There was very little difference in healing outcomes as well as modelling of the facial bone wall between the submerged and NS protocols in relation to immediate implant placement in this dog model.

A nine-year-old, male German shepherd dog was presented with a firm, discrete mass lingual to the interdental space of the mandibular left third and fourth premolars. The lesion was excised and diagnosed as fibrous dysplasia of bone based on histopathologic examination. Fibrous dysplasia of bone is a rare, non-aggressive, radiolucent, non-neoplastic lesion considered developmental in origin. Usually observed as a solitary lesion, it has been reported in animals and man in the polyostotic form. The disease process causes deformity of bone which may lead to loss of bone strength. Clinical signs are secondary to site specific problems associated with expansile bone lesions. Oral examination performed 18-months postoperatively indicated no signs of recurrence.

Article type : Original Research Primary stability and healing outcomes of apically tapered and straight implants placed into fresh extraction sockets. A pre-clinical in vivo study

After tooth extraction, healing of the socket takes place with gradual regeneration of bone within the socket. Concurrently, there is loss of apico-coronal height and oro-buccal width of the alveolar ridge due to physiological resorption of the external socket walls, predominantly on the buccal side of the socket (M. G. Araujo & Lindhe, 2005;Cardaropoli et al., 2003). Bone resorption leads to a reduction in the volume of the ridge (Cardaropoli et al., 2006;Schropp et al., 2003). When dental implant therapy is proposed for the replacement of extracted teeth, the post-extraction dimensional changes can hinder the ideal position of the implant for the

Objectives To investigate the dimensional changes following the extraction of maxillary second incisors and to evaluate the influence of deproteinised bovine bone mineral on the healing outcomes. Materials and Methods The second maxillary incisors in nine dogs were extracted bilaterally in a minimally traumatic manner. Deproteinised bovine bone mineral with collagen (DBBMC) and a collagen matrix (CM) was placed in one socket with the contralateral socket left to heal naturally. After 3 months of healing, the dogs were sacrificed and the pre‐maxilla resected. Cone beam computerised tomography scans (CBCTs) were obtained and the specimens prepared for histological preparation and analysis. Surface scans of study models taken pre‐ and post‐extraction were digitally subtracted to analyse volumetric changes. Results All dogs healed uneventfully without any complications. No inflammation was seen, and DBBMC was well integrated into a network of mineralised tissues, bone marrow and connective tissue. The horizontal width of the buccal crest was found to be significantly greater in grafted sockets, but the vertical height to be similar. No significant difference was seen in regard to volumetric changes in sockets over 3 months post‐extraction. Conclusion Maxillary second incisor sockets of dogs grafted with DBBMC post‐extraction had significantly greater horizontal width at the ridge crest compared with ungrafted sockets. Volumetric analysis revealed no significant difference between grafted and non‐grafted sockets, suggesting possible soft tissue thickening post‐extraction to counteract osseous resorption.