Introduction:The word ‘luting’ is derived from a latin word ‘Lutum’ which means ‘mud’. ‘Luting’ is a word that is often used to describe the use of a mouldable substance to seal a space or to cement two components together. Therefore in view of the clinical importance of dissolution of luting cements in the oral environment, an in vitro study was designed to compare the sorption and solubility of commercially available luting cements mainly zinc phosphate, Glass Ionomer cement, Resin Modified Glass Ionomer Cement and Resin Cement after immersion in artificial saliva of different ph values of 5 and 7.Aim:To Compare and Evaluate the sorption and solubility of four luting cements after immersion in artificial saliva of different pH values.Materials and Method:A total of 120 test samples were prepared of which 30 samples of each luting cement were prepared for the purpose of assessing the water solubility and sorptionThese luting cements were grouped as: GROUP- A (Zinc Phosphate cement), GROUP- B (Glass Ionomer Cement), GROUP-C (Resin Modified Cement), GROUP- D (Resin Cement) In these groups, based on immersion of artificial saliva of acidic pH 5 and neutral pH7, the luting cement specimens were subdivided into 2 groups of 15 samples each. The volume (V) of each specimen was calculated using mathematical formula.Conclusion:Resin cement had the highest resistance to solubility and sorption followed by resin modified GIC, Conventional GIC, and Zinc Phosphate which exhibited the least resistance to solubility in both artificial saliva of pH 5 and pH 7.

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Occlusion is considered to be one of the most important factors contributing to implant success. It is an occlusal scheme which reduces the force at the crestal bone and the implant interface. Therefore, it becomes imperative for the clinician to be well versed with the different concepts when rehabilitating with implant prosthesis. The occlusal rehabilitation schemes for implant-supported prostheses are derivatives of the occlusal scheme for natural dentition. The implant-protected occlusion (IPO) scheme has been designed to obtain an improved longevity of both the dental implant and the prosthesis. The article reviews the concepts of IPO and their different clinical applicability. Keywords: Dental Implant, Occlusion, Implant Protected Occlusion (IPO).