Novel application of vinylpolysiloxane hearing aid impressio
Administration of radiation in the head and neck cancer patients can present with its own set of unique challenges and dilemmas. The goal of sparing critical structures, while still attempting to deliver therapeutic doses to target tissues, may be limited by tumor location, patient anatomy, and postsurgical defects. Treatment of superficial lesions in the head and neck is a particular obstacle because of the inherent contour irregularities which impact the ability to deliver a consistent dose of radiation.

A bolus is a tissue equivalent material used to overcome irregular surfaces and provide a buildup of dose to the surface receiving the radiation therapy. Custom‐shaped boluses have successfully been applied in the treatment of postmastectomy, paraspinal muscle, and head and neck defects. 3D printers and computer‐driven milling machines are popular methods utilized to create a customized bolus which conforms to the patient in a way that would alleviate any air gaps.

Here presents a case of a 71‐year‐old man with advanced squamous cell carcinoma of the maxilla with extension to the orbit and overlying skin who underwent composite craniofacial resection and orbital exenteration without reconstruction. A bolus material was needed to help deliver adjuvant radiation therapy to this large, irregular surgical defect of the midface and orbital apex. Vinylpolysiloxane, a silicone elastomer traditionally used to craft ear impressions for hearing aids, was adapted to the defect and served as a consistent prosthetic throughout the patient's 6‐week course of radiation.

In summary, The homogeneity and moldable features of vinylpolysiloxane make it an ideal bolus material for delivering therapy to superficial areas of irregular contour in the head and neck region. The cost, simplicity, and efficiency of production using this material offer a distinct advantage over alternative substances or boluses requiring 3D printing.