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INTRODUCTION :
The diastema from the Greek diastèmà (interstice is defined as the existence of space between the teeth of the same arch. The objectives of the study were to determine the epidemiological profile of diastemas; describe the clinical forms encountered, and provide care.

PATIENTS AND METHOD :
This was a descriptive prospective study carried out at the Donka National Hospital and lasted seven months, from March 1 to September 30, 2019.

RESULTS :
The female sex predominated with 77.7% against 22.2% of the male sex, giving a ratio (f / h) = 3.5. The age group of 21-23 years (all sexes combined) was the most represented with a percentage of 44.4%. The tonicity of the median labial frenum with 29.62% was the main etiology of the interincisal diastema. Diastema was more frequent in the maxilla with respective values of 33.33% of canine incisor block diastema and 29.62% of interincisal diastema, a total of 62.96%. The treatment was surgical, orthodontic and prosthetic.

CONCLUSION :
The diastema remains one of the frequent orthodontic anomalies in our countries. Considered by some to be an excess of space on the dental arch, it is nevertheless appreciated in certain West African countries where it is often considered by the population as a sign of luck, and beauty.

Key words: Clinical manifestations, diastema, indications for treatment.

Lack of retention and stability are the main complaints in complete removable mandibular dentures due to the continuous bone resorption in edentulous subjects. Several therapeutic alternatives can be recommended in order to improve the prosthetic balance. The piezographic technique proves to be one of the most efficient techniques in these situations. It allows an optimal prosthetic integration in the functional corridor of this prosthesis. Today, the implant solution appears to be a determining factor in the successful treatment of this type of edentulism. It enhances the retention of complete removable mandibular prostheses. In this work, a clinical illustration of a similar case will be treated with a complete mandibular denture using these two therapeutic solutions combined.

Keywords: Complete mandibular edentulism, resorbed ridge, implantology, piezography.

A mucocele is a very common lesion of the oral mucosa resulting from a salivary accumulation, due to an alteration of the minor salivary gland. It may occur from extravasation or retention of the secretion. Extravasation mucocele is the most common form that appears in the lower lip by trauma. The surgical excision remains the gold standard therapy for this lesion, but relapse might happen. We describe here a lower lip mucocele in a 24-year male patient with no general health issue, treated by surgical removal, in the UM6SS’s dental center.

Keywords : Mucocele, mucous cyst, minor salivary glands, lower lip, surgical removal.

INTRODUCTION :
Human bites represent 3% of bites encountered in the emergency department [1]. Evidence and consensus on best practices for human bite management are lacking [2]. Our first attempt at reconstruction from the amputated part having failed, we undertook this study, the objectives of which were to identify the factors of failure and to determine the interest of a secondary repair.

CASE REPORT :
A 24-year-old female patient, housewife. On intraoral examination, normal mouth opening was noted. Teeth 32 and 31 are exposed due to loss of labial substance. The dental articulation preserved, the oral hygiene defective. On admission, the patient held the 2 cm x 1.8 cm amputated piece in a glass filled with mineral water, the color of which suggested compromised vitality due to a lack of vascularization. Biological examinations did not reveal any peculiarities. After careful disinfection, the piece was replaced and positioned using 3/0 vicryl suture threads. The delay between amputation and admission to the Department was 7 hours, more or less compromising the vitality of the piece. Significantly less than that found by Roland C et al in three different studies which found less than 14% of patients were admitted and more than 80% presented within 12 or 24 hours of the bite.

CONCLUSION :
An attempt to intentionally replace a part amputated by human bite without vascular surgery is doomed to failure by progressive necrosis. However, second-line surgical repair gives satisfactory aesthetic and functional results.

keywords : amputation, lip, bite

Edentulousness is inevitably accompanied by physiological or pathological bone resorption due to poorly rehabilitated prosthesis. This leads to a reduction in the prosthetic support surface, with all anatomo-physiological resulting consequences; thus compromising the achievement of an optimal balance of the prosthesis. The determination and the recording of the neutral zone by the piezographic impression and its maximum exploitation by the final prosthesis is an interesting technique, when other means of optimizing the retention and stability of the complete removable prosthesis (implants, vestibular deepening surgery) cannot be indicated. The purpose of this article is to describe step-by-step recording of the neutral zone by the piezographic impression in the case of a flat mandibular ridge, and to discuss the different techniques and materials used.

Key words: Neutral zone; piezography; flat mandibular ridge; prosthetic balance.