Effect of Anchorage on the Accuracy of Fit in Removable Partial Denture Framework

Gowri, Veena; Patil, Narendra; Nadiger, Ramesh K; Guttal, Satyabodh S

doi:10.1111/j.1532-849x.2010.00594.x

Cited by 22 publications

(19 citation statements)

References 20 publications

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“…The results in the anterior strap were considered of acceptable clinical value for both techniques (<0.31 mm). Gowri et al found a misfit of 0.16 mm at the anterior border of the palatal strap major connector, similar to the direct technique results from this study. The indirect technique results of this study were in opposition to other studies, which showed the greatest misfit occurred at the anterior strap area of the indirect RP techniques.…”

Section: Discussionsupporting

confidence: 89%

“…The results in the anterior strap were considered of acceptable clinical value for both techniques (<0.31 mm). Gowri et al 15 found a misfit of 0.16 mm at the anterior border of the palatal strap major connector, similar to the direct technique results from this study.…”

Section: Discussionsupporting

confidence: 89%

“…14 The silicone replica technique has been used in many studies. [15][16][17] Recently, digital methods were developed to evaluate the fit of a removable prosthesis to the cast by scanning the prosthesis and the cast after saving the scan into a standard tessellation language (STL) file format and superimposing the two STL files of each scan using surface matching software. Then, the distance between framework and the cast is measured.…”

mentioning

confidence: 99%

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Virtual Evaluation of the Accuracy of Fit and Trueness in Maxillary Poly(etheretherketone) Removable Partial Denture Frameworks Fabricated by Direct and Indirect CAD/CAM Techniques

Negm

Aboutaleb

Alam-Eldein

2019

Journal of Prosthodontics

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Purpose To compare the accuracy of fit and trueness of maxillary poly(etheretherketone) (PEEK) removable partial denture (RPD) frameworks fabricated by direct and indirect computer‐aided design/computer‐aided manufacturing (CAD/CAM) techniques. Materials and Methods A definitive maxillary class I master epoxy model was duplicated to create a stone cast. The cast was scanned, and an RPD was designed. Standard tessellation language (STL) data were used to fabricate 20 identical RPD frameworks using two CAD/CAM techniques: direct milling of PEEK and indirect additive manufacturing (resin printing combined with PEEK thermopressing using the lost‐wax technique). All the frameworks for each technique (n = 10) and the reference cast were scanned. To assess the accuracy of fit, a color map was constructed using metrology software, and the misfit (distance between each framework and the reference cast) was measured at 25 standardized points. To assess the overall trueness, each framework STL file was superimposed over the original design's STL file, and the average deviation was recorded in microns. Data were statistically analyzed using t‐test. Results Color mapping showed distinct pressure areas in the anterior and posterior straps of the major connector in the indirect technique, while a more uniform distribution of the color map was observed in the direct technique. A significant difference was found between the two techniques regarding the overall accuracy of fit. Compared with the indirect technique, the milled frameworks showed significantly better overall trueness (p < 0.001). Conclusions Although a significant difference in the overall fit accuracy was noted between both techniques, the fit was an acceptable clinical fit. The fabrication method affects the fit in the anterior and posterior strap areas. The frameworks of the direct technique revealed better overall trueness values compared with the indirect technique.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionsupporting

confidence: 89%

mentioning

confidence: 99%

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Virtual Evaluation of the Accuracy of Fit and Trueness in Maxillary Poly(etheretherketone) Removable Partial Denture Frameworks Fabricated by Direct and Indirect CAD/CAM Techniques

Negm

Aboutaleb

Alam-Eldein

2019

Journal of Prosthodontics

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“…To date, due to the complexity of regular RPD structures, and a wide range of designs, few studies have evaluated the fit and accuracy of RPDs quantitatively; specifically, by digital superimposition of the STL format of the scanned models. To evaluate the fit and accuracy of RPD frameworks, visual inspection, pressing test, and indirect measurements of the gap filled with an impression material have been reported in the literature . However, a limitation regarding past methods is that these measurements were made in specific locations, and thus, do not reflect the actual overall fit of the RPD framework.…”

Section: Discussionmentioning

confidence: 99%

“…Various methods of analyzing the accuracy and fit of an RPD framework have been reported . Some of these methods include the application of different disclosing materials, sectioning the RPD and direct measurements of the gaps between the prosthesis and the master casts, and digital superimposition of models .…”

mentioning

confidence: 99%

An In Vitro Investigation of Accuracy and Fit of Conventional and CAD/CAM Removable Partial Denture Frameworks

Soltanzadeh

Suprono

Kattadiyil

et al. 2018

Journal of Prosthodontics

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Purpose: To evaluate the overall accuracy and fit of conventional versus computeraided design/computer-aided manufactured (CAD/CAM) removable partial denture (RPD) frameworks based on standard tessellation language (STL) data analysis, and to evaluate the accuracy and fit of each component of the RPD framework. Materials and Methods: A maxillary metal framework was designed for a Kennedy class III Modification I arch. The master model was scanned and used to compare the fit and accuracy of RPD frameworks. Forty impressions (conventional and digital) of the master cast were made and divided into 4 groups based on fabrication method: group I, lost-wax technique (conventional technique), group II, CAD-printing, group III, CAD-printing from stone cast, and group IV, lost-wax technique from resin-printed model. RPD frameworks were fabricated in cobalt-chromium alloy. All frameworks were scanned, and the gap distance between the framework and scanned master model was measured at 8 locations. Color mapping was conducted using comprehensive metrology software. Data were statistically analyzed using the Kruskall-Wallis test, followed by the Bonferroni method for pairwise comparisons (α = 0.05). Results: Color mapping revealed distinct discrepancies in major connectors among the groups. When compared to 3D-printed frameworks, conventional cast frameworks fabricated using dental stone or printed resin models revealed significantly better fit (p < 0.05) particularly in the major connectors and guide plates. The biggest gap (0.33 mm ± 0.20 mm) was observed with the anterior strap of the major connector with the printed frameworks (groups II and III). The method of fabrication did not affect the adaptation of the rests or reciprocation plates. Conclusions: Although both conventional and 3D-printing methods of framework fabrication revealed clinically acceptable adaptation, the conventional cast RPD groups revealed better overall fit and accuracy.

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

Yoon

Liu

et al. 2022

Computers in Biology and Medicine

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Effect of Anchorage on the Accuracy of Fit in Removable Partial Denture Framework

Cited by 22 publications

References 20 publications

Virtual Evaluation of the Accuracy of Fit and Trueness in Maxillary Poly(etheretherketone) Removable Partial Denture Frameworks Fabricated by Direct and Indirect CAD/CAM Techniques

Virtual Evaluation of the Accuracy of Fit and Trueness in Maxillary Poly(etheretherketone) Removable Partial Denture Frameworks Fabricated by Direct and Indirect CAD/CAM Techniques

An In Vitro Investigation of Accuracy and Fit of Conventional and CAD/CAM Removable Partial Denture Frameworks

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

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