Young's modulus of peritubular and intertubular human dentin by nano-indentation tests.

The local Young modulus of dry dentin viewed as a hierarchical composite was measured by nano-indentation using two types of experiments, both in a continuous stiffness measurement mode. First, tests were performed radially along straight lines running across highly mineralized peritubular dentin sections and through less mineralized intertubular dentin areas. These tests revealed a gradual decrease in Young's modulus from the bulk of the peritubular dentin region where modulus values of up to ∼40-42GPa were observed, down to approximately constant values of ∼17GPa in the intertubular dentin region.

A novel experimental method for the local mechanical testing of human coronal dentin.

Objectives: The small volume of human dentin available for sample preparation and the local variations in its microstructure present a real challenge in the determination of their mechanical properties. The main purpose of the present study was to develop a new procedure for the preparation and mechanical testing of small-scale specimens of biomaterials such as dentin, so as to probe local mechanical properties as a function of microstructure.

Methods: Ultra short laser pulses were used to mill a block of dentin into an array of 16 microm size dentin pillars.

Effect of different restorative materials on caries: a retrospective in vivo study.

Objective: To compare, retrospectively, the influence of different types of restorative materials on caries in vivo.

Method And Materials: Twenty-three primary teeth restored by a single operator with amalgam and 2 polyacid-modified resin composites, and with a band of tooth structure beyond the floor of the cervical box, were selected for microscopic evaluation. The teeth were sectioned mesiodistally with the aid of a hard tissue microtome, polished, and cleaned.

First-choice treatment alternatives for caries removal using the chemomechanical method.

Modern dentistry aims to preserve tooth structure using minimally invasive procedures. Chemomechanical removal of caries is a new method with the advantage of selective removal of severely demineralized dentin. In addition, the method enhances the clinician's ability to diagnose caries.

Migration following crown-lengthening procedure--a case report.

Periodontal surgery may be accompanied with some postoperative complications such as pain, swelling and sloughing, purulence or infection, transient bacteremia, nerve trauma, and hemorrhage. In general, a resective surgical intervention may implicate reduction in the attachment apparatus. Migration as a postoperative complication has never been addressed in the literature.

The use of lasers in dentistry: principles of operation and clinical applications.

This article describes the principles of laser operation and the clinical application of laser technology in the different fields of dentistry. It discusses the use of the Er:YAG laser in restorative dentistry, pediatric dentistry, and periodontics, as well as the introduction of a new side-firing spiral tip for efficient cleaning of the root canal system by means of lateral laser irradiation. Although the Er:YAG laser is used mostly on enamel and dentin, the gingival depigmentation procedure using this laser also is described.

Amalgam type, adhesive system, and storage period as influencing factors on microleakage of amalgam restorations.

Statement Of Problem: The penetration of oral fluids and bacteria at the interface between the preparation walls and amalgam restorations, known as marginal microleakage, continues to be a problem in restorative dentistry. Microleakage may result in secondary caries and the irritation of the pulp.

Purpose: This study evaluated the effect of amalgam type, adhesive system, and storage period on microleakage of amalgam restorations.

Lingual forced eruption orthodontic technique: clinical considerations for patient selection and clinical report.

Lingual forced eruption is a treatment modality that minimizes esthetic impairment during orthodontic treatment. Use of this technique can enhance the acceptance of orthodontic treatment by adult patients and minimize unnecessary compromises in the treatment planning of submerged roots. In this clinical report, a treatment modality for forced eruption therapy is described, clinical considerations for patient selection are identified, and the advantages and limits of the lingual orthodontic technique are discussed.