Table 1. The extraction socket size of the mandibular first molar.

Teeth	N	MD-SS	BL-SS
Total	140	8.74 ± 0.76	8.26 ± 0.72
Left mandibular first molar	75	8.73 ± 0.75	8.19 ± 0.70
Right mandibular first molar	65	8.74 ± 0.78	8.34 ± 0.73

N: number of the teeth; MD-SS: mesial-distal socket size; BL-SS: buccal-lingual socket size.