What kind of third molars are disease-free in a population aged 30 to 93 years?

Ventä, Irja; Vehkalahti, Miira M.; Suominen, Anna Liisa

doi:10.1007/s00784-018-2528-5

Cited by 14 publications

(13 citation statements)

References 15 publications

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“…Our findings showed that from the third molars in adults aged ≥30 years, 37.1% were impacted and 3.6% were horizontally located (Table ). Furthermore, our recent study on the same material documented that 39.6% of the mandibular third molars are located close to the mandibular canal . If these teeth require extraction, it would be easier in younger than in older persons.…”

Section: Discussionmentioning

confidence: 92%

Prevalence of third molars determined by panoramic radiographs in a population‐based survey of adult Finns

Ventä

Vehkalahti

Huumonen

et al. 2020

Comm Dent Oral Epid

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Objectives:The aim of the study was to examine the prevalence of third molars in panoramic radiographs in a population-based study of adults aged ≥30 years. Methods:Out of a sample of 8028 inhabitants of Finland, selected with two-staged stratified cluster-sampling method for the Health 2000 Survey, 5989 participated in clinical oral examination and panoramic radiography. Mean age was 52.5 years (SD 14.6; range 30-97 years). The following variables were included in the analysis: participant characteristics, clinical number of all teeth, and radiographic prevalence and characteristics of third molars. Statistics included chi-squared, Fisher's exact, and Kruskal-Wallis tests and SAS-SUDAAN calculations.Results: A total of 5912 third molars in 47.8% of the study population were recorded from panoramic radiographs. At least one impacted third molar was found in 21.9% of the study population. More than half (57.3%) of the remaining third molars were located in the mandible. A preponderance of participants with all third molars missing were observed in the oldest age group, women, those with lower education and those living in the countryside. Third molars or remnants thereof were observed radiographically in 3.9% of clinically edentulous study population. Conclusions:The panoramic radiographs disclosed many remaining third molars in adult Finns aged ≥30 years. One-third of the third molars located impacted which may cause unexpected need for care. K E Y W O R D Sadults, dental health, epidemiology

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Section: Discussionmentioning

confidence: 92%

Prevalence of third molars determined by panoramic radiographs in a population‐based survey of adult Finns

Ventä

Vehkalahti

Huumonen

et al. 2020

Comm Dent Oral Epid

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“…Staderini et al in their recent systematic review concluded that there was no sufficient evidence to define absolute indications or contraindications for preventive removal of impacted third molars [28]. Ventä et al found that the number of disease-free third molars decreased with increasing age, and most dramatically, this occurred among teeth at the cervical level with the neighboring second molar [29]. Only one-fourth of third molars may remain disease-free after the age of 30 years [29].…”

Section: Discussionmentioning

confidence: 99%

“…Ventä et al found that the number of disease-free third molars decreased with increasing age, and most dramatically, this occurred among teeth at the cervical level with the neighboring second molar [29]. Only one-fourth of third molars may remain disease-free after the age of 30 years [29]. It is also important not to forget that positional changes and eruption of ITM are an unpredictable phenomena [30].…”

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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“…Although the presence of M3s is generally believed to increase the residual periodontal pockets and caries risks of M2s [24,26,28], the decision on preventive extraction of asymptomatic M3s is hard for dentists and patients [17,29]. Even in most studies, the preventive extraction of M3s can be benefit for the health of neighboring M2s [11,13,14], in many clinical situations, asymptomatic M3s are indeed more likely retained until irreversible damages happen [15,16].…”

Section: Discussionmentioning

confidence: 99%

Loss of 908 Second Molars in Chinese adults: Consequences of the Presence of Their Neighboring Third Molars?

Sun¹,

Tian²,

Qu³

et al. 2020

Preprint

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Background Many studies have reported that the presence of third molars (M3s) can increase the risk of pathology in neighboring second molars (M2s). However, whether the presence of M3s can effect the mortality of M2s remains unknown. The main aim of this study was to reveal the reasons for M2 loss and how the M2 loss were related to their neighboring M3s. Methods This was a retrospective cross-sectional study. A review of the medical records and radiographic imagines of patients who had their M2(s) removed was undertaken to analyze the reasons for tooth extraction and how those reasons were related to the presence of M3s situated adjacent to the removed M2s. Results Clinical material (from January to March 2019) of 800 patients met the inclusion criteria were involved into this study. M2s in 908 quadrants (i.e. 908 M2s) were removed from these enrolled patients, wherein 382 quadrants were with the absence of M3s and the other 526 quadrants were with the presence of M3s. The average age of patients whose missing M2s had or had no neighboring M3s was 52.4 ± 14.8 years and 56.7 ± 14.9 years respectively (Mann-Whitney U test, p < 0.001). When the reasons for the 908 extracted M2s were traced, it was found that 433 teeth (47.7%) were removed due to caries and sequelae, while 300 teeth (33.0%) were lost for periodontal diseases. In addition, substantial evidence confirmed that 14.4% of the M2s with adjacent M3s were removed due to diseases mainly in the distal surface which were closely related to their neighboring M3s, and it was much higher than that was identified from removed M2s without adjacent M3s (1.8%). Except for residual roots, 42.2% M3s were removed along with neighboring M2s simultaneously. Conclusions The presence of M3s, no matter impacted or erupted M3s, was associated with an earlier loss of their neighboring M2s.

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What kind of third molars are disease-free in a population aged 30 to 93 years?

Abstract: Our results suggest that the number of disease-free third molars decreased with increasing age, and most dramatically, this occurred among teeth at cervical level with the neighboring second molar.

Cited by 14 publications

References 15 publications

Prevalence of third molars determined by panoramic radiographs in a population‐based survey of adult Finns

Prevalence of third molars determined by panoramic radiographs in a population‐based survey of adult Finns

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

Loss of 908 Second Molars in Chinese adults: Consequences of the Presence of Their Neighboring Third Molars?

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