Sparing of Contralateral Major Salivary Glands Has a Significant Effect on Oral Health in Patients Treated with Radical Radiotherapy of Head and Neck Tumors
Abstract:The conscious arrangement of irradiation portals in order to spare contralateral major salivary glands in patients with radical radiotherapy of ENT tumors has a significant influence on the oral environment: the stimulated saliva flow is higher, the buffer capacity retains the baseline value, the saliva pH remains basic, and the colonisation with Streptococcus mutans is reduced.
“…Although radiation doses are similar, radiation fields differ considerably between patients with head and neck cancers and patients with DTC. In particular, marked toxicity of the mucosa of the mouth and impairment of salivary function are frequent in patients with oropharyngeal tumors [2]. This may account for the fact that the observed toxicities in the present study of radiotherapy in DTC are somewhat lower than the experiences from head and neck series.…”
The majority of patients experience mild to moderate side effects from adjuvant external-beam radiotherapy. At the first follow-up examination, most side effects have subsided. Acute toxicity is tolerable in these patients.
“…Although radiation doses are similar, radiation fields differ considerably between patients with head and neck cancers and patients with DTC. In particular, marked toxicity of the mucosa of the mouth and impairment of salivary function are frequent in patients with oropharyngeal tumors [2]. This may account for the fact that the observed toxicities in the present study of radiotherapy in DTC are somewhat lower than the experiences from head and neck series.…”
The majority of patients experience mild to moderate side effects from adjuvant external-beam radiotherapy. At the first follow-up examination, most side effects have subsided. Acute toxicity is tolerable in these patients.
“…Conventional head-and-neck (H&N) radiotherapy (RT) is associated with high doses to the major salivary glands resulting in xerostomia as major distressing complication, changes of taste, dental decay, oral infections, dysphagia, nutritional deficiencies, and impaired social activity [3,4]. Parotid glands are responsible for 卤 65% of the total amount of saliva.…”
With the use of heLical tomography the parotid gland function can largely be preserved since the mean dose to the entire gland as well as glandular volume receiving >26 Gy can be reduced.
“…The latter is driven by inverse planning approaches and computerized optimization modules which require certain input data [2,5,10,12,13,18,19,29,30,34,35]. Parotid gland sparing is one main motivation for IMRT in the head-and-neck region.…”
the mean dose, aV40 or aV26, revealed similar correlations with the excretion rate and with recovery. Hence, also absolute volumes can be used for treatment planning. Longer recovery times show higher ED50 values indicating partial regeneration of gland functions.
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