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Tooth Fragments (tooth + fragment)
Selected AbstractsTooth fragments lodged in the lower lip after traumatic dental injury: a case reportDENTAL TRAUMATOLOGY, Issue 4 2008Maria Cristina Munerato The efficient diagnosis and treatment of dental injury are important elements in clinical dentistry. This article describes a case study of trauma in central maxillary incisors with tooth fragments lodged in the lower lip. Radiographs of the soft structures proved themselves as an important tool in the detection and identification of occult tooth fragments, and play an important role in the establishment of the treatment to be adopted. Also, case follow-up is of fundamental significance in the preservation and maintenance of compromised structures. [source] Bonding of fractured permanent central incisor crown following radiographic localization of the tooth fragment in the lower lip: a case reportDENTAL TRAUMATOLOGY, Issue 5 2010Gabriela Ferrari Da Silva Schwengber The trauma also resulted in a cut on his mentum. Radiographic examination revealed the fractured tooth fragment embedded in the lower lip. The fractured tooth, with incomplete root formation, was treated endodontically and received a temporary restoration. After 15 days, the temporary restoration was removed and the fractured tooth fragment was etched with 37% phosphoric acid. A bonding system was then applied to the etched-fractured tooth surface without polymerization. The same bonding procedure was carried out on the tooth fragment. A layer of flowable resin composite was applied to the fragment, which was positioned on the remaining tooth. The resin composite was then polymerized, finished, and polished. [source] Multiple microscopy modalities applied to a sea urchin tooth fragmentJOURNAL OF SYNCHROTRON RADIATION, Issue 5 2003S. R. Stock Two synchrotron X-ray microscopy methods, phase-contrast microradiography (the propagation method) and absorption microCT (high-resolution computed tomography or microtomography), and laser-scanning confocal microscopy (visible wavelength) were used to study a fragment of the keel of a tooth of the sea urchin Lytechinus variegatus. Stripes observed in the phase-contrast images of the fragment were also seen in confocal micrographs. MicroCT showed that the stripes were due to two parallel planar arrays of low-absorption channels within the bulk of the keel. In the phase microradiographs, maximum contrast stripes appear when a channel image from one row coincides with a channel image from the second row; otherwise, contrast is minimal. Long channels do not appear to have been observed previously in keels of sea urchin teeth. [source] Tooth fragments lodged in the lower lip after traumatic dental injury: a case reportDENTAL TRAUMATOLOGY, Issue 4 2008Maria Cristina Munerato The efficient diagnosis and treatment of dental injury are important elements in clinical dentistry. This article describes a case study of trauma in central maxillary incisors with tooth fragments lodged in the lower lip. Radiographs of the soft structures proved themselves as an important tool in the detection and identification of occult tooth fragments, and play an important role in the establishment of the treatment to be adopted. Also, case follow-up is of fundamental significance in the preservation and maintenance of compromised structures. [source] ESR isochron dating analyses at Bau de l'Aubesier, Provence, France: Clues to U uptake in fossil teethGEOARCHAEOLOGY: AN INTERNATIONAL JOURNAL, Issue 7 2001Bonnie A.B. Blackwell At Bau de l'Aubesier, Provence, Mousterian artifacts and human teeth occur in inhomogeneous ("lumpy") sedimentary deposits that include bone and tooth fragments and extensive burnt horizons. Electron spin resonance (ESR) isochron analyses of mammal teeth, which use multiple subsamples with different U concentrations, can measure the external dose rate experienced by the tooth regardless of reworking and sedimentary dose rate changes. Isochron analyses do depend on the U uptake model assumed, but can also identify teeth that have experienced secondary U uptake or leaching. Using 11 teeth from six archaeological layers, the isochrons demonstrate that at least three teeth have experienced secondary uptake. For eight teeth, the U uptake has apparently not followed strictly early (EU), linear (LU), or recent uptake (RU), but more closely approximates LU-RU. Comparing volumetrically averaged sedimentary geochemistry with thermoluminescent dosimetry suggests that fossil tissues in the sediment have also experienced LU-RU uptake. LU-RU uptake can explain standard ESR ages that underestimate the true fossil age. © 2001 John Wiley & Sons, Inc. [source] Shear bond strengths of tooth fragments reattached or restoredJOURNAL OF ORAL REHABILITATION, Issue 1 2003A. Sengun summary, This study investigated the shear bond strengths of sectioned human mandibular incisor edge fragments reattached using luting cements, bonding agents or restored with composite resins. Seventy teeth were randomly distributed among six experimental groups and a control group. Leaving half of the anatomic crowns exposed, the teeth were embedded in self-cure acrylic resins with the exposed part then sectioned. The fragments in groups 1,4 were bonded to their respective teeth using Clearfil Liner Bond 2V, Scotch Bond Multi Purpose Plus, Panavia-F and 3M Opal Luting cement. The 5th and 6th groups were restored with composite resins (Silux 3M and Clearfil AP-X) using their bonding agents (Single Bond and Clearfil SE Bond). The results indicated that reattachment of fractured incisal fragments by using new generation bonding agents was effective against shear stresses, comparable with the intact teeth. Instead of restoration with composite resins therefore reattachment of a fractured fragment might be more preferable in cases of dental trauma. [source] The utility of tooth enamel microstructure in identifying isolated dinosaur teethLETHAIA, Issue 3 2010SUNNY H. HWANG Hwang, S.H. 2010: The utility of tooth enamel microstructure in identifying isolated dinosaur teeth. Lethaia, Vol. 43, pp. 307,322. The identification of isolated dinosaur teeth is frequently an uncertain process because dinosaur teeth are simple in morphology compared to those of mammals. Teeth among genera and species within major dinosaur clades are often identical, and damage or abrasion of teeth further complicates their identification. To aid diagnosis of isolated teeth, systematic descriptions of dinosaur teeth have been compiled, and quantitative morphometric identification methods have also been developed. However, these aids work best with relatively intact teeth. Enamel microstructure, in contrast, can be used to identify the minutest of tooth fragments as long as the entire enamel thickness, often <100 ,m, is preserved. In addition, enamel microstructure can be used to differentiate isolated teeth that are similar in morphology but have different enamel, such as ankylosaur and posterior pachycephalosaurid or basal theropod and tyrannosaurid teeth. To evaluate the efficacy of enamel microstructure as an identification tool, nine isolated dinosaur teeth, specimens originally identified as ,Carnosauria' indet., Theropoda indet., Nanotyrannus sp., Tyrannosauridae indet., Troodontidae indet., Pachycephalosauridae indet., Hadrosaurinae indet. and cf. Thescelosaurus sp., were sectioned and their enamel examined using scanning electron microscopy. Upon inspection of their enamel microstructure, three of the specimens could be identified to genus, and the taxonomic identity of all the specimens were better understood. While enamel microstructure may not always constrain the identity of an indeterminate tooth to the generic or species level, it usually allows for a more accurate identification. ,Dinosaur teeth, enamel microstructure, taxonomic identification, microfossils. [source] | |||||||||||||