The Leicester radiotherapy bite block: an aid to head andneck radiotherapy

Hollows, P.; Hayter, J.P.; Vasanthan, Subramaniam

doi:10.1054/bjom.2000.0558

Cited by 13 publications

(19 citation statements)

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“…Although many authors have reported the benefits of using an intraoral stent to ensure consistent reproducibility of patient positioning during radiation therapy, few have been able to quantify the stability. Lopatta et al and Baumert et al conducted clinical trials to measure the effects of intraoral stabilization on the reproducibility of patient positioning throughout the course of radiation therapy.…”

Section: Discussionmentioning

confidence: 99%

“…Clinical reports have described the fabrication of repositioning stents using acrylic resin . Only 2 studies have attempted to assess the influence of an intraoral repositioning stent on reproducibility of patient positioning; however, unlike the current study, in that study, intraoral stents were attached to extraoral frameworks .…”

mentioning

confidence: 96%

“…To minimize the damage to normal tissues, thermoplastic masks are used to immobilize patients and minimize variations in patient setup during the entire course of radiation therapy. These masks may stabilize the head and neck, but they may also allow for movement of the tongue and mandible, as they are not static structures . The mandible has the ability to move up to 11 mm from a fully retruded to fully protruded position, and up to 20 mm from full left to full right laterotrusion .…”

mentioning

confidence: 99%

“…These masks may stabilize the head and neck, but they may also allow for movement of the tongue and mandible, as they are not static structures. 5 The mandible has the ability to move up to 11 mm from a fully retruded to fully protruded position, and up to 20 mm from full left to full right laterotrusion. 6 Even with a patient in a fully supported supine position, such as on the treatment table, the mandible can move up to 4 mm in an inferior direction from full maximum intercuspation.…”

mentioning

confidence: 99%

“…Clinical reports have described the fabrication of repositioning stents using acrylic resin. 5,8,[10][11][12][13] Only 2 studies have attempted to assess the influence of an intraoral repositioning stent on reproducibility of patient positioning; however, unlike the current study, in that study, intraoral stents were attached to extraoral frameworks. 14,15 As a result, the current feasibility study was conducted to determine if a newly proposed stent design can provide clinically acceptable stability of patient po-…”

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confidence: 99%

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The Fabrication of an Acrylic Repositioning Stent for Use During Intensity Modulated Radiation Therapy: A Feasibility Study

Lee

Nguyen

2019

Journal of Prosthodontics

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Purpose Radiotherapy is one of the main treatment modalities for head and neck cancers. To minimize damage to normal tissues during radiotherapy, various methods of stabilization have been used, including thermoplastic facemasks and repositioning stents. The goal is to assess the effect of using a customized oral repositioning stent on patient positioning during the course of radiotherapy. Materials and Methods Ten consecutive patients scheduled to undergo intensity modulated radiation therapy (IMRT) for cancers of the maxillary sinus, nasal cavity, or oral cavity were recruited to participate in the study (ST group). These patients were matched to 2 retrospective cohorts, one using the original repositioning stent design (OB group), and the other with no stabilization stent (NB group). Hard baseplate wax was used to create a customized wax pattern of the proposed acrylic stent chairside, and processed in heat‐cured clear hard acrylic. Relative stability of the daily patient setup was assessed by comparing measurements from surrogate bony landmarks to radiation isocentres obtained from the initial reconstructed planning computed tomograph (CT) to each daily KeV image. Results There was no stent fracture or distortion throughout treatments, and no patients’ treatments were required to be aborted, delayed, or replanned. Mean 3D deviations for the ST, OB, and NB groups were 0.29 ± 0.10 cm, 0.32 ± 0.14 cm, and 0.31 ± 0.13 cm, respectively. The ANOVA test revealed no significant difference in triangulated variations between the treatment groups (F = 0.18, p = 0.84). Patient stability data demonstrated mean vertical, longitudinal, and lateral variations that did not appear different when compared to 2 retrospective cohorts. Although the deviations were not statistically significant between matched cohorts, the added durability of the stent and comfort for patients, without affecting IMRT timeline, are considered clinically significant. Conclusion By using a customized repositioning stent, it is possible to maintain patient stability comparable to prior protocols and within the range of clinical guidelines, while providing superior comfort and ease of insertion to the patients.

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Section: Discussionmentioning

confidence: 99%

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confidence: 96%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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