Association of physical properties and maintenance of sterility of primary teeth in human tooth bank

Evaluation of Immediate and Delayed Microleakage of Class V Cavities Restored with Chitosan-incorporated Composite Resins: An In Vitro Study

Aim and objective

To evaluate and compare the microleakage of unmodified microhybrid composite and 0.2% chitosan-incorporated composite in class V cavities restored immediately and after 3 months of storage in artificial saliva.

Materials and methods

Sixty human permanent maxillary premolars were collected and standardized class V cavity prepared on the buccal surface of each tooth with dimensions: mesiodistally 3 mm, occluso cervically 2 mm, and depth of 1.5 mm and restored with microhybrid composite and chitosan-incorporated composite resins respectively and randomly divided: Group I: control-microhybrid composite (n = 30): (a) 15 teeth tested immediately (b) 15 teeth tested after 3 months. Group II–restored with chitosan + composite (n = 30): (a) 15 teeth tested immediately (b) 15 teeth tested after 3 months. Specimens were stored in artificial saliva following which a dye extraction test was carried out using a spectrophotometer.

Results

There was no statistically significant difference in microleakage score between the chitosan-composite group and unmodified composite group when evaluated immediately after placing the restoration. Microleakage values of the unmodified composite group increased significantly after 3 months of storage in artificial saliva and values of the chitosan-composite group did not differ significantly even after 3 months of storage. Microleakage was seen significantly less in the chitosan-composite group compared to the unmodified composite group after 3 months of storage in artificial saliva.

Conclusion

It can be concluded that chitosan-incorporated composite seems to have improved mechanical properties and forms a more stable bond when compared with unmodified microhybrid composite in addition to being antibacterial.

Clinical significance

Considering the advantageous properties of this material, it may be clinically useful in restoring class V cavities in patients with high caries risk. However, further in vitro and in vivo studies need to be carried out.

How to cite this article

Deb A, Pai V, Nadig RR. Evaluation of Immediate and Delayed Microleakage of Class V Cavities Restored with Chitosan-incorporated Composite Resins: An In Vitro Study. Int J Clin Pediatr Dent 2021;14(5):621–627.

Clinical Evaluation of Restoration of Grossly Carious Primary Teeth Using Biological Approach

BACKGROUND

To widen the treatment option of primary teeth with mutilated crown tooth structure but having more than two-thirds of root structure were restored by using natural tooth crowns with the help of adhesive materials.

AIM AND OBJECTIVE

To restore the grossly decayed primary molars with biological crowns and to evaluate them for longevity, change in color, occlusal wear, marginal integrity, and patient/parent acceptance.

MATERIALS AND METHODS

Twenty primary molars from 6 to 10 years old children were restored with biological crowns (extracted/exfoliated tooth crowns) and follow-up was done till 12 months. Data tabulated and results were statistically analyzed using Kaplan-Meier survival analysis. The statistical software SPSS 19.0 was used.

RESULTS

89.47% of biological restorations survived successfully till 12 months follow-up period. No occlusal wear was found in any of the samples, a breach in marginal integrity was seen only in 16.6% of cases, and only 5.5% of biological crowns showed discoloration (darker) at 12 months intervals. 65.00% of patients well accepted the treatment and showed satisfaction while 20.0% of patients remained neutral. Only 15% of patients experienced dissatisfaction at the end of the study.

CONCLUSION

Biological restorations proved to be a viable alternative for the restoration of grossly mutilated primary molars.

HOW TO CITE THIS ARTICLE

Singh P, Srivastava N, Rana V, et al. Clinical Evaluation of Restoration of Grossly Carious Primary Teeth Using Biological Approach. Int J Clin Pediatr Dent 2020;13(S-1):S55-S63.

Human teeth biobank: Microbiological analysis of the teeth storage solution

The cross-infections may occur during handling of dental elements, affecting the health of dental practitioners and researchers. This study aimed to analyze the influence of the storage medium temperature on the bacterial contingent of the human teeth used for research purposes. Thirty human teeth were donated to the Human Teeth Biobank immediately after extraction. The teeth were cleaned with tap water and neutral soap. The teeth were randomly distributed according to the temperature of the storage solution (deionized water): at 4 °C (refrigerator) or at -10 °C (freezer) and were stored individually in sterile vials during 60 days. After this period, a microbiological analysis (CFU/mL) of the storage solutions was performed and teeth were submitted to SEM analysis. Data were analyzed by Kruskal-Wallis test followed by Dunn's post-test (p ≤ .05). Total aerobic bacteria ranged from 5.8 to 8.4 log₁₀ CFU/mL for refrigerated solution and from 1.9 to 8.5 log₁₀ CFU/mL for frozen solution. No statistical differences were found between the storage solutions (p > .05). The counts of Streptococcus spp., Lactobacillus spp., and Staphylococcus spp. were similar for both storage solutions (p > .05). SEM analysis showed spiral- and rod-shaped bacteria attached on teeth stored under 4 °C, which may suggest the presence of Treponema spp. and Lactobacillus spp. Similar morphological forms were found on teeth stored under -10 °C. A biofilm organized in honeycomb-like form was found in the frozen teeth. Cocci were eventually found in all the samples. It was concluded that bacterial growth and survival were not influenced by the temperature of the teeth storage solution.