External root resorption of the second molar associated with mesially and horizontally impacted mandibular third molar: evidence from cone beam computed tomography

Wang, Dongmiao; He, Xiaotong; Wang, Yanling; Li, Zhongwu; Zhu, Yumin; Sun, Chao; Ye, Jinhai; Jiang, Hongbing; Cheng, Jie

doi:10.1007/s00784-016-1888-y

Cited by 61 publications

(88 citation statements)

References 28 publications

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“…Risk factors (patient's age and impaction depth) for external root resorption have been evaluated 26 but gender was not evaluated. The finding of this study showed gender had no influence on occurrence of external root resorption on the adjacent second molar.…”

Section: Discussionmentioning

confidence: 99%

Gender Variation in Pattern of Mandibular Third Molar Impaction

Enabulele¹

2017

JDODT

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tion system was adapted to classify occupation into five (5) socioeconomic groups: Professionals and managerial officers and retirees of this type (e.g. doctors, lawyers), skilled workers (e.g. teachers, nurses), semi-skilled workers (e.g. artisans), unskilled workers (e.g. traders) and dependants (students and other unemployed individuals).Inclusion criteria were all consenting patients with at least one impacted mandibular third indicated for extraction. Informed consent was obtained from all the participants. Ethical approval was obtained from the Ethics and Research Committee of the College of Medical Sciences, University of Benin before commencement of the study.Periapical radiographs of the impacted mandibular third molars were exposed using the long cone paralleling technique and a digital probe to enable classification of the type of impaction and any other radiographic findings. The long cone paralleling technique was used for this study due to the fact that it is regarded as the technique of choice following its reduced radiation dose; less magnification and demonstration of the true relationship between the bone height and adjacent teeth [10].The impacted mandibular third molars were classified using the winter's classification based on the inclination of the long axis of the impacted third molar to the long axis of the second molar. The tooth was classified as mesio-angular when the impacted third molar is tilted towards the second molar in a mesial direction; disto-angular when the long axis of the impacted third molar is angled distally / posteriorly away from the second molar; horizontal when the long axis of the impacted third molar is horizontal and vertical when the long axis of the impacted third molar is parallel to the long axis of the second molar [11].The impacted mandibular third molars were also classified as partial impaction when the superficial portion of the tooth was covered only by soft tissue but the height of the tooth's contour was below the level of the surrounding alveolar bone and complete impaction when the tooth was completely encased in bone so that when the gingival is cut and reflected back, the tooth is not seen [12]. MethodologyThis was a prospective cross sectional study involving patients presenting with impacted mandibular third molars to the Dental Centre of the University of Benin Teaching Hospital.The data collection instrument was a pre-tested interviewer administered questionnaire. The questionnaire elicited information on demographic characteristics, number and type of impacted mandibular third molar, caries and cervical resorption status of the adjacent second molar and symptoms associated with the impacted mandibular third molar. The standard International Lab our occupational classifica- AbstractA tooth is said to be impacted when it is obstructed on its path of eruption with the most commonly impacted tooth being the third molar. Various factors have been reported to cause obstruction in the path of eruption of the third molar and these include adjacent to...

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Section: Discussionmentioning

confidence: 99%

Gender Variation in Pattern of Mandibular Third Molar Impaction

Enabulele¹

2017

JDODT

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“…The category of impaction of each tooth was identified with presurgical panoramic radiography and/or CBCT scans, and recorded based on Winter’s classifications as described before328. Furthermore, the patient exclusion criteria were listed as follows: 1) the impacted mandibular third molars associated with cystic or tumor lesions, 2) the teeth with less than two thirds of root developed, 3) the teeth showing extensive carious lesion, 4) the adjacent second molars which were extracted or impacted simultaneously, 5) oral surgical procedures involved in the mandibular third molar region, 6) historical or ongoing orthodontic treatments, 7) the poor quality of CBCT images which jeopardized unambiguous view of local anatomy and structures.…”

Section: Methodsmentioning

confidence: 99%

“…These impacted teeth usually result in diverse types of pathological conditions including reiterative pericoronitis, swelling, odontogenic cysts or tumors, bone loss as well as root resorption of the adjacent teeth, thus inevitably leading to impaired oral functions and discomfort123. The extraction of impacted mandibular third molar is one of the most common surgical procedures in the dental clinic and outpatient department of oral and maxillofacial surgery.…”

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confidence: 99%

Topographic relationship between root apex of mesially and horizontally impacted mandibular third molar and lingual plate: cross-sectional analysis using CBCT

Wang

et al. 2016

Sci Rep

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The present study was aimed to determine the topographic relationship between root apex of the mesially and horizontally impacted mandibular third molar and lingual plate of mandible. The original cone beam computed tomography (CBCT) data of 364 teeth from 223 patients were retrospectively collected and analyzed. The topographic relationship between root apex and lingual plate on cross-sectional CBCT images was classified as non-contact (99), contact (145) and perforation (120). The cross-sectional morphology of lingual plate at the level of root apex was defined as parallel (28), undercut (38), slanted (29) and round (4). The distribution of topographic relationship between root apex and lingual plate significantly associated with gender, impaction depth, root number and lingual plate morphology. Moreover, the average bone thickness of lingual cortex and distance between root apex and the outer surface of lingual plate were 1.02 and 1.39 mm, respectively. Furthermore, multivariate regression analyses identified impaction depth and lingual plate morphology as the risk factors for the contact and perforation subtypes between root apex and lingual plate. Collectively, our findings reveal the topographic proximity of root apex of impacted mandibular third molar to the lingual plate, which might be associated with intraoperative and postoperative complications during tooth extraction.

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“…Occasionally, it is necessary to remove the tooth in order to avoid other problems such as pericoronitis, swelling, odontogenic cysts or tumors, bone loss and external root resorption (ERR) of the adjacent second molar. 1 However, the decision of extracting or maintaining a third molar is controversial. 2 If an impacted third molar is not extracted after a certain stage of its formation, it may contribute to second molar ERR.…”

Section: Introductionmentioning

confidence: 99%

“…2 If an impacted third molar is not extracted after a certain stage of its formation, it may contribute to second molar ERR. 1 According to Tsesis et al 3 ERR is a pathological process that occurs at the permanent tooth outer surface and it may be induced by pulpal infection or periodontal inflammation related causes, or pressure associated with orthodontic movements, impacted tooth or pathoses. Periapical and panoramic radiographies (PR) are the standard imaging modalities for determining third molar characteristics.…”

Section: Introductionmentioning

confidence: 99%

Comparison between panoramic radiography and CBCT imaging on the diagnosis of second molar external root resorption associated with an impacted mandibular third molar: two case reports

Velasco¹,

Santos²,

Salineiro³

et al. 2018

JDHODT

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Comparison between panoramic radiography and CBCT imaging on the diagnosis of second molar external root resorption associated with an impacted mandibular third molar: two case reports Submit Manuscript | http://medcraveonline.com IntroductionThird molar impaction is a usual condition found at the dental practice. Occasionally, it is necessary to remove the tooth in order to avoid other problems such as pericoronitis, swelling, odontogenic cysts or tumors, bone loss and external root resorption (ERR) of the adjacent second molar.1 However, the decision of extracting or maintaining a third molar is controversial.2 If an impacted third molar is not extracted after a certain stage of its formation, it may contribute to second molar ERR.1 According to Tsesis et al. 3 ERR is a pathological process that occurs at the permanent tooth outer surface and it may be induced by pulpal infection or periodontal inflammation related causes, or pressure associated with orthodontic movements, impacted tooth or pathoses. Periapical and panoramic radiographies (PR) are the standard imaging modalities for determining third molar characteristics. These imaging exams are readily available and dental professionals are acquainted with images interpretation. However, they are two-dimensional images, thus impairing a more detailed analysis of the region. Additionally, panoramic radiographies (PR) present a certain degree of distortion. 4 The limitation generated by the absence of a third dimension resulted in methods that do not inform precisely the actual location of the third molar, its anatomy or its relationship with adjacent structures. 4 Cone beam computed tomography (CBCT) imaging allows a tridimensional evaluation of teeth and their adjacent anatomical structures, 4 resulting in a detailed visualization of the third molar as well as its neighboring structures, and subsequently, a meticulous diagnosis of ERR. CBCT is widely recommended for third molar surgical removal planning. 4 Among the advantages of this imaging modality, some authors mention spatial resolution, multiplanar reconstruction simultaneous analyses and structures superimposition avoidance.5 Hence, the aim of this study was to report two cases of mandibular impacted third molar associated with second molar external root resorption, comparing panoramic radiography and CBCT imaging. Case reportsCase 1: A 24 year-old Caucasian male patient was submitted to a follow-up PR nine months after the extraction of tooth 38. The radiologist observed a severely inclined, mesialized and impacted 48. Its roots were contiguous to the mandibular canal roof and it was possible to recognize a severe dilaceration at the mesial root apex. Tooth 47 was endodontically treated and an overlap was noted between 48 crown and dental follicle, and 47 distal root ( Figure 1A). Tooth 48 was recommended for extraction and a CBCT was requested for planning the surgical intervention. The patient was submitted to a CBCT exam with the following characteristics: field of view (FOV) 5.0 cm by 5.5 cm, v...

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External root resorption of the second molar associated with mesially and horizontally impacted mandibular third molar: evidence from cone beam computed tomography

Abstract: Given the possibility of ERR associated with third molar impaction, the prophylactic removal of these impacted teeth could be considered especially for those patients with over 35 years and mesially and horizontally impacted teeth.

Cited by 61 publications

References 28 publications

Gender Variation in Pattern of Mandibular Third Molar Impaction

Gender Variation in Pattern of Mandibular Third Molar Impaction

Topographic relationship between root apex of mesially and horizontally impacted mandibular third molar and lingual plate: cross-sectional analysis using CBCT

Comparison between panoramic radiography and CBCT imaging on the diagnosis of second molar external root resorption associated with an impacted mandibular third molar: two case reports

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