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Jatropha press cake (Jatropha curcas L) has high crude fiber which is potential to be utilized as raw material for particle board production. The objective of this study is to assess the physical and mechanical properties of Jatropha press cake particle board and effect of addition of paraffin and sago starch to improve the quality of particle board. The paraffin was added at 0, 1, and 3%, and the sago starch was added at 6, 8, and 10%. The physical and mechanical properties of particle board product were evaluated. The density of particle board ranged at 0.84-0.95 g/cm3, moisture content 4.56-6.19%, the thickness-swelling for 2h and 24h by soaking in water were 11.67-20.12% and 16.22-25.70%, respectively. The water absorption of particle board for 2h and 24h by soaking in water were 48.74-62.20% and 63.10-72.75%. The Modulus of Rupture (MoR) and Modulus of Elasticity (MoE) of particleboard were 19.70-97.44 kgf/cm2 and 1552-7235 kgf/cm2, respectively. The addition of paraffin and sago starch can improve the physical and mechanical properties of particle board. The particle board with paraffin addition of 3% and sago starch of 10% passes the MoR in accordance with Japan Industrial Standard (JIS) of A 5908:2003.

The Kennedy Class I removable partial denture (RPD) can cause stress to supporting hard and soft tissues and may lead to harmful effects. The purpose of this study is to investigate the pattern of these stresses in three different positions before and following a relining procedure. Ten patients, five males and five females, with a lower distal extension RPD and an opposing upper class III type RPD were selected for this study. Strain gauges together with a strain gauge indicator were used to study the pattern of stresses in three selected positions. Some changes were significantly different at the site of the denture base and at the metal frame near the direct retainer. After relining, the stresses were shared partially by the abutments and partially by the tissues. Maximum stresses were reported during swallowing. No significant difference was noticed between males and females. Citation Al-Ghannam NA, Fahmi FM. Effect of Direct Relining on Stresses at the Denture Base and the Metal Frame of Removable Partial Dentures. J Contemp Dent Pract 2005 February;(6)1:037-047.

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