[Blade implants: new ideas]. / Les implants-lames: nouvelles conceptions.

It is often thought that the insertion of laminar implants is imprecise, poorly standardized, and consequently, does not favour integration into the bone. We have been able to confirm that laminar implants are integrated into the bone in an experimental dog model and in pathology studies. To avoid the inconveniences often encountered, we developed a new concept laminar implant. Characteristics of the implant Body thickness = 1.2 mm; length = 20 and 16 mm; height of body = 6 or 8 mm; shaft : 3.25 mm diameter. The most important feature is that the upper part of the sheath around the collar does not overrun the upper border of the body by more than 1 mm. The total height is thus 7 or 9 mm. Insertion technique Discs are mounted on the counter-angle at increasing thicknesses. The third and last disc is 1.2 mm thick and has a radius corresponding to the 7 or 9 mm implant. The mandibular canal is perfectly protected with this technique. Indications Thin crests in the molar region of the mandible. Minimal bone between the crest and the mandibular canal. Subsinus implantation.

[Lesions of the inferior alveolar nerve during extraction of the wisdom teeth. Consequences--prevention]. / Lésions du nerf alvéolaire inférieur au cours de l'extraction des dents de sagesse. Conséquences--prévention.

Neurological consequences of extractions of the third inferior molar can be severe. Progress in imaging techniques has made it possible to identify molars << at risk >>. Extraction by wear without removal of the apex is proposed as a means of avoiding damage to the alveolar nerve. If no surgical prophylaxy is used the risk is major sequellae: painful anaesthesia of the area involved. There is no really effective treatment for such sequellae, creating persistent psychological problems throughout life.

[Arsenical necrosis still exists... I have seen it]. / La nécrose arsenicale existe encore ... je l'ai rencontrée.

Arsenic necroses occur after the use of arsenic anhydride for pulp removal. This technique was widely used until relatively recently. It is interesting to compare, in this regard, the evolution of concepts in this field.

[Lesions of the oral cavity induced by chewing tobacco]. / Les lésions de la cavité buccale induites par le tabac à chiquer.

Currently, in France, chewing tobacco has only a small place amongst the factors of tobacco intoxication. The same is not true for North Africa, where it is very widely used, and in the United States, where it is enjoying considerable popularity. The consequences of this type of tobacco intoxication can be severe for the oral cavity: reactional keratosis, gingival retraction, dental coating, periodontitis, risk of malignant degeneration. The public health services must be warned of the dangers of this form of tobacco intoxication.

[Epidermoid cysts and implants. Anatomo-pathologic findings]. / Kystes épidermoïdes et implants. Constatations anatomopathologiques.

A case is reported that is exceptional in more than one respect. The mandibular region was the site of development of three cysts: a radiculo-dental cyst, a coronodental cyst in appearance but which could have been an epidermoid cyst and a typical epidermoid cyst. Lingual nerve lesions are a rare, major complication of implantations. Dismounting of a stable implant is a very rare occurrence. Histopathology showed a bone integration process in contact with the major part of implant, an interposed fibrous band existing in certain sectors only.