Patterns of third molar impaction in a group of volunteers in Turkey

Mollaoğlu, Nur; Çetiner, Sedat; Güngör, Kıvanç

doi:10.1007/s00784-001-0144-1

Cited by 27 publications

(25 citation statements)

References 13 publications

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“…[6][7][8][9][10][11][12][13] Our results indicate that retromolar space and space/width ratio were significantly larger in the subgroup of erupted mandibular third molars (P , .001). Furthermore, significantly larger sizes of retromolar space and space/width ratio were observed in the adult rather than in the early adult subgroup of patients (P , .001).…”

Section: Discussionmentioning

confidence: 54%

“…During the past decades, extensive research has been conducted in this field because of the high rate of third molar impaction and controversial results regarding potential predictors. [6][7][8][9][10][11][12][13] The lower third molar eruption is a complex process that depends on several factors. For a long time, insufficient development of retromolar space has been considered to be the most important factor contributing to the high impaction rate of lower third molars.…”

Section: Introductionmentioning

confidence: 99%

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Radiographic assessment of lower third molar eruption in different anteroposterior skeletal patterns and age-related groups

Jakovljević

Lazic

Soldatović

et al. 2014

The Angle Orthodontist

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Objective: To analyze radiographic predictors for lower third molar eruption among subjects with different anteroposterior skeletal relations and of different age groups. Materials and Methods: In total, 300 lower third molars were recorded on diagnostic digital orthopantomograms (DPTs) and lateral cephalograms (LCs). The radiographs were grouped according to sagittal intermaxillary angle (ANB), subject age, and level of lower third molar eruption. The DPT was used to analyze retromolar space, mesiodistal crown width, space/width ratio, third and second molar angulation (a, c), third molar inclination (b), and gonion angle. The LC was used to determine ANB, angles of maxillar and mandibular prognathism (SNA, SNB), mandibular plane angle (SN/MP), and mandibular lengths. A logistic regression model was created using the statistically significant predictors. Results: The logistic regression analysis revealed a statistically significant impact of b angle and distance between gonion and gnathion (Go-Gn) on the level of lower third molar eruption (P , .001 and P , .015, respectively). The retromolar space was significantly increased in the adult subgroup for all skeletal classes. The lower third molar impaction rate was significantly higher in the adult subgroup with the Class II (62.3%) compared with Class III subjects (31.7%; P , .013). Conclusion:The most favorable values of linear and angular predictors of mandibular third molar eruption were measured in Class III subjects. For valid estimation of mandibular third molar eruption, certain linear and angular measures (b angle, Go-Gn), as well as the size of the retromolar space, need to be considered. (Angle Orthod. 2015;85:577-584.)

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Section: Discussionmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Radiographic assessment of lower third molar eruption in different anteroposterior skeletal patterns and age-related groups

Jakovljević

Lazic

Soldatović

et al. 2014

The Angle Orthodontist

View full text Add to dashboard Cite

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“…In addition, retromolar space/third molar crown width ratio was significantly smaller in the impacted group. 30 The protocol study has not taken into account the sexual dimorphism because the third molars behave differently to the other teeth; mature and erupt earlier in female subjects. Some authors concluded that the right and left mandibular molars have the same pattern of development and emergence and over the age of 18, no relevant differences were observed between sexes.…”

Section: Discussionmentioning

confidence: 99%

Comparison between two radiographic methods used for the prediction of mandibular third molar impaction

Torreira

Valladares-Durán

López-Ratón

2014

Revista Portuguesa de Estomatologia, Medicina Dentária e Cirurg

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a b s t r a c tObjectives: This study compares the validity of two different methods with linear and angular measurements (Olive-Basford's method and Olmos' method) used as predictive methods of mandibular third molar impaction.Methods: A long-term follow-up study analyzing measurements over dental panoramic radiographs in three consecutive times (at the time of baseline evaluation (t 1 ) and 3 (t 2 ) and 6 (t 3 ) years later) during six years was realized in 32 orthodontic patients. The discrimination accuracy in each time was evaluated by using the Receiver Operating Characteristic (ROC) curve. Results:The area under the ROC curve (AUC) in t 1 and t 2 was slightly higher in the Olmos' method, but there were no statistically significant differences between both methods (p = 0.483 and p = 0.552, respectively). However, in t 3 , significant differences were detected (p < 0.05), where the AUC for Olmos' method was 0.874 (95% CI: 0.788-0.959), showing a high discrimination capacity of this method. Conclusions: The Olmos' method improves the prediction of the third molar eruption, allowing a higher level of discrimination in clinical practice to identify the likelihood of impaction on panoramic radiographs. 208 r e v p o r t e s t o m a t o l m e d d e n t c i r m a x i l o f a c . 2 0 1 4;5 5(4):207-213 Comparação entre 2 métodos radiográficos diferentes usados para a previsão da impactação do terceiro molar mandibular Palavras-chave: Impactação dentária Terceiro molar inferior Radiografias panorâmicas Cefalometria Prognóstico r e s u m o Objetivos: Este estudo compara a validade de 2 métodos diferentes, com medidas lineares e angulares (método de Olive-Basford e método de Olmos) usados como métodos preditivos da impactação do terceiro molar mandibular. Métodos: Um estudo de seguimento analisa as mediç ões sobre radiografias panorâmicas em 3 vezes consecutivas (no momento da avaliação inicial [T1], 3 anos [T2] e 6 anos [T3]), durante 6 anos, realizado em 32 pacientes ortodônticos. A precisão da discriminação em cada tempo foi avaliada usando o Receiver Operating Characteristic (ROC).Resultados: A área sob a curva ROC (AUC) em T1 e T2 foi ligeiramente superior no método de Olmos, mas não houve diferenças estatisticamente significativas entre os 2 métodos (p = 0,483 e p = 0,552, respetivamente). Entretanto, em T3, foram detetadas diferenças significativas (p < 0,05) em que a AUC para o método de Olmos foi 0,874 (IC 95%: 0,788-0,959), que mostra uma alta capacidade de discriminação deste método.Conclusões: O método de Olmos demonstrou permitir uma maior capacidade de previsão de erupção do terceiro molar na prática clínica e da probabilidade de impactação através da análise de radiografias panorâmicas.

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“…Similarly, in this study, mesial inclination of the mandibular third molar and distal inclination of the maxillary third molar were found to be indicative of the tendency for these teeth to be impacted. Mollaoglu et al [18] reported that individuals with mesioangular tooth inclination had insufficient space in the retromolar region.…”

Section: Discussionmentioning

confidence: 99%

Is There a Possible Association between Skeletal Face Types and Third Molar Impaction? A Retrospective Radiographic Study

2018

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Objective: Third molar impaction is seen much more than impaction of any other tooth as they are the last teeth to erupt. Inadequate retromolar space and the direction of eruption may be contributing factors. The aim of this study was to investigate the relationship between third molar impaction and different skeletal face types. Subjects and Methods: Panoramic and lateral cephalometric radiographs of 158 orthodontic patients (aged 19–25 years) were retrieved from the archived records of the Necmettin Erbakan University Faculty of Dentistry, Konya, Turkey. Third molar impaction was classified on the basis of Winter’s classification. The skeletal facial type was determined by a measure of the angle created by the lines Ba-Na and Pt-Gn. The mean was 90 ± 2 and this value was regarded as mesofacial. An angle of > 93° was regarded as brachyfacial and an angle of < 87° as dolichofacial. Results: The overall presence of mandibular and maxillary third molar impactions was 65.2 and 38.6%, respectively. Although there was a statistically significant difference between different skeletal facial types and mandibular third molar impaction (p < 0.05), no statistically significant differences were observed between different skeletal facial types and maxillary third molar impaction (p > 0.05). Brachyfacials demonstrated a lower prevalence of third molar impaction than dolichofacials. Conclusions: Different skeletal face types were associated with mandibular third molar impaction. Brachyfacials, who have a greater horizontal facial growth pattern than dolichofacials, showed a lower prevalence of impacted mandibular third molars.

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Patterns of third molar impaction in a group of volunteers in Turkey

Cited by 27 publications

References 13 publications

Radiographic assessment of lower third molar eruption in different anteroposterior skeletal patterns and age-related groups

Radiographic assessment of lower third molar eruption in different anteroposterior skeletal patterns and age-related groups

Comparison between two radiographic methods used for the prediction of mandibular third molar impaction

Is There a Possible Association between Skeletal Face Types and Third Molar Impaction? A Retrospective Radiographic Study

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