Hemisection: an option to treat apically fractured and dislodged part of a mesial root of a molar

This is a case report of a lady who was worried about the presence of a small tooth like structure in the area adjacent to root treated left mandibular first molar. Intra-oral X-ray showed that it was an apically fractured part of the mesial root of the molar lodged in the buccal sulcus. The tooth was hemisected and mesial root was removed along with the dislodged part. A three unit bridge combining the hemisected root and adjacent second premolar was inserted which is successfully in service for more than a year

Effect of alkaline vs acid surface treatment on bond strength of adhesives used for amalgam repair

To assess the effect of alkaline versus acid surface treatment on bond strength of adhesives used for amalgam repair. Sixty cylindrical samples were prepared by condensing amalgam into plastic tubes 0/ 4mm diameter and 10mm length. Tubes were filled up to 5.0mm with admixed amalgam. They were allowed to set hard for three months. The samples were divided into Al, A2 andA3. Al and A2 had 25 samples each and A3 bad 10 samples. Flat exposed surfaces of the samples in Al were treated with 35% Phosphoric acid for 3 minutes. The samples in A2 were treated with 10% solution of Ca ['OH]2. A dentine adhesive containing 4-META, Amalgabond was applied on the treated surfaces. The adhesive-coated surfaces, with the help of a probe were pushed inside the tubes such that uncoated surfaces came in level with the margins of the tubes on the other end. Samples in A3 were not treated with acid or alkali and were kept as control group. Freshly mixed amalgam was packed against the coated surfaces to completely fill the transparent tubes. The samples were subjected to electromechanical testing machine at the crosshead speed of 10mm/minute to collect the data. Mean bond strength of the control samples was 3.0 MPa. It decreased with 35% phosphoric acid and increased with 10% Calcium Hydroxide in the range of 4.5 MPa. The results of the present study revealed that alkaline treatment brings more hardness to the sample surface, whereas acid softens the surface