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Introduction to Wood

Introduction to Wood

Wood, derived from trees, is a versatile and widely used construction material. Trees feature a trunk surrounded by a protective layer of dead bark. Beneath this outer layer lies the living bark, followed by the cambium, and then the sapwood which transitions into heartwood as it matures. At the center of the trunk is the pith. The age of a tree can be discerned by examining its growth rings, which are concentric bands visible in the trunk's cross-section.
The structural integrity of the wood...

Softwoods and Hardwoods

Softwoods and Hardwoods

Softwoods and hardwoods, derived from different types of trees, are distinguished by their leaf structures and cellular compositions, each serving unique purposes in construction and manufacturing. Softwoods come from cone-bearing trees with needle-like leaves and are predominantly composed of longitudinal cells called tracheids and a smaller proportion of radial cells known as rays. Due to their cellular structure, softwoods are commonly used in construction for structural frames, sheathing,...

Wood Surfacing

Wood Surfacing

Wood surfacing is a critical finishing process designed to smoothen the wood surface, enhance its dimensional accuracy, and make handling safer. This process compensates for potential shrinkage during the seasoning phase by marginally increasing the wood dimensions before surfacing. It also helps correct some distortions that may occur as the wood dries.
The equipment used in the surfacing process is a plane equipped with rotating blades. This tool efficiently smoothens the wood surface and can...

Veneer

Veneer

Veneer refers to a thin sheet of wood, typically produced to a thickness of about one-eighth of an inch or less. This material is crafted through various methods, the most common being rotary cutting. In this process, a log is mounted into a large lathe and spun against a knife edge, peeling off a continuous strip of wood as the knife penetrates deeper into the rotating log, creating a rotary-cut veneer.
Other veneering techniques include plain-slicing, quarter-slicing, and rift-slicing. These...

Wood Products

Wood Products

Wood products encompass a broad range of materials crafted from wood strands, veneers, lumber, and even waste wood-like shreds, designed for both structural and nonstructural purposes. Various specialized wood products have been developed to enhance strength, durability, and versatility in building applications.
Glue-laminated wood, often referred to as glulam, combines multiple smaller pieces of dimensional lumber using adhesives to form a single, larger piece. Cross-laminated timber consists...

Wood Panel Products

Wood Panel Products

Wood panel products are essential materials used in construction for applications such as flooring, siding, and roofing, typically available in standard dimensions of 4 feet by 8 feet, with thicknesses varying from one-quarter of an inch to one and one-eighth inches. Among the most common types of wood panels is plywood, which is produced by gluing multiple layers of thin wood veneers under pressure. The grain of the outer veneers runs lengthwise, while the grains of the interior layers run...

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Related Experiment Video

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Oral Biofilm Formation on Different Materials for Dental Implants

Oral Biofilm Formation on Different Materials for Dental Implants

Published on: June 24, 2018

Juniper wood as a possible implant material.

K A Gross¹, E Ezerietis

¹School of Physics and Materials Engineering, P.O. Box 69M, Monash University, 3800 Australia. karlis.gross@spme.monash.edu.au

Journal of Biomedical Materials Research. Part A

|February 26, 2003

Summary

Juniperus communis wood shows potential as a biocompatible implant material. Its essential oils are non-toxic, and sterilization improves bone integration, demonstrating promising results in animal studies.

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Area of Science:

Biomaterials Science
Orthopedic Surgery
Wood Science

Background:

Natural materials like wood and bone share structural similarities for support and nutrient transport.
Juniperus communis wood offers density, durability, strength, and natural antiseptic properties due to essential oils.
Investigating wood as a potential implant material is inspired by its functional and property parallels with bone.

Purpose of the Study:

To assess the toxicity of Juniperus communis wood's essential oils.
To evaluate the impact of sterilization on the wood's mechanical properties.
To examine bone attachment and biocompatibility of wood implants in animal models.

Main Methods:

Oral and intravenous administration to determine oil toxicity.
Sterilization of wood in boiling water.
Surgical implantation of wood femoral implants in rabbits for up to 3 years.

Main Results:

Essential oil toxicity was found to be negligible at concentrations relevant to in-vivo release.
Sterilization reduced the elastic modulus and modulus of rupture, improving bone-matching properties.
Rabbit implants showed good acceptance, with evidence of bone apposition, pore abutment, and ingrowth into cavities.

Conclusions:

Juniperus communis wood is a non-toxic, biocompatible material for orthopedic implants.
Sterilization enhances wood's mechanical properties for better bone integration.
Long-term animal studies indicate successful bone attachment and acceptance of wood implants.