AIM To compare mineral trioxide aggregate (MTA) with calcium hydroxide when used as pulp-capping materials in human teeth. METHODOLOGY Eleven pairs of maxillary third molars in subjects between 20 and 25 years of age were subjected to mechanical pulp exposure. The exposed pulps were capped with MTA or calcium hydroxide, covered with ZOE and restored with amalgam. A total of 14 teeth were extr...

APMP process has been conventionally used to produce writing and printing papers. Maragheh Paper Industries Company (MPIC) was first company in Iran which started producing alkaline peroxide mechanical pulp (APMP) on a new Andritz 50000 tones/year at its mill in Maragheh city followed by establishment of another 50000 tones/year in Kermanshah city, Iran. Due to lack of required chemicals for th...

Three commercial starches were evaluated in conjunction with colloidal silica and flocculant to retain precipitated calcium carbonate (PCC) filler. A unique feature of this study was the fact that the filler was pre-flocculated by a portion of starch (2kg starch/t PCC) and the rest of the starch was added after the flocculant but before the silica. The pulp used was peroxide bleached thermo-mec...

A novel, efficient, and direct blend of solvents, tetrabutylammonium acetate/dimethyl sulfoxide (TBAA/DMSO), was used for the dissolution and regeneration of bamboo pulp. Regenerated fibers were successfully prepared by a wet spinning process. The bamboo pulp without any pretreatment was readily soluble in the solvent under mild conditions. The dissolution process was observed using a confocal ...

Sugarcane bagasse was delignified with alkali and peracetic acid in a two-stage process to obtain pulps with high yield and low kappa number. The experimental results indicated that alkali pretreatment prior to peracetic acid (PAA) delignification could significantly reduce PAA loading by partially removing lignin and swelling the fibers. An optimum condition for the two-stage delignification w...

CAMES (computer-aided mechanical expert system) is a tool for automatically designing material-handling equipment used in pulp and paper mills. Operational since 1988, it has designed over 700 machines in a total of 5 classes and, consequently, has influenced our principles for deploying all knowledge-based systems. Because it is being extended to other machines within our group of companies, i...

Using standard laboratory procedures, it was found that different pulptypes showed very different recycling effects. Mechanical pulp fibres became flatter andmore flexible giving a denser, stronger sheet. Beaten chemical pulp fibres “hornified”, resulting in a bulkier, weaker sheet. Unbeaten chemical pulp fibres were initially curly;recycling removed the curl. A mechanicallchemical<...

AIM In the last decade, tissue engineering has undergone enormous expansion in the fields of regenerative medicine and dentistry. In response to mechanical and chemical injuries, the dentine-pulp complex possesses a regenerative ability due to a speci?c population of mesenchymal stem cells, which have been widely described in literature. The postnatal dental pulp also contains progenitor stem c...

This review describes medium and high molecular weight organic material found in wastewaters from pulp and paper industry. The aim is to review the versatile pollutants and the analysis methods for their determination. Among other pollutants, biocides, extractives, and lignin-derived compounds are major contributors to harmful effects, such as toxicity, of industrial wastewaters. Toxicity of wa...

1 Editorial: Dentin Leo Tjäderhane 3 Dentin basic structure and composition—an overview Leo Tjäderhane, Marcela R. Carrilho, Lorenzo Breschi, Franklin R. Tay & David H. Pashley 30 Microstructure and mechanical behavior of radicular and coronal dentin Dwayne Arola, Juliana Ivancik, Hessam Majd, Ashraf Fouad, Devendra Bajaj, Xiu-Yin Zhang & Naomi Eidelman 52 The dentin–pulp border: a dynamic inte...