Diş Hekimliğinde, Bentonitin Diş Dolguların Mekanik Özelliklerinin Arttırılması İçin Kullanımı

Yakın tarihli bir çalışmada, Bentonit (Montmorillonit) Nanokili ve Acrylic Asit birleştirilerek daha sağlam diş dolgularının oluşturulması ve denenmesi amaçlanmıştır. Yapılan çalışmada, montmorillonitin çok az miktarda eklenmesi ile bile oldukça iyi sonuçlar elde edilmiş,

Bentonit (Montmorillonit) nanokili ile yüksek kesme yapışma gücü sağlanmış, nanopartiküllerin seyreltik yapıştırıcılarda dağılma stabilitesi 25 kat artmıştır. Çalışmanın öneminde ise, sentezlenen yapının mekanik özelliklerinin geliştirildiği belirtilmiştir.

Bu Makalenin İngilizce özeti aşağıda verilmiştir.

Poly(acrylic Acid) Grafted Montmorillonite As Novel Fillers For Dental Adhesives: Synthesis, Characterization And Properties Of The Adhesive Laleh Solhia, Mohammad Ataia, Azizollah Nodehia, Mohammad Imania, Azadeh Ghaemib, Kazem Khosravic Iran Polymer and Petrochemical Institute (IPPI), P.O. Box 14965/115, Tehran, Iran, Dental School, Jondishapour University of Medical Sciences, Ahwaz, Iran, Dental School, Isfahan University of Medical Sciences, Isfahan, Iran
PMID: 22169675 [PUBMED – indexed for MEDLINE] Elsevier, Volume 28, Issue 4, April 2012, Pages 369–377
Abstract
Objective:This work investigates the graft polymerization of acrylic acid onto nanoclay platelets to be utilized as reinforcing fillers in an experimental dental adhesive. Physical and mechanical properties of the adhesive and its shear bond strength to dentin are studied. The effect of the modification on the stability of the nanoparticle dispersion in the dilute adhesive is also investigated.
Materials and methods: Poly(acrylic acid) (PAA) was grafted onto the pristine Na-MMT nanoclay (Cloisite® Na+) through the free radical polymerization of acylic acid in an aqueous media. The resulting PAA-g-nanoclay was characterized using FTIR, TGA and X-ray diffraction (XRD). The modified nanoclays were added to an experimental dental adhesive in different concentrations and the morphology of the nanoclay layers in the photocured adhesive matrix was studied using TEM and XRD. Shear bond strength of the adhesives containing different filler contents was tested on the human premolar teeth. The stability of nanoclay dispersion in the dilute adhesive was also studied using a separation analyzer. The results were then statistically analyzed and compared.
Results: The results confirmed the grafting reaction and revealed a partially exfoliated structure for the PAA-g-nanoclay. Incorporation of 0.2 wt.% of the modified nanoclay into the experimental adhesive provided higher shear bond strength. The dispersion stability of the modified nanoparticles in the dilute adhesive was also enhanced more than 25 times.
Significance: Incorporation of the modified particles as reinforcing fillers into the adhesive resulted in higher mechanical properties. The nanofiller containing bonding agent also showed higher shear bond strength due to the probable interaction of the carboxylic acid functional groups on the surface of the modified particles with hydroxyapatite of dentin.