Comparison between digital superimposition and microcomputed tomography methods of fit assessment of removable partial denture frameworks

Conceição, Pedro; Portugal, Jaime; Franco, Margarida; Alves, Nuno; Marques, Duarte; Neves, Conceição

doi:10.1016/j.prosdent.2023.02.002

Cited by 3 publications

(6 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the development of digital technologies, it is possible to use reverse CAE techniques which allow quantitative analysis not only by means of specific digital measurements but also by digital superimposition of the entire RPD framework, enabling better quality of production control [53]. However, the application of these techniques on a clinical daily basis is limited mainly by inaccurate soft tissue measurement with current intra-oral scanner technology and the patient exposure to X-ray radiation when a computerized tomography scan is used [31,55,[90][91][92].…”

Section: Discussionmentioning

confidence: 99%

“…To overcome the limitations of conventional RPD production, researchers began to apply not only computer-aided design (CAD) with RPD software but also computer-aided manufacturing (CAM) techniques and materials for the RPD metal framework production [4,29,30]. It is increasingly popular to adapt digital procedures for RPD metal framework production, combining digital and conventional techniques [31,32]. Nevertheless, digital techniques' contribution to RPD metal framework production needs to be clarified in the recent scientific literature.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of Removable Partial Denture Metal Frameworks Produced by Digital Methods—A Systematic Review

Conceição,

Portugal,

Neves

2023

Applied Sciences

Self Cite

View full text Add to dashboard Cite

(1) Introduction: This review aimed to synthesize the significant literature addressing digital techniques for producing removable partial denture (RPD) metal frameworks, focusing on oral fit outcomes. (2) Material and Methods: A systematic review of the Web of Science and Pubmed databases was performed according to PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-analyses) guidelines. The selection was for original articles in English containing relevant data on RPD metal frameworks produced with digital techniques, including study characteristics, digital techniques, and fit assessment methods and outcomes. (3) Results: From the 967 search studies, 405 were duplications, and 521 were excluded after screening against set criteria. A manual search included 21 studies resulting in 62 papers for review. Extra-oral was more frequently used than intra-oral scanning. The computer-assisted design was the most applied digital technique. Additive manufacturing was preferred to milling for direct and indirect fabrication of frameworks. Fit assessments were based on qualitative measures, but quantitative evaluation showed acceptable clinical fit for RPDs made by digital protocols. (4) Conclusions: The combination of direct metal additive manufacturing with conventional impression was the most used protocol and included better qualitative and quantitative fit outcomes than the other digital protocols.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of Removable Partial Denture Metal Frameworks Produced by Digital Methods—A Systematic Review

Conceição,

Portugal,

Neves

2023

Applied Sciences

Self Cite

View full text Add to dashboard Cite

show abstract

“…From a clinical perspective, the gap between the inner surface of the framework and the supporting structures represents the fit accuracy of an RPD [29]. Various methods for assessing this gap have been described in the literature [7,39], but a gold-standard method is still unreported. The fitting of an RPD framework can be analyzed either qualitatively or quantitatively [31].…”

Section: Discussionmentioning

confidence: 99%

“…In quantitative assessment methods, a direct measure of the gap using analog instruments has proven difficult, as it involves sectioning the RPD, which may not reflect the overall fitting [7]. Therefore, an indirect quantitative assessment of the gap has often been applied through a silicone mold of this discrepancy, followed by the measurement of its weight or thickness [3,31,39,40]. However, the deformation and rupture of the elastomeric material during its manipulation, coupled with the difficulty of measuring its thickness due to its elasticity, are important disadvantages of this approach [15,29,40].…”

Section: Discussionmentioning

confidence: 99%

Fit Accuracy of Cobalt–Chromium and Polyether Ether Ketone Prosthetic Frameworks Produced Using Digital Techniques: In Vitro Pilot Study

Barbosa,

Figueiral,

Neves

et al. 2023

Applied Sciences

Self Cite

View full text Add to dashboard Cite

This pilot study aimed to compare the fit accuracy of cobalt–chromium (Co-Cr) and polyether ether ketone (PEEK) removable partial denture frameworks, produced by digital technologies. Two study models of previously prepared Kennedy’s Class I and Class III mandibular dental arches were scanned. For each model, two frameworks were digitally designed and manufactured using a Co-Cr alloy via the selective laser melting (SLM) technique, and using PEEK via the milling technique. A qualitative assessment of the framework’s fit accuracy to the corresponding study models was carried out using calibrated endodontic instruments and image amplification. Best-fit superimpositions between the reference design and the scanned frameworks were performed using the Geomagic Control X version 2018, 3D Systems software, allowing the expression of trueness by calculating the root mean square (RMS) value. Higher fit accuracy was observed for the milled frameworks, with the Class I PEEK framework showing the best fit accuracy to the corresponding model. RMS values were Class I—148.3 μm for Co-Cr and 69.2 μm for PEEK; Class III—107.2 μm for Co-Cr and 59.7 μm for PEEK. In the experimental conditions used, the milled PEEK frameworks showed better fit accuracy and higher trueness than the SLM-printed Co-Cr ones in both Kennedy classes.

show abstract

“…The quality of the production largely depends on the experience of the laboratory technician and the quality of the impressions taken by the clinician, which is a time-consuming and expensive method [9,24]. Normally, this technique is prone to several errors that can result in 75% of frameworks not fitting properly on the supporting structures at the time of insertion into the patient's oral cavity [12,25,26]. Thus, over the years, the need to develop new techniques has increased, and scientific advances have made it possible to improve the process of RPD framework production, reducing the time and cost of fabrication, and improving the fit and functional efficiency of rehabilitations [1,3].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Retentive Forces from Removable Partial Denture Clasps Manufactured by the Digital Method

et al. 2023

Self Cite

View full text Add to dashboard Cite

The purpose of this study was to evaluate the retentive forces over time of removable partial denture clasps fabricated by the digital method. Occlusal rest seats were fabricated on three premolar teeth fixed in acrylic blocks (9 × 20 × 40 mm). Digitization of the teeth was performed using a laboratory scanner (Zirkonzahn Scanner S600 GmbH, Gais, Italy). After the analysis and determination of the insertion axis, two types of clasps with mesial occlusal rests were designed per tooth: the back-action and the reverse back-action clasps, using the Partial Planner Zirkonzahn program. The file was sent for fabrication of six metal clasps from a cobalt-chromium SP2 alloy in the EOSINT M270 system by a direct laser sintering process. The Instron 5544 universal testing machine was used to perform 20,000 cycles of clasp insertion and removal in the corresponding tooth with a load cell of 100 N and a speed of 2.5 mm/s. The retentive force was recorded for each of the 1000 cycles, and the change in retention over time was calculated. Statistical analysis was performed using the nonparametric Mann–Whitney test and a significance level of 5%. At 16,000 cycles, a maximum change in retention of 3.74 N was recorded for the back-action clasps and a minimum of −24.28 N at 1000 cycles for the reverse back-action clasps. The reverse back-action clasps exhibited statistically significant lower change in retention than the reverse-action clasps at 4000 and 5000 cycles. No differences were observed in the remaining cycles. During the 20,000 cycles, the change in retention was low regardless of the type of clasp. For most cycles, there were no differences in the change in retention between the two types of clasps.

show abstract

Comparison between digital superimposition and microcomputed tomography methods of fit assessment of removable partial denture frameworks

Cited by 3 publications

References 45 publications

Evaluation of Removable Partial Denture Metal Frameworks Produced by Digital Methods—A Systematic Review

Evaluation of Removable Partial Denture Metal Frameworks Produced by Digital Methods—A Systematic Review

Fit Accuracy of Cobalt–Chromium and Polyether Ether Ketone Prosthetic Frameworks Produced Using Digital Techniques: In Vitro Pilot Study

Evaluation of the Retentive Forces from Removable Partial Denture Clasps Manufactured by the Digital Method

Contact Info

Product

Resources

About