Position Of Impacted Third Molars Research Articles

Retrospective analysis of the effects of impacted third molar on hematologic patients undergoing hematopoietic stem cell transplantation

ObjectiveThis study aimed to investigate the incidence, treatment status, and impact position of impacted third molars (ITM) and their effects on patients undergoing hematopoietic stem cell transplantation (HSCT). MethodsA retrospective analysis was conducted on the medical records of 454 patients who underwent HSCT, out of which 188 patients had ITM. The presence of ITM and its association with transplant-related infections and complications were recorded and analyzed. ResultsPatients with ITM were significantly younger. The number of mandibular ITM was notably higher than maxillary ones, and the risk of pericoronitis in mandibular ITM was significantly higher than in maxillary ones. Out of 311 ITM in 188 patients, 25 were extracted before transplantation. The proportion of extraction and treatment for ITM with pericoronitis or caries was significantly higher than that for ITM without such problems. Moreover, patients with a history of pre-transplant pericoronitis had a significantly higher probability of developing tooth-related complications during transplantation, caused by pericoronitis in ITM compared to patients without a history of pericoronitis. ConclusionPre-transplant examination and treatment of ITM are essential, especially in cases with a history of pericoronitis. Oral intervention can significantly reduce the occurrence of tooth-related complications related to ITM during transplantation.

Can the Position of the Impacted Third Molars Be an Early Risk Indicator of Pathological Conditions? A Retrospective Cone-Beam Computed Tomography Study.

The aim of this retrospective study was to evaluate the prevalence of pathologies associated with impacted third molars in relation to tooth position on cone-beam computed tomography images. In 348 cone-beam computed tomography images, the position of 640 impacted third molars (mesiodistal angulation, buccolingual inclination, impaction depth, and contact point localization) and the presence of pathologies (distal caries, external root resorption, marginal bone loss, and pathological follicular space) were evaluated. The data were analysed statistically with a significance level set at P < 0.05. Distal caries was mostly detected in relation to Class A (20.4%) and contact point at (12.5%) and above (10.5%) the cementoenamel junction (CEJ) (P = 0.000; P < 0.05). External root resorption and marginal bone loss were more common in mesioangular angulation (52.3% and 80.1%, respectively), Class C (53% and 73.8%, respectively), and contact point below the CEJ (53.2% and 73.3%, respectively) (P = 0.000; P < 0.05). Lingual inclination was identified as a new risk factor for associated pathologies (P < 0.05). Pathological follicular space was significantly more likely to occur in those with inverted angulation (100%) and absence of contact (31.5%) (P = 0.000 and P = 0.010, respectively; P < 0.05). Pathologies arising in second molars in relation to impacted third molars are significantly associated with the three-dimensional position of impacted third molars, and watchful monitoring or prophylactic removal of impacted third molars should be considered, taking into account the relevant risk parameters for the related pathologies.

Evaluation of Prevalence and Quality of Root Resorption of Second Molar Adjacent the Impacted Third Molar in Cone-Beam Computed Tomography

Introduction: Impacted third molar reduces the bone level in the distal aspect of second molar, and sometimes it can lead to external root resorption of the adjacent second molar. The aim of this study was to evaluate the prevalence and quality of this resorption using cone-beam computed tomography scanning.&#x0D; Materials &amp; Methods: In this descriptive study, CBCT images selected from 60 patients (including 107 maxillary &amp; mandibular impacted third molars) were obtained from patients referring to maxillofacial radiology department of dental faculty of Islamic Azad University of Isfahan (Khorasgan) in 2016. Under observation of oral radiologist, the images were examined (two times with one-week interval) in axial, coronal, and sagittal sections and recorded to diagnose external root resorption in CBCT. The data were analyzed via descriptive statistics including contingency tables and relative abundance.&#x0D; Results: The prevalence of external root resorption of second molar, adjacent to the third molar were 43.25%. The most common type of third molar impaction were mesioangular third molars (41.1%) and in the next level were the vertical (28.1%), and distoangular (18.7) and then horizontal (12.1). The most common location of resorption in mandibular second molar teeth was in 1/3 of cervical (62.5%), and then 1/3 of apical (20.8%) and 1/3 of the middle (12.5%). Also one of teeth resorptions (4.2%) was between the 1/3 of apical and 1/3 of the middle. The most common site of resorption in maxillary second molar teeth was at 1/3 of the apical (68.45%), and then at the 1/3 of the middle (17.35%) and 1/3 of cervical (8.7%). With regards to the severity of resorption; 78.96% of resorptions were mild, 12.03% severe, and 9.03 were moderate.&#x0D; Conclusion: The prevalence of this type of resorption is almost high and the most common position of impacted third molars that resulted in this type of resorption are mesioangular and horizontal. Most common site of resorption in the maxilla was 1.3 of the apical and in the mandible was 1.3 of the cervical, which were often mild in resorption.

Impact of Mesioangular Mandibular Impacted 3rd Molar on Peridontal Health of Adjacent Tooth

Objective: The aim of this study is to determine the impact of mesioangular mandibular 3rd molar impaction on periodontal health of adjacent tooth in patients. Study Design: Retrospective/observational study Place and Duration: Department of Oral &amp; Maxillofacial Surgery, MMDC Multan, during from Oct 2020 to September 2021. Methods: Total of seventy patients of both genders was presented in this study. Detailed demographic data of enrolled cases age, sex, body mass index, symptoms and complications were recorded after taking informed written consent. All the patients had mesioangular impactions of mandibular third molars. The impaction depth, relationship with ramus, and angulation of 70 IMTMs and their association with 2nd molar distal caries and root resorption, pathological states, and closeness to the mandibular canal were assessed on panoramic radiographs. Pell and Gregory classification was used to determine position of impacted third molar. The odds ratio (OR) and 95% confidence interval (CI) of IMTM's position on the related complications (credible interval for Bayesian models). Statistical significance was defined as a two-tailed p-value 0.05. SPSS 24.0 version was used to analyze complete data. Results: There were 42 (60%) males and 28 (40%) females with mean BMI 23.13±6.46 kg/m2. Most of patients 31 (44.3%) were aged between 20-35 years. Mean attachment level was 3.03±2.34 and probing depth was 3.34±3.35. Caries, pain and swelling were the most common symptoms found among cases. Distal second molar root caries 21 (30%) and pocket formation 17(24.3%) were the most common pathologies. As per histological findings periapical inflammation was majority found in 37 (52.9%) cases followed by dental follicle in 19 (27.1%) and cyst in 11 (15.7%). Conclusion: In this study, we found that the impacted mandibular third molar was most linked with distal second molar root caries and the creation of a pocket between the impacted tooth and the second molar tooth. The most common pathology associated with the impacted molar was distal second molar root caries and the creation of a pocket between the affected tooth and the second molar. Keywords: Mesioangular, Impacted mandibular third molar, Pathology, Complication

Impacted Third Molars and Its Propensity to stimulate External Root Resorption in Second Molars: Comparison of Orthopantomogram and Cone Beam Computed Tomography

ABSTRACTAimThis study was designed to compare the efficiency of conebeam computed tomography (CBCT) with panoramic radiography to discern external root resorption (ERR) in second molars.Materials and methodsThis was a retrospective study with a sample size of 50 participants who had a total of 120 impacted third molars visible on panoramic radiographs and CBCT images. The presence of ERR on the neighboring second molar was assessed and the position of impacted third molar was determined using Pell and Gregory classification. The ERR was registered according to Al-Khateeb and Bataineh's criteria. The location and severity were assessed by Ericson et al criteria, and grading of ERR was done as per the criteria given by Nemcovsky.ResultsThe CBCT was able to locate and identify extremely large number of cases with ERR on second molars in comparison with the panoramic radiographs. Based on Pell and Gregory classification, position B was most common. The ERR on second molars was most commonly seen at the cervical region. Most of the cases had mild severity. As per grading mentioned by Nemcovsky, maximum number of cases were given grade A followed by grade B.ConclusionAccording to our study and considering the threedimensional information obtained from CBCT, we found that ERR was better detected with CBCT.Clinical significanceIf on panoramic radiographs, a close contact is detected between the second molar and an impacted third molar, CBCT can be advised taking into account the “risk vs reward ratio.”How to cite this articleD'Costa ZV, Ahmed J, Ongole R, Shenoy N, Denny C, Binnal A. Impacted Third Molars and Its Propensity to stimulate External Root Resorption in Second Molars: Comparison of Orthopantomogram and Cone Beam Computed Tomography. World J Dent 2017;8(4):281-287.

Incidence of impacted third molars: A radiographic study in People's Hospital, Bhopal, India

ObjectivesThe aim of this study is to evaluate the position of impacted third molars based on the classifications of Pell & Gregory and Winter in a sample of Bhopal patients. Study designIn this retrospective study, up to 1100 orthopantomograms (OPG) of the patients who were reported to the MaxilloFacial Department of PDA and Chowdhary hospital from January 2011 to December 2012 were evaluated. ResultsAmong 1100 patients, 730 were male and 370 were female patients. Of the 1100 OPGs studied, 3,910 third molars were noticed either impacted or erupted and 490 third molars were missing. The most common angulation of impaction in the mandible was in vertical position (41.4%) followed by mesioangular impaction (33.3%) and the most common angulation of impaction in the maxilla was the vertical (67.4%) which was followed by 15.2% in distoangular impaction.The level of eruption of impacted third molar was found to be 43.9% at level A, 34.8% at level B and 21.3% at level C. There was no significant difference between the right and left sides in both the jaws. ConclusionThe pattern of third molar impaction in the region of Bhopal is characterized by a high prevalence of impaction, especially in the mandible. The most common angulation was the vertical in the mandible as well as in the maxilla. The most common level of impaction in mandible was level A and in maxilla is level C and there was no any significant difference between the right and left sides in both jaws.

Prevalence and type of pathological conditions associated with unerupted and retained third molars in the Western Indian population

Aim: The aim of this retrospective study was to assess the position of impacted third molars and to determine the prevalence and type of pathological conditions associated with these unerupted and retained teeth in the Western Indian population. Materials and Methods: A total of 5486 impacted third molars of 4133 patients were studied through the panoramic radiographs and clinical records to determine the position of the impacted third molars and for the presence of associated pathology. The ages of the patients ranged from 17 years to 67 years, with a mean of 33.7 years. The ratio of male to female patients was 1.8:1. The ratio of maxillary to mandibular molars was 1:1.6. Results: Pericoronitis was the most common associated pathology with the third molars (38.9%), followed by dental caries seen in 13.2% of the impacted teeth. Cystic and neoplastic changes were seen around 3.6% impacted teeth and 5.3% adjacent second molars had caries. Other pathologies were less frequent. Conclusion: The prevalence of pathological conditions associated with the third molar in the Western Indian population was 69.73%. Pericoronitis and caries were commonly seen in relation to the impacted third molars, whereas cystic pathology and root resorption were rarely observed. The fact that a considerable number of patients were asymptomatic indicating pathology is certainly worth considering.

Incidence of impacted mandibular and maxillary third molars-a radiographic study in a Southeast Iran population

Objectives: The aim of this study is to evaluate the position of impacted third molars based on the classifications of Pell & Gregory and Winter in a sample of Iranian patients. Study design: In this retrospective study, up to 1020 orthopantomograms (OPG) of the patients who were referred to the radiology clinics from October 2007 to January 2011 were evaluated. Data including the age, gender, the angulation type, width and depth of impaction were evaluated by statistical tests. Results: Among 1020 patients, 380(27.3%) were male and 640(62.7%) were female with the sex ratio was 1:1.7. Of the 1020 OPGs, 585 cases showed at least one impacted third molar, with significant difference between males (205; 35.1%) and females (380; 64.9%) (P = 0.0311). Data analysis showed that impacted third molars were 1.9 times more likely to occur in the mandible than in the maxilla (P =0.000). The most common angulation of impaction in the mandible was mesioangular impaction (48.3%) and the most common angulation of impaction in the maxilla was the vertical (45.3%). Impaction in the level IIA was the most common in both maxilla and mandible. There was no significant diffe-rence between the right and left sides in both the maxilla and the mandible. Conclusion: The pattern of third molar impaction in the southeast region of Iran is characterized by a high prevalence of impaction, especially in the mandible. Female more than male have teeth impaction. The most common angulation was the mesioangular in the mandible, and the vertical angulation in the maxilla. The most common level of impaction was the A and there was no any significant difference between the right and left sides in both jaws. Key words:Third molar, impaction, incidence, Iran.