Root dentine thickness of danger zone in mesial roots of mandibular first molars

Zhou, Guangchao; Leng, Diya; Li, Mingming; Zhou, Yang; Zhang, Cuifeng; Sun, Chao; Wu, Daming

doi:10.21203/rs.2.10718/v3

Cited by 6 publications

(13 citation statements)

References 29 publications

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“…The mesial root was mainly ribbon-shaped in cross-section and the distal root was kidney-shaped. This emphasizes the essential care required during canals enlargement of such molars so that procedural errors such as perforations can be avoided in danger zones of thin dentine due to anatomical depressions and grooves of roots' surfaces (30).…”

Section: Discussionmentioning

confidence: 99%

Root and Canal Configuration of Mandibular First Molars in a Yemeni Population: A Cone-beam Computed Tomography

2020

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To describe root and canal morphology of mandibular first molars (MFMs) in a Yemeni population using cone-beam computed tomography (CBCT). Methods: CBCT images of 500 right and left untreated MFMs with fully developed roots from 250 Yemenis (125 male and 125 female) comprised the sample size of this study. The following characteristics were recorded: (1) number of roots and their type and morphology, (2) number of canals orifices per root, (3) type of canal configuration and (4) primary variations in the morphology of the root and canal systems. Results: 96.8% of MFMs are double-rooted. A third root was found in 3.2%, more in females than males. Mesial root was mainly ribbon-shaped (92.2%) and distal root was kidney-shaped in 56.2%. Two canals orifices were found in mesial root of 95.8% and one canal orifice was found in distal root of 96.4%. Vertucci type II canal configuration was the most frequent (57%), followed by type IV (35.6%) in mesial root. Type III canal configuration was the most prevalent (48.8%), followed by type I (41%) in distal root. Variant 3 represented the most common root and canal morphology (89.8%). Conclusion:MFMs in Yemeni population are mainly two-rooted with 3.2% having a supernumerary distolingual root. Cross section of mesial root was mainly ribbon-shaped and distal root was kidney-shaped. Vertucci type II and III configurations were the higher incidence in mesial and distal roots, respectively. The presence of two canals in mesial root and one canal in distal root of MFMs with two separate roots (variant 3) was the most common morphology.

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Section: Discussionmentioning

confidence: 99%

Root and Canal Configuration of Mandibular First Molars in a Yemeni Population: A Cone-beam Computed Tomography

2020

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“…Bununla beraber, Zhou ve ark. 19 ise diş boyu azaldıkça dentin kalınlığının tam tersine azaldığını ve önceki çalışmalardakinden farklı bu bulgunun kaynağının ırksal farklılıklardan olabileceğini söylemişlerdir.…”

Section: Discussionunclassified

“…benzer bir çalışmayı mandibular molarların boy uzunluklarına göre yapmış ve furkasyondan 2 mm aşağıda dentin kalınlığının diş boyu uzadıkça azaldığını bulmuşlardır. Bununla beraber, Zhou ve ark 19. iseTablo 2.…”

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Mandibular molar dişlerde kanal duvarı kalınlığının dental volümetrik tomografi ile değerlendirilmesi

Önem

Şen

Turhal³

et al. 2021

Acta Odontologica Turcica

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Bu çalışmanın amacı, mandibular 1. ve 2. molar dişlere ait kanalların interradiküler bölgeye olan uzaklığını dental volümetrik tomografi (DVT) üzerinde ölçmektir. GEREÇ VE YÖNTEM: Seksen hastaya ait mandibular DVT görüntülerindeki 50 adet 1. molar ve 50 adet 2. molar diş retrospektif olarak incelendi. Aksiyel kesitlerde bifurkasyon seviyesinin 2 mm altından, tüm kanalların dış sınırından interradiküler bölgeye olan en kısa mesafe kanal duvar kalınlığı ölçülerek kaydedildi. Ölçümler 2 radyolog tarafından yapıldı ve her alan için aritmetik ortalama alındı. Gruplar arasındaki farklar iki yönlü varyans analizi kullanılarak karşılaştırıldı. İkili karşılaştırmalar için ise Tukey HSD testi kullanıldı (p=0.05). BULGULAR: Mandibular 1. ve 2. molar diş kanallarına ait ölçümler grup olarak değerlendirildiğinde aralarındaki farkın istatistiksel olarak anlamlı olduğu gözlendi (p=0.009). Buna göre, 1. molar dişlerin kanalları interradiküler bölgeye, 2. molar dişlere göre daha yakındı. Kanal duvarı kalınlıkları, her bir molar grubunun kendi içerisinde birbirleriyle ikili olarak karşılaştırıldığında, meziobukkal (MB) kanalın en düşük değere sahip olduğu gözlendi (p<0.05). Distal kanalın bifurkasyona uzaklığı MB ve meziolingual (ML) kanallardan daha fazlaydı (p=0.000). Distobukkal (DB) ve distolingual (DL) kanallar arasında ise herhangi bir istatistiksel fark saptanmadı (p>0.05). SONUÇ: Mandibular 1. molar dişlerin kanallarının interradiküler bölgeye ortalama uzaklıkları, 2. molar dişlere göre daha azdı. Tüm mandibular molar dişlerdeki kanalların interradiküler bölgeye ortalama uzaklık değerleri açısından sıralanışları MB

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“…According to the axial images at 2 and 3 mm under furcation, the DT of distal wall of mesiobuccal (MB) and mesiolingual (MLi) canals and mesial wall of distal canal was measured by calculating the minimum distance from the edge of the root canal to the external surface of its root. [ 11 ] The values were measured thrice, and the mean values were recorded.…”

Section: Methodsmentioning

confidence: 99%

“…[ 10 ] In mandibular first molar, the distal wall of mesial root has limited dentin thickness (DT), around 2–4 mm under the furcation. [ 11 12 13 14 ] Data remain lacking in terms of the correlation of DT and aging.…”

Section: Introductionmentioning

confidence: 99%

Comparing the pulp/tooth area ratio and dentin thickness of mandibular first molars in different age groups: A cone-beam computed tomography study

Chaleefong¹,

Prapayasatok²,

Nalampang³

et al. 2021

J Conserv Dent

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Context: Mandibular first molar frequently requires endodontic treatment. Understanding age-related changes in pulp-dentin complex and root canal morphologies is essential for successful endodontic and restorative treatments. Aim: This study aimed to compare pulp/tooth area ratio (PTAR) and dentin thickness (DT) in mandibular first molars in different age groups through cone-beam computed tomography (CBCT) imaging. Subjects and Methods: One hundred CBCT images of mandibular first molar were divided into five groups; age 20–29, 30–39, 40–49, 50–59, and 60 years old and older. Axial images were used to determine PTAR at Level A (furcation), Level B (between Levels A and C), and Level C (half distance between the furcation and apex of the root). The minimum DT of the distal wall of mesiobuccal (MB) and mesiolingual (MLi) canal and mesial wall of distal canal at 2 and 3 mm under the furcation was measured. Statistical Analysis Used: Analysis of variance was used to determine differences among age groups. Results: PTAR was determined to reduce as age increases, showing a significant difference among the age groups at Levels A, B, and C of both roots ( P < 0.05). The minimum DT was found to increase with age, demonstrating a significant difference among the age groups of MB and MLi canal at 2 and 3 mm ( P < 0.05). No statistically significant difference was observed in the mesial DT of distal canal. Conclusions: The reduction of PTAR and the increasing DT were confirmed with advanced age.

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Root dentine thickness of danger zone in mesial roots of mandibular first molars

Cited by 6 publications

References 29 publications

Root and Canal Configuration of Mandibular First Molars in a Yemeni Population: A Cone-beam Computed Tomography

Root and Canal Configuration of Mandibular First Molars in a Yemeni Population: A Cone-beam Computed Tomography

Mandibular molar dişlerde kanal duvarı kalınlığının dental volümetrik tomografi ile değerlendirilmesi

Comparing the pulp/tooth area ratio and dentin thickness of mandibular first molars in different age groups: A cone-beam computed tomography study

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