J Dent Rehabil Appl Sci.  2015 Dec;31(4):378-386. 10.14368/jdras.2015.31.4.378.

Mandibular implant-natural tooth retained overdenture using magnetic attachment with stress breaker

• Park EC
• Lee SY
• Kim HJ

• KMID: 2150203
• DOI: http://doi.org/10.14368/jdras.2015.31.4.378

Abstract

Overdenture has the advantage of improving the stability and retention of the denture but the abutment may be easily affected by caries or periodontal disease and the thin denture can be easily broken. The magnetic attachment overdenture has a high vertical retention but a low horizontal retention, thus, exerting a less disruptive force to the abutment or implant and shows less abrasion or damage compared to other mechanical retainers. Denture fractures in overdenture is caused by the thin denture base as the attachment is inserted, but it may also be caused by the difference in detrusion between soft tissue and hard tissue, and between an implant and a natural tooth. To compensate this shortcoming, a magnetic attachment with a silicone ball inserted in the magnet was developed as we report a successful case using this specific type of magnetic attachment overdenture.

Keyword

overdenture; magnet; stressbreaker

MeSH Terms

Denture Bases
Denture, Overlay*
Dentures
Periodontal Diseases
Silicon
Silicones
Tooth*
Silicon
Silicones

Figure

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  Fig. 1 Panoramic radiographic view of first visiting.

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  Fig. 2 Drug induced gingival hyperplasia. (A) Right side, (B) Frontal side, (C) Left side.

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  Fig. 3 Intraoral condition. (A) After extraction, gingivectomy and 1st periodontal treatment, (B) 2nd periodontal treatment.

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  Fig. 4 First stage of implant surgery. (A) Intraoral photo before the surgery, (B) Installated implant fixture, (C) Sutured state.

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  Fig. 5 Second stage of implant surgery. (A) Intraoral photo before the surgery, (B) Exposed implant fixture, (C) Connected a healing abutment and sutured state.

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  Fig. 6 Space measurement for attachment and denture base. (A) Intraoral photo, (B) Fabricated wax denture, (C) Duplicate model with wax denture and use thermoplastic resin for taking outer form of wax denture, (D, E) Measure the available space for attachment and denture base thickness.

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  Fig. 7 (A) Magsoft®(Left; stress breaking type), (B) Magfit-IP-BS®(Right; conventional magnetic attachment).

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  Fig. 8 (A) Working cast for fabricating keeper, (B), (C) Surveying for parallization between #33 and #43.

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  Fig. 9 (A), (B) Casted attachment.

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  Fig. 10 Fabricating conventional complete denture. (A) Cementing a casted attachment and connecting another attachement on the implant, (B) Functional impression taking, (C) Master cast, (D) Casted framework, (E) Record base and wax rim, (F) Vertical dimension taking, (G) Wax denture, (H) Bite registration taking for clinical remounting.

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  Fig. 11 Attached dummy on the master cast.

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  Fig. 12 Cementing the magnet with complete denture in oral area. (A) Make the hole for flowing excessive resin and checking correct location of the magnet, (B) Block-out, (C) Attaching a dummy for space maintaining of the magnet, (D) Corrective located magnet assembly, (E) Try-in, (F) Trimming and polishing excessive resin.

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  Fig. 13 Panorama radiographic view of first delivery of the overdenture.

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  Fig. 14 Panorama radiographic view using 10 years after first delivery.

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  Fig. 15 10 years follow-up check after delivery. (A) Intraoral photo, (B) Overdenture (cracked surfaces are relining material).

Reference

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