الفهرس 
Accuracy of arch analysis in mixed dentition using digital study models versus the plaster models using Tanaka and Johnston prediction equation: (A diagnostic accuracy study)
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Abstract
This is a diagnostic accuracy study that was carried out to assess accuracy between digital models and plaster models through Tanaka and Johnston prediction equation.
Study population included 16 patients in the early mixed dentition stage with erupted lower permanent incisors who were selected according to the eligibility criteria. They were selected from Pediatric Dentistry Department at Faculty of Dentistry, Cairo University. After an informed consent was taken by their parents, impressions of the upper and lower arches of all participating children were taken. The impressions were poured immediately and measurements were done to calculate the required space through Tanaka and Johnston prediction equation using digital caliper. Same casts were scanned and also required space was calculated using digital models through 3shape ortho-analyzer. All measurements were repeated by the 2nd examiner.
The results of the current study showed that:
1. A statistically significant difference was found between (3D models) and (2D models) where (p=0.001).
2. The highest mean value of space required was found in (2D models) group with total mean ± standard deviation (21.12±0.58) for maxilla and (20.66 ±0.59) for mandible and the least mean value of space required was found in (3D models) group with total mean ±standard deviation (20.84±0.65) for maxilla and (20.33±0.65) for mandible.
3. Strong reliability and agreement between two readings in the maxillary required space with ICC= 0.964 in 3D models and 0.920 in 2D models for maxilla, and ICC = 0.964 in 3D models and 0.948 in 2D models for mandible.
4. Measurement’s error between 3D models and 2D models was calculated with total mean ± standard deviation (0.29±0.29) for maxilla, and (0.32±0.33) for mandible.