Non-surgical endodontic management of immature permanent mandibular first molar: a 3 year follow-up

Comparison of three different biomaterials used in in vitro molar apexification models

OBJECTIVES

New biomaterials had some advantages such as mixing and easier application as compared to traditional MTA in single step apexification method. This study aimed to compare the three biomaterials used in the apexification treatment of immature molar teeth in terms of the time spent, the quality of the canal filling and the number of x-rays taken to complete the process.

METHODS

The root canals of the extracted thirty molar teeth were shaped with rotary tools. To obtain the apexification model, ProTaper F3 was used retrograde. The teeth were randomly assigned into three groups based on the material used to seal the apex; Group 1: Pro Root MTA, Group 2: MTA Flow, Group 3: Biodentine. The amounts of the filling, the number of radiographs taken until treatment completion and the treatment duration were recorded. Then teeth were fixed for micro computed tomography imaging for quality evaluation of canal filling.

RESULTS

Biodentine was superior to the other filling materials according to time. MTA Flow provided greater filling volume than the other filling materials in the rank comparison for the mesiobuccal canals. MTA Flow had greater filling volume than ProRoot MTA in the palatinal/distal canals(p = 0.039). Biodentine had greater filling volume more than MTA Flow in the mesiolingual/distobuccal canals (p = 0.049).

CONCLUSIONS

MTA Flow was found as a suitable biomaterial according to the treatment time and quality of root canal fillings.

ANALYSIS OF DENTAL CARIES IN THE PERMANENT FIRST MOLARS AND RELATED FACTORS WITH CHILDREN AGED 10–12 YEARS IN SOUTHERN CHINA

In order to investigate and analyze the caries status of permanent first molars (PFMs) in children aged 10 to 12 years in Southern China and to analyze the related factors, from January to August 2019, a multi-stage, stratified, cluster, and random sampling method had been used to select 6208 children from 22 schools in Guangzhou city for oral health examinations and questionnaires. The total caries rate of the PFMs was 39.40%, total DMFT score was [Formula: see text], the filling rate of caries was 3.38%, and the rate of fissure sealant was 5.89%. The percentage of PFM caries was statistically significant between female and boys, urban and rural areas, only-children and non-only children, and between ethnic minorities and Han ethnic groups ([Formula: see text]). The difference between urban and rural areas was statistically significant ([Formula: see text]). Multivariate logistic regression analysis showed that the number of daily toothbrushes, the number of desserts eaten, milk drinking before bedtime, being the only-child, and the parents’ level of education were the independents influencing the factors of for developing dental caries. The incidence of dental caries in the PFMs of children aged 10–12 years in Southern China is high, and the rate of fissure sealant and the rate of dental fillings are low. There are a lot of differences between urban and rural areas, where children’s oral health knowledge is poor, and poor oral hygiene behaviors and dietary habits exist.