The effect of extraction of third molars on late lower incisor crowding: a randomized controlled trial.

Harradine, Nigel; Pearson, Michael H.; Toth, Ben

doi:10.1093/ortho/25.2.117

Cited by 114 publications

(111 citation statements)

References 21 publications

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“…During the last century, many factors, such as treatment modalities, [8][9][10] preservation of original mandibular intercanine width, 11,12 continued growth, 13,14 influence of gingival tissues, 15,16 and role of third molars, 17,18 were investigated as contributors to relapse. A few studies have attempted to compare different retainers and protocols, ranging from minimal retention 19 to permanent retention.…”

Section: Introductionmentioning

confidence: 99%

Short-term postorthodontic changes in the absence of retention

Lyotard¹,

Hans

Nelson

et al. 2010

The Angle Orthodontist

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Objective: To evaluate short-term postorthodontic tooth movement without retention. Materials and Methods: Thirty consenting patients participated in the study. At the end of active treatment (T 1 ), final archwires were removed while leaving the fixed appliances on, and alginate impressions were taken. Four weeks later (T 2 ) a second set of impressions was taken. A clinical examination performed at T 2 determined if the fixed appliances could be removed or if additional treatment was required. Based on the examination, patients were divided into two groups. Patients in group I (n 5 13) had their fixed appliances removed, while those in group II (n 5 17) required additional treatment. The American Board of Orthodontics' Objective Grading System scores and the following six variables were measured on plaster casts at T 1 and T 2 : maxillary and mandibular crowding or spacing, overbite, overjet, and mandibular intercanine and intermolar widths. Data were analyzed to detect potential changes from T 1 to T 2 and to evaluate differences between the groups. Results: Mandibular crowding, overjet, and interproximal contacts worsened for the entire sample, while marginal ridges, occlusal contacts, and total American Board of Orthodontics scores improved. No statistically significant changes were found within group I from T 1 to T 2 . Mandibular crowding, overbite, overjet, alignment/rotations, and interproximal contacts worsened within group II from T 1 to T 2 , while marginal ridges and occlusal contacts improved. Significant differences were noted between the groups in terms of alignment/rotations, interproximal contacts, and mandibular intercanine width. Conclusion: Short-term postorthodontic tooth movement without retainers demonstrated improvement in specific characteristics of the occlusion but negatively affected alignment and interproximal contacts in the sample.

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Section: Introductionmentioning

confidence: 99%

Short-term postorthodontic changes in the absence of retention

Lyotard¹,

Hans

Nelson

et al. 2010

The Angle Orthodontist

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“…Their conclusions stated that evidence on the role of third molars as etiologic factor in the late lower arch crowding is lacking, similarly to the ones of the previous study [4]. The Scientific World Journal Harradine et al [5] described analogous outcome in subjects who underwent orthodontic treatment. They examined the effect of third molar extraction on the development of anterior mandibular dental crowding in a randomized controlled study.…”

Section: Introductionmentioning

confidence: 64%

The Role of Mandibular Third Molars on Lower Anterior Teeth Crowding and Relapse after Orthodontic Treatment : A Systematic Review

Zawawi¹,

Melis²

2014

SDJ

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Aims. To evaluate the role of third molars in the development of crowding or relapse after orthodontic treatment in the anterior segment of the dental arch. Methods. PubMed search of the literature was performed selecting all the articles relevant to the topic and limiting the studies to controlled trials on humans and written in English language. Systematic review was conducted according to the PRISMA (preferred reporting items for systematic reviews and meta-analyses) statement. Results. A total of 12 clinical studies were included in the review. A high risk of bias was found in most of the articles, either because the relative items assessed were inadequate or because they were unclearly described. The third molars were not correlated with more severe anterior tooth crowding in most of the studies. However, four of them described a different outcome. Conclusion. Definitive conclusions on the role of the third molars in the development of anterior tooth crowding cannot be drawn. A high risk of bias was found in most of the trials, and the outcomes were not consistent. However, most of the studies do not support a cause-and-effect relationship; therefore, third molar extraction to prevent anterior tooth crowding or postorthodontic relapse is not justified.

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“…This is an attractive concept as it implies that mandibular anterior crowding cannot be prevented and is just part of aging. Multiple studies have found no clinically significant reduction in mandibular anterior crowding with the removal of third molars or in patients who are congenitally missing third molars [6]. Other theories in this category attribute late mandibular anterior crowding to occlusal forces, eruption patterns or muscle function.…”

Section: Discussionmentioning

confidence: 99%

Mandibular anterior dental irregularity in a population living a century ago

Burnheimer¹

2017

Dent Oral Craniofac Res

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Objective: The aim of this study is to observe and measure the amount of anterior dental irregularity in an adult 19th century population and compare that to a current adult population. Methodology:The School of Dental Medicine, University of Pittsburgh possesses a collection of skulls from the late 19th and early 20th century. Most likely those individuals had lived throughout the northeast United States. Twenty-eight skulls were evaluated for the presence or absence of mandibular anterior irregularity and these were compared to modern day alignment values.Results: 50% of the observed mandibular dental arches were positive for anterior dental irregularity, which is lower than the current day population in the United States. There was no difference in dental irregularity between males or females in this population. According to Little's Irregularity Index, males over the age of 40 years had the most irregularity. Conclusion:In this population living a century ago, there was less prevalence of anterior dental irregularity than modern research suggests.

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The effect of extraction of third molars on late lower incisor crowding: a randomized controlled trial.

Cited by 114 publications

References 21 publications

Short-term postorthodontic changes in the absence of retention

Short-term postorthodontic changes in the absence of retention

The Role of Mandibular Third Molars on Lower Anterior Teeth Crowding and Relapse after Orthodontic Treatment : A Systematic Review

Mandibular anterior dental irregularity in a population living a century ago

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