Comparing accuracy of denture bases fabricated by injection molding, CAD/CAM milling, and rapid prototyping method

Lee, Suji; Hong, Seoung‐Jin; Paek, Janghyun; Pae, Ahran; Kwon, Kung‐Rock; Noh, Kwantae

doi:10.4047/jap.2019.11.1.55

Cited by 83 publications

(88 citation statements)

References 32 publications

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“…The results comparing the fit accuracy between the cast and the maxillary complete denture base were evaluated on the second upper premolar and the second upper molar regions crossing the midpalatal suture, showing relatively high deformation in the conventional method due to polymerization shrinkage and internal stress. The mean value of discrepancies, however, was the lowest in the RP method, followed by that in the milling method and the injection molding method [ 23 ].…”

Section: Resultsmentioning

confidence: 99%

3D printed complete removable dental prostheses: a narrative review

et al. 2020

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Background The purpose of this paper is to review the available literature on three-dimensionally printed complete dentures in terms of novel biomaterials, fabrication techniques and workflow, clinical performance and patient satisfaction. Methods The methodology included applying a search strategy, defining inclusion and exclusion criteria, selecting studies and forming tables to summarize the results. Searches of PubMed, Scopus, and Embase databases were performed independently by two reviewers to gather literature published between 2010 and 2020. Results A total of 126 titles were obtained from the electronic database, and the application of exclusion criteria resulted in the identification of 21 articles pertaining to printed technology for complete dentures. Current innovations and developments in digital dentistry have successfully led to the fabrication of removable dental prostheses using CAD/CAM technologies. Milled dentures have been studied more than 3D printed ones in the currently available literature. The limited number of clinical studies, mainly case reports, suggest current indications of 3D printing in denture fabrication process to be custom tray, record bases, trial, interim or immediate dentures but not definitive prostheses fabrication. Limitations include poor esthetics and retention, inability to balance occlusion and low printer resolution. Conclusions Initial studies on digital dentures have shown promising short-term clinical performance, positive patient-related results and reasonable cost-effectiveness. 3D printing has potential to modernize and streamline the denture fabrication techniques, materials and workflows. However, more research is required on the existing and developing materials and printers to allow for advancement and increase its application in removable prosthodontics.

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Section: Resultsmentioning

confidence: 99%

3D printed complete removable dental prostheses: a narrative review

et al. 2020

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“…The use of prepolymerized PMMA block in the subtractive technique prevents the polymerization deformation during processing 6,10–13 . However, for additive technique, unpolymerized resin is three‐dimensional (3D) printed and polymerized by an ultraviolet (UV) or visible light source 14 . A posttreatment stage of UV light irradiation is also required, thus polymerization deformation might occur 11,15 …”

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confidence: 99%

“…In many cases, patients complain about the difficulty in managing mandibular CDs due to lack of retention rather than maxillary CDs 2,24 . However, previous studies generally focused on the maxillary denture base 5,14,19 . The studies evaluating the mandibular denture base adaptation and the efficacy of different fabrication methods remain scarce.…”

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confidence: 99%

Evaluation of Denture Base Adaptation Fabricated Using Conventional, Subtractive, and Additive Technologies: A Volumetric Micro‐Computed Tomography Analysis

Oğuz

Kılıçarslan

Özcan

et al. 2021

Journal of Prosthodontics

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Purpose An in vitro study to compare the adaptation of denture bases fabricated with 4 different techniques using volumetric 3‐dimentional (3D) analysis. Material and Methods Edentulous maxillary and mandibular casts were scanned, and standardized denture bases were designed using CAD design software. The same standard tessellation language (STL) data were used to produce the denture bases with 4 different fabrication methods: compression molding (CM), injection molding (IM), PMMA milling (PM), and 3D printing (3D) (n = 11/group). Milled wax denture bases were used to fabricate CM and IM groups. Denture bases placed on edentulous casts were scanned using micro‐computed tomography (micro‐CT). Volumetric gap between denture base and cast was calculated from 6 locations for maxilla (anterior ridge crest, posterior ridge crest, labial vestibule, buccal vestibule, palate, and posterior palatal seal) and 3 locations for mandible (intermolar, molar, and retromolar) in addition to overall gap measurements for edentulous arches. The data were analyzed with factorial analysis of variance (ANOVA), 1‐way ANOVA, and post‐hoc Duncan tests. Reproducibility of fabrication methods with regard to each location was assessed using Z test (α = 0.05). Results In the maxilla, the highest and lowest palatal gap measurements were recorded for CM (898.44 ± 87.73 mm3) and PM (357.16 ± 57.68 mm3) (p = 0.05). The highest gap measurements for CM and 3D were at palate and, for IM and PM were at posterior ridge crest. In mandible, the volumetric gap measurements for CM were the highest and for PM were the lowest irrespective of location (p = 0.05). PM group showed the best reproducibility and adaptation with the lowest overall mean gaps for both edentulous arches (p = 0.05). Conclusions Denture bases milled from PMMA blocks showed better adaptation than 3D printed, or wax milled and conventionally fabricated denture bases for both maxillary and mandibular arches. PMMA milling is a reproducible technique that enables the construction of accurate dentures. Clinicians should be cautious about the palatal gap when the compression molding technique is used. Micro‐CT is a valid technique for evaluating the denture base adaptation.

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“…Many factors determine the precision of the printed object, like light intensity, orientation, and`` angle of printing, number of layers, the used software, layer shrinkage, amount of supporting structure, and post-processing steps. 20 At the time of polymerization, the heat-curing resin tends to tilt the artificial teeth. Once the resin is removed from the flask, releasing of residual stresses that occur at the time of packing took place, which contributes to resin shrinkage.…”

Section: Discussionmentioning

confidence: 99%

Comparative laboratory evaluation of dimensional accuracy for 3D-printed complete maxillary denture

ElHameed

mohamed

2021

Egyptian Dental Journal

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Purpose: The objective of the research was to investigate dimensional accuracy concerning denture teeth deviation and vertical dimensional changes for three-dimensional printed, monolithic dentures relative to heat-cured, acrylic resin dentures. Materials and methods: A waxed-up reference maxillary denture was constructed on an educational master cast, and then duplicated to produce ten simulated waxed-up dentures. The planned virtual denture was designed by subtracting the scanned cast from the scanned waxed-up denture with the cast. This virtual denture was considered as a reference and saved alone in 3D-Standard Tessellation Language (STL) format. From this reference (CAD maxillary denture) ten DLP dentures were fabricated. Each fabricated heat-cured, and 3D-printed denture was scanned separately, and the scanned data was saved in an STL file. Each STL file of scanned maxillary dentures was superimposed on a reference virtual maxillary denture to evaluate the degree of denture teeth deviation. An electronic digital caliper was used to measure the occlusal vertical dimension (OVD) of the waxed-up denture and after denture fabrication for both groups to evaluate the change in OVD. Results: A paired t-test was used to compare the recorded data between both groups. It was reported that the higher mean values for either denture teeth deviation or vertical dimensional changes after dentures fabrication were noticed in heat-cured acrylic resin dentures. These values were highly statistically significant between the tested groups for both items of investigations at p ≤ 0.01. Conclusion: Under the restrictions of this research, tooth movements occur to some degree in both surveyed groups. However, three-dimensional monolithic printing dentures displayed greater dimensional precision with respect to denture teeth deviation and vertical dimensional alteration compared to heat-curing acrylic resin.

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Comparing accuracy of denture bases fabricated by injection molding, CAD/CAM milling, and rapid prototyping method

Cited by 83 publications

References 32 publications

3D printed complete removable dental prostheses: a narrative review

3D printed complete removable dental prostheses: a narrative review

Evaluation of Denture Base Adaptation Fabricated Using Conventional, Subtractive, and Additive Technologies: A Volumetric Micro‐Computed Tomography Analysis

Comparative laboratory evaluation of dimensional accuracy for 3D-printed complete maxillary denture

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