Split Teeth Research Articles

Laser dentistry: root canal diagnostic technique based on ultraviolet-induced fluorescence spectroscopy.

A diagnostic technique to detect residual tissues at different levels of the root canal during an endodontic treatment is presented. The diagnostic system is based on ultraviolet-induced fluorescence spectroscopy and uses suitable optical fibers for local delivery of excitation light and to collect back fluorescence spectra. Spectra of root canal tissues have been obtained from split teeth by labeling with a fluorescent solution. Residual tissue can be discriminated in respect to healthy dentin because of their different spectral responses: the spectral shape of the first response shows a clear peak at 530 nm because of a selective absorption of the fluorescent dye, whereas for the second response, the spectral curve monotonically increases toward ultraviolet wave-lengths with no particular structure. This technique has been tested on unsplit teeth simulating operative conditions. A compact spectroscopic system has been devised that can be easily integrated in an excimer laser system to perform residual tissue detection during laser cleaning of the canals.

Determination of lead in teeth by atomic absorption spectrometry with electrothermal atomisation.

After dissolution of whole teeth in nitric acid, the digests are evaporated to dryness and re-dissolved in 5%V/V nitric acid. Lead is determined by atomic absorption spectrometry with electrothermal atomisation directly against standards in 5%V/V nitric acid. Interference from the tooth matrix is shown to be minimal. Accuracy is demonstrated by satisfactory recovery of added lead, by analysis of the IAEA reference material H-5 animal bone, and by inter-laboratory comparison. Determination of lead in the two halves of 61 split teeth showed a high correlation (r= 0.987) with a mean difference of 0.8 µg g–1.

Swallowing in upright, inclined, and supine positions: action of the temporal, lateral pterygoid, and digastric muscles.

abstract – Dental pulps from 45 caries‐free primary or permanent teeth and from 24 carious primary teeth were investigated for presence of mast cells (MC). All the pulps were removed from split teeth and fixed in Newcomer's fluid or lead acetate‐formalin. Serial sections stained with hematoxylin‐eosin, astra blue (pH 0.2–0.3) + nuclear fast red, and toluidine blue (pH 1.0) demonstrated that pulps without inflammatory cells or with a few small lymphocytes were devoid of typical MC, even in the strongly metachromatic regions. However, MC were noted in all inflamed pulps; the number, distribution, and appearance of the MC depending upon the severity and type of the inflammatory reaction.

A technique to split teeth

A technique to split teeth