MyMedR

The abilities of three Nickel-Titanium mechanized systems to negotiate and shape MB2 canals in extracted maxillary first molars-a Micro-Computed Tomographic study

Ahmed HMA

Int Endod J, 2019 Nov;52(11):1671-1672.

PMID: 31592539 DOI: 10.1111/iej.13196

A new coding system for root and canal morphology - an online survey from Peru

Salas H, Torres J, Pauro J, Ahmed HMA

Int Endod J, 2021 Jan;54(1):147-149.

PMID: 33351981 DOI: 10.1111/iej.13439

Root and canal morphology of maxillary premolar teeth in an Egyptian subpopulation using two classification systems: a cone beam computed tomography study

Saber SEDM, Ahmed MHM, Obeid M, Ahmed HMA

Int Endod J, 2019 Mar;52(3):267-278.

PMID: 30225932 DOI: 10.1111/iej.13016

AIM: To investigate the number of roots and root canal configurations using two coding systems and the root canal diverging and merging levels in extracted maxillary premolars in an Egyptian subpopulation using cone beam computed tomography (CBCT).

METHODOLOGY: A total of 700 maxillary premolars were examined using CBCT in an Egyptian subpopulation. The number of roots was identified, and root canal configurations were classified according to Vertucci's classification and a new system for classifying root and canal morphology. In addition, the position where roots bifurcated and the levels where canals merged or diverged were identified. Fisher's exact test and independent t-test were used for statistical analysis, and the level of significance was set at 0.05 (P = 0.05).

RESULTS: More than half of maxillary first premolars were double-rooted, and the majority of maxillary second premolars were single-rooted (P

Should inter-canal communications be included in the classification of root canal systems?

Karobari MI, Noorani TY, Halim MS, Dummer PMH, Ahmed HMA

Int Endod J, 2019 Jun;52(6):917-919.

PMID: 31074504 DOI: 10.1111/iej.13106

A critical analysis of laboratory and clinical research methods to study root and canal anatomy

Ahmed HMA

Int Endod J, 2022 Feb 06.

PMID: 35124829 DOI: 10.1111/iej.13702

The technical execution of root canal treatment procedures demands a thorough understanding and knowledge of root and canal anatomy. Over the decades, and with the aid of various research methods such as staining and clearing, 2D radiographic imaging, sectioning procedures, cone beam computed tomography and micro-computed tomography, many laboratory and clinical studies have been undertaken to understand the root and canal anatomy of the human dentition. This has resulted in a tremendous increase in the body of knowledge with a wide range of qualitative and quantitative presentations of the root and canal anatomy. This review aims to provide a critical analysis for the laboratory and clinical research methods in root and canal anatomy studies. In addition, it aims to identify existing gaps and present insights for directions of future research and ways for translation to clinical endodontics.

Anatomical challenges, electronic working length determination and current developments in root canal preparation of primary molar teeth

Ahmed HM

Int Endod J, 2013 Nov;46(11):1011-22.

PMID: 23711096 DOI: 10.1111/iej.12134

Paediatric endodontics is an integral part of dental practice that aims to preserve fully functional primary teeth in the dental arch. Pulpectomy of primary molars presents a unique challenge for dental practitioners. Negotiation and thorough instrumentation of bizarre and tortuous canals encased in roots programmed for physiological resorption are the main challenges for this treatment approach. Consequently, numerous in vitro and in vivo studies have been conducted to validate the application of some contemporary endodontic armamentarium for effective treatment in primary molars whilst maintaining favourable clinical outcomes. Electronic apex locators, rotary nickel-titanium files and irrigation techniques are at the forefront of endodontic armamentarium in paediatric dentistry. Hence, this review aims to map out the root and root canal morphology of primary molars, to discuss the application of electronic apex locators in primary molars and to provide an update on the preparation of their root canal systems.

Differentiation of stem cells derived from carious teeth into dopaminergic-like cells

Gnanasegaran N, Govindasamy V, Abu Kasim NH

Int Endod J, 2016 Oct;49(10):937-49.

PMID: 26354006 DOI: 10.1111/iej.12545

AIM: To investigate whether dental pulp stem cells from carious teeth (DPSCs-CT) can differentiate into functional dopaminergic-like (DAergic) cells and provide an alternative cell source in regenerative medicine.

METHODOLOGY: Dental pulp stem cells from healthy (DPSCs) and carious teeth (DPSCs-CT) were isolated from young donors. Both cell lines were expanded in identical culture conditions and subsequently differentiated towards DAergic-like cells using pre-defined dopaminergic cocktails. The dopaminergic efficiencies were evaluated both at gene and protein as well as at secretome levels.

RESULTS: The efficiency of DPSCs-CT to differentiate into DAergic-like cells was not equivalent to that of DPSCs. This was further reflected in both gene and protein generation whereby key neuronal markers such as nestin, NURR1 and beta-III-tubulin were expressed significantly lower as compared to differentiated DPSCs (P

Discolouration potential of endodontic procedures and materials: a review

Ahmed HM, Abbott PV

Int Endod J, 2012 Oct;45(10):883-97.

PMID: 22621247 DOI: 10.1111/j.1365-2591.2012.02071.x

Advances in endodontic materials and techniques are at the forefront of endodontic research. Despite continuous improvements, tooth discolouration, especially in anterior teeth, is considered an undesirable consequence following endodontic treatment as it creates a range of aesthetic problems. This article aims to discuss the intrinsic and internalized tooth discolouration caused by endodontic procedures, and to address the discolouration potential of materials used during root canal treatment, including root canal irrigants, intra-canal medicaments, endodontic and post-endodontic filling materials. In addition, the discolouration patterns caused by combined endodontic and nonendodontic aetiological factors are discussed. The recommended guidelines that should be followed by dental practitioners to prevent and manage tooth discolouration are also outlined.

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