Comparison of time and cost between conventional surgical planning and virtual surgical planning in orthognathic surgery in Korea

Abstract Background The purpose of this study was to measure the time of the conventional surgical planning (CSP) and virtual surgical planning (VSP) in orthognathic surgery and to compare them in terms of cost. Material and method This is a retrospective study of the patients who underwent orthognathic surgery at the OOOOO University Dental Hospital from December 2017 to August 2018. All the patients were analyzed through both CSP and VSP, and all the surgical stents were fabricated through manual and 3-dimensional (3D) printing. The predictor variables were the planning method (CSP vs. VSP) and the surgery type (group I: Le Fort I osteotomy+bilateral sagittal split osteotomy [LFI+BSSO] or group II: only bilateral sagittal split osteotomy [BSSO]), and the outcomes were the time and cost. The results were analyzed using paired t test. Results Thirty patients (12 females, 18 males) met the inclusion criteria, and 17 patients were excluded from the study due to missing or incomplete data. There were 20 group I patients (LFI+BSSO regardless of genioplasty) and 10 group II patients (BSSO regardless of genioplasty). The average time of CSP for group I was 385±7.8 min, and that for group II was 195±8.33 min. The time reduction rate of VSP compared with CSP was 62.8% in group I and 41.5% in group II. On the other hand, there was no statistically significant cost reduction. Conclusions The time investment in VSP in this study was significantly smaller than that in CSP, and the difference was greater in group I than in group II.

Download Full-text

Comparison of time and cost between conventional surgical planning and virtual surgical planning in orthognathic surgery in Korea

Maxillofacial Plastic and Reconstructive Surgery ◽

10.1186/s40902-019-0220-6 ◽

2019 ◽

Vol 41 (1) ◽

Cited By ~ 3

Author(s):

Si-Yeon Park ◽

Dae-Seok Hwang ◽

Jae-Min Song ◽

Uk-Kyu Kim

Keyword(s):

Orthognathic Surgery ◽

Surgical Planning ◽

Three Dimensional ◽

Reduction Rate ◽

Virtual Surgical Planning ◽

Time Investment ◽

Sagittal Split Osteotomy ◽

Group I ◽

Bilateral Sagittal Split Osteotomy ◽

Group Ii

Abstract Background The purpose of this study was to measure the time of the conventional surgical planning (CSP) and virtual surgical planning (VSP) in orthognathic surgery and to compare them in terms of cost. Material and method This is a retrospective study of the patients who underwent orthognathic surgery at the Pusan National University Dental Hospital from December 2017 to August 2018. All the patients were analyzed through both CSP and VSP, and all the surgical stents were fabricated through manual and three-dimensional (3D) printing. The predictor variables were the planning method (CSP vs. VSP) and the surgery type (group I: Le Fort I osteotomy + bilateral sagittal split osteotomy [LFI+BSSO] or group II: only bilateral sagittal split osteotomy [BSSO]), and the outcomes were the time and cost. The results were analyzed using the paired t test. Results Thirty patients (12 females, 18 males) met the inclusion criteria, and 17 patients were excluded from the study due to missing or incomplete data. There were 20 group I patients (LFI+BSSO regardless of genioplasty) and 10 group II patients (BSSO regardless of genioplasty). The average time of CSP for group I was 385 ± 7.8 min, and that for group II was 195 ± 8.33 min. The time reduction rate of VSP compared with CSP was 62.8% in group I and 41.5% in group II. On the other hand, there was no statistically significant cost reduction. Conclusions The time investment in VSP in this study was significantly smaller than that in CSP, and the difference was greater in group I than in group II.

Download Full-text

Virtual Surgical Planning Combined With Intraoperative Navigation in Mandibular Bilateral Sagittal Split Osteotomy for Accurate Placement of Patient Specific Implants

Journal of Craniofacial Surgery ◽

10.1097/scs.0000000000007937 ◽

2021 ◽

Vol Publish Ahead of Print ◽

Author(s):

Sanna Järvinen ◽

Juho Suojanen ◽

Anni Suomalainen ◽

Patricia Stoor

Keyword(s):

Surgical Planning ◽

Intraoperative Navigation ◽

Patient Specific ◽

Virtual Surgical Planning ◽

Patient Specific Implants ◽

Sagittal Split Osteotomy ◽

Bilateral Sagittal Split Osteotomy

Download Full-text

Orthognathic Surgery

Operative Plastic Surgery ◽

10.1093/med/9780190499075.003.0058 ◽

2019 ◽

pp. 609-622

Author(s):

Ryan M. Moore ◽

Raj M. Vyas

Keyword(s):

Orthognathic Surgery ◽

Surgical Planning ◽

Preoperative Evaluation ◽

Cephalometric Analysis ◽

Operative Techniques ◽

Virtual Surgical Planning ◽

Bilateral Sagittal Split Osteotomy ◽

Operative Planning ◽

Facial Proportions ◽

Facial Function

Orthognathic surgery restores the facial function and aesthetics affected by skeletal and dental deformities. A comprehensive preoperative evaluation, including cephalometric analysis, is essential to correcting facial skeletal imbalance and asymmetry. Operative planning must account for maxillary-to-mandibular occlusal relationship and dental compensations, as well as facial proportions in all dimensions. Virtual surgical planning has recently emerged as a way to facilitate more precise and accurate surgical planning. Operative techniques used to correct facial skeletal and dental deformities, broadly categorized as maxillary or mandibular excess or deficiency, include the LeFort I osteotomy, bilateral sagittal split osteotomy, and genioplasty.

Download Full-text

Predictability and Accuracy between 3D Virtual Surgical Planning and Actual Outcomes in Orthognathic Surgery

10.53902/mrprs.2021.01.000509 ◽

2021 ◽

Vol 1 (2) ◽

Author(s):

Pampín Martínez MM

Keyword(s):

Orthognathic Surgery ◽

Surgical Planning ◽

3D Models ◽

Free Software ◽

Postoperative Results ◽

Virtual Planning ◽

Postoperative Result ◽

Virtual Surgical Planning ◽

Technological Advances ◽

The Difference

Introduction: We are living a paradigm shift in orthognathic surgery. Several tools and technological advances are being implemented to help improve surgical experience and to offer better functional and aesthetical results. Virtual surgical planning is a revolutionary tool which helps us design the surgical plan preoperatively and establish a surgical protocol specifically designed for that patient. In this study, our goal is to validate the predictability of virtual surgical planning in orthognathic surgery, comparing the final results with the virtual plan. Material and methods: We performed an ICP based super imposition of 3D models of the virtual planning preoperatively designed and the 3D model of the postoperative CBCT using free software (Slicer) in patients who underwent bimaxillary orthognathic surgery. The results of the super imposition were saved on the postoperative model and presented as a color-coded map. This was generated as a .vtk file that was exported to another free software that displayed the difference in mm in relevant cephalometric points (point A, point B, pogonion, left and right gonion and first upper molars) in the three axis (x, y and z) between the postoperative result and the virtual plan. Then, we registered these results for all patients and analysed these data. Results: A total of 41 patients were included. The median of the differences in mm between virtual planning and postoperative results were less than 1mm for all cephalometric points, except for both gonion, where greater than 1mm differences were found in the mediolateral (horizontal) direction. For the rest of landmarks, the highest differences were found at A point and pogonion in the anteroposterior direction (0,83mm and 0,78mm, respectively). Conclusions: We found overall small and tolerable differences (<1mm) between the planned movements and the postoperative results. The highest were found at the gonion in the mediolateral direction and mandibular rami, which could be explained by the torque of the proximal segment. The differences in A point and pogonion in the anteroposterior direction were the highest among the rest, which may be related to inaccuracy of the splint in this direction.

Download Full-text

Seasonal variations in wool growth and heat tolerance of sheep. I. Wool growth

Australian Journal of Agricultural Research ◽

10.1071/ar9600075 ◽

1960 ◽

Vol 11 (1) ◽

pp. 75 ◽

Cited By ~ 9

Author(s):

M Wodzicka

Keyword(s):

Body Weight ◽

Day Treatment ◽

The Other ◽

Seasonal Rhythm ◽

Group Iii ◽

Wool Growth ◽

Group I ◽

The Mean ◽

Group Ii ◽

The Difference

The monthly wool growth of three groups of rams was studied at Beltsville, Maryland. Group I received natural daylight (at 38° 53' N.) and was shorn monthly. Group II had a 7:17 hours of daylight to hours of darkness rhythm and was shorn every 6 months, once in winter and once in summer. Group III received natural daylight and was likewise shorn every 6 months. The rams of all groups produced more wool in summer than in winter. This difference was significant (P<0.001). The mean body weight and food intake were both greater in the winter months, which indicated that the seasonal rhythm of wool growth was not a consequence of poorer feeding in winter. The rams which were shorn monthly (group I) grew considerably more wool than the other two groups, but the difference was not statistically significant. The short-day treatment of group II did not increase the annual wool production nor decrease the seasonal rhythm of wool growth. The balance of evidence from this and other experiments indicates that temperature rather than light controls the seasonal rhythm of wool growth.

Download Full-text

Aminoglycoside trough levels in neonates

Srpski arhiv za celokupno lekarstvo ◽

10.2298/sarh1002050p ◽

2010 ◽

Vol 138 (1-2) ◽

pp. 50-55 ◽

Cited By ~ 1

Author(s):

Biljana Pejovic ◽

Milica Rankovic-Janevski ◽

Niveska Bozinovic-Prekajski

Keyword(s):

Gestational Age ◽

Trough Level ◽

Inverse Correlation ◽

Risk Groups ◽

Target Range ◽

Group I ◽

Significant Difference ◽

Group Ii ◽

The Difference ◽

Trough Levels

Introduction. Drug safety depends on trough levels. Objective. Objective of the study was to measure gentamicin and amikacin trough levels in neonates and to identify risk groups by gestational and postnatal age. Methods. Gentamicin and amikacin were applied according to the clinical practice guidelines. Trough levels (mg/l) were deter- mined using fluorescence polarization immunoassay methodology. Target trough levels were <2 mg/l for gentamicin, and <10 mg/l for amikacin. Patients were divided in 3 groups by gestational age: I ?32, II 33-36, and III ?37 gestational weeks and, by postnatal age, in 2 groups: ?7 and >7 days. Results. Out of 163 neonates, 111 were receiving gentamicin and 52 amikacin. Mean amikacin trough level was 7.8?4.8 mg/l and, in group I 10.5?4.9 mg/l, which was above the target range and significantly higher than in group II (LSD, p<0.05). In the amikacin group, 26 patients were 7 and less, and 26 more than 7 days old, without significant differences in trough levels between the groups. In the gentamicin group, 52.3% of neonates had trough values within the target range. Gentamicin trough level in group I was above the trough range, 3.7?1.8, 2.3?1.5 in group II and, 1.8?1.4 mg/l in group III. The difference in trough levels among the groups was highly significant (F=9.015, p<0.001, ?2=17. 576, p<0.001). Further analysis revealed that differences between groups I and II (LSD, p=0.002) and between I and III (LSD, p=0.000) were highly significant. Conclusion. Obtained gentamicin and amikacin trough levels are high. Inverse correlation has been confirmed between trough level and gestational age, with highly significant difference, and the risk group has been identified. There is obviously a need to change the dosing regimen in terms of those with extended intervals, particularly for neonates of the lowest gestational age, along with pharmacokinetic measurements.

Download Full-text

Contemporary management of idiopathic condylar resorption utilising virtual surgical planning and single stage, bilateral, custom TMJ replacement with or without concurrent orthognathic surgery

British Journal of Oral and Maxillofacial Surgery ◽

10.1016/j.bjoms.2013.05.037 ◽

2013 ◽

Vol 51 (6) ◽

pp. e88-e89

Author(s):

Jonas Osher ◽

L. Gillman ◽

N.S. Matthews

Keyword(s):

Orthognathic Surgery ◽

Surgical Planning ◽

Single Stage ◽

Virtual Surgical Planning ◽

Contemporary Management

Download Full-text

NORMALAND ABNORMAL LIQUOR VOLUME AND ITS CORRELATION WITH PERINATAL OUTCOME

10.36106/ijsr/7938740 ◽

2021 ◽

pp. 4-6

Author(s):

Kumari Nisha ◽

Renu Jha ◽

Kumudini Jha ◽

Debarshi Jana

Keyword(s):

Apgar Score ◽

Perinatal Outcome ◽

Neonatal Intensive Care ◽

Fetal Distress ◽

Special Unit ◽

Group I ◽

Group Ii ◽

The Difference ◽

One Year ◽

Four Quadrant

Aim:To assess and compare the perinatal outcome among mothers with normal and abnormal amniotic uid volume. Method: A prospective comparative study was conducted for a period of one year from January 2020 to December 2020. Group I consist of 50 patients with normal amniotic uid and group II consists of 50 patients with either oligohydramnios or polyhydramnios. Amniotic uid index (AFI) was calculated using Phalen's four quadrant technique using ultrasound. The perinatal outcome was judged by assessing the fetal distress predicted by abnormal fetal heart rate (FHR) or meconium stained liquor, one minute and 5 minute Apgar score, frequency of admission to neonatal intensive care unit (NICU), baby weight of less than 10th percentile for gestation age and perinatal mortality. Results: Induction of labour, caesarean section and meconium stained liquor was found to be most common among the patients in group II (abnormal AFI) in comparison with normal AFI subjects and similarly the perinatal outcome measures like low birth weight, increased frequency of admission to NICU due to respiratory distress and a low APGAR score was more commonly found in abnormal AFI group and the difference was found to be statistically signicant. Conclusion: AFI measurement in antepartum or intrapartum period can help to identify women who need increased antepartum surveillance for pregnancy complications and such women should be managed in a special unit to combat the complications effectively.

Download Full-text