Über den Autor
Fickl S, Stappert, Schulze-Riewald, Schlagenhauf
Scar tissue formation following ridge preservation techniques – a retrospective controlled clinical study
The aim of this retrospective controlled clinical study was to compare a porcine collagen matrix (Geistlich Mucograft® Seal, Geistlich Pharma AG, Wolhusen, Switzerland) with a free gingival punch-graft harvested from the palate for ridge preservation with respect to size, invagination and colour of resulting soft-tissue scar formation.
Background and aim
Ridge preservation has been shown to reduce tissue atrophy following tooth extraction1,2. Among various techniques for ridge preservation the combination of a deproteinized bovine bone mineral with an autologous punch graft has demonstrated to be an effective technique to reduce postoperative ridge reduction3,4. Recently a porcine collagen matrix has been introduced as an alternative for autologous punch grafting5,6. Clinically soft-tissue grafting seems to be associated with scaring of the adjacent soft-tissue complex.
Methods and materials
In total 22 patients were included in this study. Group A consisted of 12 and group B of 10 patients. In group A the extraction socket was filled with a deproteinized bovine bone mineral (Geistlich Bio-Oss®, Geistlich Pharma AG, Wolhusen, Switzerland) and covered with a free gingival punch graft harvested from the palate. In group B the extraction socket was filled with a deproteinized bovine bone mineral (Geistlich Bio-Oss®) and covered with a porcine collagen matrix (Geistlich Mucograft® Seal). All patients were in need of single tooth extraction and treated between March 2012 and July 2015 by the same surgeon. After final prosthetic reconstruction two independent examiners evaluated size, invagination and colour of the resulting soft-tissue scar using a modified scar-evaluation-scale7. Patient satisfaction was evaluated by a questionnaire. Additionally, patient records were screened for frequency and costs of scar removal treatment. Treatment groups were compared using non-parametric statistics.
The average scar score of group A and group B was 1.33 and 4.3, respectively revealing significantly less scaring in group B (p=0.000295). Patient satisfaction was not statistically significant different between the treatment groups (p=0.711, p=0.809). Frequency and costs of scar removal treatment were statistically significant higher in group A (p=0.000234).
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The results suggest that ridge preservation using a deproteinized bovine bone mineral and a porcine collagen matrix leads to less scar tissue formation when compared to deproteinized bovine bone mineral and free gingival punch grafts from the palate.