salehe sekandari

Amelogenesis Imperfecta is a hereditary complication that affects the quality and quantity of tooth enamel. This disease usually affects both deciduous and permanent dentition and causes various abnormalities such as unaesthetic appearance, dental sensitivity, and severe attrition. The incidence of this condition is estimated at 1 in 14,000 people. At the moment, there are no specific treatment recommendations for patients suffering from AI. when treating these patients, a comprehensive treatment with interdisciplinary approach should be considered.

The patient was a 14-year-old girl who had referred to Shahab Dental Clinic in Mashhad with a complaint about the improper shape and color of her teeth. The patient had no history of any specific disease and no family history of this disease was reported in his family. After clinical and radiographic examination the patient was diagnosed with AI (hypoplastic type).

Related to Patient’s functional and emotional impression of AI, treatment of these patients has specific importance.

Different surface treatments were preposed to prepare the tooth structure for resin composite bonding. One of the most common preparation is using of phosphoric acid etching. This study conducted to determine the etching effectiveness of a new formulated acid etchant (Exir) and compared it with two commercial products. To determine the physical properties, the viscosity and shelf life were evaluated by a viscometer and a centrifuge over the time, respectively. SEM micrographs were uesd to show the geometry of bovine enamel and dentin surfaces which were treated by three etchants. The µSBS of composite to treated dental tissues was also investigated. Data were analyzed by ANOVA and Tukey test (α=0.05). Exir etchant showed the lower viscosity compared with two other gels and two-phase separation did not significantly increase during suggested period. The SEM images of enamel samples treated with Exir etchant showed regular etching patterns and less remnant in comparison with other groups. The SEM mages of dentin samples treated with Exir etchant, unlike others, showed wide open dentin tubules with clear exposed collagen fibers. Enamel and dentin µSBS were 30.08±6.79 and 7.29±1.27 for Exir etchant, 23.31±6.64 and 8.49±3.61 for Morva Etch and 23.22±7.05 and 6.16±1.68 for Ultra-Etch, respectivley. The µSBS values ​​for enamel was significantly higher in Exir treated group (P=0.017), while there was no significant difference in dentin µSBS values among three tested etchants (P=0.07). The results of this study showed Exir etchant can provide acceptable results used on dentin and enamel substrates.

The numerous difficulties found during root canal treatments are due to anatomical variations in the radicular morphology. Maxillary premolars have highly varied root canal systems and shapes. This case report addresses two endodontic treatment cases of the maxillary first and second premolars with three canals and a summary of their anatomical forms. The article describes the diagnosis and clinical management of these teeth.

The present study aimed to evaluate the effect of home bleaching on the color enhancement of white spot lesions (WSLs) after orthodontic treatment.

This interventional semi-experimental study was conducted on 10 patients with inactive WSLs after orthodontic treatment who referred to Mashhad Dental School between May 2016 and May 2017. The tooth color was measured by a spectrophotometer at baseline and the color determination was performed in the area of ​​healthy enamel (F1) and the adjacent demineralized enamel (F2). Afterward, the teeth underwent home bleaching for 2 weeks. The color measurements were performed one day and one week after the treatment under the same condition. The color change of the healthy and demineralized groups at each time point was compared to each other; moreover, the color differences between healthy and demineralized areas were compared at the three different time points. The collected data were analyzed using an independent samples t-test and repeated measures ANOVA. Furthermore, a p-value of less than 0.05 was considered statistically significant.

The degree of color change before the treatment and one day after the treatment was greater in healthy enamel (9.28±3.29), compared to demineralized enamel (6.98±2.92). However, the results of the independent samples t-test revealed no significant difference between healthy and demineralized enamel regarding the color change at various time points (p < /em>>0.05). There was no significant difference between the color change of healthy (F1) and demineralized (F2) enamels at the three evaluated time points (p < /em>>0.05).

Based on the results, under the conditions of this study, home bleaching was not an effective method for the color improvement of enamel WSLs after orthodontic treatment.

For a successful root canal treatment, it is critical for a clinician to have complete knowledge of the root canal morphology. There are numerous cases in literature concerning the unusual anatomy of mandibular first molars. This report presents a case of a mandibular first molar with three distal canals. An overview of the types and numbers of the common anatomic forms of this tooth also is presented, as is a summary of published anomalies.Key words: Distal Root; Mandibular First Molar; Root Canal Anatomy