Perawatan Gigitan Terbuka Anteroposterior Tipe Skeletal dengan Teknik Straightwire

Gigitan terbuka merupakan maloklusi yang bercirikan tidak terdapatnya tutup menutup gigi rahang atas dan bawah, dapat terjadi pada regio anterior maupun posterior dan dapat melibatkan dental maupun skeletal. Maloklusi ini memerlukan ketelitian dalam penentuan diagnosis dan perawatan untuk mendapatkan hasil perawatan yang baik dan kestabilan jangka panjang. Tujuan penulisan studi kasus ini adalah untuk menginformasikan manajemen pasien dengan gigitan terbuka tipe skeletal. Pasien pria berumur 19 tahun datang ke Klinik Ortodonsia FKG UGM dengan keluhan utama gigi depan yang tidak rata dan tidak dapat digunakan untuk menggigit. Pemeriksaan klinis menunjukkan pasien memiliki kebiasaan menelan dengan menjulurkan lidah. Pemeriksaan model studi menunjukkan maloklusi Angle kelas I dengan gigitan terbuka anterior dari regio premolar kedua kanan ke kiri sebesar 10,7 mm disertai malposisi gigi individual dan pergeseran garis tengah rahang bawah ke kiri. Pemeriksaan sefalometri menunjukkan relasi skeletal kelas II dengan retrusif bimaksila, rotasi mandibula searah jarum jam dan gigitan terbuka skeletal. Pasien menolak tindakan bedah ortognatik sehingga dilakukan perawatan ortodontik kamuflase. Perawatan diawali dengan latihan miofungsional untuk melatih cara penelanan yang benar dilanjutkan dengan perawatan ortodontik teknik straightwire dengan pencabutan empat gigi molar pertama. Penutupan gigitan terbuka menggunakan elastic box anterior. Hasil evaluasi menunjukkanpengurangan besar gigitan terbuka dari 10,7 mm menjadi 1,25 mm. Kesimpulannya elastic box anterior dapat digunakan untuk mengoreksi gigitan terbuka yang etiologinya melibatkan intrusi gigi anterior. Skeletal Anteroposterior Open Bite Treatment with Straight Wire Technique. Open bite is a malocclusion with characteristic no overlapping between maxillar and mandibular teeth. This malocclusion may occur in anterior or posterior region and involved dental or skeletal. This malocclusion needed precise diagnosis and treatment to get a good treatment result and long term stability. The aim of this case report was to inform management of patient with skeletal open bite. A 19 years old male came to orthodontic clinic Faculty of Dentistry Gadjah Mada University with the chief complaint anterior crowding, and anterior teeth cannot be used to bite. Clinical finding showed patient had tongue thrusting habit. Study model analysis showed class I Angle malocclusion with 10.7 mm anterior open bite from right second premolar to left second premolar, with individual teeth malposition and mandibular midline shifting to the left. Cephalometric finding showed class II skeletal relationship with bimaxillar retrusive, clockwise mandibular rotation and skeletal open bite. This patient refused orthognatic surgery, so he received camouflage orthodontic treatment. This treatment was started with monofunctional exercise to correct the swallowing action then continued with straight wire orthodontic treatment with four first molar extractions. Anterior box elastic was used to close the bite. Evaluation result showed open bite was decreased from 10.7 mm to 1.25 mm. The conclusion was anterior box elastic could be used in open bite correction that involved anterior teeth intrusion as an etiology.

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Perawatan Ortodontik Gigitan Terbuka Anterior

Majalah Kedokteran Gigi Indonesia ◽

10.22146/majkedgiind.8304 ◽

2014 ◽

Vol 21 (1) ◽

pp. 1

Author(s):

Yuniar Zen

Keyword(s):

Clinical Skill ◽

Treatment Method ◽

Open Bite ◽

Treatment Modalities ◽

Treatment Result ◽

Anterior Open Bite ◽

Orthodontic Patients ◽

Orthognatic Surgery ◽

The Stability ◽

Skeletal Open Bite

Perawatan gigitan terbuka anterior telah lama dianggap sebagai tantangan bagi ortodontis. Prevalensi gigitan terbuka anterior antara 3,5% hingga 11% terdapat pada berbagai usia dan kelompok etnis, serta ada sekitar 17% pasien ortodonti memiliki gigitan terbuka. Stabilitas hasil perawatan gigitan terbuka anterior sangat sulit, karena adanya kombinasi diskrepansi anteroposterior dengan gigitan terbuka skeletal sehingga dibutuhkan tingkat keterampilan diagnosis dan klinis yang tinggi. Etiologi gigitan terbuka anterior sangat kompleks karena dapat melibatkan skeletal, dental, dan faktor-faktor habitual. Eliminasi faktor etiologi merupakan hal yang penting dalam perawatan gigitan terbuka anterior. Berbagai cara perawatan untuk koreksi gigitan terbuka anterior diantaranya bedah ortognatik dan perawatan ortodontik kamuflase, seperti high-pull headgear, chincup, bite blocks, alatfungsional, pencabutan gigi, multi-loop edgewise archwires dan mini implan. Stabilitas hasil perawatan adalah kriteria yang paling penting dalam menentukan cara perawatan gigitan terbuka anterior.Orthodontic Treatment of Anterior Open Bite. An anterior open bite therapy has long been considered a challenge to orthodontist. The prevalence of anterior openbite range from 3,5 % to 11% among various age and ethnic groups and it has been shown that approximately 17% of orthodontic patients have open bite. Stability of treatment result of anterior open bite with well-maintained results is difficult, because the combination of anteroposteriorly discrepancy with skeletal open bite requires the highest degree of diagnostic and clinical skill. The etiology is complex, potentially involving skeletal, dental and habitual factors. The importance of an anterior open bite therapy is to eliminate the cause of the open bite. Various treatment modalities for the correction of an anterior open bite have been proposed, orthognatic surgery and orthodontic camouflage treatment such as high-pull headgear, chin cup, bite blocks, functional appliances, extractions, multi-loop edgewise arch wires and mini implant. The stability is the most important criterion in deciding the treatment method for anterior open bite malocclusion.

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Dentoskeletal and Tongue Soft-Tissue Correlates: A Cephalometric Analysis of Rest Position

International Journal of Orofacial Myology ◽

10.52010/ijom.1985.11.3.3 ◽

1985 ◽

Vol 11 (3) ◽

pp. 14-22

Author(s):

Alan Lowe ◽

◽

Kenji Takada ◽

Yoshiaki Yamagata ◽

Mamoru Sakuda ◽

...

Keyword(s):

Soft Tissue ◽

Principal Component ◽

Correlation Factor ◽

Open Bite ◽

Occlusal Plane ◽

Anterior Open Bite ◽

Lower Incisor ◽

Rest Position ◽

Mandibular Teeth ◽

Skeletal Open Bite

The relationship between dentoskeletal and tongue soft-tissue variables has been quantified in a sample of 60 adult females with normal and anterior open-bite malocclusions. Three lateral rest-position head films were obtained for each subject. A principal component analysis reduced the data base and six significant canonical correlations were identified. The first canonical correlation (r, = 0.962) represented a size-related correlation factor between the two groups of variables. Subjects with characteristics of a short face syndrome and some evidence of overbite had tongue tips positioned below the lower occlusal plane (r2 = 0.929). In contrast, skeletal open-bite subjects (r. = 0.759) revealed tongue tips ahead of and above the lower incisor teeth with the mandible in the rest position. Undererupted mandibular teeth (r5 = 0.666) were associated with a reduced tongue height and an inferior epiglottis; short tongue length (r6 = 0.563) correlated with a linear combination of upright central incisors, a small overjet, a low ANS angle, unerupted maxillary and mandibular teeth, and a steep occlusal plane. The multivariate statistical analysis extracted clinically significant associations between tongue soft-tissue and dentoskeletal variables. Tongue posture at rest in skeletal open-bite subjects appeared to be related to incisor position. (AM J ORTHOD 88: 333-341, 1985.)

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Mechanism of Multi-loop Edgewise Archwire technique in correcting anterior open bites of Class II malocclusion patients with temporomandibular disorders - cephalometric assessment

10.21203/rs.3.rs-31981/v1 ◽

2020 ◽

Author(s):

Huanye Liu ◽

Heeyeon Suh ◽

Young-Eun Jung ◽

Kaiyuan Xu ◽

Dan Zhang ◽

...

Keyword(s):

Temporomandibular Disorders ◽

Orthodontic Treatment ◽

Open Bite ◽

Etiologic Factor ◽

Class Ii Malocclusion ◽

Anterior Open Bite ◽

Anterior Teeth ◽

Primary Mechanism ◽

Cephalometric Measurements ◽

Paired T Test

Abstract Background: An anterior open bite is considered challenging to treat because of its multifactorial etiology. Condylar resorption, which is one of the temporomandibular disorders (TMD) symptoms, has been identified as an etiologic factor of anterior open bites. It is essential to find an effective and efficient method to correct open bites while reducing the risk of exacerbating TMD during orthodontic treatment.Objectives: To evaluate the effect of the multi-loop edgewise archwire (MEAW) technique in correcting anterior open bite in patients with TMD. Materials and Methods: In this retrospective study, 20 patients with anterior open bites and TMD were included. 19 cephalometric measurements and 2 open bite indices were evaluated. A paired t-test was used to assess changes between pre- and post-treatments. Results: There were statistically significant changes after the treatment using the MEAW technique. The cephalometric measurements, including vertical positions of the incisors and molars, changed significantly. The maxillary and mandibular regional superimpositions for a subgroup of non-extraction patients showed slight intrusion of the upper molars (-0.6±1.0mm, p=0.04) and slight extrusion of the lower molars (1.0±1.1mm, p<0.01). Open bite correction was achieved predominantly through retraction and extrusion of the upper and lower incisors. Conclusions: The anterior open bite was successfully corrected by using the MEAW technique. However, the primary mechanism was the extrusion of the anterior teeth with a maintained vertical dimension. In the absence of apparent symptoms of joint discomfort, it is effective and relatively safe to use the MEAW technique to treat open bite patients with TMD.

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Orthodontic management of a non-syndromic patient with concomitant bimaxillary hypohyperdontia: a case report

Dental Press Journal of Orthodontics ◽

10.1590/2177-6709.25.1.036-046.oar ◽

2020 ◽

Vol 25 (1) ◽

pp. 36-46 ◽

Cited By ~ 1

Author(s):

Ei Ei Hsu Hlaing ◽

Yoshihito Ishihara ◽

Atsuro Fujisawa ◽

Takashi Yamashiro ◽

Hiroshi Kamioka

Keyword(s):

Case Report ◽

Orthodontic Treatment ◽

Open Bite ◽

Class Iii ◽

Anterior Open Bite ◽

Maxillary Central Incisor ◽

Anterior Teeth ◽

Maxillary Molar ◽

Effective Option ◽

Numerical Variation

ABSTRACT Introduction: Tooth agenesis is one of the most common dental anomalies; however, the concomitant occurrence of opposite dental numerical variation of hypohyperdontia is extremely rare. Objective: To report the successful orthodontic management of a patient with non-syndromic concomitant bilateral agenesis of mandibular canines and two midline inverted supernumerary maxillary teeth. Case report: 21-year-old female patient with a chief complaint of protrusive right maxillary central incisor. The patient was diagnosed with a mild Class II skeletal base, Angle Class III molar relationship and increased overjet associated with hypohyperdontia. Anterior open bite accompanied with tongue-thrusting habit were also observed. Two temporary anchorage devices (TADs) were implanted at the buccal side of the maxillary molar region to control vertical height. Anterior teeth retraction was done after extraction of the maxillary first premolars, to improve the excessive overjet. The treatment mechanics involved lingual brackets system for the maxillary arch and transpalatal arch for anchorage control. Results: The total active treatment period was 35 months. Acceptable occlusion with increased bite force and contact area as well as functional excursion were established without interference, following complex orthodontic treatment with premolar substitution. The resultant occlusion and a satisfactory facial profile were maintained after 29 months of retention. Conclusion: The present case report provides implications regarding the orthodontic treatment of hypohyperdontia-associated substitution for missing teeth as an effective option for improving aesthetic and functional aspects.

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Dual Segmental Distraction Osteogenesis of the Midface in a Patient with Apert Syndrome

The Cleft Palate-Craniofacial Journal ◽

10.1597/04-151.1 ◽

2006 ◽

Vol 43 (4) ◽

pp. 499-506 ◽

Cited By ~ 9

Author(s):

Mariko Takashima ◽

Noriyuki Kitai ◽

Shumei Murakami ◽

Satoshi Takagi ◽

Ko Hosokawa ◽

...

Keyword(s):

Distraction Osteogenesis ◽

Orthodontic Treatment ◽

Open Bite ◽

Apert Syndrome ◽

Postoperative Treatment ◽

Treatment Results ◽

Anterior Open Bite ◽

Maxillary Protraction ◽

Midfacial Hypoplasia ◽

Mandibular Teeth

Objective To present orthodontic treatment combined with dual segmental distraction osteogenesis in a patient with Apert syndrome. Patient A 15-year-old boy exhibited severe midfacial hypoplasia with retruded and hypoplastic maxilla and anterior open bite. The patient was treated with a rigid external distraction II system for distraction osteogenesis, a preadjusted edgewise appliance, and a modified maxillary protraction headgear. The concave profile with midfacial hypoplasia was improved. A tight occlusal relationship between maxillary and mandibular teeth was achieved. Postoperative treatment results have been stable for 1 year.

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Perawatan ortodonti kamuflase pada maloklusi kelas III skeletal dengan gigitan terbuka anteriorOrthodontic camouflage of skeletal class III malocclusion with an anterior open-bite

Jurnal Kedokteran Gigi Universitas Padjadjaran ◽

10.24198/jkg.v32i3.30666 ◽

2021 ◽

Vol 32 (3) ◽

pp. 120

Author(s):

William Suryajaya ◽

Haru Setyo Anggani

Keyword(s):

Case Report ◽

Treatment Modality ◽

Orthodontic Treatment ◽

Open Bite ◽

Anterior Region ◽

Class Iii ◽

Class Iii Malocclusion ◽

Anterior Open Bite ◽

Skeletal Class ◽

Anterior Teeth

Pendahuluan: Perawatan ortodonti kamuflase adalah perawatan untuk menyamarkan diskrepansi skeletal dengan mengubah posisi dan angulasi gigi-gigi pada lengkung rahang. Perawatan tersebut merupakan perawatan yang dapat dipilih selain bedah ortognatik bagi kasus maloklusi skeletal kelas III pada pasien dewasa. Maloklusi skeletal kelas III sering pula disertai dengan keadaan lain seperti gigitan terbuka anterior yang menambah kompleksitas modalitas perawatan. Tujuan laporan kasus ini untuk menjelaskan pilihan modalitas perawatan pasien maloklusi skeletal kelas III secara kamuflase ortodonti. Laporan kasus: Pasien wanita usia 19 tahun 2 bulan datang ke klinik Ortodonti RSGM FKG UI dengan keluhan gigi atas depan tidak teratur dan gigi depan atas dan bawah tidak bertemu. Diagnosis menunjukkan pola skeletal kelas III dengan posisi maksila dan mandibula terhadap basis cranii retrognati (SNA 73°, SNB 74°, ANB -1°) disertai dengan crowding sedang dan gigitan terbuka anterior. Tipe wajah pasien dolikofasial, simetris dan seimbang. Profil jaringan lunak dan skeletal cekung. Kasus ini dirawat dengan pendekatan ortodonti kamuflase tanpa pencabutan menggunakan piranti cekat standar Edgewise untuk mengoreksi crowding pada lengkung gigi atas dan bawah serta gigitan terbuka pada regio anterior. Perawatan ortodonti selesai dalam waktu 13 bulan dan crowding pada lengkung gigi atas dan bawah serta gigitan terbuka pada regio anterior telah terkoreksi. Simpulan: Perawatan ortodonti kamuflase pada maloklusi kelas III skeletal dengan gigitan terbuka anterior ringan merupakan pilihan perawatan yang cukup baik karena dapat mengoreksi maloklusi dengan kompensasi dentoalveolar sehingga diperoleh oklusi yang baik dan stabil. Hasil perawatan menunjukan hasil yang cukup baik dan dapat diterima oleh pasien.Kata kunci: Maloklusi skeletal kelas III, crowding, open-bite anterior, standar edgewise, ortodonti kamuflase. ABSTRACTIntroduction: Orthodontic camouflage is a treatment to disguise skeletal discrepancies by changing the teeth position and angulation in the jaw arch. This treatment is an option other than orthognathic surgery for skeletal class III malocclusion in adult patients. Skeletal class III malocclusion is often accompanied by other conditions such as an anterior open-bite which adds the complexity of the treatment modality. This case report was aimed to describe the choice of treatment modality for skeletal class III malocclusion patients by orthodontic camouflage. Case report: A female patient aged 19 years and two months came to the Orthodontic Clinics at the Faculty of Dentistry of University of Indonesia Dental Hospital (RSGM FKG UI) with complaints of irregular maxillary anterior teeth, and the maxillary and mandibular anterior teeth did not overlap. The diagnosis showed a skeletal class III pattern with the maxillary and mandibular position against the retrognathic cranii base (SNA 73°, SNB 74°, ANB -1°) accompanied by moderate crowding and anterior open-bite. The patient’s face type is dolichofacial, symmetrical and balanced, with the concave soft and skeletal tissue profiles. This case was treated with a non-extraction camouflage orthodontic approach using the standard edgewise fixed appliance to correct crowding in the maxillary and mandibular dental arches and open-bite in the anterior region. The orthodontic treatment was completed within 13 months, and crowding in the maxillary and mandibular dental arches and open-bite in the anterior region were corrected. Conclusion: Camouflage orthodontic treatment is a good treatment option for skeletal class III malocclusion with a mild anterior open-bite because it can correct malocclusion with dentoalveolar compensation to obtain a good and stable occlusion. The treatment results show good results and can be accepted well by the patient.Keywords: Skeletal class III malocclusion, crowding, anterior open-bite, standard edgewise, orthodontic camouflage.

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Mechanism of Multi-loop Edgewise Archwire technique in correcting Class II anterior open bites with temporomandibular disorders – a retrospective cephalometric study in Chinese patients

10.21203/rs.3.rs-31981/v2 ◽

2020 ◽

Author(s):

Huanye Liu ◽

Heeyeon Suh ◽

Young-Eun Jung ◽

Kaiyuan Xu ◽

Dan Zhang ◽

...

Keyword(s):

Temporomandibular Disorders ◽

Orthodontic Treatment ◽

Class Ii ◽

Open Bite ◽

Chinese Patients ◽

Etiologic Factor ◽

Anterior Open Bite ◽

Anterior Teeth ◽

Cephalometric Study ◽

Cephalometric Measurements

Abstract Background: An anterior open bite is considered challenging to treat because of its multifactorial etiology. Condylar resorption, which is one of the temporomandibular disorders (TMD) symptoms, has been identified as an etiologic factor of anterior open bites. It is essential to find an effective and efficient method to correct open bites while reducing the risk of exacerbating TMD during orthodontic treatment.Objectives: To evaluate the effect of the multi-loop edgewise archwire (MEAW) technique in correcting anterior open bite in patients with TMD. Materials and Methods: In this retrospective study, 20 patients with anterior open bites and TMD were included. 19 cephalometric measurements and 2 open bite indices were evaluated. A paired t-test was used to assess changes between pre- and post-treatments. Results: There were statistically significant changes after the treatment using the MEAW technique. The cephalometric measurements, including vertical positions of the incisors and molars, changed significantly. The maxillary and mandibular regional superimpositions for a subgroup of non-extraction patients showed slight intrusion of the upper molars (-0.6±1.0mm, p=0.04) and slight extrusion of the lower molars (1.0±1.1mm, p<0.01). Open bite correction was achieved predominantly through retraction and extrusion of the upper and lower incisors. Conclusions: The MEAW technique can be an effective method in correcting anterior open bites in Class II patients with TMD. Anterior open bites were corrected mainly by extrusion and retraction of the anterior teeth. The vertical dimension was maintained for the upper molars, but the mandibular molars were extruded. During treatment, the patients who had TMD did not show evident recurrence or worsening of their TMD conditions, indicating that orthodontic treatment can be performed when required.

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Angle Class I malocclusion with anterior open bite treated with extraction of permanent teeth

Dental Press Journal of Orthodontics ◽

10.1590/s2176-94512013000200025 ◽

2013 ◽

Vol 18 (2) ◽

pp. 133-140

Author(s):

Matheus Melo Pithon

Keyword(s):

Orthodontic Treatment ◽

Clinical Case ◽

Case Reports ◽

Open Bite ◽

Class I ◽

Permanent Teeth ◽

Anterior Open Bite ◽

Anterior Teeth ◽

Angle Class ◽

Tooth Extractions

This clinical case reports the orthodontic treatment of a Class I malocclusion with anterior open bite and bimaxillary dentoalveolar protrusion in a 28-year-old female patient. The treatment of choice was to perform tooth extractions followed by retraction of the anterior teeth, with consequent closure of the anterior open bite and better accommodation of the teeth on their bony bases. This case was presented to the Brazilian Board of Orthodontics and Facial Orthopedics (BBO), representing the Category 2 - i.e., an Angle Class I malocclusion, with anterior open bite, treated with extraction of permanent teeth -, as part of the requisites to become a BBO diplomate.

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The Impact of Orthodontic Treatment on Pre-Existing Gingival Recessions: A Retrospective Study

Applied Sciences ◽

10.3390/app11199036 ◽

2021 ◽

Vol 11 (19) ◽

pp. 9036

Author(s):

Guostė Antanavičienė ◽

Eglė Zasčiurinskienė ◽

Dalia Smailienė ◽

Nomeda Basevičienė

Keyword(s):

Retrospective Study ◽

Orthodontic Treatment ◽

Negative Impact ◽

Open Bite ◽

Class Iii ◽

Before And After ◽

Pre Treatment ◽

Mandibular Teeth ◽

The Impact ◽

Plaster Models

(1) Background: This retrospective study aimed to examine the change of gingival recessions (GR) before and after orthodontic treatment (OT). (2) Methods: Patients who had at least one GR on the vestibular surface of maxillary/mandibular teeth mesial to first molars were included. GR was measured on good quality plaster models before and after OT. (3) Results: Significant improvement of mean GR at patient level was found between T0 and T1 (0.45 mm, 95% CI: 0.28, 0.62) (p < 0.001). In 51.4% of patients GRs became better, in 37.8% GRs did not change. and in 10.8% GRs became worse. At tooth level the mean GR improvement was 0.54 mm (CI: 0.42, 0.65; median 0.55 mm Q1; Q3: 0.12, 0.96) (p < 0.001). GR improved in 67 teeth (58.7%), did not change in 41 (36.0%), and worsened in 6 (5.3%). Full healing was observed in 15 teeth. A reduced GR improvement was found in cases with pre-treatment open bite (OR 3.89; CI: 1.35, 11.16; p = 0.008) and dental Class III patients (OR 2.6; CI: 1.11, 6.0; p = 0.026). (4) Conclusion: There was an improvement of GR after OT in more than half of the patients. Class III malocclusion and reduced pre-treatment overbite had a negative impact on GR improvement.

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

Head & Face Medicine ◽

10.1186/1746-160x-9-21 ◽

2013 ◽

Vol 9 (1) ◽

Cited By ~ 21

Author(s):

Elena Krieger ◽

Thomas Drechsler ◽

Irene Schmidtmann ◽

Collin Jacobs ◽

Simeon Haag ◽

...

Keyword(s):

Root Length ◽

Orthodontic Treatment ◽

Influence Factor ◽

Root Resorption ◽

Post Treatment ◽

Anterior Crowding ◽

Anterior Teeth ◽

Lateral Cephalograms ◽

Length Changes ◽

Pre Treatment

Abstract Introduction Objective of this study was to investigate the incidence and severity of apical root resorptions (ARR) during orthodontic treatment with aligners. Materials and methods The 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. Results All 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. Conclusions The 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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