A case repot of the implant overdenture using Magfit SX2®.
Kei Hasegawa, Kei Sakakibara, Sho Hirota, Kazuya Shimamoto,
Ryo Watanabe, Hiroaki Yamamoto, Masatoshi Iwahori and Motonobu Miyao
Department of Prosthodontics Division of Oral Functional Sciences andRehabilitation. Asahi University School of Dentistry
Abstract

A 76 - year - old man with a chief complaint of a masticatory
disturbance with his upper denture came to our hospital in
September 2010. Although we fabricated the upper acrylic resinbase denture, the patient was not satisfied. Then, after consulting,
we fabricated an implant overdenture.
In the case of the implant overdenture, it is difficult to get awell-balanced adjustment for the amount of tissue displacement
between the mucosal surface and the implant abutment. In somecases the attachment may not obtain suction by the mucous
membrane. Magfit SX2® which was used in this case has a
0.4mm range of motion which is approximate for the amount oftissue displacement. We fabricated the implant over denture withMagfit SX2® using this procedure in order to take advantage ofthis attachment’s characteristics and shorten the treatment time.
Four years have passed since insertion of this denture; thefunction has been working well and also the patient is currently
satisfied. It seems this method can easily acquire the balance ofamount of tissue displacement.

Introduction
Magnetic attachments have been medically approved and 4-th
half a century became common as an abutment device fordentures, and it has also qualified for national exams of dentistry.
In the case of a natural tooth as an abutment, there isinterference capability for the displacement amount of about 70
μm due to the periodontal ligament. However, in the case of theosseointegrated oral implant abutment, adjustment of thedisplacement amount of the mucosa and the pressure of theimplant, it often depends on clinical experiences, such as design,implant implantation position and impression pressure.

Magfit SX2®
（Self adjust type）
Structure and material
Magnetic assembly

POM(polyacetal)

When stretched

The cap can be inclined by 0.4 mm or 8 ° in thevertical direction according to the movement ofthe denture. The fitting force of the cap is about
15 Kgf.
Fig. 1 Magfit SX2® (self-adjust type)This figure shows the schematic diagram of a Magfit SX2®
(self-adjust type) which has the loose pressure capability, which
was used this time (Fig. 1). In this issue, we will introduce themethod of denture fabrication taking the Magfit SX2® into
consideration for adjustment of pressure displacement amount.

Outline of caseA 76 - year - old man with a chief complaint of masticatory
disturbance with his upper denture came to our hospital in
September 2010. His current medical history hopes to produce a
new denture, because the upper complete denture which wasmade three years ago is unable to chew much. His past history ischolecystectomy and ossification of posterior longitudinal
ligament. He is currently using an upper complete denture which
has no spillway and an anti-Monson curve condition. Moreover,because the denture margin is short, due to posterior osteoporosis,
I made an upper-jaw resin denture together with the patient's
desire. However, he was not satisfied; therefore, I decided toproduce a magnet implant overdenture with the implant hopefrom the patient.

BeforeAfter

Fig. 2 X-ray photograph before and after implant placement surgery

Shows panoramic X-ray images before and after implant
implantation (Fig. 2). Absorption of the maxillary alveolar bone isrecognized, but in March 2011 we implanted a 4.3 mm x 13 mm
tapered implant at the maxillary bilateral canine tooth and thesecond molar tooth (17, 13, 23, and 27).

Therapeutic procedures
We surgically removed the stent for implantation with reference
to the denture made at the first visit and after the first operation
second operation, since the outer mucosal symptoms on the buccal
side of the second molar teeth on both sides were remarkable.
After that observation was done using mucosal conditioning
material. For the final denture production, we made a pilot
denture, duplicated it and attached the magnet structure to thedenture after the metal floor denture was made, and completed it.

Fig. 3 Working cast・Record base with occlusion rim・Wax denture

The pilot denture working model, the occlusal floor and thecrescent teeth are shown (Fig. 3). The implant was planted in agood position by using the dental prostheses made at the initial
visit for examining the implant implantation position.

Fig. 4 Wax denture・bite seating impression・finished denture

A crescent tooth and bite impression and a completed denture
are shown (Fig. 4). The fitting of the pilot denture was also good.

Installation of denture

After 5days
After 15days
Fig.5 Mucosal surface matching state

The temporal course of mucosal surface and the change inconformity state at occlusion are shown (Fig. 5). Compliantcondition was improved five days and fifteen days after wearing
the denture.

Fig. 6 Impression of the pilot denture

The bite-seating impression using the pilot denture is shown(Fig. 6). The fitting and occlusion of the pilot denture was also
good. The bite-seating impression and the pilot denture with
instructions on the finishing line and palate denture margin have

been written in.

Fig. 7 Working cast and Wax denture

The working cast and wax denture are shown (Fig. 7). A buccal
side core, arrangement of artificial teeth, and finished wax
dentures were obtained.

Fig. 8 Finish denture and Put magnetic attachment on the denture

The impression for the finished denture and the magnetic
attachment put on the denture are shown. From the thicknessof the impression material it can be seen that the fit of thedenture is good. On the model after injection of gypsum in thelaboratory, the magnet structure was attached to the denture(Fig. 8).

Fig. 9 After inserting dentures

The patient is shown after putting on the denture (Fig. 9).
The fitting and maintaining power of the denture was good,
and the patient was also satisfied with the oral sensation by
the palatal denture base. Due to the stabilization of themaxillary dental prosthesis, the bridge of the mandible had
been worn for about two years and was confirmed to be flushed.
After the tooth extraction, it became a complete denture.

Fig. 10 Three years and six months after providing patient with dentures

An intraoral photograph after three years and six months isshown (Fig. 10). The occlusion stabilized by making the lower jaw
into a complete denture.

Fig. 11 Four years and three months after providing patient with dentures

Photographs of the inside of the mouth and the dentures after
four years and three months are shown (Fig. 11). Although fiveyears have not passed, I was satisfied when the patient visited
last month and was satisfied.

Discussion
It is difficult to adjust the pressure amount of the implant partin a well-balanced manner, and in some cases the attachment
may not be adsorbed due to repulsion of the mucosal tissue.
Gonda et al. Show that a self-adhesive type of attachment isclinically advantageous over other attachments.¹⁾ The Magfit
SX2® which was used this time has a range of motion of 0.4 mm,
which is close to the amount of pressure displacement of themucosa. Furthermore, the denture was made considering its
characteristics and impression pressure control. It is thought tobe method which makes it easy to balance the displacement
amount of implant and mucosa pressure, even for dentist who do
not have clinical experience, since the patient has satisfactorily
functioned well now, even after four years have passed since its
installation.

Conclusion
Furthermore, the denture was made considering its
characteristics and impression pressure control. It is thought tobe method which makes it easy to balance the displacement
amount of implant and mucosa pressure, even for dentist who do
not have clinical experience, since the patient has satisfactorily
functioned well now, even after four years have passed since its
installation.

References
1. Gonda.T , Yang.T , Takahashi.T ,et al. :Functional Properties of Attachments forImplant Overdentures : Comparison among Magnetic Attachments, Anchor andStud Type Attachments,J.Jpn.soc.Oral Implant,22,15-20,2009