fit obtained.

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