Tooth loss has always been a challenge in dentistry due to the physiological alterations that occurs to the bone structure following extraction. The available treatment options are not able to prevent alveolar ridge collapse nor recreate the volume of bone lost. The concept of partial extraction therapies (PET) uses the tooth structures to maintain the bundle bone and the alveolar bone, thereby revolutionizing implant dentistry, particularly in cosmetically challenging areas. The overall objective of the studies included in this thesis was to provide proof of concept for PETs in terms of clinical application and long-term results, including implant survival, reproducibility, efficacy and safety of this approach. Immediate implant placement combined with the socket shield seems to provide similar survival rates as conventional immediate implants, with better results for bone levels and pink aesthetic scores. Root submergence and pontic shield techniques have the potential to preserve alveolar bone in pontic areas and under removable prosthesis and dentures, however, more studies are necessary to further validate these techniques. The use of PET holds promise in terms of maintenance of three dimensional ridge volume, aesthetics, safety and reliability. Additional prospective studies, particularly controlled clinical trials with larger samples and long follow-up are required to further explore this treatment strategy
