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 Table of Contents  
Year : 2009  |  Volume : 9  |  Issue : 1  |  Page : 36-38

A technique for the fabrication of a more retentive nasal prosthesis

Department of Prosthodontic, Dental Faculty, Tehran University of Medical Sciences, Tehran, Iran

Date of Web Publication23-Jun-2009

Correspondence Address:
Gelareh Asadi
Prosthodontics Department, Dental Faculty, Tehran University of Medical Sciences, Ghods St, Enghelab Ave. Tehran
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-4052.52873

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Retention is one of the most important considerations in fabricating a successful facial prosthesis. This article presents a technique using two acrylic resin extensions to provide more retention for a nasal prosthesis.

Keywords: Nasal, prosthesis, retention

How to cite this article:
Asadi G, Mirfazaelian A, Mangoli AA. A technique for the fabrication of a more retentive nasal prosthesis. J Indian Prosthodont Soc 2009;9:36-8

How to cite this URL:
Asadi G, Mirfazaelian A, Mangoli AA. A technique for the fabrication of a more retentive nasal prosthesis. J Indian Prosthodont Soc [serial online] 2009 [cited 2022 Jan 27];9:36-8. Available from: https://www.j-ips.org/text.asp?2009/9/1/36/52873

  Introduction Top

Providing adequate retention and airway in nasal prostheses should be considered as it can improve the patient's function and comfort. Most facial prostheses such as nasal prostheses are retained with adhesives and mechanisms including anatomic undercuts, eyeglasses, attachments and magnets. [1],[2],[3],[4],[5] In the last two decades, osseointegrated implants have been used for improving support and retention of the facial prostheses. [6],[7],[8],[9],[10],[11] Each of these methods has its own advantages and disadvantages. Mechanical devices such as eyeglass frames are not useful in patients with a flat residual tissue bed and gravity may cause vertical displacement. Adhesives may be irritating and damage the thin margins of the prosthesis during removal. Implants cannot be used in children and unpredictable tumor sites so practitioners should consider other methods to improve retention. [4],[12]

The use of anatomic undercuts for retaining a facial prosthesis reduces the need for other mechanical retentions or adhesives. The prosthesis should be lightweight with airway space in order to be used as a functional part of breathing.

A nine-year-old girl suffering from total rhinectomy following surgical treatment of rhabdomyosarcoma was referred to the maxillofacial clinic. Chemotherapy and radiotherapy had been completed two years ago [Figure 1]. Two acrylic resin extensions that enter and touch the nasal cavity floor were used to improve retention. The prosthesis stayed comfortable in place without using adhesives and no evidence of irritation was found at the one-year follow-up.

  Technique Top

After blocking out the undercuts by filling the nasal cavities with lubricated gauze, an impression was made of the defect and adjacent tissues using an irreversible hydrocolloid impression material (Ariadent, Asia Chemi Teb Co., Tehran, Iran) in a semi-upright position in order to minimize tissue bed distortion. Plaster (or casting tape) was used to support the impression. [13] The impression was then poured with the material of choice to achieve a cast and the pattern was sculpted on the facial cast with baseplate wax (Cavex, Cavex Holland, Haarlem, The Netherlands).

The wax pattern adaptation on the patient's face was checked especially in the border areas. In order to get the maximum adaptation with the underlying tissues, functional wax (Correcta wax; Kerr Corp, CA) was added to the borders.

Two rolls of functional wax with the approximate size of 20 mm (length) and 6 mm (diameter) were attached to the inner side of the wax pattern near the nasal holes and molded into the nasal cavity floor. We intended the extensions to touch the nasal floor for adequate support.

An eyeglass frame was used as an additional retentive device (if necessary) and adapted on the wax pattern to prevent over contouring. The wax pattern was hollowed to provide an airway and reduce its weight. [14],[15] An impression was made from the internal surface of the wax pattern with irreversible hydrocolloid material [Figure 2] and the holes (negative imprints of the extensions) were filled with auto-polymerizing clear acrylic resin (Acropars, Marlic co, Tehran, Iran) and put into a pressure pot to be polymerized under pressure and reduce porosities [Figure 3]. The acrylic resin extensions were pulled out of the impression, the flashes were removed and an undercut was made in each acrylic resin extension to increase its retention to the definitive prosthesis and then polished [Figure 4].

The wax pattern was put in the lower part of a flask with the tissue side up [Figure 5]. For the upper part of the flask, an elastic impression material (e.g. Impregum F; ESPE America Inc, Norristown, Pa) was injected around the extensions and the remaining part was filled with gypsum [Figure 6]. After setting the gypsum in the flask, the two parts of the flask were separated and the wax pattern was removed. The acrylic resin extensions were inserted into the holes [Figure 7], a layer of silicon/acrylic primer (Priciplity Medical LTD, South Wales, UK) was applied as recommended by the manufacturer and the flask was filled with intrinsically colored silicon material (Cosmesil , Priciplity Medical LTD, South Wales, UK). The manufacturer's instructions for silicon processing were followed, the definitive prosthesis deflasked, excesses removed, colored extrinsically and delivered to the patient [Figure 8],[Figure 9]. Any pressure points on the nasal extensions were checked and removed.

  Discussion Top

To construct a satisfactory facial prosthesis, the material, retention and esthetics should be considered. Retention is one of the most important considerations in fabricating a successful facial prosthesis. Different methods based on mechanical devices or adhesives have been discussed in literature. The use of anatomic undercuts for retaining a facial prosthesis reduces the need for mechanical retention such as elastic straps and in some instances adhesives may be eliminated. This is advantageous as adhesives are irritating to some patients and damage to the thin margins of the prosthesis can occur during adhesive removal. The prosthesis must be lightweight with airway space in order to be used as a functional part for breathing. The nasal prosthesis described in this article was hollow, with two nasal holes for respiration and two acrylic internal extensions as a retentive and supportive device. The extensions were made of clear acrylic resin to simplify its maintenance. The prosthesis stayed comfortably in place without using adhesive and no evidence of irritation was found at the one-year follow-up.

  Conclusion Top

In patients with a flat tissue bed and insufficient anatomic undercuts, using two acrylic resin extensions into the nasal floor can provide more retention and support for the nasal prosthesis. The method decreases the need for adhesives and mechanical retention and can be used for patients in whom implants and other advanced treatments are not recommended.

  References Top

Nadeau J. Special prostheses. J Prosthet Dent 1968;20:62-76.  Back to cited text no. 1
Javid N. The use of magnets in a maxillofacial prosthesis. J Prosthet Dent 1971;25:334-41.  Back to cited text no. 2
Udagama A, King GE. Mechanically retained facial prostheses: Helpful or harmful? J Prosthet Dent 1983;49:85-6.  Back to cited text no. 3
Dumbrigue HB, Fyler A. Minimizing prosthesis movement in a midfacial defect: A clinical report. J Prosthet Dent 1997;78:341-5.  Back to cited text no. 4
Beumer J, Curtis TA, Marunick MT. Maxillofacial rehabilitation: Prosthetic and surgical considerations. St. Louis: Ishiyaku Euro America; 1998. p. 387-408.  Back to cited text no. 5
Parel SM, Branemark PI, Tjellstrom A, Gion G. Osseointegration in maxillofacial prosthetics. Part II: Extraoral applications. J Prosthet Dent 1986;55:600-6.  Back to cited text no. 6
Tolman DE, Desjardins RP. Extraoral application of osseointegrated implants. J Oral Maxillofac Surg 1991;49:33-45.  Back to cited text no. 7
van Oort RP, Reintsema H, van Dijk G, Raghoebar GM, Roodenburg JL. Indications for extra-oral implantology. J Investig Surg 1994;7:275-81.  Back to cited text no. 8
Tolman DE, Taylor PF. Bone-anchored craniofacial prosthesis study. Int J Oral Maxillofac Implants 1996;11:159-68.  Back to cited text no. 9
Nishimura RD, Roumanas E, Moy PK, Sugai T. Nasal defects and osseointegrated implants: UCLA experience. J Prosthet Dent 1996;76:597-602.  Back to cited text no. 10
Branemark PI, Tolman DE. Osseointegration in craniofacial reconstruction. Chicago: Quintessence; 1998. p. 95-102.  Back to cited text no. 11
Gurbuz A, Kalkan M, Ozturk AN, Eskitascioglu G. Nasal prosthesis rehabilitation: A case report. Quintessence Int 2004;35:655-6.  Back to cited text no. 12
Siadat H, Mirfazaelian A. Use of casting tape for support of an extraoral impression. J Prosthet Dent 2003;90:598-9.  Back to cited text no. 13
Brown KE. Fabrication of a nose prosthesis. J Prosthet Dent 1971;26:543-54.  Back to cited text no. 14
Taicher S, Bergen SF, Rosen A, Levy M, Lepley JB. Hollow polydimethylsiloxane facial prostheses using anatomic undercuts. J Prosthet Dent 1982;48:444-7.  Back to cited text no. 15


  [Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7], [Figure 8], [Figure 9]


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