The potential benefit of socket preservation therapies was demonstrated result ing in significantly less vertical and horizontal contraction of the alveolar bone crest .
The scientific evidence does not provide clear guidelines in regards to the type of bio material , or surgical procedure , although a significant positive effect of the flapped surgery was observed .
There are no data available to draw conclusions on the consequences of such benefits on the long-term outcomes of implant therapy
OBJECTIVE This systematic review aims to evaluate the scientific evidence on the efficacy in the surgical protocol s design ed for preserving the alveolar ridge after tooth extraction and to evaluate how these techniques affect the placement of dental implants and the final implant supported restoration .
Xenograft versus extraction alone for ridge preservation after tooth removal: a clinical and histomorphometric study.
BACKGROUND The preservation of bone volume immediately after tooth removal might be necessary to optimize the success of implant placement in terms of esthetics and function . The objectives of this r and omized clinical trial were two-fold : 1 ) to compare the bone dimensional changes following tooth extraction with extraction plus ridge preservation using corticocancellous porcine bone and a collagen membrane ; and 2 ) to analyze and compare histologic and histomorphometric aspects of the extraction -alone sites to the grafted sites . METHODS Forty subjects who required tooth extraction and implant placement were enrolled in this study . Using a computer-generated r and omization list , the subjects were r and omly assigned to the control group ( EXT ; extraction alone ) or to the test group ( RP ; ridge-preservation procedure with corticocancellous porcine bone and collagen membrane ) . The following parameters were assessed immediately after extraction and 7 months prior to implant placement : plaque index , gingival index , bleeding on probing , horizontal ridge width , and vertical ridge changes . A bone biopsy was taken from the control and test sites 7 months after the surgical treatment . Histologic and histomorphometric analyses were also performed . RESULTS A significantly greater horizontal reabsorption was observed at EXT sites ( 4.3+/-0.8 mm ) compared to RP sites ( 2.5+/-1.2 mm ) . The ridge height reduction at the buccal side was 3.6+/-1.5 mm for the extraction -alone group , whereas it was 0.7+/-1.4 mm for the ridge-preservation group . Moreover , the vertical change at the lingual sites was 0.4 mm in the ridge-preservation group and 3 mm in the extraction -alone group . Forty biopsies were harvested from the experimental sites ( test and control sites ) . The biopsies harvested from the grafted sites revealed the presence of trabecular bone , which was highly mineralized and well structured . Particles of the grafted material could be identified in all sample s. The bone formed in the control sites was also well structured with a minor percentage of mineralized bone . The amount of connective tissue was significantly higher in the extraction -alone group than in the ridge-preservation group . CONCLUSIONS The ridge-preservation approach using porcine bone in combination with collagen membrane significantly limited the resorption of hard tissue ridge after tooth extraction compared to extraction alone . Furthermore , the histologic analysis showed a significantly higher percentage of trabecular bone and total mineralized tissue in ridge-preservation sites compared to extraction -alone sites 7 months after tooth removal
The potential benefit of socket preservation therapies was demonstrated result ing in significantly less vertical and horizontal contraction of the alveolar bone crest .
The scientific evidence does not provide clear guidelines in regards to the type of bio material , or surgical procedure , although a significant positive effect of the flapped surgery was observed .
There are no data available to draw conclusions on the consequences of such benefits on the long-term outcomes of implant therapy
OBJECTIVE This systematic review aims to evaluate the scientific evidence on the efficacy in the surgical protocol s design ed for preserving the alveolar ridge after tooth extraction and to evaluate how these techniques affect the placement of dental implants and the final implant supported restoration .