A systematic review on soft-to-hard tissue ratios in orthognathic surgery part I: Maxillary repositioning osteotomy

Moragas, Joan San Miguel; Cauteren, Willem Van; Mommaerts, Maurice Y.

doi:10.1016/j.jcms.2014.03.024

Cited by 53 publications

(53 citation statements)

References 44 publications

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“…The use of V-Y closure after Le Fort I osteotomy seemed to be able to improve the simulation slightly, in contrast to the use of alar cinch sutures. This finding confirmed that MTM algorithm was able to give an acceptable prediction of the vermillion show (Nadjmi et al, 2013), as a V-Y closure was carried out to counteract the tendency for the shortening of the upper lip and to allow some eversion of the vermillion border (San Miguel Moragas et al, 2014). The alar cinch suture was primarily used to stabilize the alar width after surgery.…”

Section: Discussionsupporting

confidence: 64%

“…Jeon et al reported in their 3D soft tissue study that debonding of the labial brackets caused positional changes of the vermilion border up to 1.4 mm (Jeon et al, 2013). In addition, difficulties in reproducing a relaxed lip position during CBCT scans might have also increased the variations in the simulation of lip position (Mobarak et al, 2001;San Miguel Moragas et al, 2014). From the technical point of view, the large errors in the lip regions can also be caused by the fact that the software moves the CT data of the upper and lower lip as a continuous area, instead of considering them as two separate anatomical structures that move separately (Marchetti et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

“…based on the patient age and origin) and surgery type would be an option. The incorporation of certain clinically validated soft-tissue to hard-tissue ratios as described by the recent review of Moragas et al (San Miguel Moragas et al, 2014) may also contribute to a more accurate computing model, especially in terms of the incisal and vermillion show. In order to optimize these ratios, multicenter databases with pre-and postoperative soft tissue and hard tissue data need to be established.…”

Section: Discussionmentioning

confidence: 99%

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Accuracy of three-dimensional soft tissue simulation in bimaxillary osteotomies

Liebregts

Timmermans

et al. 2015

Journal of Cranio-Maxillofacial Surgery

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Section: Discussionsupporting

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Accuracy of three-dimensional soft tissue simulation in bimaxillary osteotomies

Liebregts

Timmermans

et al. 2015

Journal of Cranio-Maxillofacial Surgery

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“…Our study also showed that the A/subnasale ratio was 0.59 and different from the 0.33 reported in the 2D data. 17,18 We also found that the AP component of the A/subnasale ratio was 0.59 and different from the 0.33 reported in the 2D data (range 0.06 to 0.51; mean 0.33:1). 19–24 The ratio of the subnasale to point A was smaller than that of the lower lip and chin, suggesting that more movement will be needed in this area to produce a harmonious change.…”

Section: Discussioncontrasting

confidence: 68%

Soft Tissue Changes Measured With Three-Dimensional Software Provides New Insights for Surgical Predictions

Chang

Ruellas

Yatabe

et al. 2017

Journal of Oral and Maxillofacial Surgery

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Purpose Although computer-aided craniofacial reconstructions allow for simulation of hard tissue changes, the prediction of the final soft tissue facial changes remains a challenge. The purpose of the present study was to evaluate the 3-dimensional (3D) soft tissue changes in patients undergoing 2-jaw orthognathic surgery. Patients and Methods For the present retrospective cohort study, 40 consecutive patients (11 men and 29 women; mean age 23.5 ± 4.9 years) who had undergone 2-jaw orthognathic surgery were selected. We obtained the medical and dental records from 3 weeks before surgery and 6 months after surgery. We used image processing software to segment, superimpose, and quantify the hard and soft tissue displacements in 3 dimensions before and after surgery at 15 paired locations. The soft tissue and hard tissue changes were determined through quantification of homologous landmark displacements between the preoperative and postoperative computed tomography data. We measured the 3D soft and hard tissue changes and the anteroposterior, inferosuperior, and transverse components of the changes. We quantified the ratios between the soft and hard tissue changes, tested Pearson’s correlation between these changes, and developed a predictive regression equation for the observations at each location. Results We found that soft tissue movement followed the hard tissue movement, with a correlation nearly equal to 0.9 (range 0.85 to 0.98), suggesting that in general the soft tissues of the maxillary and mandibular landmarks are affected similarly by the skeletal movements. The anteroposterior component of the soft tissue 3D displacements followed the hard tissue movement with a ratio greater than 0.9 and with high correlation (r > 0.9) in the mandible. Conclusion The results of the present study provide surgeons with a ratio of hard to soft tissue change and the strength of the correlations, which will allow for more accurate 3D predictions for both midline and lateral structures in bimaxillary orthognathic surgical cases. In addition, predictive equations for various landmarks were developed and can be used in computer-based prediction programs to aid in treatment planning of soft tissue changes.

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“…El diagnóstico de sujetos con patología creaneofacial tradicionalmente se ha realizado con tecnología 2D utilizando cefalogramas bidimensionales (2D); bajo esa metodología se han desarrollado la mayoría de las investigaciones (San Miguel de Moragas et al, 2014;San Miguel de Moragas et al, 2015;Olate et al, 2016); sin embargo, las mismas investigaciones han demostrado variabilidad en resultados toda vez que la condición tridimensional (3D) del rostro limitan el consenso y precisión en los análisis 2D. Swennen et al (2006) indicaron que los estudios 2D son factibles de presentar sesgo en términos de relación entre tejidos duros y blandos; sin embargo, los estudios 3D no han mostrado claridad en los resultados presentados y se han observado múltiples sesgos en las investigaciones publicadas que aumentan las limitaciones observadas en los estudios (Olate et al, 2017).…”

Section: Discussionunclassified

Comparación entre las Técnicas de Ricketts y McNamara para la Determinación de la Posición del Maxilar y la Mandíbula en Jóvenes del Ecuador

2018

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1,4,5 GUERRERO, M.; OCAMPO, J. & OLATE, S.Comparación entre las técnicas de Ricketts y McNamara para la determinación de la posición del maxilar y la mandíbula en jóvenes del Ecuador. Int. J. Morphol., 36(1):169-174, 2018. RESUMEN:Los análisis cefalométricos, a partir de una radiografía lateral de cráneo, son amplios y variados considerando tanto los patrones funcionales como los de estética facial. Entre las técnicas de medición en cefalometría, Ricketts y de McNamara son ampliamente utilizados; ambas le entregan importancia a determinar la posición del maxilar y de la mandíbula con diferentes relaciones esqueletales. El objetivo de esta investigación es comparar ambas técnicas en una población joven de Ecuador; se realizó un análisis de concordancia utilizando el índice kappa de Cohen entre los resultados de las mediciones correspondientes a 44 radiografías cefálicas laterales de sujetos jóvenes entre 18 y 27 años de edad, de ambos sexos. En relación a la posición maxilar, el 56,82 % (IC 95 %: 42,18 % -71,45 %) coinciden en el diagnóstico de protrusión maxilar; el índice de concordancia kappa de Cohen fue de 0,599 (IC 95 %: 0,354 -0,854) con un valor p<0,05. En relación a la posición mandibular, el 50,0 % (IC 95 %: 35,23 % -64,77 %) coinciden en el diagnóstico de retrusión mandibular; el índice kappa de Cohen fue de 0,460 (IC 95 % 0,229 -0,691) con un valor p<0,05. Se concluye que, a pesar de manejar puntos de referencia cefalométricos diferentes, las dos técnicas de medición cráneo-facial son útiles para el estudio de posición de maxila y mandíbula. Existen diferencias entre algunos analisis de ambos estudios que pueden incidir en la selección terapéutica de potenciales pacientes.

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A systematic review on soft-to-hard tissue ratios in orthognathic surgery part I: Maxillary repositioning osteotomy

Cited by 53 publications

References 44 publications

Accuracy of three-dimensional soft tissue simulation in bimaxillary osteotomies

Accuracy of three-dimensional soft tissue simulation in bimaxillary osteotomies

Soft Tissue Changes Measured With Three-Dimensional Software Provides New Insights for Surgical Predictions

Comparación entre las Técnicas de Ricketts y McNamara para la Determinación de la Posición del Maxilar y la Mandíbula en Jóvenes del Ecuador

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