Radiation-related caries and early restoration failure in head and neck cancer patients. A polarized light microscopy and scanning electron microscopy study.
BACKGROUND
Radiation-related caries is a disease with high potential of teeth destruction in patients who have undergone radiotherapy in the head and neck region. Also, it is a challenge for dentistry due to high rates of recurrent caries and early restorations failure.


OBJECTIVE
This study aims to analyze the early restoration failures in order to better understand the etiology of dental restorations reduced longevity in irradiated teeth.


METHODS
Fifteen restored permanent teeth extracted from 11 patients who had finished head and neck radiotherapy were studied. Sections from each tooth were prepared and a qualitative description of the interface between restorations and dentin was performed by using polarized light microscopy and scanning electron microscopy.


RESULTS
Unfavorable anatomical shape of restorations, residual caries, and secondary caries affecting dentin adjacent to restorative materials were widely found. The morphological patterns of these carious lesions were similar to conventional dentin lesions with superficial demineralized zone and translucent zone.


CONCLUSIONS
Early dental restoration failure in teeth affected by radiation-related caries may have the same etiological factors from ordinary dental restoration failure and direct radiogenic damage to dentition would not be essential to early restorations failure in radiation-related caries.
Oral Pathology Department (Semiology Area), Piracicaba Dental School, Campinas State University (UNICAMP), Piracicaba, São Paulo, Brazil. alanroger@fop.unicamp.br
Alan Roger S
AR
Silva
Fabio A
FA
Alves
Sandrine B
SB
Berger
Marcelo
M
Giannini
Mario F
MF
Goes
Marcio A
MA
Lopes
D000328:Adult; D000368:Aged; D016371:Cranial Irradiation / Q000009:adverse effects*; D003731:Dental Caries / Q000209:etiology / Q000628:therapy*; D019232:Dental Restoration Failure; D003804:Dentin / Q000473:pathology; D005260:Female; D006258:Head and Neck Neoplasms / Q000150:complications* / Q000532:radiotherapy; D006801:Humans; D008297:Male; D008855:Microscopy, Electron, Scanning / Q000379:methods; D008859:Microscopy, Polarization / Q000379:methods; D008875:Middle Aged; D011832:Radiation Injuries / Q000628:therapy*; D011878:Radiotherapy / Q000009:adverse effects; D017211:Treatment Failure