Journal List > J Korean Acad Prosthodont > v.53(3) > 1034827

Yang, Kim, Kim, and Seo: Removable implant-supported partial denture using milled bar with Locator® attachments in a cleft lip & palate patient: A clinical report

Abstract

Due to the limitations of conventional removable partial denture prostheses to treat a cleft lip & palate patient who shows scar tissue on upper lip, excessive absorption of the maxillary residual alveolar ridge, and class III malocclusion with narrow palate and undergrowth of the maxilla, 4 implants were placed on the maxillary edentulous region and a maxillary removable implant-supported partial denture was planned using a CAD/CAM milled titanium bar. Unlike metal or gold casting technique which has shrinkage after the molding, CAD/CAM milled titanium bar is highly-precise, economical and lightweight. In practice, however, it is very hard to obtain accurate friction-fit from the milled bar and reduction in retention can occur due to repetitive insertion and removal of the denture. Various auxiliary retention systems (e.g. ERA®, CEKA®, magnetics, Locator® attachment), in order to deal with these problems, can be used to obtain additional retention, cost-effectiveness and ease of replacement. Out of diverse auxiliary attachments, Locator® has characteristics that are dual retentive, minimal in vertical height and convenient of attachment replacement. Drill and tapping method is simple and the replacement of the metal female part of Locator® attachment is convenient. In this case, the Locator® attachment is connected to the milled titanium bar fabricated by CAD/CAM, using the drill and tapping technique. Afterward, screw holes were formed and 3 Locator® attachments were secured with 20 Ncm holding force for additional retention. Following this procedure, satisfactory results were obtained in terms of aesthetic facial form, masticatory function and denture retention, and I hereby report this case.

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Fig. 1.
Panoramic radiographic view shows residual dentition and alveolar bone loss due to advance periodontal disease.
jkap-53-207f1.tif
Fig. 2.
(A) Intraoral photographs after extraction, (B) Diagnostic waxup.
jkap-53-207f2.tif
Fig. 3.
Panoramic radiograph image after Implant installation.
jkap-53-207f3.tif
Fig. 4.
Photograph after taking Mx.& Mn. final impression.
jkap-53-207f4.tif
Fig. 5.
(A) Space evaluation for milled bar, (B) Try-in of bar pattern resin, (C) Bar design after scanned pattern resin, (D) Titanium milled bar and Locator® attachment,(E) Female part of Locator® attachment tightening by 20 Ncm torque.
jkap-53-207f5.tif
Fig. 6.
(A) Titanium milled bar try-in, (B) Passive fit evaluation: direct vision and tactile sensation, (C) Passive fit evaluation: periapical radiographic image, (D) Fabricated metal framework.
jkap-53-207f6.tif
Fig. 7.
Definitive prosthesis. (A) Frontal view after delivering definitive restoration, (B) Occlusal view after delivering definitive restoration, (C) View of fitting surface,(D) Definitive prosthesis after gold inlay cementation.
jkap-53-207f7.tif
Fig. 8.
6 months follow up: occlusal view.
jkap-53-207f8.tif
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