ABSTRACT
AIM: This study tested the hypothesis that the cure behaviour (depth of cure and polymerization contraction) of light-activated pattern materials was no worse than that of light-activated composite resins, allowing them to be handled in a similar fashion. METHODOLOGY: Depth of cure was measured by a penetrometer method. RESULTS: Cure depths were comparable to those of composite resins, ranging from 3.52 mm (Lumin-X paste) to 6.76 mm (Visioform) after visible light activation for 30 s. There were significant differences in the depth of cure of the three materials tested (P < 0.001). Polymerization contraction was assessed by a minimal load transducer method. Values ranged from 0.45% (Lumin-X paste) to 1.89% (Visioform), lower than that of composite resins. There were significant differences in the polymerization contraction values for each of the three materials (P < 0.001). CONCLUSIONS: It was concluded that light-activated pattern materials cure in a manner comparable to composite resins, and may be built up incrementally in a similar fashion.
Subject(s)
Dental Marginal Adaptation , Dental Restoration, Permanent/methods , Analysis of Variance , Composite Resins/chemistry , Light , Materials Testing , Methacrylates/chemistry , Polymers/chemistry , Polyurethanes/chemistryABSTRACT
We describe three patients who presented with atypical mycobacterial infection. Although antituberculous drugs are ineffective, combination treatment with clarithromycin or amikacin and ciprofloxacin (with or without cotrimoxazole) leads to eventual resolution of the lesions. The treatment of choice, however, remains complete excision of the affected area which obviates the need for prolonged chemotherapy and minimizes the scarring which may otherwise develop after conservative treatment.
