are these two conditions different histologically? are they a process of repair or regeneration, are they epithelial or fibrous attachments. opened for discussion.
new attachment is the embedding of NEW periodontal ligament fibers into NEW cementum and the attachment of gingival epithelium to a tooth surface PREVIOUSLY DENUDED BY DISEASE.
Whereas, the attachment of gingiva or PDL to areas of tooth from which they have been removed in the course of treatment (or during preparation of teeth for restorations) represent simple healing or reattachment not new attachment.
Eg,. Reattachment takes place after surgical detachment of tissues or following traumatic tears in cementum, tooth fractures or treatment of periapical lesions.
for detail please refer Carranza's Clinical Periodontology, Chapter: Rationale for periodontal treatment
Yes, I would like to think so. Reattachment as repair and New attachment as regeneration. Am out right now, Will backup my statement with relevant articles in few hours.
how about when the attachment weaken but still intact (not completely destroyed) when highly infiltrated by inflammatory cell and inflammation fluid, at this stage resistance to probe penetration during examination will be highly reduced. However, after treatment and resolution of the inflammation, when inflammatory cells and fluid replaced by fibers again and resistance to probe penetration will be increased. Under which category we consider this phenomenon? re attachment or new attachment or may be both?
even in incompletely destroyed periodontal tissue, I suppose new-attachment formation would take place, as the remodeling process is always happening. Reattachment occurs more in cases of clean injuries/trauma,
But then most studies show histologically new attachment and reattachment are not statistically different.
I hope following articles might be of some help, couldn't find more recent ones.
Article New attachment – reattachment following reconstructive perio...
Article New attachment Formation on teeth with a reduced but healthy...
Article New attachment following surgical treatment of human periodo...