Aim. Is to effectuate a micro structural analysis on the response of peri-implant tissues on different healing abutments surfaces and morphologies. Methods. Standard Titanium healing abutments (EP Healing Abutments, Biomet 3i, Palm Beach Gardens, FL) were duplicated and reproduced with reduced diameter of 1 mm using LR white inclusion resin. Then were coated with a layer of gold of about 20μm thick to have fine sections. After a four weeks healing period the tissue in excess was removed through plastic surgery remodeling the peri-implant mucosa similar to that of natural teeth. The specimens from three patients were analyzed. Results. The oral side demonstrated a flattened stratified epithelium supported by a tunica propria. The connective tissue papillae penetrates the epithelial layer into vessels and nerves. While the implant side was free of epithelial wedges. Collagen fibers had a variable orientation and in some areas an inflammatory infiltrate was present. There is a statistically significance difference (P=0,004) on vessel density between groups. Conclusions. The peri implant soft tissue on machined Titanium HA presents a scarce inflammatory infiltrate and a casual collagen fibers organization. The presence of a tear para- keratinized epithelium in some areas let some interrogatives on the screwing and un screwing clinical techniques. Moreover, if this is associated to the poor presence of vessels and papillae on connective tissue.
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