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Research article
Computer-aided three-dimensional assessment of periodontal healing distal to the mandibular second molar after coronectomy of the mandibular third molar: a prospective study
Nianhui Cui
Peking University School of Stomatology
Corresponding Author
ORCiD: https://orcid.org/0000-0003-0642-5942
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published version at BMC Oral Health.
Background
The periodontal healing distal to the mandibular second molar (M2M) after coronectomy of the M3M was controversary. This study aimed to combine a digital method with cone-beam computed tomography (CBCT) and estimate periodontal healing of M2M after M3M coronectomy. An accurate and stable indicator in three dimensions was also tentatively explored.
Methods
Patients with a M3M in contact with the inferior alveolar canal were included. CBCT was applied immediately after coronectomy (baseline) and 6-months later. Data were investigated with digital software for registration. Previously reported and coronectomy-related factors were included for univariate and multivariate analyses.
Results
A total of 181 patients (213 M3Ms) completed 6-month follow-up. Significant reduction in the distal intra-bony defect (DBD) depth of the M2M was shown (1.28 ± 1.24 mm, P < 0.001). DBD depth of the M2M at baseline was the most influential factor (r = 0.59), followed by preoperative M3M condition, age, rotation and eruption of the root complex. Remaining enamel (OR = 6.93) and small retromolar space (0.67) contributed to re-contact of the root complex and M2M. Bone volume regenerated in the distal 2 mm was associated significantly with DBD-depth reduction (r = 0.74, P < 0.001).
Conclusions
Bone volume regenerated in the distal 2 mm of the M2M denoted stability of distal periodontal healing of the M2M. DBD depth at baseline was the most influential factor for healing of a DBD of the M2M after M3M coronectomy. The remaining enamel and a small retromolar space could contribute to re-contact of the root complex and the M2M.
Trial registration:
China Clinical Trial Center, ChiCTR1800014862. Registered 10 February 2018, http://www.chictr.org.cn/showproj.aspx?proj=24216
Keywords
coronectomy, Computer-aided 3D assessment, distal intra-bony defect, periodontal healing, re-contact, volume of bone regenerated in the distal 2 mm
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On 24 Sep, 2020
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On 24 Sep, 2020
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Received 23 Jun, 2020
Editor assigned
On 16 Jun, 2020
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Invitations sent on 16 Jun, 2020
Reviewer #1 agreed
On 16 Jun, 2020
Reviewer #2 agreed
On 16 Jun, 2020
Reviewer #3 agreed
On 16 Jun, 2020
Review #1 received
Received 16 Jun, 2020
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On 12 Jun, 2020
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On 12 Jun, 2020
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This preprint is under consideration at BMC Oral Health. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research article
Computer-aided three-dimensional assessment of periodontal healing distal to the mandibular second molar after coronectomy of the mandibular third molar: a prospective study
Nianhui Cui
Peking University School of Stomatology
Corresponding Author
ORCiD: https://orcid.org/0000-0003-0642-5942
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Published
Version 1
Posted 15 Jun, 2020
Published
On 24 Sep, 2020
Published
On 24 Sep, 2020
No community comments so far
Review #2 received
Received 23 Jun, 2020
Editor assigned
On 16 Jun, 2020
Reviewers invited
Invitations sent on 16 Jun, 2020
Reviewer #1 agreed
On 16 Jun, 2020
Reviewer #2 agreed
On 16 Jun, 2020
Reviewer #3 agreed
On 16 Jun, 2020
Review #1 received
Received 16 Jun, 2020
Submission checks complete
On 12 Jun, 2020
Editor invited
On 12 Jun, 2020
First submitted
On 02 Jun, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published version at BMC Oral Health.
Background
The periodontal healing distal to the mandibular second molar (M2M) after coronectomy of the M3M was controversary. This study aimed to combine a digital method with cone-beam computed tomography (CBCT) and estimate periodontal healing of M2M after M3M coronectomy. An accurate and stable indicator in three dimensions was also tentatively explored.
Methods
Patients with a M3M in contact with the inferior alveolar canal were included. CBCT was applied immediately after coronectomy (baseline) and 6-months later. Data were investigated with digital software for registration. Previously reported and coronectomy-related factors were included for univariate and multivariate analyses.
Results
A total of 181 patients (213 M3Ms) completed 6-month follow-up. Significant reduction in the distal intra-bony defect (DBD) depth of the M2M was shown (1.28 ± 1.24 mm, P < 0.001). DBD depth of the M2M at baseline was the most influential factor (r = 0.59), followed by preoperative M3M condition, age, rotation and eruption of the root complex. Remaining enamel (OR = 6.93) and small retromolar space (0.67) contributed to re-contact of the root complex and M2M. Bone volume regenerated in the distal 2 mm was associated significantly with DBD-depth reduction (r = 0.74, P < 0.001).
Conclusions
Bone volume regenerated in the distal 2 mm of the M2M denoted stability of distal periodontal healing of the M2M. DBD depth at baseline was the most influential factor for healing of a DBD of the M2M after M3M coronectomy. The remaining enamel and a small retromolar space could contribute to re-contact of the root complex and the M2M.
Trial registration:
China Clinical Trial Center, ChiCTR1800014862. Registered 10 February 2018, http://www.chictr.org.cn/showproj.aspx?proj=24216
Figure 1
Figure 2