The Reliability and Validity of the Measurements in Unilateral Cleft Lip and Palate Laser Scanned 3D Dental Casts

A total of 30 dental casts of unilateral cleft lip and palate (UCLP) children with 90 linear variables were measured using digital caliper while the laser-scanned 3D dental casts (LS3DM) were measured using Mimics Software. All scanned data coordinates (in x, y, z) were transferred into Mimics software in STL format to be measured. All the variables were measured using a computer mouse accurate to 0.5 mm. The intra-class correlation coefficient (ICC) was used to evaluate the intra- and inter-examiner reliabilities and also for the validity of two methods

Results:

Intra-examiner reliabilities of digital caliper and LS3DM were found excellent (ICC 0.916-0.995) and inter-examiner reliabilities of LS3DM were good to excellent (ICC 0.816-0.990). The validity of LS3DM measurements was confirmed based on the ICC values were in the range of 0.913-0.996. The overall time frame for conducting measurements was shorter using a laser-scanned model (10 min.) than using a digital caliper (5 hours)

Conclusion:

The LS3DM is a valid reliable tool for future high impact research in our institution.

Keywords:
Measurements, Methods and Theories; Reproducibility of Results; Cleft Lip

Variables		Intraclass Correlation^b	95% Confidence Interval		F Test with True Value 0
Variables		Intraclass Correlation^b	Lower Bound	Upper Bound	Value	df1	df2	p-value
ICW	Single Measures	0.995^a	0.987	0.998	417.061	18	18	<0.001
IMW	Single Measures	0.993^a	0.985	0.997	269.873	29	29	<0.001
AD	Single Measures	0.916^a	0.832	0.959	22.234	29	29	<0.001

Variables		Intraclass Correlation^b	95% Confidence Interval		F Test with True Value 0
Variables		Intraclass Correlation^b	Lower Bound	Upper Bound	Value	df1	df2	p-value
ICW	Single Measures	0.987^a	0.968	0.995	155.644	18	18	<0.001
IMW	Single Measures	0.990^a	0.980	0.995	202.254	29	29	<0.001
AD	Single Measures	0.916^a	0.471	0.974	45.818	29	29	<0.001

Variables		Intraclass Correlation^b	95% Confidence Interval		F Test with True Value 0
Variables		Intraclass Correlation^b	Lower Bound	Upper Bound	Value	df1	df2	p-value
ICW	Single Measures	0.986^a	0.958	0.995	169.973	18	18	<0.001
IMW	Single Measures	0.990^a	0.980	0.995	209.834	29	29	<0.001
AD	Single Measures	0.816^a	0.271	0.936	17.937	29	29	<0.001

Variables		Intraclass Correlation^b	95% Confidence Interval		F Test with True Value 0
Variables		Intraclass Correlation^b	Lower Bound	Upper Bound	Value	df1	df2	p-value
ICW	Single Measures	0.996^a	0.990	0.999	514.685	18	18	<0.001
IMW	Single Measures	0.995^a	0.975	0.998	622.341	29	29	<0.001
AD	Single Measures	0.913^a	0.801	0.961	26.213	29	29	<0.001

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[1] Author to whom correspondence should be addressed: Assoc. Prof. Dr. Mohd Fadhli Khamis, Oral Biology and Forensic Odontology Unit, School of Dental Sciences, Universiti Sains Malaysia, Health Campus, 16150 Kubang Kerian, Kota Bharu, Kelantan, Malaysia. Phone: +60 9 7675500. E-mail: fadhli@usm.my.