Morphology and Microhardness of Dentin at the Furcation Area of Mandibular Molars

Filho, Antônio Miranda da Cruz; Flamini, L.; Pécora, Jesus Djalma

doi:10.1016/j.joen.2013.10.004

Cited by 3 publications

(6 citation statements)

References 16 publications

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“…This dentin characteristic was observed, indistinctively, in the three regions. Similar findings were described by Cruz-Filho et al (4) in relation to the dentin hardness of the mesial, middle and distal regions of the furcation in mandibular molars.…”

Section: Discussionsupporting

confidence: 90%

“…Similar findings of the dentin tissue characteristics observed in this experiment were verified in two previous studies. The first study (4) reported that the dentin of the furcation of mandibular molars is quite mineralized, tending toward a greater calcification as it approaches the inner layer, with the latter layer being harder than the outer layer. The second study (5) found that after instrumentation of the mandibular molars, by different techniques, there was no penetration of copper ions through the dentinal tubules along the furcation.…”

Section: Discussionmentioning

confidence: 99%

“…Furcation is considered as the area or region located between two or more roots, anatomically and usually divided at its base (3). Restricted information about the dental furcation region reveals that, in mandibular molars, the microhardness of this area is uniform across its mesial, central and distal axes (4). As also reported that the dentinal tubules have a centripetal trajectory of the pulp chamber floor towards the bifurcation of the roots (4).…”

Section: Introductionmentioning

confidence: 92%

“…The delimitation of the furcation area was based on the methodology used by Pécora et al (4). Initially, it determined the point on the outer surface of the most concave part of the furcation (C).…”

Section: Analysis Of Dentin Microhardnessmentioning

confidence: 99%

“…Restricted information about the dental furcation region reveals that, in mandibular molars, the microhardness of this area is uniform across its mesial, central and distal axes (4). As also reported that the dentinal tubules have a centripetal trajectory of the pulp chamber floor towards the bifurcation of the roots (4). A previous study showed that the furcation of mandibular molars is constituted, in a large part, by amorphous and less tubular dentin than the primary, being highly resistant to the penetration of fluids (5).…”

Section: Introductionmentioning

confidence: 99%

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Morphological Study and Analysis of Microhardness and Permeability of the Furcation of Maxillary Premolars

et al. 2016

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The morphology, microhardness and dentin permeability of the furcation region of maxillary premolars were evaluated. Ten premolars were cut lengthwise and the furcation region was delimited. In one group (n=10) microhardness was measured in the buccal, central and palatal regions, in the outer middle and inner layers of the furcation, and in the buccal and palatal regions adjacent to the furcation. Knoop hardness was tested with 10 g load for 15 s. Data were analyzed statistically by ANOVA and Tukey-Kramer test (a=0.05). In the other group (n=10) confocal microscopy was used to study dentin morphology. Other 10 specimens were instrumented with ProTaper and immersed in 10% copper sulfate for analysis of permeability under light microscopy. About microhardness, there was no significant difference (p>0.05) among the buccal (39.9±3.1), central (39.5±4.4) and palatal (39.7±5.0) regions of the furcation, or between these regions and the adjacent buccal (39.1±5.8) and palatal (39.7±5.8) regions (p>0.05). The inner layer (42.3±3.7) had significantly higher microhardness (p<0.05) than the outer layer (37.1±3.9). There was a tendency of calcification of the dentinal tubules from the outer towards the inner layer. The percentage of stained area was 12.45±2.0%, restricted to the outer layer. The buccal, central and palatal regions of the furcation as well as the buccal and palatal adjacent regions had similar microhardness values. In conclusion, the inner dentin layer is harder than the outer dentin layer. The dentinal tubules are sinuous and intertwine towards the middle layer. Dye penetration is restricted to the outer layer.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Analysis Of Dentin Microhardnessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Morphological Study and Analysis of Microhardness and Permeability of the Furcation of Maxillary Premolars

et al. 2016

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A quantitative and diametral analysis of human dentinal tubules at pulp chamber ceiling and floor under scanning electron microscopy

et al. 2014

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The purposes of this study are (i) to evaluate and compare the dentinal tubule density, tubule diameter and percentage area of dentin occupied by tubules at the pulp chamber ceiling and floor; and (ii) to evaluate the effects of age on the number and dimensions of tubule openings. Twelve intact, human mandibular third molars were recruited. Six teeth belonged to patients up to 30 years of age and six teeth belonged to patients over 50 years. Scanning electron microscopic evaluations were made at two different locations: the pulp chamber ceiling and floor. The pulp chamber ceiling presented higher tubule density (P < 0.0001) and greater percentage area of dentin occupied by tubule openings (P < 0.0001) compared to the pulp chamber floor. Also, younger age group had greater tubule diameter (P < 0.0001), higher tubule density (P < 0.0001) and greater percentage area of dentin occupied by tubule openings (P < 0.0001) compared to older age group. Pulp chamber ceiling presents higher tubule density and greater area of exposed tubules. In younger people, the pulp chamber floor presents considerably high tubule diameter. The number and dimensions of dentinal tubule openings significantly decrease with age.

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Gap volume and sealer penetration of C‐shaped root canals obturated with cold hydraulic technique and calcium silicate sealer

et al. 2022

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This study compared the gap volume and sealer penetration in C‐shaped root canals prepared with adaptive core rotary files and obturated with cold hydraulic compaction using calcium‐silicate sealer, warm vertical hybrid compaction, or lateral compaction using epoxy‐resin sealer. Thirty‐six extracted mandibular molars with pulpal floor configuration Types I and III were used. The teeth were prepared using XP‐Shaper and XP‐Finisher and obturated with: group 1: cold hydraulic compaction/calcium silicate, group 2: warm vertical hybrid compaction/epoxy resin, or group 3: lateral compaction/epoxy resin. The gap volume was evaluated using μ‐CT. The sealer penetration depth and area were evaluated using confocal laser scanning microscopy. The gap volume in groups 1, 2, and 3 was 0.82%, 0.24%, 0.80%, respectively, which were not significantly different (p > 0.05). The gap volumes in the obturated C‐shaped canals were not significantly different among the CHC/CSBS, WHC/ERS, or LC/ERS groups. CHC/CSBS was the most convenient technique.

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Morphology and Microhardness of Dentin at the Furcation Area of Mandibular Molars

Cited by 3 publications

References 16 publications

Morphological Study and Analysis of Microhardness and Permeability of the Furcation of Maxillary Premolars

Morphological Study and Analysis of Microhardness and Permeability of the Furcation of Maxillary Premolars

A quantitative and diametral analysis of human dentinal tubules at pulp chamber ceiling and floor under scanning electron microscopy

Gap volume and sealer penetration of C‐shaped root canals obturated with cold hydraulic technique and calcium silicate sealer

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