Dentin Morphology of Root Canal Surface: A Quantitative Evaluation Based on a Scanning Electronic Microscopy Study

Abstract

Dentin is a vital, hydrated composite tissue with structural components and properties that vary in the different topographic portions of the teeth. These variations have a significant implication for biomechanical teeth properties and for the adhesive systems utilized in conservative dentistry. The aim of this study is to analyse the root canal dentin going from coronal to apical zone to find the ratio between the intertubular dentin area and the surface occupied by dentin tubules varies. Observations were conducted on 30 healthy premolar teeth extracted for orthodontic reasons in patients aged between 10 and 14. A SEM analysis of the data obtained in different canal portions showed that, in the coronal zone, dentinal tubules had a greater diameter (4.32 μm) than the middle zone (3.74 μm) and the apical zone (1.73 μm). The average number of dentinal tubules (in an area of 1 mm2) was similar in coronal zone (46,798 ± 10,644) and apical zone (45,192 ± 10,888), while in the middle zone they were lower in number (30,940 ± 7,651). However, intertubular dentin area was bigger going from apical to coronal portion. The differences between the analysed areas must be considered for the choice of the adhesive system.

The effect of intracanal medicaments used in Endodontics on the dislocation resistance of two calcium silicate-based filling materials

“…The conflicting results could be due to the different factors included in the study designs; slices were prepared from the apical third of the root in the Kadic et al [41] study instead of the middle root slices used in the present study. Variations in both the number and size of dentinal tubules in the different root canal portions have been reported in the literature [42]. Furthermore, their sections were prepared after material placement inside the root canal that might affect the material adaptation.…”

In Vitro Evaluation of Bond Strength to Primary Molar Dentine and Microleakage Properties of Low Polymerization Shrinkage Silorane Based Composite Resin

“…6, No.3, 2020 permanent teeth. Also, mineral quantities and distributions vary compared to permanent teeth [22][23][24] . In the acid roughening of etch & rinse adhesives, deeper demineralization is encountered in the intertubular dentine, tubular lumen width increases, and the amount of intertubular dentin to be utilized for adhesion is reduced.…”

Evaluation and Comparison of the Marginal Adaptation of an Epoxy, Calcium Hydroxide-based, and Bioceramic-based Root Canal Sealer to Root Dentin by SEM Analysis: An In Vitro Study

“…The flow of sealer is a major factor that aids in improving the adhesion and adaptation to the dentin which indirectly improves In addition the surface activity of the sealers, contact angle formed between the sealer and the dentin, the obturation technique employed for root filling, and the sectioning method involved in the sample preparation play a key role in the sealer penetration and the gap formation. 12 The diameter and the density of the dentinal tubules are more at the coronal and the middle third of the root canal system whereas minimal at the apical third, this factor plays a major role in sealer penetration. 13 According to Boyde, a smear layer is an organic matter trapped within trans located inorganic dentine and is formed during instrumentation which is composed of organic and inorganic substances that include fragments of odontoblastic processes, microorganisms, and necrotic materials.…”