introduction: one of the clinical problems in orthodontics is the bonding of brackets tocomposite restorations. the aim of this study was to evaluate the shear bondstrength of brackets bonded to composite restorations using excite. methods:forty brackets were bonded to composite surfaces, which were embedded inacrylic resin. one of the following four protocols was employed for surfacepreparatio...

The ASTM D 1037 six-cycle accelerated-aging test for wood-based panel products was analyzed to determine how each successive aging cycle and selected steps in each cycle contribute to panel deterioration. Hardboard, particleboard, flakeboard, waferboard, and oriented strandboard were evaluated. The rate of panel deterioration generally decreased with each successive aging cycle. Four cycles of ...

F or longevity, few issues in the forest products industry rival the formaldehyde (HCHO) debate. The issue came to the fore in the mid-1970s as increased use of HCHO-emitting board products in more tightly constructed homes led to numerous complaints. As a result. U.S. Housing and Urban Development Agency (HUD) ruled in 1985 that the HCHO level of air in mobile homes would be limited to 0.4 par...

Oriented strand board (OSB) is a commonly used structural wood-based panel for walls and roof siding, but recently the industry has become interested in OSB as substrate indoor outdoor furniture. Particleboard mainly furniture productions popular construction material due to its numerous usage possibilities inexpensive cost. Moisture one of most important factors affecting performance post-trea...

Abstract Binderless particleboards were prepared without any resin adhesives from Broussonetia papyrifera trunk by hot pressing. The effects of particle size, pressing time, temperature and board density on the physical mechanical properties binderless boards investigated. chemical changes in investigated chemical, spectroscopic cellulose crystallinity analyses. bonding performance latex was di...

This paper evaluates, via a laboratory assessment, the physical properties (BS EN 323:1993, BS 324) and mechanical performance 310:1993) of hybrid particleboards using agricultural wastes, namely coconut fibre sawdust. The process begins with preparation materials where they are sieved retained 5-mm sieve then oven-dried. particleboard mixed addition resin (urea formaldehyde) was sprayed hot pr...

Abstract This article presents and discusses the available studies on utilization of waste wood (WW) resource for wood-based panel production. The cited literature indicated that majority WW research was from Europe conducted mainly recycled material particleboard. In addition, particleboard presented as first option product manufactured wood. There a lack recycling plywood. Physical chemical c...

Abstract The paper presents research into the changes of properties in cement-bonded particleboards caused by moisture saturation over course 504 h. Three particleboard variants were tested, all at age 18 months. first is a standard production-line board manufactured CIDEM Hranice, a.s. (identified as CP-R). other two modified by-products manufacturing process—dust (CP-D) and particulate mixtur...