The accuracy of a novel 3D digital evaluation method of intraoral fitness for removable partial dentures

Yoon, Jungmin; Liu, Yunsong; Liu, Yushu; Sun, Yuchun; Ye, Hongqiang; Zhou, Yongsheng

doi:10.1016/j.compbiomed.2022.105348

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…The the silicone replica of the gap may be sectioned afterwards and its thickness directly revealing the gap was measured with stereomicroscope, digital microscope, electronic calipers or profile projector [ 18 , 35 , 45 , 46 ]. However, Yoon et al reported that the number of measuring points have effect on the average thickness of the silicon replicas, and that the accuracy of silicone film method was not sufficiently reliable [ 47 ]. In contrast, three-dimensional surface-matching can be used to assess the fit accuracy of RPDs more comprehensively and effectively than silicone film method [ 47 ].…”

Section: Discussionmentioning

confidence: 99%

“…However, Yoon et al reported that the number of measuring points have effect on the average thickness of the silicon replicas, and that the accuracy of silicone film method was not sufficiently reliable [ 47 ]. In contrast, three-dimensional surface-matching can be used to assess the fit accuracy of RPDs more comprehensively and effectively than silicone film method [ 47 ]. Consequently, for silicone film method, the adequate force applied during the setting time, the type of silicone replica, as well as the number and site of measuring points need to be clarified, which is necessary to insure the reliability and reproducibility of the outcomes of individual studies in the future.…”

Section: Discussionmentioning

confidence: 99%

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Fit accuracy in the rest region of RPDs fabricated by digital technologies and conventional lost-wax casting: a systematic review and meta-analysis

Qiu,

Liu,

et al. 2023

BMC Oral Health

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Background Digital technologies have recently been introduced into the fabrication of removable partial dentures (RPDs). However, it is still unclear whether the digitally fabricated RPDs fit better than conventionally cast ones in the rest region. The aim of this study was to evaluate the fit accuracy in the rest region of RPDs fabricated by digital technologies and compare it to those made by conventional lost-wax (CLW) technique. Methods A comprehensive search was conducted in Cochrane Library, PubMed, EMbase, Web of Science and SpringerLink. Studies published up to August 2022 were collected. Two authors analyzed the studies independently and assessed the risk of bias on the modified methodological index for non-randomized studies (MINORS) scale. The mean values of gap distance between rests and corresponding rest seats of each study were extracted as outcome. A random-effects model at a significance level of P < 0.05 was used in the global comparison and subgroup analysis was carried out. Results Overall, 11 articles out of 1214 complied with the inclusion criteria and were selected, including 2 randomized controlled trials (RCTs), 1 non-randomized clinical trial and 8 in vitro studies. Quantitative data from Meta-analysis revealed that fit accuracy in the rest region of RPDs fabricated with CLW showed no statistically significant difference with digital techniques (SMD = 0.33, 95%CI (-0.18, 0.83), P = 0.21). Subgroup analysis revealed a significantly better fit accuracy of CLW-fabricated RPDs in the rest region than either additive manufacturing (AM) groups or indirect groups (P = 0.03, P = 0.00), in which wax or resin patterns are milled or printed before conventional casting. While milled RPDs fit significantly better than cast ones in the rest region (P = 0.00). With digital relief and heat treatment, hybrid manufactured (HM) clasps obtained better fit accuracy in the rest region (P < 0.05). In addition, finishing and polishing procedure had no significant influence in the fit accuracy in all groups (P = 0.83). Conclusions RPDs fabricated by digital technologies exhibit comparable fit accuracy in rest region with those made by CLW. Digital technologies may be a promising alternative to CLW for the fabrication of RPDs and additional studies are recommended to provide stronger evidence. Trial registration CRD42020201313.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Fit accuracy in the rest region of RPDs fabricated by digital technologies and conventional lost-wax casting: a systematic review and meta-analysis

Qiu,

Liu,

et al. 2023

BMC Oral Health

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“…Accurate measurement and fast analysis were done. (12) The use of unpolymerized polymers for printing the castable patterns may be responsible for these outcomes. Polymerization shrinkage during the 3D printing process is theoretically possible since the patterns are not fully polymerized.…”

Section: Ii) 2d and 3d Comparison Between Conventionalmentioning

confidence: 99%

Effect of different fabrication technique on the accuracy of maxillary Kennedy class II cases

Eid,

Mohamed,

Maryood

et al. 2023

Egyptian Dental Journal

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Aim of this study:The aim of this study was to evaluate the accuracy of two different fabrication techniques (direct milling and indirect printing of castable resin then casted by lost wax technique) of Co-Cr frameworks using Geomagic software. Material and methods:This in vitro study was applied on a ready-made (Kennedy class II modification 1) maxillary stone model used for educational purposes. After alteration, the cast was scanned, and a digital removable partial denture framework was created. Twelve frameworks were constructed and divided into two groups were defined: Group A: Six frameworks were printed with castable resin, then casted by the lost wax technique into Co-Cr frameworks; Group B: Six frameworks were milled directly from co-cr blank. Using the Geomagic Control X programme, comparative 3D analysis was conducted to evaluate the precision of the manufactured frameworks.Student's t-test was used for comparing data. P value ≤ .05 was considered statistically significant. Results:The accuracy of the occlusal rests was much higher in group B (milled) than in group A (printed). The same results were found regarding the 3D comparison of the overall accuracy, in which group B was significantly more accurate than group A. Conclusion:Within the limitation of this study, it could be concluded that: Cobalt Chromium partial denture frameworks fabricated by direct milling technique are more accurate than frameworks fabricated by indirect 3D printing of resin framework then casted by lost wax technique.

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Clinical evaluation of a one‐piece polyetheretherketone removable partial denture fabricated using a novel digital workflow: A self‐controlled clinical trial

Yoon,

Liu,

Sun

et al. 2024

Journal of Prosthodontics

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PurposeTo explore the clinical application of one‐piece polyetheretherketone (PEEK) removable partial dentures (RPDs) fabricated using a novel digital workflow and to evaluate their weights and fits in vivo and patient satisfaction.Materials and MethodsFifteen cases with posterior partially edentulous situations were selected, and each patient received two types of RPDs, including a novel digital workflow (test group) and a conventional workflow (control group). For the test group, one‐piece RPDs were designed through three‐dimensional (3D) methods by scanning stone casts and fabricated by milling PEEK discs. Each RPD was weighed. The gaps between the oral tissue and RPDs in each group were duplicated using a polyvinylsiloxane (PVS) replica and measured by 3D analysis. A visual analog scale (VAS) was used to evaluate the patient's satisfaction. Paired t‐tests were used to compare the differences in the weight, the gaps of each RPD, and VAS values between the two groups. One‐way analysis of variance tests was used to compare the differences in the gap among different components in each group.ResultsThe RPD in the test group weighed less than that in the control group (p < 0.01). No statistically significant differences in the gaps of denture bases and rests (p > 0.05) were found between the two groups, but the gaps of major connectors in the test group were significantly smaller than in the control group (p < 0.05). The VAS scores for comfortableness and masticatory efficiency were not significantly different between the two groups (p > 0.05) but the scores for the aesthetic appearance of the clasps in the test group were significantly higher than that in the control group (p < 0.05).ConclusionsOne‐piece PEEK RPDs manufactured using a novel digital workflow weighed less than conventional RPDs and exhibited a clinically acceptable internal fit. Although the aesthetic appearance of the PEEK clasps was superior to the control, there is still room for improvement.

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The accuracy of a novel 3D digital evaluation method of intraoral fitness for removable partial dentures

Cited by 3 publications

References 26 publications

Fit accuracy in the rest region of RPDs fabricated by digital technologies and conventional lost-wax casting: a systematic review and meta-analysis

Fit accuracy in the rest region of RPDs fabricated by digital technologies and conventional lost-wax casting: a systematic review and meta-analysis

Effect of different fabrication technique on the accuracy of maxillary Kennedy class II cases

Clinical evaluation of a one‐piece polyetheretherketone removable partial denture fabricated using a novel digital workflow: A self‐controlled clinical trial

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