Does craniofacial morphology affect third molars impaction? Results from a population-based study in northeastern Germany

Kindler, Stefan; Ittermann, Till; Bülow, Robin; Holtfreter, Birte; Klausenitz, Catharina; Metelmann, Philine H.; Mksoud, Maria; Pink, Christiane; Seebauer, Christian; Kocher, Thomas; Koppe, Thomas; Krey, Karl-Friedrich; Metelmann, Hans‐Robert; Völzke, Henry; Daboul, Amro

doi:10.1371/journal.pone.0225444

Cited by 11 publications

(9 citation statements)

References 54 publications

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“…Another study reported that impacted mandibular 3rd molars were associated with decreased faciocranial height and increased cranial width. 8,36 This study has certain limitations. As mentioned earlier, if there had been a sufficient number of samples in the subgroups formed in Groups 1 and 2, we planned to conduct analyses in two main and four subgroups in total.…”

Section: Discussionmentioning

confidence: 94%

Effects of Third Molars on Anterior Crowding and Relapse After Orthodontic Treatment

KURT DEMİRSOY,

YILANCI,

ABAY

et al. 2023

neudentj

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Purpose: This study aimed to evaluate the effect of the absence or presence of third molars on the relapse of mandibular incisor crowding after orthodontic treatment and to determine the indication for prophylactic third molar extraction in orthodontic patients based on Ganss ratios. Material and Method: The study was conducted with the dental models, panoramic and lateral cephalometric radiographs, and intraoral and extraoral photographs of 42 patients (26 females, mean age 16.56±4.96 years; 16 males, mean age 17.52±4.39 years). Data were collected at three time points: before (T1), at the end of (T2), and at least 2 years after the end of orthodontic treatment (T3). The patients were divided into two groups: those with impacted or erupted third molars (Group 1, n=22) and those with agenesis or extracted third molars (Group 2, n=20). Panoramic radiographs were used to determine the presence or absence of third molars at the three time points and to calculate Ganss ratio (GR) (1). Dental models were scanned with the 3 Shape TRIOS oral scanner (3 Shape Co. Copenhagen, Denmark) and mandibular anterior crowding was assessed using Little’s Irregularity Index (LII) (2). Mann-Whitney U test was used to compare mandibular LII values between the groups. GR values of mandibular impacted third molars at T1-T3 were evaluated with repeated-measures ANOVA. Pearson correlation analysis was used to determine the correlation between LII and GR in Group 1. Statistical significance was set at P<0.05. Results: There was no statistically significant difference between the groups in terms of the relapse of mandibular anterior crowding and the presence or absence of mandibular third molars (P=0.940). In Group 1, GR increased significantly at T3 due to an increase in retromolar distance (P<0.05). There was no correlation between LII and GR in Group 1. Conclusion: The presence or absence of mandibular third molars did not affect the relapse of mandibular anterior crowding in orthodontic patients. Prophylactic third molar extraction after orthodontic treatment does not seem necessary.

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Section: Discussionmentioning

confidence: 94%

Effects of Third Molars on Anterior Crowding and Relapse After Orthodontic Treatment

KURT DEMİRSOY,

YILANCI,

ABAY

et al. 2023

neudentj

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“…Kindler et al [ 28 ] studied the effect of craniofacial morphology on erupted or impacted third molars using MRI. They found that an increased maximal cranial width has a higher risk for impaction of third molars in the mandible and in the maxilla, and that individuals with a lower total anterior facial height and lower facial index also are at an increased risk for third molars impaction in the mandible.…”

Section: Resultsmentioning

confidence: 99%

SHIP-MR and Radiology: 12 Years of Whole-Body Magnetic Resonance Imaging in a Single Center

et al. 2021

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The Study of Health in Pomerania (SHIP), a population-based study from a rural state in northeastern Germany with a relatively poor life expectancy, supplemented its comprehensive examination program in 2008 with whole-body MR imaging at 1.5 T (SHIP-MR). We reviewed more than 100 publications that used the SHIP-MR data and analyzed which sequences already produced fruitful scientific outputs and which manuscripts have been referenced frequently. Upon reviewing the publications about imaging sequences, those that used T1-weighted structured imaging of the brain and a gradient-echo sequence for R2* mapping obtained the highest scientific output; regarding specific body parts examined, most scientific publications focused on MR sequences involving the brain and the (upper) abdomen. We conclude that population-based MR imaging in cohort studies should define more precise goals when allocating imaging time. In addition, quality control measures might include recording the number and impact of published work, preferably on a bi-annual basis and starting 2 years after initiation of the study. Structured teaching courses may enhance the desired output in areas that appear underrepresented.

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“…However, this study was recently discredited due to the restricted sample size [ 8 ]. Impaction of the mandibular third molar seems to be associated with increased cranial width and decreased cranial facial height [ 34 ].…”

Section: Discussionmentioning

confidence: 99%

Presence and Maturation Dynamics of Mandibular Third Molars and Their Influence on Late Mandibular Incisor Crowding: A Longitudinal Study

Žigante

Pavlić

Morelato

et al. 2021

IJERPH

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The objective of this study was to investigate the relationship between the absence, presence and dynamics of mandibular third molar development and the occurrence and amount of late mandibular incisor crowding. Dental plaster casts and panoramic radiographs of 72 orthodontically untreated subjects from the Nittedal growth study, Norway were analyzed. The subjects were recalled for a checkup at 12, 15, 18 and 21 years of age. Mandibular incisor crowding was assessed using Little’s irregularity index and dental maturation of the third molars by the Cameriere’s index. The majority of the subjects (64%) had ≥1 mm increase in irregularity; 22% experienced an increase of 0.1–0.9 mm and 14% had unchanged or decreased irregularity. Incisor irregularity increased with age, regardless of absence or presence of third molars. The amount of change in incisor irregularity from 12 to 21 years did not differ significantly between subjects with hypodontia of third molars, extraction and those with third molars present. No differences were observed between erupted, unerupted or impacted third molars. No correlation was found between the amount of change in irregularity and maturation of the third molars. In conclusion, occurrence and amount of mandibular late incisor crowding is not significantly influenced by the presence of mandibular third molars or their development dynamics.

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Does craniofacial morphology affect third molars impaction? Results from a population-based study in northeastern Germany

Cited by 11 publications

References 54 publications

Effects of Third Molars on Anterior Crowding and Relapse After Orthodontic Treatment

Effects of Third Molars on Anterior Crowding and Relapse After Orthodontic Treatment

SHIP-MR and Radiology: 12 Years of Whole-Body Magnetic Resonance Imaging in a Single Center

Presence and Maturation Dynamics of Mandibular Third Molars and Their Influence on Late Mandibular Incisor Crowding: A Longitudinal Study

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