Pattern waxes and inaccuracies in fixed and removable partial denture castings

Diwan, Randa; Talic, Yousef F.; Omar, Noura; Sadig, Walid

doi:10.1016/s0022-3913(97)70152-5

Cited by 17 publications

(15 citation statements)

References 10 publications

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“…The inlay waxes contract by as much as 0.35% when cooled from 37°C to 25°C 11,12 . A direct relationship was also found between the flow of wax and the casting shrinkage 13,14 . The fit may also alter during the finishing of the framework to adapt it to the master cast.…”

mentioning

confidence: 86%

“…The inlay waxes contract by as much as 0.35% when cooled from 37 • C to 25 • C. 11,12 A direct relationship was also found between the flow of wax and the casting shrinkage. 13,14 The fit may also alter during the finishing of the framework to adapt it to the master cast. Care must be taken not to build up heat in the framework during polishing, which would cause the framework to warp.…”

mentioning

confidence: 99%

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

Gowri

Patil

Nadiger

et al. 2010

Journal of Prosthodontics

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confidence: 86%

mentioning

confidence: 99%

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

Gowri

Patil

Nadiger

et al. 2010

Journal of Prosthodontics

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“…They also observed that the fit of frameworks deteriorated markedly as the storage time increased from 24 h to 1 week. [ 1 ]…”

Section: Discussionmentioning

confidence: 99%

“…This additional storage time could increase the distortion of the wax and the refractory cast and may lead to inaccuracies in castings. [ 1 ]…”

Section: Introductionmentioning

confidence: 99%

Effect of storage time and framework design on the accuracy of maxillary cobalt-chromium cast removable partial dentures

Viswambaran

Sundaram

2015

Contemp Clin Dent

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Statement of Problem:Inaccuracies in the fit of palatal major connectors may be related to distortion of the wax pattern due to prolonged storage time and faulty major connector design.Purpose:This in vitro study was carried out to find out the effect of storage time and major connector design on the accuracy of cobalt-chromium cast removable partial dentures (RPDs).Materials and Methods:A brass metal die with a Kennedy Class III, modification 1, the partially edentulous arch was used as a master die. Thirty-six refractory casts were fabricated from the master die. The refractory casts were divided into three groups (Group I: Anterior-posterior palatal bar, Group II: Palatal strap and Group III: Palatal plate) based on the design of maxillary major connector and subdivided into four groups (sub Group A: 01 h, sub Group B: 03 h, Sub Group C: 06 h, and sub Group D: 24 h) based on the storage time. For each group, 12 frameworks were fabricated. The influence of wax pattern storage time and the accuracy of the fit palatal major connector designs on the master die were compared. Casting defects (nodules/incompleteness) of the frameworks were also evaluated before finishing and polishing. Repeated measures analysis of variance was used to analyze the data.Results:The gap discrepancy was least in sub Group A (01 h) followed by sub Group B (03 h) and C (06 h) and most in sub Group D (24 h). Statistically significant differences (P < 0.05 in all locations L1–L5) in the fit of the framework were related to the design of the major connector. The gap discrepancy was least in Group I (anterior-posterior palatal bar) followed by Group II (palatal strap) and most in Group II (palatal plate).Conclusions:It is recommended that the wax patterns for RPD to be invested immediately on completion of the wax procedure. The selection of a major connector design is crucial for an accurate fit of RPD.

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“…Although injecting thermoplastic resins into molds is considered a conventional method of fabrication, it is not a common technology in dental laboratories because the need of expensive equipment and this could be a disadvantage. 5,6 On the other hand, the construction of computer aided dental prostheses has become common practice in dentistry and considered fundamentally important for patients seeking more rapid, accurate, and functionally efficient prosthetic rehabilitation.…”

Section: Introductionmentioning

confidence: 99%

Comparative Evaluation Of Physical Properties Of Conventionally Constructed Versus CAD/CAM Milled Frameworks For Kennedy Class I Partial Dentures

Mohamed

Hassan

2019

Egyptian Dental Journal

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Aim: The objective of this study was to compare the physical properties (retention, surface roughness, and wear) of conventionally constructed (pressed) bioHPP removable partial denture (RPD) frameworks versus computer aided designed-computer manufactured (CAD/CAM) RPD frameworks. Materials and Methods: Over standardized epoxy resin cast models, twenty frameworks were fabricated and divided equally into two groups, group A received ten conventionally fabricated (pressed) bioHPP frameworks and group B received ten CAD/CAM milled frameworks. Each framework was subjected to insertion/ removal cycles by using universal testing machine, (360, 720, 1080, 1440, 2116 cycles) representing time intervals baseline, three, six, nine-and twelvemonths respectively, where retention, wear and surface roughness were measured before and after each time interval. Results: Group B(CAD/CAM) milled RPD frameworks results showed statistically significant difference with higher mean values than group A (pressed) RPD frameworks results in all measured parameters throughout all time intervals. Conclusion: Within the limitations of this study, it could be concluded that either with milled or pressed way of construction BioHPP remains a reliable material that could be used to construct a highly accurate RPD framework with acceptable physical properties.

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Pattern waxes and inaccuracies in fixed and removable partial denture castings

Cited by 17 publications

References 10 publications

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

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

Effect of storage time and framework design on the accuracy of maxillary cobalt-chromium cast removable partial dentures

Comparative Evaluation Of Physical Properties Of Conventionally Constructed Versus CAD/CAM Milled Frameworks For Kennedy Class I Partial Dentures

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