Abstract:
OBJECTIVES:This study evaluated the danger zone (DZ) in mesial roots of mandibular molars and the correlation between anatomical references of the DZ and some anatomical landmarks including tooth/root length, depth of mesial and distal grooves, and inter-canal orifices distance. MATERIAL AND METHODS:Twenty-eight mesial roots of mandibular molars with 2 independent canals were scanned and divided into 2 groups according to root length. The anatomical landmarks were correlated (Pearson or Spearman coefficients) with root level, thickness, and position of the DZ and also compared (independent samples t or Mann-Whitney tests) between the 2 groups at α = 5%. RESULTS:No statistical difference was observed between groups regarding DZ parameters and depth of mesial and distal grooves (P > 0.05). Orifice distance in group 2 (4.49 ± 0.75 mm) was significantly greater than group 1 (3.76 ± 0.89 mm) (P < 0.05). Significant correlations (P < 0.05) were found between (i) DZ level and root/tooth length (r = 0.54 and 0.49, respectively), (ii) DZ thickness and distal groove depth (r = - 0.45), and orifice distance (r = 0.38), and (iii) DZ position and depth of mesial (r = 0.39) and distal (r = 0.40) grooves. Other variables such as root length and distal groove depth (r = 0.28), and orifice distance and mesial groove depth (r = 0.36) were also correlated (P < 0.05). CONCLUSIONS:The length of tooth/root, the distance of canal orifices, and the depth of mesial/distal grooves of mesial roots of mandibular molars might be predictive factors for the root level, position, and thickness of the DZ. CLINICAL RELEVANCE:The length, distance of mesial canal orifices, and the depth of mesial and distal grooves of the mesial roots of mandibular molars might be moderate predictive factors for the root level, position, and thickness of the DZ.
journal_name
Clin Oral Investigjournal_title
Clinical oral investigationsauthors
De-Deus G,Rodrigues EA,Lee JK,Kim J,da Silva EJNL,Belladonna FG,Cavalcante DM,Simões-Carvalho M,Oliveira DDS,Versiani MA,Souza EMdoi
10.1007/s00784-020-03686-7subject
Has Abstractpub_date
2020-11-24 00:00:00eissn
1432-6981issn
1436-3771pii
10.1007/s00784-020-03686-7pub_type
杂志文章abstract:OBJECTIVES:Albumin has a known capability to modulate free serum concentrations of proteins produced by tumour cells. The technique of spin probe labelling of albumin followed by electron paramagnetic resonance (EPR) spectroscopy may allow identification of these structural and functional changes, which regularly occur...
journal_title:Clinical oral investigations
pub_type: 杂志文章
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journal_title:Clinical oral investigations
pub_type: 杂志文章,meta分析,评审
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journal_title:Clinical oral investigations
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pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:2019-02-01 00:00:00
abstract:: ...
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pub_type: 信件
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pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:2019-01-01 00:00:00
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pub_type: 杂志文章
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更新日期:2019-06-01 00:00:00