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Table 1 Frequency distribution of four types of crestal and radicular dentoalveolar phenotype (CRDAP) of investigated teeth in the anterior mandibular region

From: Risk assessment of labial bone perforation in the anterior mandibular region: a virtual immediate implant placement study

  Total CRDAP Class I CRDAP Class II CRDAP Class III CRDAP Class IV  
Variables n n % n % n % n % p
Side           0.487
 Right 447 44 9.8 92 20.6 46 10.3 265 59.3  
 Left 447 53 11.9 76 17.0 47 10.5 271 60.6  
Tooth type           < 0.001
 Central incisor 298 58 19.5 56 18.8 26 8.7 158 53.0  
 Lateral incisor 298 25 8.4 74 24.8 31 10.4 168 56.4  
 Canine 298 14 4.7 38 12.8 36 12.1 210 70.5  
Side and tooth type           < 0.001
 Central incisor, right 149 24 16.1 31 20.8 13 8.7 81 54.4  
 Central incisor, left 149 34 22.8 25 16.8 13 8.7 77 51.7  
 Lateral incisor, right 149 13 8.7 38 25.5 16 10.7 82 55.0  
 Lateral incisor, left 149 12 8.1 36 24.2 15 10.1 86 57.7  
 Canine, right 149 7 4.7 23 15.4 17 11.4 102 68.5  
 Canine, left 149 7 4.7 15 10.1 19 12.8 108 72.5  
Total 894 97 10.9 168 18.8 93 10.4 536 60.0  
  1. The classification of crestal and radicular dentoalveolar phenotype (CRDAP) of mandibular anterior teeth was categorized according to the thickness of dentoalveolar bone at both crestal and radicular zones [25]. The chi-square tests were used for comparing the distribution of CRDAP in different “side,” “tooth type,” and “side and tooth type,” respectively. The level of statistical significance was set at p < 0.05