The Experimental Study Of Primary Teeth Of Chemo-mechnical Caries Removal Method

Because of the children psychologic characteristics and primary teeth features, the treatment for primary teeth should be atramatic and low voices. The Carisolv chemo-mechnical caries removal method is such a minimal traumatic method for caries removal. The study aimed to evaluate the therapeutic effect of caries removal with Carisolv by scanning electron micrograph, light microgrph, tensile bond strength test, bacteriology and clinical effect.I : The SEM observation of primary teeth chemo-mechnical caries-removalObjective: To compare the different dentine surface characteristics of the primary teeth prepared with Carisolv and conventional drilling by scanning electron microscope (SEM). Methods: Twelve carious primary molars were randomly divided into three groups, i.e., control group, conventional drilling group and Carisolv group. There were four teeth in each group. All teeth were observed by scanning electron microscope (SEM). Results: The dentine surface characteristics in control group showed anomaly dentine structure with some detritus and residuum. The dentinal tubules were not completely exposed. The characteristics of the drilling group appeared the well-defined smear layer throughout the surface area. The dentine tubule orifices were plugged. The cavity surface of the Carisolv group showed that the smear layer was consistently removed and the dentinal tubules of carious area were sufficient exposed. Conclusion: The primary teeth caries removal effect of Carisolv group was more excellent than that of conventional drilling group.II: The light micrograph observation of primary teeth chemo-mechnical caries removalObjective: To compare the caries removal effect of primary teeth with Carisolv and conventional drilling by light micrograph. Methods: Nine extracted carious primary teeth were randomly divided into three groups, i.e., control group, conventional drilling group and Carisolv group. The teeth were finished into ground sections, examined by light micrograph. Results: Convention drilling completely removed the caries, so did Carisolv. Conclusion: Carisolv can effectively remove the primary dentine caries.III: The micro-tensile bond strength test of resin to caries removal dentin of the primary teeth by CarisolvObjective: To compare the micro-tensile bond strength of resin fillings to caries removal dentin of the primary teeth by Carisolv or contentional method. Methods: Thirty freshly extracted primary teeth with dentine caries were collected and randomly divided into two groups, i.e., conventional drilling group and Carisolv group. There were fifteen teeth in each group. Each tooth was treated with self-etching bonding agent (Contax) and restored with composite resin. Micro-tensile bond strength was measured. Results: There was no significant difference in bond strength between these two groups (P>0.05). Conclusion: Carisolv caries removal method has no negative effect on micro-tensile bond strength of resin to caries removal dentin of the primary teeth.IV: The bacteriological and clinical effect evaluation of primary teeth chemo-mechnical caries removalObjective: To compare the bacteriological features, the clinical effect of chemo-mechanical caries removal with conventional excavation. Methods: 40 carious deciduous molar teeth were collected and randomly divided into two groups, i.e., conventional drilling group (by bur) and Carisolv group. There were twenty teeth in each group. Samples from carious dentine were taken with a sterile scraping instrument. All softened dentine was removed and a second sample was taken. All samples were serially diluted and cultivated on four different nutrient agar plates, and counted. In clinic procedure, treatment time was measured. Patient's acceptance of pain, smell was evaluated. The restorations were reevaluated 6 months after treatment. Results: Both methods produced a statistically significant reduction in bacterial counts after caries removal, except actinomyces in conventional drilling group. There was significant decrease of the total bacteria in Carisolv group than conventional drilling group (by bur) (P<0.01). Eighty percent participants were pain-free by Carisolv treatment and accepted the smell of Carisolv. The average treatment time were 8.75±3.30 min in Carisolv group and 4.85±3.36 min in conventional drilling group (P<0.01). There was no significantly difference in fillings lost and secondary caries between two groups within half year. Conclusion: The Carisolv chemo-mechanical method is relatively more effective and time-consuming than conventional methods.Through these experiments, Carisolv chemo-mechnical caries removal method is minimal traumatic, pain-free, acceptable by children patients to provid valuable imformation for extending the use of this method.