Indian Journal of Plastic Surgery
An open access publication of Association of Plastic Surgeons of India
Users Online: 1221  
Home | Subscribe | Feedback | Login 
  Navigate here 
  Search
 
  
 Resource links
 »   Similar in PUBMED
 »  Search Pubmed for
 »  Search in Google Scholar for
 »Related articles
 »   Article in PDF (1,253 KB)
 »   Citation Manager
 »   Access Statistics
 »   Reader Comments
 »   Email Alert *
 »   Add to My List *
* Registration required (free)  
  In this article
 »  Abstract
 » Introduction
 »  Materials and Me...
 » Results
 » Discussion
 » Conclusions
 »  References
 »  Article Figures

 Article Access Statistics
    Viewed967    
    Printed16    
    Emailed0    
    PDF Downloaded53    
    Comments [Add]    

Recommend this journal

 


 
 Table of Contents    
ORIGINAL ARTICLE
Year : 2018  |  Volume : 51  |  Issue : 1  |  Page : 66-69
 

Use of a plastic eraser for ear reconstruction training


1 Department of Plastic and Reconstructive Surgery, Showa University, Tokyo, Japan
2 Department of Plastic Surgery, Mandalay General Hospital, Mandalay, Myanmar

Date of Web Publication30-May-2018

Correspondence Address:
Dr. Daichi Morioka
Department of Plastic and Reconstructive Surgery, Showa University, 1-5-8 Hatanodai, Shinagawa-Ku, Tokyo 142-8866
Japan
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijps.IJPS_18_18

Rights and Permissions

 » Abstract 

Background: Microtia reconstruction is a challenging procedure, especially in developing nations. The most complex part is learning how to fabricate a framework from costal cartilage. We herein propose a training regimen for ear reconstruction with the use of a plastic eraser. Materials and Methods: The texture of a plastic eraser made from polyvinyl chloride is similar to that of human costal cartilage. The first step of the training is carving out the sixth through eighth rib cartilages from a block of plastic eraser. The second step is a fabrication of the framework from plastic rib cartilages, referring to a template from the intact auricle. Results: As plastic erasers are inexpensive and universally available, inexperienced surgeons can repeatedly perform this framework training. Following several of these training sessions in developing nations, the co-authors and local surgeons successfully performed their microtia reconstructions in a reasonable operative time. Conclusions: This realistic carving model allows surgeons to gain experience before performing an actual ear reconstruction, even in resource-constrained circumstances.


Keywords: Cartilage framework; costal cartilage; microtia reconstruction; plastic eraser; training tool


How to cite this article:
Erdogan B, Morioka D, Hamada T, Kusano T, Win KM. Use of a plastic eraser for ear reconstruction training. Indian J Plast Surg 2018;51:66-9

How to cite this URL:
Erdogan B, Morioka D, Hamada T, Kusano T, Win KM. Use of a plastic eraser for ear reconstruction training. Indian J Plast Surg [serial online] 2018 [cited 2019 Jun 17];51:66-9. Available from: http://www.ijps.org/text.asp?2018/51/1/66/233554



 » Introduction Top


There have been many plastic surgery missions to treat paediatric patients in developing nations.[1],[2] For most missions, the highest priority conditions include orofacial clefts, tumours, hand deformities and post-burn contractures.[3] Patients with a congenital or traumatic ear deformity have been put at the bottom of the surgery list. In particular, microtia reconstructions during charitable surgical missions have been avoided due to multistage treatments, a time-consuming operation, the difficulty of postoperative care and severe donor-site morbidity including pneumothorax.

One of the co-authors (D. M.) has volunteered his services as a paediatric plastic surgeon since 2003 in Asian countries,[2] where orofacial clefts, large nevi, poly/syndactyly, hypospadias and post-burn contractures have been treated. Recently, however, ear reconstructions have also been performed due to an increase in requests from both local surgeons and patients.

Ear reconstruction for microtia is difficult and one of the most challenging procedures in paediatric plastic surgery.[4] The complex structure of the auricle, along with the inherent difficulty of placing a three-dimensional autologous rib cartilage framework within a tight skin pocket, leads to a broad spectrum of results amongst surgeons.[5] Over the years, while surgical techniques have become more refined, the core concepts remain the same.[5] As artistic sense, surgical aptitude and personal effort are all required for a successful outcome,[3] inexperienced surgeons need training to improve their surgical skills. To that end, a workshop-based instructional programme was successfully conducted in Canada,[6] where a silicone costal cartilage model was employed for the ear framework. Thus far, the use of many different materials for the framework training models has been described, but each has disadvantages including limited availability and/or lack of realism.[7]

We herein present our results using a plastic eraser for ear reconstruction training. This is a cost-effective and realistic material, and the training programme is easily repeated, even in resource-constrained circumstances. In addition, we present our clinical experiences following simulations based on the described training.


 » Materials and Methods Top


We used an A6-sized plastic eraser made from polyvinyl chloride [Figure 1]. The thickness was 10 mm. This eraser is inexpensive (approximately 450 JPY = 4 USD) and available in almost any stationery store in Japan. As the texture of this plastic eraser was found to be very close to human cartilage, we employed it as the material for the ear framework training model.
Figure 1: The first step of framework training using a plastic eraser. Schoolchildren engrave a postcard-sized plastic eraser in art class (a). The conjoint sixth and seventh ribs and a long piece of the eighth rib cartilage are drawn on one of the plastic erasers that was cut out into four pieces (b). The rib cartilage models are carved out and split into two pieces each with a thickness of 5 mm (c)

Click here to view


The first step is to carve out costal cartilage models as if harvested from the right chest. The A6-sized (150 mm × 100 mm) eraser is cut into four pieces (75 mm × 50 mm). The sixth, seventh and eighth costal cartilage models are carved out using a set of chisels and a craft knife; then, they are split into two pieces each with a thickness of 5 mm.

The second step includes fabrication of the framework. An X-ray film template was obtained from the intact auricle of the patient [Figure 2]. Attempting a Brent-type framework,[8] the base frame and antihelix were created from the sixth and seventh conjoint rib cartilage models, and the helical rim was created from the eighth rib. If necessary, the cymba of the concha was made with a remnant piece. Attention should be paid to affixing the helical rim and antihelix to the base block with 5-0 nylon sutures because the plastic eraser is slightly less fragile than real costal cartilages. For carving, however, the texture is very close to that of cartilage. Details are gouged into the framework after all parts are affixed. The co-authors continued this training until the second step (framework fabrication) could be finished within 45 min.
Figure 2: The second step of framework training using a plastic eraser. The base frame and antihelix were outlined on the sixth and seventh conjoint cartilage model by reference to a template obtained from a child's normal ear (a). The base frame and antihelix were carved out using a no. 15 scalpel, and the helical rim was created by longitudinally splitting the eighth rib model (b). All parts are affixed to the base block using 5-0 nylon sutures (c)

Click here to view



 » Results Top


After a simulation using this eraser material and the film template obtained from the opposite normal auricle of a 9-year-old child with unilateral microtia, one co-author (DM) performed his first ear reconstruction outside of Japan in cooperation with local surgeons. While the co-author was performing lobular transposition and undermining the skin pocket, the assistant harvested a block of the sixth and seventh cartilages [Figure 3]. Then, the co-author (DM) carved the base frame and antihelix from the harvested sixth and seventh conjoint cartilages, and the assistant harvested the eighth cartilage. The eighth rib cartilage was thinned longitudinally to serve as the helix. All pieces were connected using No. 38 stainless wires and 5-0 polydioxanone sutures to form a framework while the assistant surgeon closed the donor-site incision. When details were carved into the framework using carving gouges, overcontouring was attempted as the postoperative form is not as conspicuous as the underlying framework. After inserting the framework into the skin pocket, a suction drain was placed, and the contour was packed with paraffin gauze dressing. Total surgical time from initial incision into the lobule until application of a loose, overlying dressing of fluffed cotton was 3 h and 30 min.
Figure 3: Photographic examples of the framework (left image in each pair) and contour after the insertion (right image in each pair). The actual surgery was performed in developing nations after training simulations using plastic eraser models. Patients shown are a 9-year-old male (a and b), a 20-year-old female (c and d) and an 18-year-old male (e and f)

Click here to view


To date, we have performed five microtia reconstructions according to the above process in developing nations. Three patients had a Grade II microtia and two had Grade III. The mean surgical time was 4 h and 10 min. One patient suffered from a small exposure of the cartilage frame, which was treated conservatively with gentamicin ointment. The postoperative course of the other patients was uneventful.


 » Discussion Top


There has been a major emphasis on learning to carve a three-dimensional ear framework from a costal cartilage model.[9] Although training videos are currently available on the internet,[9] repeated practice using a model is essential to develop artistry and surgical skills. Historically, a bar of soap or vegetables, such as potato and carrot, were used as training materials.[7],[9],[10] However, they were not as elastic as rib cartilage and were not as realistic. Although Brent [8] recommended the use of human cadaver rib cartilage for the framework training, the use of cadaver cartilage does not simulate live donor cartilage as it is stiff and brittle; moreover, it is not freely available.[6],[9] Recently, the use of animal cartilages including bovine scapula and porcine rib has been proposed for framework training.[11],[12] Those materials are very similar to human rib cartilage and are relatively available on the market, but they present the potential risk of disease transmission.[9]

To avoid such issues, the training models of costal cartilage made from dental impression material have been recommended.[13],[14] This model is made from silicone and is anatomically accurate. However, it is not possible to carve out the Silhouette of the silicone model using gouges because of its different rigidity compared to the real cartilage.[14] Moreover, it costs 100 USD per silicone framework.[13]

In contrast, the A6-sized plastic eraser that we recommend is 450 JPY (4 USD). Since the eraser is cut into eight pieces and expired nylon sutures are used, it costs only 50 cents for each framework training session. For microtia reconstruction, we believe that repeated training is a more important factor than artistic sense. Using this material, one surgeon can repeat the framework training eight times.

Compared to any other training materials employed previously, ear framework training using a plastic eraser was so realistic that trainees felt as if they were carving real cartilage. It may be a disadvantage that the plastic eraser is slightly less elastic than the rib cartilage of children. Trainees may feel the fragility of the plastic eraser when they assemble the pieces together. However, by practicing with such fragile material, trainees get accustomed to careful tissue handling when it comes to use of the real cartilage.

Another disadvantage may be that the A6-sized plastic eraser is not always universally available. However, large-sized eraser can be obtained through online shopping sites. Even in resource-constrained circumstances, ordinary-sized plastic erasers are available at stationery stores. If 6 of them were glued together into a sheet, they could be used for the same type of training.


 » Conclusions Top


We have found an increased need for treating children with ear deformities in developing countries undergoing economic development. As plastic erasers are cost-effective and universally available, trainees can repeat the carving exercise as many times as they want, including sessions at home. Performing simulations before an actual ear reconstruction should result in reduced operative time. Of course, not only in developing nations but also in any nation, this realistic and repeatable carving model allows surgeons to test their aptitude and gain experience. Currently, a hands-on training workshop using the described model is under consideration in Turkey and Myanmar as well as Japan.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient's parent consent forms. In the form, the patient 's parents have given their consent for their child images and other clinical information to be reported in the journal. The patient's parents understand that their child name and initial will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

 
 » References Top

1.
Nicolai JP, Grieb N, Gruhl L, Schwabe K, Preisser P. Interplast: Five years of the Cochin project. Eur J Plast Surg 1998;21:77-81.  Back to cited text no. 1
    
2.
Morioka D, Yoshimoto S, Udagawa A, Ohkubo F, Yoshikawa A. Primary repair in adult patients with untreated cleft lip-cleft palate. Plast Reconstr Surg 2007;120:1981-8.  Back to cited text no. 2
    
3.
Schneider WJ, Politis GD, Gosain AK, Migliori MR, Cullington JR, Peterson EL, et al. Volunteers in plastic surgery guidelines for providing surgical care for children in the less developed world. Plast Reconstr Surg 2011;127:2477-86.  Back to cited text no. 3
    
4.
Sabbagh W. Early experience in microtia reconstruction: The first 100 cases. J Plast Reconstr Aesthet Surg 2011;64:452-8.  Back to cited text no. 4
    
5.
Cabin JA, Bassiri-Tehrani M, Sclafani AP, Romo T III. Microtia reconstruction: autologous rib and alloplast techniques. Facial Plast Surg Clin N Am2 014;22:623-8.  Back to cited text no. 5
    
6.
Murabit A, Anzarut A, Kasrai L, Fisher D, Wilkes G. Teaching ear reconstruction using an alloplastic carving model. J Craniofac Surg 2010;21:1719-21.  Back to cited text no. 6
    
7.
Wilkes GH. Learning to perform ear reconstruction. Facial Plast Surg 2009;25:158-63.  Back to cited text no. 7
    
8.
Brent BD. Reconstruction of the auricle. In: Mathes S, editor. Plastic Surgery. 2nd ed. Vol. 3. Philadelphia: Elsevier Saunders; 2006. p. 633-98.  Back to cited text no. 8
    
9.
Wilkes GH, Wong J, Guilfoyle R. Microtia reconstruction. Plast Reconstr Surg 2014;134:464e-79e.  Back to cited text no. 9
    
10.
Vadodaria S, Mowatt D, Giblin V, Gault D. Mastering ear cartilage sculpture: The vegetarian option. Plast Reconstr Surg 2005;116:2043-4.  Back to cited text no. 10
    
11.
Shin HS, Hong SC. A porcine rib cartilage model for practicing ear-framework fabrication. J Craniofac Surg 2013;24:1756-7.  Back to cited text no. 11
    
12.
Agrawal K. Bovine cartilage: A Near perfect training tool for carving ear cartilage framework. Cleft Palate Craniofac J 2015;52:758-60.  Back to cited text no. 12
    
13.
Yamada A, Imai K, Fujimoto T, Morimoto K, Niitsuma K, Matsumoto H, et al. New training method of creating ear framework by using precise copy of costal cartilage. J Craniofac Surg 2009;20:899-902.  Back to cited text no. 13
    
14.
Thadani SM, Ladani PS. A new method for training of ear framework creation by silicon dental impression material. Indian J Plast Surg 2012;45:134-7.  Back to cited text no. 14
[PUBMED]  [Full text]  


    Figures

  [Figure 1], [Figure 2], [Figure 3]



 

Top
Print this article  Email this article
 

    

Site Map  |  Home  |  Contact Us  |  Feedback  |  Copyright and Disclaimer
Online since 11th March '04
Published by Wolters Kluwer - Medknow