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Biomedical subjects

L A van Loon

Publications and source records attributed to L A van Loon.

15 recordsLinked to original sources
PubMed2000

[Treatment protocol for craniomandibular disorder 1. Diagnosis].

In two essays the treatment strategy of the department of Oral Function of the Academic Center of Dentistry Amsterdam for treating craniomandibular disorder (CMD) patients will be presented. This first essay starts with a short description of the symptomatology, classification and etiology of CMD. Then it is described how to diagnose a CMD with the use of a standardized diagnostic protocol. Some important aspects of the differential diagnosis of CMD are discussed. Furthermore it is discussed when a CMD-patient can be treated by the dentist or when referral to a CMD specialist or oral surgeon is necessary.

Craniomandibular Disorders↗
PubMed2000

[Treatment protocol for craniomandibular dysfunction 2. Treatment].

In two essays the treatment strategy of the department of Oral Function of the Academic Center of Dentistry Amsterdam for treating craniomandibular disorder (CMD) patients is described. In this second essay a description is given of several dental, physiotherapeutical and psychological treatment modalities for CMD. Then treatment strategies for the different categories of CMD are described. It is also indicated which aspects of the treatment strategy are based upon 'evidence based care' and which aspects are more based upon principles of 'common sense' and 'clinical prudence'.

Analgesics↗
PubMed1999

[Cutaneous and mucosal reactions to dental materials].

The concentration of substances released by dental materials is usually too low to cause systemic-toxic effects, but there is the potential to induce dermatoses in especially dentists as well as mucositis in mainly dental patients. The cytotoxic irritative and allergic diseases are successively described categorized according to their pathogenesis. The identification of the diseases, which often have a similar appearance, depends on history-taking and patch testing. Non-dental sensitization is of diagnostic importance.

Dental Materials↗
PubMed1997

Subjective pain report and the outcome of several orthopaedic tests in craniomandibular disorder patients with recent pain complaints.

A comparison between a subjective pain report and the outcome of the combined dynamic and static pain tests, and several other orthopaedic tests, was investigated in craniomandibular disorder (CMD) patients with recent pain complaints and in control subjects. Thirty-two CMD patients who clearly reported pain in the masticatory muscle region or in the temporomandibular joint region by means of a symptom report questionnaire (SRQ), participated in the study. The investigators performing the symptom report interview and the clinical tests were blinded to each other. A high correspondence was shown between the patients reporting joint or muscle pain (by means of SRQ) and the classification into arthrogenous and myogenous pain patients, based on the outcome of the dynamic and static pain tests (P = 0.0003). The outcome of four other orthopaedic tests: passive maximum mouth opening (PMMO; P = 0.0001), palpation of the temperomandibular joint (TMJ) and the masticatory muscles (P = 0.0002), TMJ-play (P = 0.0001), and TMJ-compression (P = 0.0138) demonstrated significant differences between the patients reporting joint and muscle pain.

Adult↗
PubMed1992

Clinical evaluation of fifty-six patients referred with symptoms tentatively related to allergic contact stomatitis.

During a 7-year period, 56 patients were referred to the Department of General Pathology and Internal Medicine and the Department of Dental Materials, University of Amsterdam, to determine whether contact allergic reactions to dental materials were the cause of their complaints. On the first consultation with the patient a detailed history focusing on the complaints themselves, general medical history, and special clinical history of allergic skin reaction was obtained. Oral examinations were performed, and all patients were referred to the allergy clinic at the department of dermatology for skin tests. There was a strong female predominance in the referred group. Most of the patients with allergic contact stomatitis mentioned a burning sensation in the mouth. In only 16 of the 56 patients could the diagnosis of allergic contact stomatitis be established. From this study it can also be concluded that the combination of a positive allergic history and positive allergic skin reactions with or without visible oral signs are important for the diagnosis of allergic contact stomatitis.

Acrylic Resins↗
PubMed1989

Quantification and distribution of lymphocyte subsets and Langerhans cells in normal human oral mucosa and skin.

Normal human oral (check) mucosa was studied to discover whether the oral cavity resembles the Mucosal Immune System (MIS) or the Skin Immune System (SIS). Immunophenotypes of lymphocyte subsets and Langerhans cells (LC) with their exact locations in the epithelium and papillary layer of the normal buccal mucosa were determined and compared with data of normal human skin. In a double staining procedure, the distribution of T-lymphocytes in relation to blood and lymph vessels was determined. Immunophenotyping of LC was done with a CD1a monoclonal antibody. In contrast to the skin, T-lymphocytes in buccal mucosa are not primarily perivascular in location. They are more or less randomly distributed on both sides of the basement membrane. The epithelium of the buccal mucosa contains about 37 times as many T-lymphocytes as the epidermis of normal skin. T-cell numbers in the papillary layer are more or less comparable. The CD4/CD8 ratios of about 1/2 in the epithelium of buccal mucosa and 1/4 in the skin indicates preferential presence of the CD8 subset in both sites, but the helper/inducer T-lymphocytes play a much greater role in the epithelium of the buccal mucosa when compared with skin. B-lymphocytes were not found in the epithelium and papillary layer of the buccal mucosa. Thus, immune response associated cells in buccal mucosa do not show the MIS pattern since B cells are absent. It has more in common with SIS but differences are also apparent. In the epithelium of the buccal mucosa the density of LC does not differ significantly from that of the skin, but the papillary layer of the buccal mucosa contains significantly fewer LC than the skin. As in the skin most of the LC of the buccal mucosa are found in the epithelium.

Adult↗
PubMed1988

Contact allergy to denture materials in the burning mouth syndrome.

Several factors may be responsible for stomatitis in general and the burning mouth syndrome in particular. The results of patch testing are reported in 4 patients with burning mouth symptoms thought to be due to sensitization to denture material. 2 patients reacted to substances in Luxene dentures, but the allergens were not identified. In a 3rd patient, sensitization was found to monomeric methyl methacrylate. The other patient gave positive patch tests to epoxy resin (and bisphenol A), probably present in glue used for repair of dental plates. To obtain a complete diagnosis in cases of suspected contact stomatitis due to allergens in dentures, a reliable standard test series is required.

Aged↗
PubMed1988

T-lymphocyte and Langerhans cell distribution in normal and allergically induced oral mucosa in contact with nickel-containing dental alloys.

An in vivo comparison was made between the contact allergic stomatitis-inducing capacity of nickel, nickel-containing dental alloys and a non-corrosive precious metal. Fifteen patients with a positive allergic skin reaction to nickel were divided into 3 groups (A, B and C). The patients in Group A (n = 4) were fitted with an intra-oral corrosion-resistant nickel-chromium Alloy A; the patients of Group B (n = 5) received a more corrosion prone nickel-chromium Alloy B and in Group C (n = 6) strongly corroding pure nickel was used. A corrosion-resistant foil of pure palladium was placed on the contralateral side. Reactivity of pure nickel foil was also tested on the skin in Group C. Immunohistological examination of the oral mucosa on the test and reference sides was performed with monoclonal antibodies directed against T-lymphocyte subsets and Langerhans cells (LC). The results showed that at the pure nickel site the LC did increase significantly in the connective tissue (approx. 4X) of the oral mucosa. However, statistical analysis of all 6 patients of Group C together showed no corresponding increase of LC in the epithelium at the site with the pure nickel, although a numerical increase of LC was noted in the epithelium adjacent to the pure nickel foil in 2 patients, which was remarkable. It can be concluded from statistical analysis that both the reference foils and the test foils can influence the number of suppressor/cytotoxic T-lymphocytes in the connective tissue.(ABSTRACT TRUNCATED AT 250 WORDS)

Cell Count↗
PubMed1986

Test battery for metal allergy in dentistry.

Some alloys used in restorative dentistry may evoke an allergic contact stomatitis in certain persons. In order to protect patients from materials with undesired reactions, and considering corrosion characteristics of different alloys used, it is useful to devise an adequate patch test battery to include the most relevant metals. Dental alloys are composed of a combination of various metals. 12 different ions of frequent occurrence (Au3+, Pd2+, Zn2+, Mo6+, Sn2+, Ga3+, In3+, Co2+, Cr3+(6+), Ni2+, Fe2+(3+) and Si4+) were epicutaneously tested as the aqueous solution of the respective salt. The concentrations are given in g/100 ml and also in m.mole/l. The 12 different metal ion solutions were patch tested on patients in 3 groups: one group with a positive history of contact stomatitis (30 patients, group 1), one group with a positive history of contact dermatitis (16 patients, group 2), and a control group (17 persons, group 3). In contrast to the control group, a remarkable high percentage (11%) of positive skin reactions to Pd was found in groups 1 and 2. No allergic or irritant skin reactions were detected to Ga, Sn and Zn. No irritant reaction was observed at pH values as low as 1.5. In the case of SiCl4 (pH = 0.5), 41% positive irritant reactions were evoked. In the group with a positive history of contact dermatitis (group 1), a positive reaction was found more often (69%) than in the group with a positive history of contact stomatitis (30%) (group 2). The difference between these groups was mainly caused by reactions to Ni and Pd.(ABSTRACT TRUNCATED AT 250 WORDS)

Dental Alloys↗
PubMed1984

Contact stomatitis and dermatitis to nickel and palladium.

17 subjects were tested epicutaneously with 22 materials, including Ni, Pd, Cr and Co. 5 subjects with a positive allergic skin reaction to Ni were tested with a pure metallic nickel plate 3 X 5 mm, which was attached to the buccal side of one lower premolar. These 5 subjects all developed local allergic contact stomatitis on the mucosa of the cheek adjacent to the metal plate. This was confirmed histologically. The same oral test with pure metallic palladium gave no reaction in subjects with a positive patch test. A control group gave no reactions to the metal plates. Allergic contact stomatitis was diagnosed with the help of both clinical and histological examinations.

Dental Materials↗