TY - JOUR ID - TI - The laboratory dental cutting rates in comparison with the clinical dental cutting rates and the cutting rates on a new suggested training block AU - Angham Ghiath Al-Hashimi انغام غيث الهاشمي PY - 2012 VL - 24 IS - 1 SP - 1 EP - 5 JO - Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد SN - 18171869 23115270 AB - Background: Preclinical cavity preparation performed in the laboratory on different types of typodont mannequinteeth that keep changing in chemistry and properties by the manufacturer ,while clinical cavity preparationperformed on natural teeth of well known chemistry and properties without a transitional format, the aim of thisstudy was to compare the laboratory dental cutting rates with the clinical dental cutting rates and the cutting rateson a new suggested transitional training blockMaterials and methods: the cutting rates were evaluated on 30 artificial teeth and 30 natural teeth the roots weresectioned and the crowns were embedded in acrylic blocks (25x25x15 mm) exposing the flat labial surface, thespecimens were divided according to the cutting equipment and the type of the exposed labial surfaces into:Group 1: the previous laboratory dental cutting (10 original Frasaco/Nissin dental product)Group 2: the current laboratory dental cutting (10 Frasaco Dent Iran)Group 3: dental cutting on anew suggested training block (10 denture teeth –Pigeon teeth China)Group 4: low speed clinical dental cutting (10 dentin specimens)The cutting was performed in all the above groups with stainless steel fissure bur and low speed hand pieceGroup 5: high speed clinical dental cutting on dentin (10 dentin specimens)The cutting was performed with carbide fissure bur and turbineGroup 6: high speed clinical dental cutting on enamel (10 enamel specimens)The cutting was performed with diamond fissure bur and turbine.The cutting rates (mm/sec)were recorded and statistically analyzed using ANOVA test and t-testResults: the results showed there was no significant difference between group 3and the mean of the clinical dentalcutting (group 4, 5&6),a significant differences were presented between group 1Vs group 3 and between group 1 Vsthe mean of the clinical dental cutting(group 4,5&6),while group 2 showed a highly significant difference Vs group 1and a very highly significance difference Vs group 3 and the mean of the clinical dental cutting(group 4,5&6)Conclusion: The previous laboratory dental cutting was much closer to the clinical dental cutting (slightly slower)While the current laboratory dental cutting far away (too fast)from the clinical dental cutting .Furthermore the dentalcutting on the new suggested training block comparable to the clinical dental cutting

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