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The need to use a natural alternative for disinfecting dental impression materials, which should be biocompatible and effective, led us to evaluate the efficacy of Aloe vera as a disinfectant by immersion and spray method on alginate impression material and its effect on the dimensional stability of the resultant gypsum cast. The efficacy of the disinfection procedures against Staphylococcus aureus, Pseudomonas aeruginosa, and Candida albicans was evaluated by determining the number of colony-forming units (CFU) recovered after disinfection of alginate discs inoculated with 1x106 CFU for defined intervals with aloe vera solution (99.96%). Dimensional stability was determined from the mean percentage deviation of three measurements that were taken between the fixed points on the casts using a traveling microscope and compared with corresponding measurements from the master model and controls. Statistical analysis of data was determined by analysis of variance. We found out that there is a mean percentage reduction in colony count of S. aureus, P. aeruginosa, and C. albicans after 3 minutes of immersion in aloe vera and after 3 minutes spray disinfection. Complete elimination of all the microorganism cells after 7 min immersion and spray disinfection. There was a statistically significant difference in the increase of the mean anteroposterior (AP) and cross arch (CA) dimension after 3 and 7 minutes immersion in aloe vera. Spraying with aloe vera for 7 minutes was proved to be the most effective disinfection procedure without altering dimensional stability.

Dental implants made of titanium for replacement of missing teeth are widely used because of ease of technical procedure and high success rate, but are not free of complications and may fail. Out of all the failures related to implants, prosthetic failures amounts the most. Among prosthetic failures, fracture of the prosthetic screw is very common and continues to be a problem in restorative practice and it is a great challenge to remove the fractured screw conservatively. There are various techniques and instrument kits which are available for retrieval of fractured abutment screw. However, there is a lot of ambiguity among the implantologist regarding their use and practice. This article reviews the basic instrumentation concept, stepwise procedure and other technicalities related to the same. This article also enlightens various unconventional methods which are reported in the literature.

ABSTRACT: AIM: The purpose of this study was to compare the wettability of three saliva substitute (Saleva, Wet Mouth and GC Dry Mouth) to four denture base materials (Heat cured, High Impact, Nylon and Cobalt – Chromium metal base). Materials and Methods: A total of 60 samples were made, 15 each of the four denture based materials used that are Heat cure PMMA, High impact PMMA, Nylon based denture base and cobalt chromium based denture base. Three commercially available saliva substitutes Saleva, Wet Mouth and GC Dry Mouth were taken to compare the wettability of the denture base materials with the help of Contact Angle Goniometer. Results: According to the result derived from this study, the nylon based denture base material was the most easily wettable denture base material while the greatest hysteresis value was offered by Wet Mouth saliva substitute. Conclusion: 1. It was concluded that the nylon based denture base material was most easily wettable denture base material and Wet Mouth offered the greatest hysteresis value. 2. It was also concluded that the combination of nylon based denture base material and Wet Mouth offered the greatest retention. Keywords: Contact angle, denture base material, retention, saliva substitute, wettability Source of support: Nil Conflict of interest: None