Spectrophotometric in vitro study
vendredi 25 mai 2018
Impact of abutment material on mucosa discolouration investigated
It has been reported that titanium implant abutments can cause discolouration in the surrounding tissue types. This is most frequently reported in patients with a thin mucosal biotype. Some recent studies have observed positive aesthetic results following the use of surface modifications such as titanium nitride coatings. In a recent study, researchers from Germany tested various abutment materials in different mucosa thicknesses to evaluate their effect on discolouration.
The abutment materials included in the study were: titanium, titanium nitride, and zirconia (with and without ceramic veneering in various combinations). The materials were tested in vitro in a pig maxilla. To simulate different mucosa thicknesses, several connective tissue grafts were harvested, resulting in test mucosa layers of 1.5, 2 and 3mm thicknesses. Colour differences were measured by spectrophotometric assessment.
The results showed that all tested materials led to a discolouration of mucosal tissue. As expected, more discolouration was observed in instances of thinner mucosa. In terms of the abutment materials, titanium nitride was found to have the best aesthetic results in cases of 1.5mm soft tissue. In cases involving tissue thickness of 3mm, the colour differences between the various abutment materials were found to be negligible.
This study was presented as an e-poster at the 2017 EAO Congress.