Effect of half-digital workflows on the adaptation of custom CAD-CAM composite post-and-cores

Perucelli, Fabricio; Costa, Rogério Goulart da; Souza, Evelise Machado de; Rached, Rodrigo Nunes

doi:10.1016/j.prosdent.2020.08.014

Cited by 25 publications

(26 citation statements)

References 25 publications

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“…As for the adaptation of the post-core, the cement thickness of the CAD/CAM resin post-core has been greater than that of the metal post-core [ 17 ]. The cement thickness of TRINIA at the apical region possibly become greater than that of the fiber post because of the scanning difficulty.…”

Section: Discussionmentioning

confidence: 99%

Fabricated CAD/CAM Post-Core Using Glass Fiber-Reinforced Resin Shows Innovative Potential in Restoring Pulpless Teeth

et al. 2021

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The prevention of root fractures of pulpless teeth is an important clinical issue to maintain healthy teeth through lifetime. The aim of this study was to examine a clinically effective treatment method for strengthening vulnerable pulpless teeth using CAD/CAM (computer-aided design/computer-aided manufacturing) fiber-reinforced post-core by conducting a fracture resistance test. A post-core made with a fiber-reinforced resin disk TRINIA (TR, SHOFU, Kyoto, Japan) was fabricated using a CAD/CAM system. The fiber-layer orientation of the CAD/CAM post-core was parallel to the axis of the restored tooth. A post-core using a conventional composite and a fiber post (CF) was also prepared. A fracture resistance test of teeth restored with the post-cores and zirconia crowns was conducted using a universal testing machine, and fracture patterns were identified by micro-CT observation. The fracture load of the roots restored with TR was 1555.9 ± 231.8 N, whereas that of CF was 1082.1 ± 226.7 N. The fracture load of TR was 43.8% that was significantly higher than that of CF (Student’s t-test, p < 0.05). The restored teeth with CAD/CAM resin post-core were found to be repairable even after fracture. These results suggest that the CAD/CAM indirect fiber post-core has the potential to strengthen the vulnerable pulpless teeth.

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Section: Discussionmentioning

confidence: 99%

Fabricated CAD/CAM Post-Core Using Glass Fiber-Reinforced Resin Shows Innovative Potential in Restoring Pulpless Teeth

et al. 2021

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“…Furthermore, the round-ended milling burs used for fabricating CAD-CAM post and cores cannot accurately reproduce sharp angles at the junction between core and post, thus; clinicians must prepare rounded internal angles to avoid cervical misfits. (21,22) Accordingly, the reason for this result could have contributed to software trimming that is related to the anatomical configuration of the canal. (14) On the other hand, regarding group II (Pressed group), the mean cement thickness was the highest in the middle section (50.99mm±15.98), followed by the coronal section (39.70mm±18.16), the apical section (21.37mm±4.30).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Internal Fit of Pressable Versus Cad/Cam Peek Post and Core Using Scanning Electron Microscope: An in Vitro Study

Naddar

Hamdy

Taymour³

2022

Egyptian Dental Journal

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Aim:The study was conducted to evaluate the internal fit and marginal adaptation of custommade Pressable compared to CAD/CAM PEEK post and core at three levels.Methodology: Twenty-eight extracted maxillary central incisors were prepared for custom post and cores. Acrylic resin patterns were fabricated and divided into two groups: CAD/CAM group: The resin patterns were directly scanned and milled from modified PEEK blocks and Press group: Patterns were pressed with PEEK granules. The cement thickness was measured at four standardized points and the vertical marginal discrepancy was measured at twelve points using scanning electron microscope. One Way-ANOVA and Tukey`s post hoc test were performed to compare between the sections of each group; while Independent T-test was performed to compare between the two groups at different sections.Results: Regarding CAD/CAM group, the mean cement thickness was the highest in the coronal section (85.57±17.81) followed by the middle (72.87±18.57) then the apical (45.92±18.73). While for Press group, the middle section showed the highest mean cement thickness (50.99±15.98), followed by the coronal section (39.70±18.16), the apical section (21.37±4.30). Comparing the two groups, CAD/CAM group had a significantly higher internal gap in all sections (P=0.0001). Among cores marginal adaptation, no significant difference in means of all surfaces was revealed between the CAD/CAM (98.83±13.90) and press (95.08±13.91) groups (P=0.54) Conclusion: Within the limitations of this study, pressed PEEK post and cores achieved superior internal fit compared to CAD/CAM. Neither CAD/CAM nor pressing technique influenced the marginal adaptation of PEEK cores and both were within the clinical acceptance range.

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“…Another method had been proposed, which includes a local impression of the root canal and its optical scanning, dentition optical scanning, splicing of the two optical impressions, CAD, and digital processing. Apart from the initial postimpression collection, this method has a higher degree of digitalization in other steps [20]. The current research investigates the applications of these two digital processing for posts and cores.…”

Section: Discussionmentioning

confidence: 99%

“…Compared with the traditional lost-wax casting method, semidigital scanning impression technology needs to add the intermediate steps of collecting and scanning the impression and rotating the 3D dimensional structure, but the current ndings still support the use of high-quality impression materials and detailed laboratory procedures to obtain better adaptive parameters than through direct wax-mold fabrication [20]. The reasons for such results are as follows: All procedures using scanning impression technology, except the impression collection, depend on digital means to be completed with great accuracy, repeatability, and reduction of human impact.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of custom posts and cores fabricated by two digital technologies in core and post space dimensions

Wang

et al. 2022

Preprint

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Objectives To evaluate the adaptability between posts and post spaces and the rationality of cores fabricated by two digital custom posts and cores processes. Materials and methods Titanium posts and cores were fabricated by digital scanning impression technology or digital scanning wax-pattern technology on tooth defect molds of incisors, premolars, and molars, with traditional lost-wax casts of these teeth as the controls. Micro-CT and a laboratory scanner were used to determine intervals between post wall and root canal wall of the root apex, middle, and cervix of each sample in cross-, sagittal, and coronal sections; intervals between the end of post and tooth; diameters of cervical, middle, and incisal part at cross-, sagittal, and coronal sections of each sample, as well as shoulder widths. Results Three fabrication processes showed significant differences in intervals between post-and-core prostheses and root canal wall, diameters of all parts of cores, and shoulder widths. Scanning impression showed significant advantages in the main part of posts and cores in incisors and premolars, while the scanning wax-pattern process showed obvious inferiorities in premolars and molars. As to core spatial size, values of measured sites in the scanning impression process were closer to the standard than those of the traditional process, while differences between the measured value of the scanning wax-pattern process were much more obvious than in the traditional process. Conclusion The digital custom posts and cores employed scanning impression improved rationality and precision of post-and-core dimensions compared with the two other processes. Clinical relevance Fabrication using digital design and processing for custom posts and cores has better precision and adaptability.

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Effect of half-digital workflows on the adaptation of custom CAD-CAM composite post-and-cores

Cited by 25 publications

References 25 publications

Fabricated CAD/CAM Post-Core Using Glass Fiber-Reinforced Resin Shows Innovative Potential in Restoring Pulpless Teeth

Fabricated CAD/CAM Post-Core Using Glass Fiber-Reinforced Resin Shows Innovative Potential in Restoring Pulpless Teeth

Evaluation of the Internal Fit of Pressable Versus Cad/Cam Peek Post and Core Using Scanning Electron Microscope: An in Vitro Study

Evaluation of custom posts and cores fabricated by two digital technologies in core and post space dimensions

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