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Figure 1: Division of the occlusal fissure system on permanent mandibular 1st molar for classification of sites of loss of sealant M=Mesial site, D=Distal site, B=Buccal site, K=Central site, L=Lingual site

Figure 1: Division of the occlusal fissure system on permanent mandibular 1<sup>st</sup> molar for classification of sites of loss of sealant <i>M</i>=Mesial site, <i>D</i>=Distal site, <i>B</i>=Buccal site, <i>K</i>=Central site, <i>L</i>=Lingual site