Patients were treated with either a polyurethane foam hydrophilic dressing (Allevyn) or a calcium sodium alginate dressing (Kaltostat).
However, there has been one report of a florid foreign body giant cell reaction seven months after the use of an alginate dressing to obtain haemostasis in an apicectomy cavity on an upper lateral incisor.
The case suggests that alginate fibres left in situ may elicit a long-lasting and symptomatic adverse foreign body reaction.
Alginate have been used in various forms for fifty years, and yet they remain a poorly understood and probably underused dressing.
Compared to many modern dressings, the literature is sparse and inconclusive.
The authors suggest that alginates should be reserved for problematic haemorrhage and be removed from the tooth socket soon after haemostasis .