Risk factors observed in 2-dimensional radiographs for permanent injury of the inferior alveolar nerve after removal of mandibular third molars: a case-control study

Louise Hauge Matzen; Lars Bo Petersen; Lars Schropp; Louise Hermann; Ann Wenzel

doi:10.1016/j.oooo.2023.05.009

Risk factors observed in 2-dimensional radiographs for permanent injury of the inferior alveolar nerve after removal of mandibular third molars: a case-control study

Louise Hauge Matzen^*, Lars Bo Petersen, Lars Schropp, Louise Hermann, Ann Wenzel

^*Corresponding author for this work

Department of Dentistry and Oral Health - Section for Oral Radiology and Endodontics

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

Abstract

Objective: To assess whether differences exist in signs observed in 2D radiographs of mandibular third molars between a case group of patients with and a control group without permanent sensory disturbance of the inferior alveolar nerve (IAN) after removal. Study Design: Three observers blinded to patient status assessed radiographs from the case group (n=162) and the control group (n=172). Two new signs, craniocaudal relation of the roots and the mandibular canal and position of the canal over the roots; and 4 “classic” signs, interruption of the white borders of the canal, darkening of the roots, narrowing of the canal lumen, and diversion of the canal over the roots were registered. Chi-square tests assessed differences in distribution of radiographic signs between the groups. Odds ratios expressed the association between radiographic signs and permanent sensory disturbance. Inter- and intraobserver reliability values were calculated. Results: We found significantly more teeth with roots positioned inferiorly to the canal borders (P<0.001; OR 4.1-5.3) and with the canal superimposed over the upper or middle third of the roots (P<0.001; OR 2.6-3.9) in the case group than in the control group. Inter- and intraobserver reproducibility was excellent for roots inferior to the canal borders and fair to good for canal superimposition. Conclusions: Two radiographic signs are valid predictors of permanent sensory disturbance of the IAN in 2D radiographs.

Original language	English
Journal	Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Volume	136
Issue	4
Pages (from-to)	490-499
Number of pages	10
ISSN	2212-4403
DOIs	https://doi.org/10.1016/j.oooo.2023.05.009
Publication status	Published - Oct 2023

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10.1016/j.oooo.2023.05.009

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@article{2b38f9c452e242efb4691bddb7906b0f,

title = "Risk factors observed in 2-dimensional radiographs for permanent injury of the inferior alveolar nerve after removal of mandibular third molars: a case-control study",

abstract = "Objective: To assess whether differences exist in signs observed in 2D radiographs of mandibular third molars between a case group of patients with and a control group without permanent sensory disturbance of the inferior alveolar nerve (IAN) after removal. Study Design: Three observers blinded to patient status assessed radiographs from the case group (n=162) and the control group (n=172). Two new signs, craniocaudal relation of the roots and the mandibular canal and position of the canal over the roots; and 4 “classic” signs, interruption of the white borders of the canal, darkening of the roots, narrowing of the canal lumen, and diversion of the canal over the roots were registered. Chi-square tests assessed differences in distribution of radiographic signs between the groups. Odds ratios expressed the association between radiographic signs and permanent sensory disturbance. Inter- and intraobserver reliability values were calculated. Results: We found significantly more teeth with roots positioned inferiorly to the canal borders (P<0.001; OR 4.1-5.3) and with the canal superimposed over the upper or middle third of the roots (P<0.001; OR 2.6-3.9) in the case group than in the control group. Inter- and intraobserver reproducibility was excellent for roots inferior to the canal borders and fair to good for canal superimposition. Conclusions: Two radiographic signs are valid predictors of permanent sensory disturbance of the IAN in 2D radiographs.",

author = "Matzen, {Louise Hauge} and Petersen, {Lars Bo} and Lars Schropp and Louise Hermann and Ann Wenzel",

note = "Publisher Copyright: {\textcopyright} 2023 Elsevier Inc.",

year = "2023",

month = oct,

doi = "10.1016/j.oooo.2023.05.009",

language = "English",

volume = "136",

pages = "490--499",

journal = "Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology",

issn = "2212-4403",

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}

Matzen, LH, Petersen, LB, Schropp, L , Hermann, L & Wenzel, A 2023, 'Risk factors observed in 2-dimensional radiographs for permanent injury of the inferior alveolar nerve after removal of mandibular third molars: a case-control study', Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology, vol. 136, no. 4, pp. 490-499. https://doi.org/10.1016/j.oooo.2023.05.009

Risk factors observed in 2-dimensional radiographs for permanent injury of the inferior alveolar nerve after removal of mandibular third molars: a case-control study. / Matzen, Louise Hauge; Petersen, Lars Bo; Schropp, Lars et al.
In: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology, Vol. 136, No. 4, 10.2023, p. 490-499.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

TY - JOUR

T1 - Risk factors observed in 2-dimensional radiographs for permanent injury of the inferior alveolar nerve after removal of mandibular third molars

T2 - a case-control study

AU - Matzen, Louise Hauge

AU - Petersen, Lars Bo

AU - Schropp, Lars

AU - Hermann, Louise

AU - Wenzel, Ann

PY - 2023/10

Y1 - 2023/10

N2 - Objective: To assess whether differences exist in signs observed in 2D radiographs of mandibular third molars between a case group of patients with and a control group without permanent sensory disturbance of the inferior alveolar nerve (IAN) after removal. Study Design: Three observers blinded to patient status assessed radiographs from the case group (n=162) and the control group (n=172). Two new signs, craniocaudal relation of the roots and the mandibular canal and position of the canal over the roots; and 4 “classic” signs, interruption of the white borders of the canal, darkening of the roots, narrowing of the canal lumen, and diversion of the canal over the roots were registered. Chi-square tests assessed differences in distribution of radiographic signs between the groups. Odds ratios expressed the association between radiographic signs and permanent sensory disturbance. Inter- and intraobserver reliability values were calculated. Results: We found significantly more teeth with roots positioned inferiorly to the canal borders (P<0.001; OR 4.1-5.3) and with the canal superimposed over the upper or middle third of the roots (P<0.001; OR 2.6-3.9) in the case group than in the control group. Inter- and intraobserver reproducibility was excellent for roots inferior to the canal borders and fair to good for canal superimposition. Conclusions: Two radiographic signs are valid predictors of permanent sensory disturbance of the IAN in 2D radiographs.

AB - Objective: To assess whether differences exist in signs observed in 2D radiographs of mandibular third molars between a case group of patients with and a control group without permanent sensory disturbance of the inferior alveolar nerve (IAN) after removal. Study Design: Three observers blinded to patient status assessed radiographs from the case group (n=162) and the control group (n=172). Two new signs, craniocaudal relation of the roots and the mandibular canal and position of the canal over the roots; and 4 “classic” signs, interruption of the white borders of the canal, darkening of the roots, narrowing of the canal lumen, and diversion of the canal over the roots were registered. Chi-square tests assessed differences in distribution of radiographic signs between the groups. Odds ratios expressed the association between radiographic signs and permanent sensory disturbance. Inter- and intraobserver reliability values were calculated. Results: We found significantly more teeth with roots positioned inferiorly to the canal borders (P<0.001; OR 4.1-5.3) and with the canal superimposed over the upper or middle third of the roots (P<0.001; OR 2.6-3.9) in the case group than in the control group. Inter- and intraobserver reproducibility was excellent for roots inferior to the canal borders and fair to good for canal superimposition. Conclusions: Two radiographic signs are valid predictors of permanent sensory disturbance of the IAN in 2D radiographs.

U2 - 10.1016/j.oooo.2023.05.009

DO - 10.1016/j.oooo.2023.05.009

M3 - Journal article

C2 - 37357068

AN - SCOPUS:85163410404

SN - 2212-4403

VL - 136

SP - 490

EP - 499

JO - Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology

JF - Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology

IS - 4

ER -

Risk factors observed in 2-dimensional radiographs for permanent injury of the inferior alveolar nerve after removal of mandibular third molars: a case-control study

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