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Development of ceria with high fluoride loading capacity at pH 7.0 within 2 h at 1 g L−1 adsorbent dose.

Provisionalization Autopolymerizing resins Abutment preparationsRemaining dentine thickness a b s t r a c t Background: Resin materials used in the fabrication of direct provisional restoration exhibit an exothermic reaction and the extent of damage may also depend on the remaining dentine thickness. An ex-vivo study was envisaged to compare the time related temperature changes in the pulp chamber during the fabrication of fixed partial denture provisional restorations using direct technique. The effect of differently prepared teeth (with varying remaining dentine thickness) on the above mentioned temperature changes were also evaluated.Methods: Thermal changes were calculated in pulp chamber of three differently prepared tooth having different amount of remaining dentinal thickness (45 samples) and control with no tooth media (15 samples), using three different types of autopolymerizing provisional restorative materials using Cr/Al thermocouple connected to digital thermometer.Results: The data for the mean peak temperature rise was subjected to one way ANOVA analysis for relative comparison among subgroups within each main group and across the main groups. The results showed a statistically significant difference across both the subgroups and the main groups ( p < 0.001). Then Turkey HSD test was applied to determine the significance of statistical difference between the means, within the groups. The differences in temperature rise were statistically significant for the three resins ( p < 0.001).Conclusion: Polymethylmethacrylate (DPI) showed the highest temperature rise value followed by polyethyl methacrylate (Tempron) and Bis-acrylate composite (CoolTemp). The maximum temperature rise was found on molar full veneer preparation followed by molar three quarter preparation and premolar three quarter preparation. Data and results from current study may assist clinicians to select an autopolymerizing provisional restorative resin when employing direct technique of fabricating provisional restorations for a specific tooth preparation which would cause minimal thermal trauma to pulpal tissue. ª

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Body abnormalities or defects that compromise form, function and esthetics are sufficient to render an individual incapable of leading a normal life. Maxillofacial disfigurement can be the result of a congenital anomaly, trauma or tumour surgery. Multiple times due to size, location of the defect or because of patient's medical condition surgical reconstruction may not be possible so prosthetic rehabilitation is indicated in these cases. But the success of prosthetic rehabilitation is largely determined by the physical and mechanical properties of the material used. Materials commonly used these days for fabrication of facial prostheses are acrylic resins, acrylic copolymers, vinyl polymers, polyurethane elastomers and silicone elastomers. There has always been a quest for a maxillofacial prosthetic material that closely matches the defect tissues in appearance and properties. This article focuses on historical background, changing trends and future aspects of various materials used in rehabilitation of maxillofacial defects with their limitations and modifications.

An avulsed permanent tooth is one of the few real time dental emergencies, wherein a potential unscheduled diagnostic and treatment decision outside the regular practice experience of the dentist awaits him. Prognosis is dependent on the decisions taken in the "Golden Hour" aftermath the accident. Reimplantation is the treatment of choice as there are chances of successfully saving a tooth. The condition is compounded by the lack of public awareness and the presence of a proper avulsion management protocol that has been tested by prospective longitudinal studies. This article discusses an unusual case of total replacement resorption along with a comprehensive review of the etiology, pathology, clinical features, and the management of the condition.