Objective:Analysis of shaping ability of four different rotary endodontic instruments using spiral computed tomography (CT).Materials and Methods:Eighty freshly extracted human mandibular first molars were used in the present study. Samples were randomly divided into four experimental groups with twenty samples in each group. Images of mesiobuccal canal of each sample were obtained pre- and post-operatively using spiral CT. All samples were prepared using their respective endodontic file systems (group I - ProTaper, group II - K3, group III - RaCe, and group IV - Mtwo). Image analyses were done using image analysis software for evaluation of canal transportation and centering ability. Data was then statistically analyzed using analysis of variance.Results:There was no statistically significance in transportation in their intergroup difference at any of the three locations (coronal, middle, and apical third). In centering ability there was no statistically significance in the coronal and middle third of the intergroup. However, there was a statistically significance of (P = 0.044) at the apical third between all the groups.Conclusion:Canals prepared with ProTaper had more canal transportation at all the three levels of root canal (coronal, middle, and apical third). Canals prepared with Mtwo were well centered at coronal and middle third whereas with RaCe canals were centered only at the apical third. All instruments showed some degree of canal aberrations in terms of shaping ability.

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The visible color alterations in esthetic materials can also be ascribed to the proprietary differences in chemistry that may affect the polymerization, water sorption, and consequently the color stability of the material. In addition, the obvious effect of colorants in beverages and foods leads to extrinsic discoloration of composites. Thus, for suitable performance, longevity and good clinical success of esthetic restorations, the material of choice should present adequate inherent characteristics. The discoloration of tooth-colored, resin-based materials may be caused by intrinsic or extrinsic factors. Visual or instrumental techniques can be used to evaluate discoloration. The use of instrumental methods like spectrophotometers and colorimeters to quantify tooth color could potentially eliminate the subjective aspects of color assessment. Hence based on above findings the present study was planned for evaluation of spectrophotometer analysis of bulk-fill composites on various daily used beverages. The present study was planned in Department of Conservative Dentistry and Endodontics, Buddha Institute of Dental Sciences and Hospital, Patna, Bihar. The color of composite resins can be determined by varying methods, including visual assessment and instrumental measurement by a spectrophotometer. According to the Spectrophotometer results of this study, material tested became changes in color after immersion in the beverages. The data generated from the present study concludes that all the beverages used in this study changes in color in the material tested. Coca-Cola causes more color changes than other beverages in the material tested. The total changes of color after 1, and 7 days of composite immersion in coca cola were higher than the clinically acceptable threshold, and they are comparable to the color changes observed with coffee, tea, orange juice and beer, which are known as strong staining agents. Keywords: Spectrophotometer Analysis, Bulk-Fill Composites, Beverages, esthetic materials, color change, etc.

Coronal fractures of the anterior teeth are a common form of dental trauma and its sequelae may impair the establishment and accomplishment of an adequate treatment plan. Among the various treatment options, reattachment of a crown fragment obtained from a previously extracted tooth is a conservative treatment that should be considered for crown fractures of anterior teeth. This article reports reattachment of an allogenous tooth fragment in a fractured maxillary lateral incisor in a 38-year-old patient. It is suggested that allogenous reattachment in a fractured anterior tooth serves to be a better alternative and should be further researched. Aesthetic and functional rehabilitation of a fractured complicated anterior crown using allogenous tooth fragment is a better alternative to other more conventional treatment options.

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