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dentistry techniques implant dental dental implants implant dentistry procedures healing microstructure resorption surface modifications osseointegration implants powerpoint advantages immediate posterior single tooth situations anterior guidelines presentation planning sac classification adin aesthetic zone rakesh chandran surgery students lecture classification ridge augmentation wound healing oral cavity soft tissue sinus floor elevation augmentation sfe maxillary sinus bone grating autogenous photobiomodulation laser development alveolar bone composition mineralisation