|LETTER TO EDITOR
|Year : 2019 | Volume
| Issue : 1 | Page : 123-125
Volumetric expansion of ocular defect with progressive conformers: An objective assessment
Himanshi Aggarwal, Vinit Shah, Saumyendra Vikram Singh, Deeksha Arya
Department of Prosthodontics, Faculty of Dental Sciences, King George's Medical University, Lucknow, Uttar Pradesh, India
|Date of Submission||19-May-2018|
|Date of Acceptance||13-Nov-2018|
|Date of Web Publication||07-Jun-2019|
Dr. Saumyendra Vikram Singh
Department of Prosthodontics, Faculty of Dental Sciences, King George's Medical University, Lucknow, Uttar Pradesh
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Aggarwal H, Shah V, Singh SV, Arya D. Volumetric expansion of ocular defect with progressive conformers: An objective assessment. Natl J Maxillofac Surg 2019;10:123-5
|How to cite this URL:|
Aggarwal H, Shah V, Singh SV, Arya D. Volumetric expansion of ocular defect with progressive conformers: An objective assessment. Natl J Maxillofac Surg [serial online] 2019 [cited 2020 Aug 4];10:123-5. Available from: http://www.njms.in/text.asp?2019/10/1/123/259832
Surgeries such as enucleation, evisceration, and exenteration have devastating consequences for the patient. The loss of an eye whether by surgery or trauma often results in scar tissue leading to contraction. Postenucleation socket syndrome (PESS) is a common late complication of enucleation therapy. It is also known as anopthalmic socket syndrome and encompasses several anomalies such as ptosis, superior sulcus deformity, enophthalmos, and ectropion. PESS is associated with severe contracture leading to poor prosthesis esthetics and difficulty in insertion.
Placement of a conformer to fit the contours of the cavity has been advocated to prevent contraction of the socket. Conformers can be either stock or custom fabricated. Progressive expansion therapy involves the fitting of plastic stents or silicone expanders over time to develop the contracted ocular socket for optimal prosthetic results., Surgical correction with graft placement can be tried once the socket has been expanded to improve esthetics.
Use of progressive expansion therapy with custom conformers to increase socket size has been documented in literature. However, volumetric expansion of socket after using conformers has not been quantified. This article aims to quantify this expansion.
A young patient with a history of retinoblastoma treated by enucleation followed by chemotherapy and external beam radiotherapy (EBRT) presented with PESS of the right eye. After thorough evaluation and interdisciplinary consultation, it was planned to manage the severe contraction by progressive expansion therapy followed by reconstructive socket surgery. The treatment plan was explained and informed consent obtained from the parents of the 9 years old. The following technique was followed:
- Make an impression of the anopthalmic socket in irreversible hydrocolloid (Opthalmicmoldite; Milton Roy Co., Sarasota, FL) and pour a two-piece split cast mold from the same [Figure 1] and [Figure 2]
- Fabricate wax pattern on the mold and try in the patient's ocular defect
- Finalize the pattern and invest
- Fabricate custom ocular conformer in clear polymethyl methacrylate (PMMA) resin (Trevalon; Dentsply Pvt. Ltd.,) after dewaxing [Figure 3]
- Prepare a closed cylinder from a 5/10 ml syringe by blocking its nozzle
- Fill the syringe with few ml of water and calculate conformer volume by noting the increase in this volume when placing the conformer in the syringe
- This is considered as the baseline ocular defect/conformer volume
- Instruct the patient to wear the conformer continuously for 3 weeks
- Prepare the sequentially larger custom conformer followings steps 1–4. Measure ocular defect/conformer volume as outlined in step 6 and note the increase in volume
- Repeat procedure at the third visit after another 3 weeks.
Following this, a comparative evaluation of volume expansion with sequentially larger sizes of conformers was done which showed an increase from a baseline of 2.0 to 2.4 ml and further to 2.6 ml [Figure 4] volume increase of approximately 30%.
|Figure 4: Progressively larger conformers. (a) Baseline conformer (b and c) progressively larger sizes of conformer, respectively. Note the increase in volume objectively measured wherein (c) > (b) > (a)|
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At the end of progressive expansion therapy, the patient was prepared to undergo surgery.
Progressive expansion therapy has been documented to be an important part of the management of severely contracted orbital socket. Recently, self-inflating polymer expanders have been introduced. These lens-shaped expanders are implanted in the orbital tissue where they absorb lacrimal fluid from the mucosal socket or tissue fluid and swell. However, it is difficult to customize them and control the amount of expansion.
The method described in this article used is a simple yet accurate and validates expansion achieved by conformer therapy. Objective measurement of expansion offers several advantages such as better visualization of progress and further treatment planning like the size of orbital implant to be used or amount of graft required. Thus, the importance of measuring orbital expansion cannot be underplayed. However, this report is of a stand-alone case, and there may be more advanced instruments available to quantify the expansion. The authors intend to present a thought-provoking idea for further research into the same.
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form the patients have given their consent for their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4]