Tooth eruption disorder: 2 cases.

Tooth eruption disorders can have several different causes and treatment options. An 8-year-old boy's tooth 12 erupted in the position of tooth 11, and an 11-year-old girl's tooth 21 did not erupt. In both cases, an attempt was made to regulate the relevant tooth orthodontically, but ultimately it was found necessary to extract the tooth.

[Harvesting of autologous bone graft for the mandible: from the hip or the jaw?].

A 61-year-old edentulous patient presented with dental problems. Examination revealed a very narrow alveolar process in the symphysis area of the chin, with moderate vertical resorption. The decision was made for bone augmentation by means of harvesting an autologous bone graft from the alveolar process.

[The optimal approach to severe facial trauma following a horse's kick].

A 15-year-old girl was brought to the emergency department of a hospital by ambulance with extensive facial trauma following a horse's kick. The considerable impact resulted in a combination of injuries to the bone, teeth and soft tissue. Following the transfer from the ambulance, the AE physician immediately consulted an oral and maxillofacial surgeon.

[Needle breakage during local anaesthesia].

Two patients were referred to a maxillofacial surgeon in connection with the occurrence of needle breakage during local anaesthesia. In the first case, of a 67-year-old woman, it concerned a needle breakage after giving mandibular block anaesthesia. The needle could be removed quite easily under local anaesthesia.

Preferred and actual retirement age of oral and maxillofacial surgeons aged 55 and older in the Netherlands: a longitudinal study from 2003 to 2016.

Background: In workforce planning for oral and maxillofacial surgeons in the Netherlands, it is important to plan timely, as these dental specialists are required to earn both medical and dental degrees. An important factor to take into account in workforce planning is the outflow of the profession through retirement. In the workforce planning in the Netherlands, it was assumed that retirement plans are a predictor for the actual moment of retirement.

[A Stafne cyst. A cyst or not?].

In an 80-year-old man, a radiolucent laesion was seen on the panoramic radiograph of the right mandible. The localisation of the radiolucent laesion under the mandibular canal and the additional finding of fatty tissue or submandibular salivary gland in the concavity on the cone beam computed tomography are virtually probative for a Stafne cyst.

[Radiolucent and opaque lesions on a panoramic radiograph; a cyst or not?].

In the context of pain diagnostics, several lesions, partially radiolucent and partially opaque, were identified by chance in the mandible and maxilla. On the basis of the characteristic x-ray image, it was assumed to be cemento-osseous dysplasia. At an early stage, this cannot easily be distinguished from apical periodontitis.

[A solitary, defined radiolucency on a panoramic radiograph; cyst or no cyst?].

Sharply defined radiolucencies on a panoramic radiograph are often interpreted as cystic laesions. In some cases, however, it appears to be another condition, or an anatomical variation. In the present case, involving 2 healthy patients, 1 or more sharply defined lucencies were seen in the lateral parts of the mandible.

The effect of incremental levels of dietary nitrate on methane emissions in Holstein steers and performance in Nelore bulls.

Two experiments were conducted to study effects of dietary nitrate on enteric methane production, blood methemoglobin concentration, and growth rate in cattle. In Exp. 1, 36 Holstein steers (288 ± 25 kg BW) were fed increasing levels of dietary nitrate (6 levels; 0 to 3.

Evaluation of the SF6 tracer technique for estimating methane emission rates with reference to dairy cows using a mechanistic model.

A dynamic, mechanistic model of the sulfur hexafluoride (SF6) tracer technique, used for estimating methane (CH4) emission rates from ruminants, was constructed to evaluate the accuracy of the technique. The model consists of six state variables and six zero-pools representing the quantities of SF6 and CH4 in rumen and hindgut fluid, in rumen and hindgut headspace, and in blood and collection canister. The model simulates flows of CH4 and SF6 through the body, subsequent eructation and exhalation and accumulation in a collection canister.

Dietary nitrate supplementation reduces methane emission in beef cattle fed sugarcane-based diets.

The objective of this study was to determine the effect of dietary nitrate on methane emission and rumen fermentation parameters in Nellore × Guzera (Bos indicus) beef cattle fed a sugarcane based diet. The experiment was conducted with 16 steers weighing 283 ± 49 kg (mean ± SD), 6 rumen cannulated and 10 intact steers, in a cross-over design. The animals were blocked according to BW and presence or absence of rumen cannula and randomly allocated to either the nitrate diet (22 g nitrate/kg DM) or the control diet made isonitrogenous by the addition of urea.

Persistency of methane mitigation by dietary nitrate supplementation in dairy cows.

Feeding nitrate to dairy cows may lower ruminal methane production by competing for reducing equivalents with methanogenesis. Twenty lactating Holstein-Friesian dairy cows (33.2±6.

Effects of a combination of feed additives on methane production, diet digestibility, and animal performance in lactating dairy cows.

Two experiments were conducted to assess the effects of a mixture of dietary additives on enteric methane production, rumen fermentation, diet digestibility, energy balance, and animal performance in lactating dairy cows. Identical diets were fed in both experiments. The mixture of feed additives investigated contained lauric acid, myristic acid, linseed oil, and calcium fumarate.

Nitrate and sulfate: Effective alternative hydrogen sinks for mitigation of ruminal methane production in sheep.

Twenty male crossbred Texel lambs were used in a 2 × 2 factorial design experiment to assess the effect of dietary addition of nitrate (2.6% of dry matter) and sulfate (2.6% of dry matter) on enteric methane emissions, rumen volatile fatty acid concentrations, rumen microbial composition, and the occurrence of methemoglobinemia.

[Haematoma of the floor of the mouth following implant surgery].

A patient experienced severe bleeding in the floor of the mouth as a consequence of the placement of 2 implants in the resorbed anterior segment of the mandible. The resulting swelling of the floor of the mouth caused a life-threatening obstruction of the trachea. The patient was urgently transferred to a hospital.

The use of Straumann Bone Ceramic in a maxillary sinus floor elevation procedure: a clinical, radiological, histological and histomorphometric evaluation with a 6-month healing period.

Objectives: In this study, we evaluated the quality and quantity of bone formation in maxillary sinus floor elevation procedure using a new fully synthetic biphasic calcium phosphate (BCP) consisting of a mixture of 60% hydroxyapatite and 40% of beta-tricalcium phosphate (Straumann Bone Ceramic).

Material And Methods: A unilateral maxillary sinus floor elevation procedure was performed in six patients using 100% BCP. Biopsy retrieval for histological and histomorphometric analysis was carried out before implant placement after a 6-month healing period.

Long-term changes in graft height after maxillary sinus floor elevation with different grafting materials: radiographic evaluation with a minimum follow-up of 4.5 years.

Objective: To compare the vertical dimensional changes with regard to graft height in a long-term follow-up in patients treated with two different grafting materials used in maxillary sinus floor elevation procedures.

Material And Methods: Twenty consecutive patients were included. One group was grafted with autogenous bone from the mandible (chin area), and the other group was augmented with a 100% beta-tricalcium phosphate (beta-TCP).

[Surgical dilemmas. Sinus floor elevation].

Limited alveolar bone height prevents the placement of dental implants. Sinus floor elevation is an internal augmentation of the maxillary sinus that allows implants to be placed. The principle of this surgical procedure is the preparation of a 'top hinge door', that is raised together with the Schneiderian membrane in the cranial direction.

Anatomical and surgical findings and complications in 100 consecutive maxillary sinus floor elevation procedures.

Purpose: To investigate the prevalence of anatomical and surgical findings and complications in maxillary sinus floor elevation surgery, and to describe the clinical implications.

Patients And Methods: One hundred consecutive patients scheduled for maxillary sinus floor elevation were included. The patients consisted of 36 men (36%) and 64 women (64%), with a mean age of 50 years (range, 17 to 73 years).

The surgical management of post-traumatic malocclusion.

Facial skeleton fractures should be reduced as early as possible to restore optimal function and minimize skeletal and soft-tissue deformity. With unsatisfactory outcome from delayed treatment because of comorbidity, or despite optimal management, late reconstruction can succeed with conventional orthognathic surgical procedures. Management follows well-established principles of correcting dentofacial deformities, coordinated with orthodontic and prosthodontic support.

[Mediastinitis and cervical fasciitis necroticans post extraction of 2 molars].

A 38-year-old man developed dysphagia, fever and marked trismus, resulting in an abcess of the parafaryngeal region, soon after the surgical extraction of 2 mandibular molars. Despite systemic antibiotics and surgical drainage, the abcess spread to the mediastinum. Within a short space of time, cervical fasciitis necroticans and descending necrotizing mediastinitis developed.

Maxillary sinus floor augmentation using a beta-tricalcium phosphate (Cerasorb) alone compared to autogenous bone grafts.

Purpose: A prospective human clinical study was conducted to determine the clinical and histologic bone formation ability of 2 graft materials, a beta-tricalcium phosphate (Cerasorb; Curasan, Kleinostheim, Germany) and autogenous chin bone, in maxillary sinus floor elevation surgery.

Materials And Methods: Ten healthy patients underwent a bilateral (n = 6) or unilateral (n = 4) maxillary sinus floor elevation procedure under local anesthesia. In each case, residual posterior maxillary bone height was between 4 and 8 mm.