Digital Workflow for Retrofitting a Surveyed Crown Using a Removable Partial Denture as an Antagonist

Bae, Min‐Soo; Oh, Won-Suk; Park, Yeon‐Hee; Lee, Jung‐Jin

doi:10.1111/jopr.13187

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…3 Recently, a procedure using computer-aided design and computer-aided manufacturing (CAD/CAM) has been introduced to obtain a crown with appropriate fit and contour in some clinical cases. [3][4][5][6][7][8][9][10][11] Using CAD/CAM for this task reduces the number of steps for the process and, therefore, the potential for error. 8 This procedure typically does not require the existing RPD to be sent to the dental laboratory, so patients have no trouble with daily life.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Zirconia Abutment Crown and Clasp Under Existing Removable Partial Denture Using CAD/CAM Technology

Tasaka¹,

Shimizu²,

Hirabayashi³

et al. 2021

CCIDE

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This clinical report describes a technique for fabricating a retrofit zirconia crown and clasp for an existing removable partial denture (RPD) using computer-aided design and computer-aided manufacturing (CAD/CAM). A 58-year-old patient developed acute pulpitis of a tooth, and the RPD clasp was broken on the tooth. A pre-preparation scan was captured using an intraoral scanner. The existing RPD was placed in the mouth, and scans of the postpreparation, antagonist arch, and interocclusal record were made. A zirconia crown was designed by superimposing the pre-preparation scan and the post-preparation scan of the abutment tooth. The design data were transferred to a 5-axis milling machine, and the crown was milled from zirconia. The crown was luted using resin cement. An intraoral scan of the crown with RPD was taken, and the RPD was removed to re-scan the proximal guide plane of the crown. The I-bar clasp was designed, and the casting pattern was built using a 3D printer. The pattern was used to cast the clasp. The clasp was set using autopolymerizing acrylic resin to the RPD. The main advantages of this efficient process are that patients can use their RPDs during fabrication of the crown of the abutment tooth. The limitations of using this technique include the cost of the intraoral scanner and the education for the dental clinicians and technicians. In this clinical report, CAD/CAM technology prevented human error, required no adjustment, and uninterrupted use of the RPD for fabricating a retrofit zirconia crown and clasp for an existing RPD.

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Section: Introductionmentioning

confidence: 99%

Fabrication of Zirconia Abutment Crown and Clasp Under Existing Removable Partial Denture Using CAD/CAM Technology

Tasaka¹,

Shimizu²,

Hirabayashi³

et al. 2021

CCIDE

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“…19,20 Nowadays, contemporary CAD-CAM software allows the creation of a "biogeneric copy" of the wax up producing an exact replica of the designed contours, guide planes, rest seats, and occlusal relationships 21 and currently most contemporary CAD-CAM systems also have virtual articulators that allow clinicians to analyze static and dynamic occlusion of this type of restoration. [22][23][24][25] The ideal design of the rest seat for surveyed crowns plays an important role in the treatment with removable prosthesis because it directs the forces along the long axis of the abutment tooth, maintains the planned clasp-tooth relationship, prevents extrusion of the abutment teeth and prevents the denture base from moving cervically and impinging the gingival tissue. 26 Clinicians have a variety of types of rest seat designs to choose from for survey crowns depending on the design of the removable partial denture.…”

mentioning

confidence: 99%

“…Initially, CAD‐CAM surveyed crowns were fabricated based on duplicating the waxed tooth designed to fit a current removable dental prosthesis 19,20 . Nowadays, contemporary CAD‐CAM software allows the creation of a “biogeneric copy” of the wax up producing an exact replica of the designed contours, guide planes, rest seats, and occlusal relationships 21 and currently most contemporary CAD‐CAM systems also have virtual articulators that allow clinicians to analyze static and dynamic occlusion of this type of restoration 22–25 …”

mentioning

confidence: 99%

Fracture resistance of zirconia surveyed crowns with four different occlusal rest seat designs

Jurado

Ahmed

Lawson

et al. 2023

Journal of Prosthodontics

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PurposeTo determine the fracture resistance of chairside computer‐aided design and computer‐aided manufacturing (CAD‐CAM) zirconia surveyed crowns for a mandibular first molar without occlusal rest and with four different rest seat designs.Materials and MethodsSeventy CAD‐CAM zirconia 4Y‐PSZ (IPS e.max ZirCAD MT for CEREC A1, C15, Ivoclar Vivadent) crowns (14 specimens/group) were designed and fabricated with a dental chairside CAD‐CAM system (CEREC PrimeScan, and CEREC MCXL Dentsply Sirona). The restorations were divided into groups according to the following rest seat designs: (1) Surveyed crown without rest seat, (2) surveyed crowns with disto‐occlusal rest seat, (3) surveyed crowns with disto‐occlusal extended rest seat, (4) surveyed crowns with interproximal rest seat, and (5) continuous rest seat. Crowns were treated with a primer system (Monobond Plus, Ivoclar Vivadent) and cemented using resin luting cement (Multilink Automix, Ivoclar Vivadent) to resin‐printed dies (Grey Resin V4, FormLabs). Subsequently, the crowns were subjected to 200,000 load cycles at 1 Hz with 20 N force and then loaded with a steel indenter until fracture. The test results were analyzed with one‐way Analysis of Variance (ANOVA) and HSD Tukey post‐Hoc test.ResultsThe mean fracture resistance of surveyed crowns without and with different rest seats was significantly different from each other. Surveyed crowns with no rest seat displayed the highest resistance (4238 N) followed by crowns with continuous rest seat (3601 N), crowns with disto‐occlusal extended rest seat (3283 N), and crowns with disto‐occlusal rest seat (3257 N). Crowns with interproximal rest seat displayed the lowest fracture resistance (2723 N).ConclusionsSurveyed crowns without rest seats had a higher fracture resistance than crowns with rest seats Surveyed crowns with interproximal rest seats presented the lowest fracture resistance among all rest seat designs. Crowns with disto‐occlusal rest seats, disto‐occlusal extended rest seats, and continuous rest seats displayed similar fracture resistance.

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An indirect-direct technique with hot water for fabricating a cast metal crown under an existing removable partial denture

Haraguchi

Towithelertkul

Ali

et al. 2024

The Journal of Prosthetic Dentistry

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Digital Workflow for Retrofitting a Surveyed Crown Using a Removable Partial Denture as an Antagonist

Cited by 7 publications

References 16 publications

Fabrication of Zirconia Abutment Crown and Clasp Under Existing Removable Partial Denture Using CAD/CAM Technology

Fabrication of Zirconia Abutment Crown and Clasp Under Existing Removable Partial Denture Using CAD/CAM Technology

Fracture resistance of zirconia surveyed crowns with four different occlusal rest seat designs

An indirect-direct technique with hot water for fabricating a cast metal crown under an existing removable partial denture

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