One of those irritating "further study required" conclusions, but the link with amalgam appears weak so far. Size may matter though, (of fillings):
Dental amalgam and multiple sclerosis: a systematic review and meta-analysis.Aminzadeh KK, Etminan M.
Center for Clinical Epidemiology and Evaluation, Vancouver Hospital, Vancouver, Canada.
OBJECTIVES: Amalgam restorations have long been controversial due to their mercury content. Allegations that the mercury may be linked to nervous disorders such as Alzheimer's, chronic fatigue syndrome, and ...