The Substantiation of the Pre-Polymerization Heating Efficiency of the Dental Nanocomposite Material

Zurab Khabadze,Saida Abdulkerimova,Yunus Bakaev,Oleg Mordanov,Shamil Solimanov,Georgy Davreshyan,David Todua,Alena Kulikova,Yusup Bakaev,Shamil Nazhmudinov,Anzhela Adzhieva

doi:10.1590/pboci.2020.139

Abstract

Objective: To evaluate the effect of pre-polymerization heating of nanocomposite filling materials on their strength properties within one manufacture group. Material and Methods: Two nanocomposite filling materials Enamel Plus HRi Universal Dentin ® and Universal Enamel ® were used. The linear thermal expansion coefficient (LTEC), Young's modulus and penetration depth were determined during the tests. Changes in the structure of materials were evaluated using electron scanning microscopy . Results: Dentin nanocomposite samples after pre-heating and polymerization have higher LTEC after 30°C compared to dentine nanocomposite untreated samples with statistically significance started at 62 °C (p<0.05) and higher temperature. Pre-polymerization heated samples had a statistically higher LTEC (p<0.05) at 57 ° С . It was revealed that Young's modulus of the dentin nanocomposite samples after thermal processing at 55°C was higher in total after the first heating cycle by 15% compared to the untreated dentin nanocomposite samples (p<0.05). The volume of total porosity after pre-heating decreased to 5-7% (p<0.05) . Conclusion: The material that has undergone preliminary heat processing is significantly less deformed under load than the material that does not have thermal processing during the research was established and also has a denser structure.

Highlights

The changes in composite resin fillers have resulted in improvements in the physical, mechanical, and esthetic properties of these materials [1]
It was revealed that Young's modulus of the dentin nanocomposite samples after thermal processing at 55°C was higher in total after the first heating cycle by 15% compared to the untreated dentin nanocomposite samples (p
Integr. 2020; 20:e0030 The analysis of the results revealed that linear thermal expansion coefficient (LTEC) is different between the samples with preliminary thermal processing and the untreated samples

Summary

Introduction

The changes in composite resin fillers have resulted in improvements in the physical, mechanical, and esthetic properties of these materials [1]. Nanosized fillers have been introduced to improve the mechanical properties of such resins [2]. The successful clinical handling and placement mainly depend on suitable pre-cure properties of composites [3]. Pre-cure handling properties, such as flowability, stickiness, ease of placement and adaptation to cavity walls affect product selection for clinical restoration [4,5]. As well, improving composite-to-tooth bond strength has been the objective of many recent dental researches [6]. Preheating makes resin-based composites more fluid and easier to manipulate, without compromising their superior mechanical properties [10]. Enhanced flowability can be advantageous in achieving a better adaptation to the cavity walls [11,12,13,14,15]

Methods

Results

Conclusion