An Anatomic Investigation of the Mandibular First Molar Using Micro–Computed Tomography

Harris, Samantha P.; Bowles, Walter R.; Fok, Alex; McClanahan, Scott B.

doi:10.1016/j.joen.2013.06.034

Cited by 104 publications

(119 citation statements)

References 20 publications

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“…Moreover, an average of 3.77 apical foramina was observed in each specimen. This finding is consistent with that reported by Harris et al (16). The apical delta was observed in 80% of our study specimens, indicating a high possibility of apical ramification.…”

Section: Discussionsupporting

confidence: 94%

“…The average longest distance between the orifices at 1.5 mm above the furcation in this study was similar to that previously reported (16). We believe that these results may help clinicians in detecting a missed canal with a calcified orifice and minimize the risk for perforation.…”

Section: Discussionsupporting

confidence: 90%

“…The incidence of MMCs in the mandibular first molar ranges from 1 to 36% (1,8,14,16). The occurrence of the ML fin type is reportedly more common than that of the MB fin type, whereas the independent type is not commonly encountered (14).…”

Section: Discussionmentioning

confidence: 99%

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Anatomical profile of the mesial root of the Burmese mandibular first molar with Vertucci’s type IV canal configuration

Moe

Jin

et al. 2017

Journal of Oral Science

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This study evaluated the anatomical profile of the mesial root canals of the Burmese mandibular first molar with Vertucci's type IV canal configuration (VT4) using microcomputed tomography analysis. Seventy-five mesial roots of extracted mandibular first molars were scanned and evaluated. Fourteen middle mesial canals (MMCs) were observed in the specimens; each specimen had an average of 1.63 lateral canals and 3.77 apical foramina. The lateral canals arising from the mesiobuccal canal, mesiolingual canal, MMC, and isthmus terminated at an average distance of 0.92, 0.73, 2.11, and 1.89 mm, respectively, from the apex. The mean distance between the centers of the mesiobuccal and mesiolingual canals at 1.5 mm coronal to the furcation was 2.60 mm. A higher incidence of isthmus was observed in the apical 2-6-mm region compared with the apical 0-2-mm region (P < 0.05). The incidence of lateral canals in the isthmus was similar to that of the mesiobuccal and mesiolingual canals (P > 0.05). This study shows that the mesial root of the Burmese mandibular first molar with VT4 has complex anatomical profiles comprising MMCs and isthmus and their lateral canals.

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Section: Discussionsupporting

confidence: 94%

Section: Discussionsupporting

confidence: 90%

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Anatomical profile of the mesial root of the Burmese mandibular first molar with Vertucci’s type IV canal configuration

Moe

Jin

et al. 2017

Journal of Oral Science

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“…Due to the great anatomical variations, in both mesial and distal roots, and a high frequency of accessory canals, we are also (5) of the opinion that endodontic instruments and treatment techniques should be carefully selected in order to avoid mishaps; thus, compromising success during endodontic treatment (5). With the morphology knowledge reported in this and other micro-computer tomography investigations (5,7,11,13,(16)(17)(18)(23)(24)(25), the importance of appropriate root canal preparation systems and irrigating solution selection becomes evident when considering the three dimensionality of the root canal system.…”

Section: Discussionmentioning

confidence: 91%

Root Canal Morphology and Configuration of 118 Mandibular First Molars by Means of Micro–Computed Tomography: An Ex Vivo Study

Wolf

Paqué

Zeller

et al. 2016

Journal of Endodontics

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INTRODUCTION The aim of this study was to investigate the root canal system morphology of the mandibular first molar by means of micro-computed tomography. METHODS The root canal configuration, foramina, and accessory canals frequency of 118 mandibular first molars were investigated by means of micro-computed tomography and 3-dimensional software imaging. A 4-digit system describes the root canal configuration from the coronal to apical thirds and the main foramina number. RESULTS The most frequent root canal configurations in mesial root were 2-2-2/2 (31.4%), 2-2-1/1 (15.3%), and 2-2-2/3 (11.9%); another 24 different root canal configurations were observed in this root. A 1-1-1/1 (58.5%), 1-1-1/2 (10.2%), and 16 other root canal configurations were observed in the distal root. The mesiobuccal root canal showed 1-4 foramina in 24.6%, and the mesiolingual showed 1-3 foramina in 28.0%. One connecting canal between the mesial root canals was observed in 30.5% and 2 in 3.4%. The distolingual root canal showed 1-4 foramina in 23.7%, whereas a foramen in the distobuccal root canal was rarely detected (3.4%). The mesiobuccal, mesiolingual, and distolingual root canals showed at least 1 accessory canal (14.3, 10.2, and 4.2%, respectively), but the distobuccal had none. CONCLUSIONS The root canal configuration of mandibular first molars varies strongly. According to our expectations, both the mesial and distal roots showed a high number of morphologic diversifications. The root canal system of the mesial root showed more root canal configuration variations, connecting and accessory canals than the distal root.

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“…Shaping and filling the root canal by preserving curvature is one of the main parameters for analyzing root canal treatment materials or methods. Researchers have indicated that the mesial canals of mandibular molars are complex to work with because most are narrow and curved (10,27). Therefore, achieving optimal results in terms of antibacterial and shaping ability is difficult.…”

Section: Discussionmentioning

confidence: 99%

3D Micro-CT Analysis of Void and Gap Formation in Curved Root Canals

Şımşek¹,

Keleş²,

Ahmetoğlu³

et al. 2017

Eur Endod J

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Objective: This study used microcomputed tomography (micro-CT) to compare the volumes of voids and gaps in curved root canals instrumented and filled using various techniques. Methods: Twenty extracted mandibular first molars with two curved mesial root canals were used. Root canals were instrumented using a self-adjusting file (SAF) or Revo-S file system. For standardization, mesiobuccal canals were instrumented with SAF and mesiolingual canals were instrumented with Revo-S in each root. The canals were divided into four experimental groups (n=10 in each). The canals were then filled via cold lateral compaction (CLC) or a thermoplasticized injectable technique (TT) using gutta-percha and AH Plus root canal sealer. The roots were scanned with a micro-CT, and the volumes of the voids and gaps were calculated using three-dimensional (3D) micro-CT images. Data were analyzed using unpaired t-and Kruskal-Wallis tests. A value of P < 0.05 was considered significant. Results: None of the tested techniques provided void-or gap-free fillings. Nevertheless, the SAF showed more gap formation than the Revo-S, and TT showed higher gap formation in all experimental groups. These differences, however, were not statistically significant (p>0.05). Conclusion:The SAF and Revo-S rotary file systems yielded comparable results. No statistically significant difference was found between the results of the various instrumentation and filling techniques.

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An Anatomic Investigation of the Mandibular First Molar Using Micro–Computed Tomography

Cited by 104 publications

References 20 publications

Anatomical profile of the mesial root of the Burmese mandibular first molar with Vertucci’s type IV canal configuration

Anatomical profile of the mesial root of the Burmese mandibular first molar with Vertucci’s type IV canal configuration

Root Canal Morphology and Configuration of 118 Mandibular First Molars by Means of Micro–Computed Tomography: An Ex Vivo Study

3D Micro-CT Analysis of Void and Gap Formation in Curved Root Canals

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