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Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT04987190
Other study ID # 201600968A3
Secondary ID
Status Completed
Phase
First received
Last updated
Start date January 25, 2021
Est. completion date July 4, 2021

Study information

Verified date August 2021
Source Chang Gung Memorial Hospital
Contact n/a
Is FDA regulated No
Health authority
Study type Observational

Clinical Trial Summary

The patients with unilateral and bilateral cleft lip and palate received alveolar bone graft surgery. Two time points of cone beam CT were taken for all the patients: post-operative 6 months, and post-operative 2 years. All the CT images were reviewed for the analysis of grafted bone density.


Description:

Patient Information and Data Collection Patients who had nonsyndromic unilateral or bilateral cleft lip and alveolus with or without cleft palate and received ABG at our center between 2016 and 2018 were enrolled. All patients underwent at least 2 CBCT scans after operation. Postoperative image acquisition was performed at two time points, namely 6 months (T1) and 2 years (T2) after ABG. The ABG procedures for all patients were performed by the same senior surgeon per the protocol of our center, which comprises an iliac cancellous bone graft and the sealing of the Scarpa fascia to the defect before the bone graft is packed.2,12 Patient who had syndromic cleft alveolus, who underwent two-stage ABG (performed for bilateral cases), or who exhibited failed grafted tissue were excluded. In total, 40 patients were enrolled in the present study. The demographic and clinical variables for ABG were retrospectively collected through a review of medical charts. All CBCT images were obtained using an i-CAT CBCT scanner (Imaging Sciences International, Hatfield, PA, USA); the parameters for the images are as follows: 120 kVp, voxel size of 0.4 × 0.4 × 0.4 mm3, 40-s scan time, and 22 × 16-cm field of view. BMD Measurement The Picture Archiving and Communication System (PACS) was applied for image analysis. In addition, areas of interest were checked in the axial view slice by slice to locate the grafted tissue. Three methods (A, B, and C), which differed by the size of the selected area, were designed to measure Hounsfield units (HU). For all methods, we first identified the most superior and inferior planes transecting the grafted tissue. Subsequently, the middle plane of the grafted tissue was identified. For the selected plane, the distance between two teeth had to be larger than 2.5 mm in diameter; this was required for all three methods. On each plane, the selected circular area is defined as being located at the midpoint of the line between the centers of the two adjacent teeth. The HU of the selected area could be obtained using PACS. For Method A, the circular zone located 1 mm from the adjacent teeth was selected. For Method B, the largest circular zone that exactly transected the two adjacent teeth or was tangent to the surrounding cortical bone was selected. For Method C, a circle was drawn with a diameter of 2 mm. Furthermore, an area of 2 × 0.5 mm2 in the pogonion was selected to obtain its HU at T1 and T2; this was the reference for calibration (Figure, Supplemental Digital Content 1). HU was the reference for BMD13 and represented the average density of the three planes. Calibrated BMD (BMDc, %) was defined using the following formula: 〖BMD〗_c (%)=〖HU〗_(selected zone)/〖HU〗_pogonion ×100. Density enhancement rate (%) was calculated using the following formula: Density enhancing rate (%)= (〖BMD〗_cT2-〖BMD〗_cT1)/〖BMD〗_cT1 ×100, where BMDcT2 is BMDc measured at T2, and BMDcT1 is the BMDc at T1. All the BMD and pogonion density data were measured by one examiner and repeated twice on different dates that were separated by a 3-month interval; the second round of measurements was conducted without reference to the first-round measurements. The average of the six sets of data (two measurements for each of the three planes) was used for the final statistical analysis. Statistical Analysis In the descriptive analysis, continuous variables were summarized by means ± standard deviations. All variables were examined for normal distribution using the Shapiro-Wilk test. Student's t-test was performed to compare the means of continuous variables with normal distribution, and a chi-squared test or Fisher's exact test was used for categorical data. Furthermore, we performed analysis of variance with repeated measures to compare the differences between the three methods with respect to BMDc measurements and density enhancement rates in normally distributed data; for data that were not normally distributed, Friedman test was used. To compare the differences in BMDc at T1 and T2, we performed a paired t-test and a Wilcoxon signed-rank test for bilateral cleft due to small sample size. Bland-Altman plots were used to evaluate the agreement of each method. Intrarater reliability for the three methods was calculated using intraclass correlation coefficients (ICCs). All statistical tests were two-tailed, and a p value less than 0.05 was considered statistically significant. All data were analyzed using SPSS 24.0 (SPSS, Chicago, IL, USA).


Recruitment information / eligibility

Status Completed
Enrollment 40
Est. completion date July 4, 2021
Est. primary completion date June 2, 2021
Accepts healthy volunteers No
Gender All
Age group 8 Years to 10 Years
Eligibility Inclusion Criteria: - Patients who had nonsyndromic unilateral or bilateral cleft lip and alveolus with or without cleft palate - Patients received alveolar bone graft at their 9 years of age - Patients received twice CBCT after the surgery Exclusion Criteria: - Patient had syndromic cleft alveolus - Patient underwent two-stage ABG (performed for bilateral cases) - Patient exhibited failed grafted tissue

Study Design


Related Conditions & MeSH terms


Intervention

Procedure:
alveolar bone graft
alveolar bone graft with Scarpa fascia done when patients were at 9 year of age

Locations

Country Name City State
Taiwan Chang Gung Memorial Hospital Taoyuan

Sponsors (1)

Lead Sponsor Collaborator
Chang Gung Memorial Hospital

Country where clinical trial is conducted

Taiwan, 

Outcome

Type Measure Description Time frame Safety issue
Primary mean calibrated bone mineral density (BMD/pogonion density, BMDc) BMD presented from CBCT 1st BMD at post-operative 6 months
Primary mean calibrated bone mineral density (BMD/pogonion density, BMDc) BMD presented from CBCT 2nd BMD at post-operative 2 years
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