Effects of early loss of permanent first molars on the development of third molars

Yavuz, İbrahim; Baydaş, Bülent; Íkbal, Aysegül; Dağsuyu, İlhan Metin; Ceylan, İsmail

doi:10.1016/j.ajodo.2005.02.026

Cited by 51 publications

(38 citation statements)

References 12 publications

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“…6 The closer the position of the extracted tooth to the maxillary third molar, the more influential will be the extraction on the M3 development. 17 In this context, molar extraction protocols may produce more favorable conditions for M3 uprighting than do premolar extractions. Nevertheless, the available eruption space may be drastically reduced during orthodontic management of severe Class II malocclusion and crowded cases.…”

Section: Discussionmentioning

confidence: 99%

Influence of unilateral maxillary first molar extraction treatment on second and third molar inclination in Class II subdivision patients

Livas

Pandis

Booij

et al. 2015

The Angle Orthodontist

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Objective: To assess the maxillary second molar (M2) and third molar (M3) inclination following orthodontic treatment of Class II subdivision malocclusion with unilateral maxillary first molar (M1) extraction. Materials and Methods: Panoramic radiographs of 21 Class II subdivision adolescents (eight boys, 13 girls; mean age, 12.8 years; standard deviation, 1.7 years) before treatment, after treatment with extraction of one maxillary first molar and Begg appliances and after at least 1.8 years in retention were retrospectively collected from a private practice. M2 and M3 inclination angles (M2/ITP, M2/IOP, M3/ITP, M3/IOP), constructed by intertuberosity (ITP) and interorbital planes (IOP), were calculated for the extracted and nonextracted segments. Random effects regression analysis was performed to evaluate the effect on the molar angulation of extraction, time, and gender after adjusting for baseline measurements. Results: Time and extraction status were significant predictors for M2 angulation. M2/ITP and M2/ IOP decreased by 4.04 (95% confidence interval [CI]: 26.93, 1.16; P 5 .001) and 3.67 (95% CI: 26.76, 20.58; P 5 .020) in the extraction group compared to the nonextraction group after adjusting for time and gender. The adjusted analysis showed that extraction was the only predictor for M3 angulation that reached statistical significance. M3 mesial inclination increased by 7.38u (95% CI: 211.2, 23.54; P , .001) and 7.33u (95% CI: 211.48, 23.19; P 5 .001). Conclusions: M2 and M3 uprighting significantly improved in the extraction side after orthodontic treatment with unilateral maxillary M1 extraction. There was a significant increase in mesial tipping of maxillary second molar crowns over time. (Angle Orthod. 2016;86:94-100.)

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Section: Discussionmentioning

confidence: 99%

Influence of unilateral maxillary first molar extraction treatment on second and third molar inclination in Class II subdivision patients

Livas

Pandis

Booij

et al. 2015

The Angle Orthodontist

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“…The development and eruption of the third molar presents varies greatly. It normally begins its development at about 8-9 years of age, but can occur between 5 and 14 years of age (5)(6)(7), and emerges in the oral cavity at around 18-24 years of age, although just as with its development, this can vary considerably (6,(8)(9)(10)(11). The third molar is the tooth that is most often impacted, impaction being more frequent in the mandibula than in the maxilla, varying between 9.5% and 39% (9-12), and may increase in patients who have been orthodontically treated to up to 50% (12).…”

Section: Introductionmentioning

confidence: 99%

“…• Delays in development of facial structure (9). Some studies in the literature associate extractionist therapy with a mesialization of the mandibular molars (17)(18)(19) and with an increase in the retromolar space (13,(17)(18)(19)(20)(21)(22), whereas the non-extractionist associates extraction with a significant increase in the frequency of mandibular third molar impaction (22) and a reduction in its eruption (14,18), although there are others who find very little difference between subjects treated with or without extractions (14).…”

Section: Introductionmentioning

confidence: 99%

Influence of first and second premolar extraction or non-extraction treatments on mandibular third molar angulation and position. A comparative study

Tarazona¹,

Paredes²,

Llamas³

et al. 2010

Med Oral

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The mandibular third molar (3M) is the tooth that is most often impacted, with lack of space being one of the reasons. In some orthodontic treatments, premolars are extracted in order to create space. The aims of our study are: firstly, to assess the changes in the angulation and position of the 3M in cases treated either with or without extraction of the first or second premolars; secondly, to analyse the variation in the gonial angle and the degree of inclusion of the 3M; and lastly, to establish a predictive impaction model for 3M. This study included 88 patients: 28 patients treated with extractions of first premolars, 30 with second premolars and 30 without. The initial and final orthopantomography was analysed and the angulation of the 3M was measured, a new variable being created to determine the degree of 3M inclusion in the mandibular ramus. The results show that the angulation of 3M improves with time, regardless of treatment, and presents a greater disinclusion in cases treated with extractions. The gonial angle tends to diminish with age in all cases. The conclusions suggest that other factors may influence the angulation and position of 3M and that it is not possible to establish a predictive impaction model.

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“…8,9 Other findings relate to the provision of additional space through the extraction of teeth within the arch: third molars in the earlier stages of development at the time of extraction of adjacent second molars are likely to take longer to erupt, 11 and development of the mandibular third molar was accelerated on the side on which the first molar was extracted. 12,13 Confounding the evaluation of available space in comparison to other permanent teeth is the potential for mandibular growth to affect arch size. Space availability is related to presently existing space, later resorption of the anterior ramus with growth, and actual size of the mandible.…”

Section: Introductionmentioning

confidence: 99%

Association between mandibular third molar formation and retromolar space

Ghougassian

Ghafari

2014

The Angle Orthodontist

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Objective: To assess the association between formation stages of the mandibular third molars and the space distal to the permanent molars (retromolar space). Materials and Methods: The material included pretreatment lateral cephalographs of 96 orthodontic patients (49 males, 47 females; 8-18 years old). The molar formation stage was assessed through the method of Nolla, which rates the degree of calcification on a scale of 10 stages. The retromolar space was measured from the most concave point of the anterior border of the ramus to the distal surface of the first molar (used because the second molars had not yet erupted in the younger patients). Statistical analyses included t-tests and analyses of variance for group differences and the Pearson product moment to gauge associations among variables. Results: The formation stage advanced with age, but wide standard deviations were noted. Similarly, the retromolar distance increased with age and was greatest between 10 and 12 years. The correlation between retromolar space and developmental stage was high (r 5 0.85). On average, an increase of 5 mm of retromolar space corresponds to a 1.8 stage in tooth maturation. Conclusions: The correlation between third molar mineralization and available retromolar space essentially represents the association between one biologic age (dental formation) and another growth-related event (mandibular skeletal growth). The findings do not necessarily reflect successful emergence or nonimpaction of the molars. Longitudinal data are needed to determine such outcomes. (Angle Orthod. 2014;84:946-950.)

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Effects of early loss of permanent first molars on the development of third molars

Cited by 51 publications

References 12 publications

Influence of unilateral maxillary first molar extraction treatment on second and third molar inclination in Class II subdivision patients

Influence of unilateral maxillary first molar extraction treatment on second and third molar inclination in Class II subdivision patients

Influence of first and second premolar extraction or non-extraction treatments on mandibular third molar angulation and position. A comparative study

Association between mandibular third molar formation and retromolar space

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