To maintain long-term stability of dental implants, it is important to minimize bone loss around an implant. Several clinical studies have shown a mean crestal bone loss of 1.5-2 mm around dental implants, in the first year after prosthetic restoration, as clinically acceptable. To limit this crestal bone resorption, several modifications are being tried in the implant systems. Platform Switching is one such concept, which uses prosthetic abutments with reduced diameter in relation to the implant platform diameter. This moves the implant abutment junction and supposedly the inflammatory reaction medially, away from the crestal bone, and may thus, minimize the crestal bone loss. Although, it was a serendipitous finding, an increasing number of implant systems have incorporated Platform Switching into their designs, as an innovative feature for preserving the peri-implant bone. A Medline search was carried out using the Pubmed search engine, with keywords Platform Switching in Dental Implants. Twenty-one studies (12 random-controlled trials, fourprospective-controlled clinical studies, and five clinical case series) were selected for review after screening of a total of 123 articles on the basis of the inclusion and exclusion criteria. A detailed review of these articles gave a clear tendency toward the positive impact of Platform Switching on crestal bone preservation, but further long-term, randomized-controlled trials, with uniform criteria, are required to confirm these results.

Prosthetic dentistry is one of the fundamental pillars of dentistry. The most effective prosthetic prophylaxis could be the prevention of causes leading to tooth extractions. As a dentist our main aim should be prevention, which not only includes prevention of caries and or periodontal disease but also prevention of residual alveolar bone loss after teeth are extracted Modern treatment options improve the overall prognosis of the stomatognathic system and the quality of life of the affected patients significantly. Preventive prosthodontics highlights the importance of any procedure that can delay or eliminate future prosthodontic problems. The present review was conducted after doing extensive literature search of peer-reviewed journals and extracting information on the concept of preventive prosthodontics. The present paper discusses the concept of preventive prosthodontics engaging all the three levels of prevention-primary, secondary and tertiary. Procedures and prosthetic interventions that can be undertaken in each level are discussed.

Context: The extensive use of desensitizing agents to control incidences of post-cementation sensitivity can variably affect the forces required for debonding of the prosthesis. The available literature offers inconsistent results and is generally carried out using a flat occlusal preparation. Aims: Evaluation of effect of desensitizing agents-nonpolymerizable (Systemp) and polymerizable (Clearfil SE Bond)-on retention of complete veneer castings luted to anatomically prepared teeth with zinc phosphate and glass ionomer cement (ZPC and GIC). Materials and Methods: Seventy maxillary second premolars were prepared conforming to the anatomic form to receive complete veneer castings. Two sets of dies were prepared; one for obtaining castings and second to permit mathematical calculation of the surface area. The specimens were divided into four experimental groups of 15 samples each and two control groups of 5 samples each. Two desensitizers and two luting cements were used. After cementation, the samples were tested at crosshead speed of 0.5 mm/min on universal testing machine (UTM) using a customized self-aligning device. Minimum load required to debond the specimens was recorded. Force value for each specimen was divided by its surface area to obtain the tensile bond strength. Results: Significant reduction in tensile bond strength was noted for all the experimental groups, irrespective of luting cement used. Conclusion: Systemp-glass ionomer group exhibited highest bond strength followed by Systemp-zinc phosphate, Clearfil SE Bond-glass ionomer and Clearfil SE Bond-zinc phosphate group.

Malignant tumors of the nose occasionally require rhinectomy. Facial defects can cause not only functional problems but also some serious physchological problems that could cause the individual to avoid social contact. In view of this, the first aim of maxillofacial rehabilitation should be solving esthetic problems. Implant retained prostheses can give good esthetic results. Predictable biomechanical retention of nasal prostheses can be achieved using osseointegrated implants and intra-oral and craniofacial implants have been used previously. These prostheses are tissue compatible, simple in design and easy to place, can be worn independently of spectacles and in the majority of cases can be provided soon after surgical excision. In this case report, a nasal prosthesis was fabricated for a patient who lost his nose due to the basal cell carcinoma. Extra-oral implants and magnet retention for the proper connection of the nasal prosthesis were used. This prosthesis was acceptable for the patient because of excellent support, retentive abilities and the patient's appearance.