CONTACT ALLERGY TO DENTAL RESTORATIVE MATERIALS IN PATIENTS WITH ORALLICHENOID LESIONS

118 patients with oral lichenoid lesions (OLL) topographically related to dental fillings were patch tested (PT) to reveal contact allergy t o restorative materials. 80 (67.8%) patients displayed positive PT rea ctions to metals of dental filling materials: 76 reactions were found to various mercury compounds, 4 to sodium aurothiosulphate, 3 to stann ic chloride and 2 to silver nitrate. The positive patch test reactions appeared more commonly in patients with restricted contact lesions (8 5.1%, type-1 lesions) as compared to patients with lesions exceeding t o the adjacent areas (38.6%, type-2 lesions). The replacement of denta l fillings was carried out in 62/80 PT-positive and 15/38 PT-negative patients. 28 out of 62 (45.2%) PT-positive and 3/15 (20%) PT-negative patients showed complete healing of OLL after a mean follow-up time of 16 months. Complete healing occurred in 29/54 (54.0%) type-1 and 2/23 (8.7%) type-2 lesions. Topographical relation between the lesion and the filling material (restricted versus exceeding the contact area) in dicated association of OLL lesion an: the filling material, which coul d be further confirmed by patch testing in the majority of patients. T he patch test series should include mercuric chloride (0.1%), mercury (0,5%) and mercury ammonium chloride (1.0%), each in pet. (C) Munksgaa rd, 1997.