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Introduction

The alveolar ridge experiences significant dimensional changes following tooth extraction due tonormal bone healing pattern. Both vertical and horizontal directions undergo importantmodifications, in particular the bucco-oral dimension of the remaining alveolar crest. Theresorbtion of the buccal plate poses several concerns, especially when implant restoration isplanned in the esthetic area. Various techniques and materials have been developed and

utilized in order to help maintain the buccal plate and bone volume. Maintaining the space andprotecting the blood clot, thus allowing osseous proliferation and maturation, are the principalobjectives for the bone augmentation procedures. The aim of this study was to evaluate thechanges in alveolar bone morphology that occur after extraction at the buccal bone levelfollowing socket preservation procedures with membrane. Also, the effect of a flap or flaplessprocedure was taken into account.

Methods

Bilateral extractions of first mandibular molars were performed for eight beagle dogs includedin this study. On the right side, extractions were performed without elevating a flap and nomembrane was used to cover the sockets (Figure 1). On the contra-lateral side, a full-thicknessflap was elevated prior to extraction. The resulting sockets were split into two groups: onesocket was covered with a non-resorbable PTFE membrane while the other group was left toheal uncovered. Primary closure was not intended in the sites covered with the PTFEmembrane. The membrane was removed two weeks after placement (Figure 1). The socketswere left to heal for a total of eight weeks. Nondecalcified, histologic slides of ~30m werestained with toluidine blue and referred for optical microscopy. Histologic qualitative analysiswas performed.

Resu

Conclus

ALVEOLAR BONE DIMENSIONAL CHANGES FOLLOWING TOOTH EXTRACTION INWITH OR WITHOUT PTFE MEMBRANES: A HISTOLOGICAL STUDY IN

I. Chesnoiu-Matei1, H.S. Texeira1, N. Tovar1, C. Marin2, I.F. Dragan3, P.G. Coe

Figure 1:Surgical protocol:A) Membrane in placeB) Membrane removal

Full flap after 8 weeks healing

B BL L

No flap after 8 weeks healing

RidgeMaintenance

B

Fuaft

Figure 2 : Histological data of Extraction sties treated with or without a PTFE

Full-thickness flap negatively influenced buccal plate resorbtion, howevewith a membrane. The data from the current study demonstrates that a nmodifications following extraction, but enhance the buccal bone quantity a

1New York University College o2Universidade Federal de Santa Ca

3Tufts University School of DentalBA