A photochemical method for in vitro evaluation of fluid flow in human dentine

Boreak, Nezar; Ishihata, Hiroshi; Shimauchi, Hidetoshi

doi:10.1016/j.archoralbio.2014.09.010

Cited by 2 publications

(1 citation statement)

References 21 publications

(19 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides, none of the remaining dentine thicknesses measured in both canals at all levels was less than 0.3 mm. This latter aspect is important considering that an extremely thin remaining root canal walls after preparation could be permeable to bacteria and their by-products (Boreak et al, 2015) and compromise the mechanical resistance of teeth (Lim & Stock, 1987).…”

Section: Discussionmentioning

confidence: 99%

Influence of access cavity preparation on the dentine thickness of mesial canals of mandibular molars prepared with reciprocating instruments

Silva¹,

Lima²,

Barbosa³

et al. 2021

Int Endodontic J

View full text Add to dashboard Cite

Aim: To evaluate the influence of traditional and conservative access cavity preparations on the remaining dentine thickness in the coronal third of mesial canals of extracted mandibular molars prepared with reciprocating instruments using microcomputed tomography as the analytical tool.Methodology: Seventy extracted mandibular molars were scanned at a pixel size of 19 μm. From this initial sample, 20 teeth were selected, pair-matched and distributed into two groups (n = 10) according to the access cavity preparation: traditional (TradAC) or conservative (ConsAC). The root canals were sequentially enlarged with Reciproc Blue R25 (size 25, 0.08v taper) and R40 (size 40, 0.06v taper) instruments. A new scan was performed and the postoperative stacks were coregistered with their respective preoperative datasets. A colour-coded cross sections of the roots were created and used to identify and measure the smallest dentine thickness related to both MB and ML canals at 1.0-mm intervals from the furcation level of up to 5 mm in the apical direction, in both mesial and distal aspects of the roots, before and after preparation.The statistical analyses were performed with paired-samples t-test, independentsamples Student T-test and Chi-Square test with a significance level of 5%. Results: At all levels of both groups, dentine thickness before preparation was greater than after preparation (p < .05). No difference in the percentage of dentine reduction was observed between TradAC and ConsAC groups (p > .05), but a significantly greater reduction was observed to the distal aspect of the roots (p < .05). After root canal preparation, dentine thinner than 0.5 mm was observed mostly along the distal aspect of the root (10% to 15%) of the MB and ML canals, with no influence of the access cavity type on its incidence to either mesial (X 2 = 1.66; p = .2) or distal (X 2 = 0.40; p = .5) directions. In the TradAC group, dentine thickness in most slices was greater than 1.0 mm after preparation (n = 124) whilst, in the ConsAC, it ranged from 0.5 to 1.0 mm (n = 136). Conclusion:Traditional or conservative access cavity preparation in extracted mandibular molars did not influence the remaining dentine thickness in the coronal third of mesial canals enlarged with thermomechanically treated nickel-titanium reciprocating instruments.

show abstract

Section: Discussionmentioning

confidence: 99%

Influence of access cavity preparation on the dentine thickness of mesial canals of mandibular molars prepared with reciprocating instruments

Silva¹,

Lima²,

Barbosa³

et al. 2021

Int Endodontic J

View full text Add to dashboard Cite

show abstract

Thermal analysis of the dentine tubule under hot and cold stimuli using fluid–structure interaction simulation

Gholampour

Jalali

2018

Biomech Model Mechanobiol

View full text Add to dashboard Cite

The objective of this study is to compare the thermal stress changes in the tooth microstructures and the hydrodynamic changes of the dental fluid under hot and cold stimuli. The dimension of the microstructures of eleven cats' teeth was measured by scanning electron microscopy, and the changes in thermal stress during cold and hot stimulation were calculated by 3D fluid-structure interaction modeling. Evaluation of results, following data validation, indicated that the maximum velocities in cold and hot stimuli were - 410.2 ± 17.6 and + 205.1 ± 8.7 µm/s, respectively. The corresponding data for maximum thermal stress were - 20.27 ± 0.79 and + 10.13 ± 0.24 cmHg, respectively. The thermal stress caused by cold stimulus could influence almost 2.9 times faster than that caused by hot stimulus, and the durability of the thermal stress caused by hot stimulus was 71% greater than that by cold stimulus under similar conditions. The maximum stress was on the tip of the odontoblast, while the stress in lateral walls of the odontoblast and terminal fibril was very weak. There is hence a higher possibility of pain transmission with activation of stress-sensitive ion channels at the tip of the odontoblast. The maximum thermal stress resulted from the cold stimulus is double that produced by the hot stimulus. There is a higher possibility of pain transmission in the lateral walls of the odontoblast and terminal fibril by releasing mediators during the cold stimulation than the hot stimulation. These two reasons can be associated with a greater pain sensation due to intake of cold liquids.

show abstract

A photochemical method for in vitro evaluation of fluid flow in human dentine

Cited by 2 publications

References 21 publications

Influence of access cavity preparation on the dentine thickness of mesial canals of mandibular molars prepared with reciprocating instruments

Influence of access cavity preparation on the dentine thickness of mesial canals of mandibular molars prepared with reciprocating instruments

Thermal analysis of the dentine tubule under hot and cold stimuli using fluid–structure interaction simulation

Contact Info

Product

Resources

About