The effects of surgically assisted rapid maxillary expansion (SARME) on the dental show and chin projection

Xi, Tong; Laskowska, Magdalena; Voort, Neeltje van de; Ghaeminia, Hossein; Pawlak, Wojciech; Bergé, Stefaan; Maal, T.J.J.

doi:10.1016/j.jcms.2017.08.023

Cited by 16 publications

(19 citation statements)

References 26 publications

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“…A possible reason for the extrusion of the upper incisors in the final outcome is the previous performed SARME procedure and subsequent closing of the diastema in 50% of the patients. Xi et al [37] found an increase of the dental show by a mean of 2.2 ± 2.0 mm following SARME. Because most orthodontic mechanics without absolute anchorage are extrusive in nature [38], there should have been anticipated more for that.…”

Section: Virtual Setup Versus Final Outcomementioning

confidence: 94%

Virtual setup in orthodontics: planning and evaluation

et al. 2019

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Objectives The purpose of this study was to evaluate the clinical accuracy of virtual orthodontic setups by using a new CBCTbased approach. Materials and methods Ten patients who underwent pre-surgical orthodontics were included in this study. Pre-treatment and presurgical cone-beam CT (CBCT) scans and digital dental models were available. The pre-treatment digital dental model was used to create an orthodontic virtual setup. The digital dental models were fused with the corresponding CBCT scans, and the two CBCT scans were aligned using voxel-based matching. Moving each individual tooth from the virtual setup to the final outcome allows the calculation of the accuracy of the virtual setup by using an iterative closest point algorithm. Differences between virtual setup and final outcome were recorded as well as the ICC between two observers. Results The inter-observer variability showed a high level of agreement between the observers. The largest mean difference between observers was found in the cranial/caudal direction (0.36 ± 0.30 mm) and the roll rotation (1.54 ± 0.98°). Differences between the virtual setup and final outcome were small in the translational direction (0.45 ± 0.48 mm). Rotational mean differences were larger with the pitch of the incisors (0.00 ± 7.97°) and molars (0.01 ± 10.26°) as largest difference. Excessive extrusion of all upper teeth and more anterior movement than planned were seen for both upper and lower arch. Lower molars showed less extrusion. Clinical relevance The data of this study can be used to obtain more insight in the accuracy and achievability of orthodontic virtual setup. Tooth movement can now be studied in more details which can lead to new insights.

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Section: Virtual Setup Versus Final Outcomementioning

confidence: 94%

Virtual setup in orthodontics: planning and evaluation

et al. 2019

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“…Upper molars showed more extrusion than expected. An increased dental show and inferior movement of the maxilla after SARME has been described earlier [ 24 ]. This agrees with the effect found in this study and can be interpreted as a true influence on the found differences between setup and outcome.…”

Section: Discussionmentioning

confidence: 58%

The Prediction Accuracy of Digital Orthodontic Setups for the Orthodontic Phase before Orthognathic Surgery

Waard

Baan²,

Bruggink³

et al. 2022

JCM

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The purpose of this study was to verify whether pre-treatment digital setups can accurately predict the tooth positions after presurgical orthodontic treatment has been performed in a 3-dimensional way. Twenty-six patients who underwent a combined orthodontic-orthognathic surgical treatment were included. Pre-treatment digital dental models were merged with cone beam computed tomography (CBCT) scans. One operator fabricated virtual setups to simulate the tooth movements of the presurgical orthodontic treatment. Prior to surgery, digital dental models were merged with the CBCT scans. Differences between de virtual setups and the presurgical dental models were calculated using linear mixed model analyses. Differences in tooth displacements exceeding the boundaries of clinical acceptance (>2 degrees for rotations and >0.6 mm for translations) were found in 75% of the rotational and 52% of translational mean differences in the maxilla and in 74% of the rotational mean differences and 44% of the translational mean differences in the mandible. Significant differences were found for all tooth types and in all tooth displacement directions with significant effects of extractions and surgically assisted rapid maxillary expansion (SARME) procedures. The accuracy of the digital setup is still too limited to correctly simulate the presurgical orthodontic treatment.

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“…The lower-face height remained unchanged, which suggests that no mandibular rotation occurs. In a study by Tong and colleagues (17) a displacement of the chin (pogonion) in a posterior and inferior direction was demonstrated, suggesting the clockwise rotation of the mandible. Also, Oliveira and colleagues (18) reported in their study using CBCT (cone beam computer tomography) scans that a clockwise rotation of the mandible is a transient effect immediately after SARME, but tends to return close to the initial values 6 months after expansion.…”

Section: Discussionmentioning

confidence: 94%

An evaluation of three-dimensional facial changes after surgically assisted rapid maxillary expansion (SARME)

Zupan

Hren

Verdenik

2021

Preprint

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Background: The purpose of the study was to evaluate the three-dimensional (3D) facial changes following surgically assisted rapid maxillary expansion (SARME). In 15 skeletally mature patients with maxillary transverse deficiency the planned maxillary expansion (on average 8.8 mm ± 2.3 mm) was achieved with bone-borne palatal distractor. The 3D optical scans of the facial surface were obtained before and 6 months after SARME and compared with cephalometric and regional analysis to evaluate the soft-tissue changes. Findings. The largest differences between the pre- and post-operation scans were observed for the paranasal and cheek area (1.4 ± 1.0 mm) in the lateral direction with a soft-to-hard tissue ratio of 0.22. Significant differences occurred for an increased nasal width, a decreased upper-face height with an unchanged lower height, an increased vertical philtrum height and an increased nasolabial angle. A significant increase in the facial profile angle was also observed, resulting in an increased facial convexity and anterior displacement of the upper-lip area. Conclusions. We have confirmed the widening of the nose and increased projection in the cheek and paranasal area in the lateral direction after maxillary expansion, while we found facial convexity increases, reflecting the underlying advancement of the maxilla.

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The effects of surgically assisted rapid maxillary expansion (SARME) on the dental show and chin projection

Cited by 16 publications

References 26 publications

Virtual setup in orthodontics: planning and evaluation

Virtual setup in orthodontics: planning and evaluation

The Prediction Accuracy of Digital Orthodontic Setups for the Orthodontic Phase before Orthognathic Surgery

An evaluation of three-dimensional facial changes after surgically assisted rapid maxillary expansion (SARME)

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