The main problem with semiprecision attachment retained prosthesis is that they need frequent servicing in terms of replacing the female component. There is a need for a study to assess the life span and frequency of replacement of elastic components in the attachment systems.

The aim of the study was to test the retention strength and fatigue resistance of Rhein OT cap and Ceka sagix attachment systems fabricated on the models.

Rhein OT cap (micro) and Ceka sagix attachments were procured. Acrylic resin mandibular models fabricated with teeth embedded at overdenture positions. Bar framework with attachments were cast and cemented on the model. Denture fabricated on this model was subjected to universal testing machine (UTM Instron 5900 series) for retention and fatigue test. The retention strength was measured at various cycles namely 1,440, 2,880, 4,320 and 5,760 cycles to check for the loss of retention and development of fatigue on the basis of average number of removals and placements per day for 1,2,3 and 4 years, respectively. The values of both the attachment systems were recorded at the respective cycles and a graphical analysis was carried out representing the retention loss and development of fatigue.

One-way ANOVA was used as part of the statistical analysis to compare the retention strength and fatigue resistance of both the attachment systems used. The results obtained proved that the retention values of both the attachment systems on tooth supported overdentures had a significant variation as they were subjected to increased number of cycles.

Sagix and Rhein attachment systems showed adequate retention values up to the first 2 to 3 years (2,880- 4,320 cycles). Fatigue test simulating 4 years of denture insertion and removal did cause subsequent reduction in the retention values but no component fracture of attachment systems.

Guttal SS, Nadiger RK, Abhichandani S. Effect of Insertion and Removal of Tooth Supported Overdentures on Retention Strength and Fatigue Resistance of Two Commercially Available Attachment Systems. Int J Prosthodont Restor Dent 2012;2(2):47-51.

Electric fluctuations in the developing world are common and may affect dental composite curing. We determined the effect of variable voltage and increasing thickness of different shades of composite on its depth-of-cure.

ISO scrapping method was used on 14 commonly used shades of Esthet-X HD composites. Student's t-test and ANOVA were applied to compare the mean depth-of-cure and a linear regression model was developed using variables voltage (180 V and 220 V), material thickness (2, 4 and 6 mm) and shades (n = 14).

The mean curing depth of samples was significantly reduced at 180 volts compared to 220 volts (p-value <0.002). At thickness of 2 mm, all samples were fully cured but when it was raised to 4 mm, the depth-of-cure reduced to 1.86 mm ± 0.06; while at 6 mm thickness, it reached to 1.96 mm ± 0.06 (p-value < 0.001).

Around 82% variation in the depth-of-cure is explained by voltage, thickness and shade of composite material (p-value <0.001).

Electric fluctuations are prevalent in the developing world and thus poor voltage flow is responsible for dental composite's inadequate polymerization.

Khan FR, Hasan M, Azam SI. The Effect of Different Shades, Voltages and Increment Thickness on the Polymerization Depth of a Microhybrid Composite. Int J Prosthodont Restor Dent 2012;2(2):52-56.

Hassan U, Farooq I, Mahdi S, Ullah R, Rana H. Newer Glass Ionomer Cements having Strontium Ions and the Effect of their Release on Acidic Medium. Int J Prosthodont Restor Dent 2012;2(2):57-60.

Bharti R, Chandra A, Tikku AP, Arya D. Palatogingival Groove: A Cause for Periapical Infection. Int J Prosthodont Restor Dent 2012;2(2):61-65.

Tasaka A, Ueda T, Sakurai K. Infraocclusion Treated with Removable Prosthesis on Occlusal Surface of Severely Attritioned Teeth. Int J Prosthodont Restor Dent 2012;2(2):66-71.

Muley BY, Khalikar AN, Shaikh SR, Tagore MM, Patil PG, Wankhade SV. Full Mouth Rehabilitation of a Patient with Severely Worn Dentition and Reduced Occlusal Vertical Dimension: A Clinical Report. Int J Prosthodont Restor Dent 2012;2(2):72-76.

D'Souza R, Shetty O, Puppala P, Shetty N. A Better Bond: Luting Simplified. Int J Prosthodont Restor Dent 2012;2(2):77-81.