There has been a considerable increase in the clinical use of lasers in dentistry over the past thirty years, especially in orthodontics. But clinicians who have not yet made their decisions about participating in this technological revolution can be perplexed by the great variety of wave lengths available, the vast number of machines that can be used to employ them, and the complexity of the principles of physics upon which lasers beams are based.

The objective of this article is to give practitioners a better understanding of the indications for the use of the various types of lasers.

The relevance of this paper consists in comparing the practitioner’s view to general public opinion. Orthodontists learned to evaluate facial profiles in a critical way, with reference to standards. They have developed personal appreciations to gauge a balanced profile. But, because orthodontic treatment implies achieving an aesthetic effect, the practitioner must know what is the optimal objective according to the public opinion. Our study deals with the aesthetic assessment of teenagers’ profiles in Class II (Corner and Ballard) by professional examiners and lay people. These profiles have been modified by simulating mandibular protrusion.

The objective of this work is to study the static and dynamic occlusion of dentitions in a Class III molar relationship to determine what might be the indications for treatment that would leave buccal segments in this position, and to evaluate the occlusal adaptions that would be needed to make it functionally acceptable.

A cross bite of one or more anterior teeth can interfere with the function of the incisocanine block in guiding mandibular escursive and protrusive movements out of a position of occlusion.

When this type of malocclusion occurs without any associated skeletal imbalance, orthodontists can correct it with relative ease by using a variety of well-documented appliances. The objective of this article is to describe a myofunctional approach for dealing with this problem.

In it, the orthodontist first removes the cross bite’s blockage of tooth movement by placing glass-ionomer cement blocks on the occlusal surfaces of posterior teeth. When this is done the tongue, labial, and cheek musculature can accomplish their role, without inhibition, of correcting positions of the dentoalveolar arches in two or three months.

1 –The word "orthodontics". In 1841, Lefoulon suggested the term "orthodontosie," which the Americans simplified to "orthodontia" and, later, to "orthodontics". But the French resisted. A long struggle began between"orthopedics" and "orthodontics, " which wound up in 2007 with "orthognathodontics". Have we reached a truce?

2 – The word "malocclusion". E. Angle decided that the word "irregularity" employed in the 19th century was inappropriate. He proposed the term "malocclusion", which the French for a long time denigrated only to begin to employ it recently. But beneath new vocables new concepts are hidden.