Three-dimensional assessment of root migration and rotation patterns after coronectomy: bone-embedded roots versus soft tissue-covered roots

Yan, Zi-Yu; Wang, F.; Yan, Xia; Ge, Na; Guo, Chuanbin; Liu, K.; Cui, Nian-Hui

doi:10.1016/j.ijom.2020.09.015

Cited by 6 publications

(6 citation statements)

References 26 publications

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“…A recent study by Yan et al [26] investigated root migration after coronectomy and the mean recorded migration distance was 4.05 ± 1.98 mm. ey discovered that preoperative conditions of the lower third molar, such as impaction depth, retromolar space, and angulation, influence root migration from apex to crown.…”

Section: Discussionmentioning

confidence: 98%

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Evaluation of the Outcomes of Coronectomy Procedure versus Surgical Extraction of Lower Third Molars Which Have a High Risk for Inferior Alveolar Nerve Injury: A Systematic Review

Abu-Mostafa

AlRejaie

Almutairi

et al. 2021

International Journal of Dentistry

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Background and Objectives. Surgical extraction of mandibular third molars (3rd M) may cause inferior alveolar nerve injury (IANI), whereas in coronectomy the crowns of 3rd M are removed, keeping the roots intact to avoid IANI. This study aims to review the literature which evaluated coronectomy effectiveness as an alternative for surgical extraction of 3rd M that have a high risk of trauma to the inferior alveolar canal. A computerized literature search was conducted on the databases PubMed, SCOPUS, and ScienceDirect to gather information regarding the coronectomy procedure from inception till June 5, 2020. A total of 97 articles were identified, and seven studies were finally included for conducting qualitative analysis: 3 randomized clinical trials and 4 clinical controlled trials. Cochrane Collaboration’s tool was used for assessing risk of bias. Coronectomy procedures were performed on 15–171 teeth. In the control group, extraction procedures were done on 15–178 teeth. Results. No study reported permanent inferior alveolar nerve injury (p-IANI) regarding coronectomy; however, transient inferior alveolar nerve injury (t-IANI) was reported in 0–2.20% of successful coronectomy and 0–8% of failed coronectomy. Postextraction t-IANI ranged from 0% to 16.66% while p-IANI from 0% to 3.63%. In 5 studies, root migration occurred in 2% to 85.3% of cases and the distance rate was 2.33–3.43 mm at 6 months postoperatively; then the migration gradually decreased and stopped at 12 months. Conclusion. This systematic review revealed that coronectomy is an efficient alternative for the management of impacted 3rd M with a high risk of IANI. Patients who got antibiotics postcoronectomy procedures had lower infection rates than those who did not receive antibiotic therapy. We recommend further research on coronectomy with longer follow-up periods to assess the retained roots’ long-term outcomes and to assess the effect of antibiotics administration on postcoronectomy infection rate. This systematic review is registered under number CRD42020198394.

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Section: Discussionmentioning

confidence: 98%

“…No root eruption was observed though many of roots had moved to the alveolar crest. Yan et al [26] pointed out that the length of the root complex must be less than 7.6 mm, and the gap between the root and the alveolar crest must be at least ≥5 mm to avoid root exposure and the need for secondary surgery.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Outcomes of Coronectomy Procedure versus Surgical Extraction of Lower Third Molars Which Have a High Risk for Inferior Alveolar Nerve Injury: A Systematic Review

Abu-Mostafa

AlRejaie

Almutairi

et al. 2021

International Journal of Dentistry

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“…Digital techniques could improve the accuracy and reproducibility of comparative analyses by superimposing models from different times through best‐fit match algorithms (Yan et al., 2021). However, the measurement was still subject to unavoidable errors.…”

Section: Discussionmentioning

confidence: 99%

“…The digital models of mandible bone containing P2 and P4 bone defects were segmented, stored in stereolithography (STL) format and imported to another software, GeoMagic™ Studio 12 (3D Systems, Rock Hill, SC, USA). According to anatomical features of the mandible, models of the same beagle dog from different times (baseline, Po.3 m, Po.6 m) were superimposed, which is referred as "registration" in GeoMagic software, using "best-fit" alignment algorithm (Yan et al, 2020(Yan et al, , 2021; Figure 2a). The root-mean-square (RMS, measures deviation of the mesh geometry from the desired reference surface) was calculated by this algorithm to evaluate the geometric deviation of registration (measurement error).…”

Section: Construction and Registration Of Digital Modelsmentioning

confidence: 99%

Alveolar ridge preservation of two‐wall bone defects using mineralized dentin matrix: An experimental pre‐clinical study

Yan,

Wang,

Han

et al. 2024

Clinical Oral Implants Res

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ObjectivesTo study bone healing of two‐wall bone defects after alveolar ridge preservation using mineralized dentin matrix.Materials and MethodsAfter distal roots extraction of second and fourth premolars (P2, P4) on one lateral mandible in 12 beagles, two‐wall bone defects (5 × 5 × 5 mm) were surgically created distally to the remaining mesial roots of P2 and P4. A total of 24 sites were randomly allocated to three groups (implant material‐ time of execution): mineralized dentin matrix (MDM)‐3 m (MDM + collagen membrane; 3 months), MDM‐6 m (MDM particles + collagen membrane; 6 months), and C‐6 m (collagen membrane only; 6 months). Clinical, radiographic, digital, and histological examinations were performed 3 and 6 months after surgery.ResultsThe bone healing in MDM groups were better compared to Control group (volume of bone regenerated in total: 25.12 mm3 vs. 13.30 mm3, p = .046; trabecular volume/total volume: 58.84% vs. 39.18%, p = .001; new bone formation rate: 44.13% vs. 31.88%, p = .047). Vertically, the radiological bone level of bone defect in MDM‐6 m group was higher than that in C‐6 m group (vertical height of bone defect: 1.55 mm vs. 2.74 mm, p = .018). Horizontally, no significant differences in buccolingual bone width were found between MDM and C groups at any time or at any level below the alveolar ridge. The percentages of remaining MDM were <1% in both MDM‐3 m and MDM‐6 m groups.ConclusionsMDM improved bone healing of two‐wall bone defects and might be considered as a socket fill material used following tooth extraction.

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“…Root eruption in the oral cavity is very rare (0–2.3%) – even in those cases where it reaches the crest – as the absence of occlusal forces in the retromolar zone allows the soft tissue on the alveolar crest to resist root eruption ( 11 ). Despite this, in case no.…”

Section: Discussionmentioning

confidence: 99%

Coronectomy of lower third molars in intimate relation to the inferior alveolar nerve: A report of two cases

Salgado-Peralvo,

Kewalramani,

Madruga-González

et al. 2024

J Clin Exp Dent

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Damage to the inferior alveolar nerve (IAN) secondary to the extraction of the lower third molar (LTM) is a relatively frequent complication (0.35–8.40%) that can cause temporary or permanent nerve damage. Coronectomy has been proposed as an alternative, which consists of sectioning the coronary portion of the LTM, and deliberately leaving the radicular portion with the pulp intact. Two clinical cases are presented in this article, in which root migration (0–0.3 mm) and a change of angulation (+2º to +9°) occurred. None of the cases developed complications during the follow-up period (12 months). Therefore, coronectomy is a procedure to be considered in selected cases as an alternative to conventional exodontia of the LTM to avoid possible damage to the IAN. Key words: Case report, third molar, mandibular third molar, coronectomy, mandibular nerve, mandibular nerve injuries, root migration.

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Three-dimensional assessment of root migration and rotation patterns after coronectomy: bone-embedded roots versus soft tissue-covered roots

Cited by 6 publications

References 26 publications

Evaluation of the Outcomes of Coronectomy Procedure versus Surgical Extraction of Lower Third Molars Which Have a High Risk for Inferior Alveolar Nerve Injury: A Systematic Review

Evaluation of the Outcomes of Coronectomy Procedure versus Surgical Extraction of Lower Third Molars Which Have a High Risk for Inferior Alveolar Nerve Injury: A Systematic Review

Alveolar ridge preservation of two‐wall bone defects using mineralized dentin matrix: An experimental pre‐clinical study

Coronectomy of lower third molars in intimate relation to the inferior alveolar nerve: A report of two cases

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