Early tooth movement with a clear plastic appliance in rats

Sombuntham, Nonglak; Songwattana, Siriwan; Atthakorn, Phumvuth; Jungudomjaroen, Sumon; Panyarachun, Busaba

doi:10.1016/j.ajodo.2007.08.021

Cited by 8 publications

(9 citation statements)

References 20 publications

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“…But the treatment duration was only eight weeks and only sagittal movements were conducted. In the animal experimental study of Sombuntham et al [18] clear plastic appliances were inserted but bonded to the residual dentition in rats. Their findings indicated initial superficial RR similar to RR in another group of rats, induced by a closed coil spring.…”

Section: Discussionmentioning

confidence: 99%

“…Their findings indicated initial superficial RR similar to RR in another group of rats, induced by a closed coil spring. Due to the partly bonding, this force application might not be directly comparable with sequential removable appliances in humans [18]. Thermoplastic aligners are commonly removed several times a day e.g.…”

Section: Discussionmentioning

confidence: 99%

“…Regarding the incidence of ARR and orthodontic treatment with removable thermoplastic appliances (aligners) there are only three publications available [16-18]. At first, a relation between aligner-therapy and RR was described in the case report of Brezniak and Wasserstein [16].…”

Section: Introductionmentioning

confidence: 99%

“…They reported that the aligner group had similar but slightly greater RR than the light-force group or approximately six times greater than the untreated control group [17]. Then, Sombuntham et al examined 2009 aligners and RR in an animal experimental study [18]. Clear plastic appliances were inserted and bonded to the residual dentition in rats for a maximum of seven days [18].…”

Section: Introductionmentioning

confidence: 99%

“…Then, Sombuntham et al examined 2009 aligners and RR in an animal experimental study [18]. Clear plastic appliances were inserted and bonded to the residual dentition in rats for a maximum of seven days [18]. They found histological changes of the periodontal ligament and initial superficial RR [18].…”

Section: Introductionmentioning

confidence: 99%

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Apical root resorption during orthodontic treatment with aligners? A retrospective radiometric study

et al. 2013

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IntroductionObjective of this study was to investigate the incidence and severity of apical root resorptions (ARR) during orthodontic treatment with aligners.Materials and methodsThe sample comprised 100 patients (17–75 years of age) with a class I occlusion and anterior crowding before treatment, treated exclusively with aligners (Invisalign®, Align Technologies, Santa Clara, CA, USA). The following teeth were assessed: upper and lower anterior teeth and first molars. Root and crown lengths of a total of 1600 teeth were measured twice in pre- and post-treatment panoramic radiographs. Afterwards, relative changes of the root length during treatment were calculated by a root-crown-ratio taking pre- and post-treatment root and crown lengths into consideration. A reduction of this ratio was considered as a shortening of the initial root length. Additionally, tooth movements of the front teeth were assessed by lateral cephalograms and the 3-dimensonal set up of each patient.ResultsAll patients had a reduction of the pre-treatment root length with a minimum of two teeth. On average 7.36 teeth per patient were affected. 54% of 1600 measured teeth showed no measurable root reduction. A reduction of >0%-10% of the pre-treatment root length was found in 27.75%, a distinct reduction of >10%-20% in 11.94%. 6.31% of all teeth were affected with a considerable reduction of >20%. We found no statistically significant correlation between relative root length changes and the individual tooth, gender, age or sagittal and vertical orthodontic tooth movement; except for extrusion of upper front teeth, which was considered as not clinical relevant due to the small amount of mean 4% ARR.ConclusionsThe present study is the first analyzing ARR in patients with a fully implemented orthodontic treatment with aligners (i.e. resolving anterior crowding). The variety was high and no clinical relevant influence factor could be detected. A minimum of two teeth with a root length reduction was found in every patient. On average, 7.36 teeth per patient were affected.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%