Effect of grit size of diamonds on the dentinal surface
Objective: 1. To find out the correlation between the roughness of diamonds and roughness created on dentin after tooth preparation
2. To measure the surface roughness of dentin after tooth preparation with different grit sizes of diamond
Methodology: Extracted human molar teeth were used in the study. The enamel from buccal, lingual and occlusal surface of the teeth was sectioned. The remaining dentinal surface was prepared into a rectangular area. The specimens were divided into four groups based on the final grit size of the rotary cutting instruments used. The roughness of diamonds was measured before preparation using contact profilometer. For the coarse group (CG), specimens were prepared with a coarse grit diamond. For the medium group (MG), specimens were prepared with a coarse grit instrument followed by a medium-grit
diamond. For the fine group (FG), specimens were prepared in the sequence from coarse, medium to fine grit size instruments. For the extra fine group (EFG), the specimens were prepared in the sequence from coarse, medium, fine to extra fine grit size instruments. The surface roughness (Ra) of the prepared
specimens was then evaluated with a profilometer. Pearson correlation test was done to find out the correlation between the roughness of diamonds and roughness created on dentin.
Result: There is positive correlation (r=0.93) between the roughness of diamonds and roughness created on the dentin. Coarse diamonds which had a surface roughness of 10.6 μm produced surface roughness of 3.83 μm on the dentine. Similarly 8.3 μm medium grit diamonds produced 2.61 μm, 6.1 μm fine diamonds produced 1.64 μm and 2.5 extra fine diamonds produced 0.68 μm surface roughness on dentine.
Conclusion: There is a positive correlation between the surface roughness of diamond points and that of the dentin surface it creates. This correlation brings in predictability of the surface roughness of prepared tooth.
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