FT‐Raman spectroscopy of calcium hydroxide medicament in root canals

Abstract

Calcium hydroxide medicament in root canals became transformed into calcium carbonate in the apical region within 2 days. Although the transformation continued with time, approximately 90% of the calcium hydroxide remained unchanged after 6 weeks.

The use of calcium hydroxide, antibiotics and biocides as antimicrobial medicaments in endodontics

“…This material has a very low solubility, creates only a mildly alkaline pH of 8.0, and as a result has neither biological nor antibacterial properties. 52 Kwon et al 52 showed that 10 per cent of the calcium hydroxide was converted to calcium carbonate in the apical region within two days and the remainder was unchanged after six weeks. Little calcium carbonate was detected in samples from the middle portion of the root canal even after six weeks.…”

Raman scattering or fluorescence emission? Raman spectroscopy study on lime-based building and conservation materials

“…803 cm -1 (1163 nm) and 726 cm -1 (1153 nm). As mentioned above, the same bands were also recognized in the corresponding spectra of some synthetic belites (C 2 S), however, two different specimens of C 2 S have shown different positions in spectra [19]. Although our studies of that group of materials are not focused on providing an explanation of the origin of the fluorescence emission excited by NIR laser radiation, they add nevertheless some arguments for further discussion on that issue.…”

“…No other bands have been found by them, when Ca(OH) 2 is excited with the laser line of 1064 nm. Spectrum of calcium hydroxide medicament reported by Kwon et al [19], apart from two strong bands at 796 and 721 cm -1 , showed a broad band of low intensity centred at 930 cm -1 and a very weak feature at 363 cm -1 .…”

“…Raman spectra acquired with a laser excitation at 1064 nm of calcium hydroxide and related materials, like lime binders, have been rarely reported and its interpretation is often inconclusive [3,7,19,20,21]. Aminzadeh has shown a narrow region of Ca(OH) 2 spectrum only presenting a doublet of strong bands at 920 and 776 cm -1 which has been assigned to fluorescence emission since the bands were absent in Raman spectrum obtained with the use of a 633 nm laser excitation [3].…”

Análise da Formação de Carbonato de Cálcio pela Reação do Hidróxido de Cálcio com Diferentes Veículos Anestésicos

“…O hidróxido de cálcio em contato com o CO 2 (dióxido de carbono), submete-se também à mudança química, sendo transformado no carbonato de cálcio 14 . Alguns pesquisadores analisaram a perda na qualidade do produto em conseqüência de sua carbonação devido ao gás do dióxido de carbono na atmosfera 11,12 .…”