Three-dimensional analysis of impacted maxillary third molars: A cone-beam computed tomographic study of the position and depth of impaction

Andrade, Priscila Ferreira de; Silva, Jesca Neftali Nogueira; Sotto-Maior, Bruno Salles; Ribeiro, Cleide Gisele; Devito, Karina Lopes; Assis, Neuza Maria Souza Picorelli

doi:10.5624/isd.2017.47.3.149

Cited by 18 publications

(15 citation statements)

References 15 publications

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“…One of the ERR risk factors discussed in the literature is patient age. Eruptive tooth movement does not stop after root formation is completed, and these teeth continue to exert mechanical pressure on adjacent second molars, thereby creating conditions for ERR progression [21]. Therefore, it can be assumed that the odds for ERR may increase with patient age.…”

Section: Discussionmentioning

confidence: 99%

Relationship between the Position of Impacted Third Molars and External Root Resorption of Adjacent Second Molars: A Retrospective CBCT Study

Smailienė

Trakiniené

Beinorienė³

et al. 2019

Medicina

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Background and objectives: Impacted third molars (ITM) are the most commonly-impacted teeth. There is a risk for ITM to cause a number of pathological conditions, and external root resorption (ERR) of adjacent teeth is one of the most prevalent. Retaining or prophylactic extraction of ITM is a polemic topic. External root resorption of adjacent teeth is one of possible indications for prophylactic removal of ITM. The aim of this study was to assess the relationship between external root resorption (ERR) on the distal aspect of second molars’ roots and positional parameters of ITM. Methods: Cone beam computed tomography scans of 109 patients (41 males, 68 females; mean age 26.4 ± 7.9 years) with 254 ITM (131 in the maxilla and 123 in the mandible) were retrospectively analyzed. Positional parameters of ITM (mesio-distal position, angulation, impaction depth, and available eruption space) were evaluated. The presence, location, and depth of ERR of adjacent second molars were assessed. Results: Analysis showed a relationship between ITM impaction depth, mesial inclination angle, and the presence of ERR. Mesial inclination angle of more than 13.6° increased the odds of ERR occurrence by 5.439 (95% CI, 2.97–9.98). ITM presence at the level of ½ of roots of the adjacent second molar or more apically increased the odds of ERR occurrence by 2.218 (95% CI, 1.215–4.048). No significant correlation was detected between the occurrence of ERR and patient age, gender, or the available eruption space in the mandible. Depth of ERR did not depend on its location. Conclusions: Incidence of ERR in second molars is significantly associated with mesial inclination and a deep position of ITM.

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Section: Discussionmentioning

confidence: 99%

Relationship between the Position of Impacted Third Molars and External Root Resorption of Adjacent Second Molars: A Retrospective CBCT Study

Smailienė

Trakiniené

Beinorienė³

et al. 2019

Medicina

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“…Studies on interobserver reproducibility regarding the maxillary third molar seen in PAN and CBCT are non-existing since the studies either did not mention the number of observers or reported only results made in consensus, and interobserver reproducibility was not calculated. [8][9][10][11][12] On the other hand, studies on assessment of pathology related to the mandibular third molar are available in the literature. [19][20][21][22][23] In a previous study assessing resorption in PAN and CBCT of mandibular third molars, the average percentage of observer accordance was 83% for PAN and 72% in CBCT among four observers.…”

Section: Observer Reproducibility Of Pan and Cbctmentioning

confidence: 99%

“…Studies currently available on the use of CBCT for maxillary third molars have reached F&T-level 2 and 3 according to the hierarchical model of efficacy assessing the accuracy of the method. [8][9][10][11][12] Previous studies at Level 2 investigated the angulation and impaction depth of impacted maxillary third molars in both PAN and CBCT. 8,9 Both studies found that buccal inclination was the most common position in the transversal plane.…”

Section: Introductionmentioning

confidence: 99%

“…[8][9][10][11][12] Previous studies at Level 2 investigated the angulation and impaction depth of impacted maxillary third molars in both PAN and CBCT. 8,9 Both studies found that buccal inclination was the most common position in the transversal plane. Additionally, one of the studies 9 stated that the vertical position was the most frequent position in the sagittal plane whereas the other study 8 found that the distal position was the most common.…”

Section: Introductionmentioning

confidence: 99%

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Marginal bone loss and resorption of second molars related to maxillary third molars in panoramic images compared with CBCT

Hermann

Wenzel

Schropp

et al. 2019

Dentomaxillofacial Radiology

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Objectives: Compare findings among observers in panoramic images (PAN) and cone beam CT (CBCT); and assess findings in PAN as indicators for marginal bone loss and resorption observed in CBCT. Methods: 120 impacted maxillary third molars with PAN and CBCT were included. Four observers assessed morphological features: (1) tooth angulation; (2) number of roots; (3) bony impaction (yes/no) and pathology; (4) marginal bone level at the second molar (normal/>3 mm = bone loss); (5) resorption in the second molar (no/superficial/< half way through the dentin/≥ half way through the dentin/involving the pulp); (6) size of follicular space (normal/> 4 mm(cyst)). Percentage accordance and κ statistics described observer variation in PAN and CBCT. Logistic regression analyses tested findings in PAN as indicators for marginal bone loss or resorption observed in CBCT. Results: κ values were fair and interobserver accordance was marginally higher in CBCT than PAN. Agreement between PAN and CBCT was 81-88% for marginal bone loss and 68-81% for resorption. Severe resorption was more often observed in CBCT. Mesio-angulated third molars and marginal bone loss interpreted in PAN significantly indicated marginal bone loss observed in CBCT (odds ration 17-34; p < 0.012; 8.8-52.8; p < 0.02). In contrast, findings in PAN were not significant indicators for resorption observed in CBCT (p > 0.05). conclusion: In general, there was a fair agreement for marginal bone loss between PAN and CBCT, and PAN could significantly predict bone loss observed in CBCT. However, presence of resorption observed in CBCT could not be determined from PAN, and more severe resorption was observed in CBCT. CBCT is indicated if resorption in the second molar needs to be assessed.

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“…No postoperative complications including infection or injury of the IAN or lingual nerve were reported. The demographic data of the patients and the results of analyzing the in uencing factors based on the status and radiographic signs of the mandibular M3 and the distribution of cases are presented in Table 1 [23][24][25].…”

Section: Resultsmentioning

confidence: 99%

Factors affecting root migration after coronectomy of the mandibular third molar

Lee

Jung

Park

et al. 2020

Preprint

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Background The purpose of this study was to analyze root migration and its influencing factors at 6 months after coronectomy in both two- and three-dimensions using periapical view and cone-beam computed tomography (CBCT). Methods Thrity-three cases of root remnant after coronectomy were included and analyzed. We measured the amount of migration in CBCT. The following factors that could possibly affect root migration were also analyzed: age, gender, number of mandibular third molar (M3) roots, shape of M3s, Pell and Gregory classification, mesiodistal (MD) angulation, buccolingual (BL) angulation, contact point with the second molar, root curvature, and complete removal of the coronal portion. Results Migration of greater than 2 mm was found in 64% of the roots in the 2D analysis, and the average root migration was 4.11 mm in the 3D analysis. The factors affecting migration were the root morphology, complete removal of the coronal portion, impaction depth, and MD angulation in the 2D analysis, and MD and BL angulation in the 3D analysis. Conclusion In conclusion, complete removal of the coronal portion and ensuring sufficient space for root migration might be important factors after coronectomy of the M3. Clinical relevance Root remnant after coronectomy of M3 may migrate in young patients who has sufficient empty coronal space and this may reduce the nerve damage by the separation of IAN and M3.

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Three-dimensional analysis of impacted maxillary third molars: A cone-beam computed tomographic study of the position and depth of impaction

Cited by 18 publications

References 15 publications

Relationship between the Position of Impacted Third Molars and External Root Resorption of Adjacent Second Molars: A Retrospective CBCT Study

Relationship between the Position of Impacted Third Molars and External Root Resorption of Adjacent Second Molars: A Retrospective CBCT Study

Marginal bone loss and resorption of second molars related to maxillary third molars in panoramic images compared with CBCT

Factors affecting root migration after coronectomy of the mandibular third molar

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