This study indicates that most of the general dental practitioners' do not comply with quality standards guidelines such as use of rubber dam as isolation. So dentist should update their knowledge and practices with current techniques and materials through CDE programs.
<h1>In recent years, the popularity of tooth colored restorative material has led to a rapid increase in the use of resins. This critical review paper is meant to be useful contribution to the recognition & understanding of problems related to the failures of composite restoration. This review categorizes the challenges as those related to the restorative materials, the dentist and the patients. In spite of the major improvements in both physical and mechanical characteristics following factors are still of major concern, such as improper case selection, isolation, wear resistance, cavity preparation, placement of composites, curing, finishing & polishing. Major problems associated with composites failures are polymerization shrinkage & contraction stress related to polymerization shrinkage, water sorption, solubility, discoloration of restoration (staining), elution of material from restoration, marginal failures, secondary caries, and fracture of the restoration, post-operative sensitivity, and micro-leakage.</h1>
Aim:The aim of this in vitro study was to evaluate if there is any significant difference in apical leakage when gutta-percha is removed immediately after obturation for postspace preparation or after a week. Materials and methods:Two commonly used sealers AH26 and tubliseal were used in four groups each consisting of 20 teeth each. The tooth was sectioned at the amelocemental junction to leave a root portion of 12 to 14 mm. Canals were checked for patency and prepared to No-55 K file size. Two people, using a stereomicroscope, independently evaluated each tooth-half for the extent of apical leakage. Results:The leakage results were analyzed using a one-way ANOVA according to present study, immediate postpreparation is preferable than delayed postpreparation. The relationship of in vitro leakage measurements to the in vivo situation has not been established.Clinical implication: Hence, immediate postpreparation is preferable than delayed postpreparation.
Background: Restored teeth are generally weaker than sound teeth due to loss of tooth structure caused by caries and restorative procedures. The loss of both tooth structures as a result treatment will increase the likelihood of fractures during functional loading. Objective: To evaluate the fracture resistance of premolars with class II disto occlusal preparations restored with light cured composite with light cured composites layered incrementally and silver amalgam in comparison with intact and unrestored teeth. Material and methods: 50 freshly extracted premolars were randomly divided into 5 groups of 10 teeth each. All the 50 specimens were then subjected to a compressive load in a Universal Testing Machine (Hounsfield). The loads required to fracture the teeth were recorded and the data, obtained were subjected to statistical analysis and the following results were arrived. Result: Teeth restored with light cured composite incrementally placed in oblique layers produced a higher fracture resistance than any other group and showed the closest value to the intact teeth. This was followed in descending order by light, cured composite placed in horizontal increments and silver amalgam. Conclusion: Result concluded that teeth restored with light cured composite incrementally placed in oblique layers produced a higher fracture resistance than any other group and showed the closest value to the intact teeth.
The purpose of this study was to see how a short-term application of calcium hydroxide affected the dentine strength of adult human permanent teeth. Materials and methods: We selected 15 disease-free permanent mandibular premolars extracted from humans. The root canals were prepared using rotary equipment and divided into three groups at random. In one group, the root canals were filled with a calcium hydroxide paste (RC Cal) and in another group the root canals were filled with a calcium hydroxide paste (NEO Cal). Canals of teeth in the control group were left empty. All teeth were stored in normal saline for 14 days and then coronal third root dentin cylinders were created by removing the crown and apical portions of the teeth. The compressive forces required to shatter the dentin cylinders were measured using an Instron machine (UNIVERSAL TESTING MASCHINE), and the data was analysed using the Anova test. Results: The calcium hydroxide-filled teeth had a considerably lower mean compressive force than the control teeth (P < 0.005). Conclusion: Teeth that had been exposed to calcium hydroxide for 14 days needed less compressive force to shatter root dentin cylinders. Further research is needed to see if impact testing will provide similar results.
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