Intracanal Irrigating Solutions Prior to Calcium Hydroxide Medication and Its Effects on Root Dentin Strength

Abstract

The aim of this study was to assess the effects of intracanal irrigation with sodium hypochlorite (NaOCl) and ethylenediaminetetracetic acid (EDTA) prior to calcium hydroxide medication on the compressive strength of root dentin. Forty-eight roots with single and straight canals were instrumented with a crown-down technique using Flexofile files and Gates Glidden burs, under 0.9% sodium chloride (NaCl) irrigation. Root canals were randomly separated into 4 groups (n=12), according to the irrigating solution: Control Group, 0.9% NaCl; Group NaOCl , 1% NaOCl; Group EDTA , 17% EDTA; and Group EDTA+NaOCl , 17% EDTA and 1% NaOCl. Solutions remained for 40 min, renewed every 10 min, except for Group EDTA+NaOCl , where the solutions were alternated every 10 min. Canals were dried and filled with calcium hydroxide paste, and radiographed. Each canal was sealed and stored at 37 °C for 30 days. After this period, the roots were cut 1 mm below the cementoenamel junction and 6 mm apically from this point in order to obtain 6 mm-long cylinders. The compressive test was conducted with a crosshead speed of 1 mm/min. The means (±SD) (MPa) of compressive strength were: Control Group, 151.23±94.36; Group NaOCl , 167.50±57.25; Group EDTA , 108.79±99.88; Group EDTA+NaOCl , 60.12±92.10. Significant statistical differences among groups were found (ANOVA and Tukey, α=5%, p=0.02). Control Group and Group NaOCl showed higher means of compressive strength than Group EDTA+NaOCl . Intracanal irrigation with 17% EDTA and 1% NaOCl produced a significant reduction of dentin compressive strength 30 days after medication with calcium hydroxide.

Effect of Artificial Saliva on the Corrosion Behavior of Dental Alloys: A review

“…It is further enhanced by the fluoride ions in toothpaste and in the products used as mouthwash as it plays the role of an essential factor accelerating corrosion [5][6][7][8][9]. Corrosion resistance of biomaterials made up of various metals and alloys has been investigated in artificial saliva (AS); various metals and alloys such as Ti-Co alloy [10], Ti30Ta alloy [11], Ti metal, Ti6-Al-7Nb, and Ti-6Al-4V alloy [1,12], Ti-6Al-7Nb alloy [13], Co-Cr alloy [14][15][16][17][18], CP-Ti and Ni-Cr-Ti alloy [19], Co-Cr-Mo alloy [20,21], Ni-Cr alloy [18,22,23], Ti-Cu [24], Ti-20Zr alloy [25], Ti12Mo and Ti60Ta [26], Ni-Ti shape memory alloy and stainless steel wire [27], Ti-Mo [28], mild steel coated with zinc [29], NaOCl [30], and 60NiTi [31]. Corrosion resistance of various metals has been investigated in AS.The composition of artificial saliva is given in Table 1.…”

The Potential of Bilimbi Leaves (Averrhoa bilimbi Linn.) Extract as Irrigation Solution to Remove Smear Layer in Dental Root Canal: An Invitro Study

“…17% EDTA has chelation properties to clean the smear layer 4. However, root canal irrigation materials derived from chemical substances have a high level of toxicity and can damage cells and tissues when used, the effects of which vary from pain, irritation, oedema to bleeding in the root canal of teeth 5. Alternative materials are needed for root canal irrigation of teeth derived from medicinal plants.…”

Análise da resistência de união (RU) do cimento Ah Plus utilizado na obturação de dentes submetidos a diferentes protocolos de irrigação

“…Para complementação da limpeza dos canais radiculares, agentes quelantes, como o ácido etilenodiaminotetracético (EDTA), são comumente utilizados como solução auxiliar do preparo biomecânico durante a troca de instrumentos, ou após finalizada a instrumentação em uma ação chamada inundação final com o propósito de remoção da parte inorgânica da camada de smear na parede dentinária (MESHRAM et al, 2016;PIPERIDOU et al, 2018), a fim de aumentar a permeabilidade canalicular (HÜLSMANN et al, 2003;HILLESHEIM et al, 2017) O sucesso da terapêutica depende da finalização proporcionada pelo selamento hermético do sistema de canais radiculares. Essa complementação chamada obturação, é alcançada pela combinação entre gutapercha e cimento obturador (ORSTAVIK, 2005).…”