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Biomedical subjects

B Hedegård

Publications and source records attributed to B Hedegård.

At least 19 recordsLinked to original sources
PubMed1989

The silent period in the masseter and the anterior temporalis muscles in adult patients with mild or moderate mandibular dysfunction symptoms.

The electromyographical silent period in the masseter and the anterior temporalis muscles during tooth tapping and jaw jerk were studied in patients with fairly mild temporomandibular joint dysfunction symptoms. The length of the silent periods in the patient group did not differ generally from that in a control group. During tooth tapping, however, patients with distinct muscular disorders had shorter silent period duration (7.7 ms) than patients with other symptoms or when compared with control subjects (10.5 and 11.3 ms, respectively). The duration returned to normal after correction of the muscular disorders. This finding suggests that the duration of the silent period is affected by the muscle condition. Patients with obvious muscular disorders of mild to moderate magnitude, thus, may show a shorter silent period duration during tooth tapping.

Adult↗
PubMed1988

The silent period in the masseter and anterior temporalis muscles in young adult subjects unaware of mandibular dysfunction symptoms.

In fourteen individuals unaware of mandibular dysfunction symptoms, latency and duration of the silent period in the masseter and anterior temporalis muscles at tooth tapping and jaw jerk were reasonably reproducible after 5 weeks and 5 months. Although the subjects felt no discomfort in the stomatognathic system, in some of them mild to moderate muscle tenderness, TMJ sound and occlusal disharmony were found at clinical examination. The relationship between these symptoms and the silent period was analysed. Muscle tenderness was the only factor to affect the silent period. The subjects with muscle soreness had a shorter duration of the silent period than the subjects without such symptoms.

Adult↗
PubMed1987

Clinical findings in patients with orofacial discomfort complaints.

In 113 patients with orofacial and general complaints, which they assumed were caused by galvanic currents and/or metallic restorations, clinical dental and medical examinations were performed. Most of the patients had natural teeth with dental metallic restorations. A number of dental diagnoses, such as caries, pulpitis, periapical osteitis and periodontitis, were found. However, 16% were edentulous in one or both jaws and had complete dentures. 69% had possible metal contacts. Some oral mucosal changes were observed, but they were as frequent in patients without as in those with metal contact possibility. Signs of parafunctions and functional disturbances of the masticatory system were extremely frequent. A careful oral examination in these patients thus revealed many clinical dental and oral signs that could be more-or-less related to the complaints. Because of the extremely varying symptoms reported, however, only a small proportion could be fully explained by odontological and/or medical diagnoses, and in 38% of the patients, no clear odontological diagnosis was found that could explain the complaints.

Adult↗
PubMed1987

Outcome of treatment of patients with orofacial discomfort complaints.

In 113 patients with a wide variation of orofacial and general complaints, which they assumed were caused by galvanic currents and/or metallic restorations, the initial and long-term development (3 years) after treatment was studied. Many treatment procedures were tried; besides information and follow-ups, each patient underwent in average of 6.6 different measures. The often time-consuming treatment was individualized, based on each patient's signs and symptoms. Besides conventional dental treatment, stomatognathic therapy and medical treatment which were frequently needed, metallic constructions were removed in 54% of the patients. The initial outcome of treatment was evaluated as successful both by patients and therapists in about 80%, but half of the patients reported recurrences, more often after removal of metallic constructions than after other dental treatment, while the dentists found recurring clinical signs in only 13% of the patients and without correlation to type of treatment. It is concluded that these patients need a careful oral examination and dental treatment of observed local pathology and defects of dental constructions, but removal of metallic constructions should be avoided when not indicated. Many of these patients will also need medical consultation and treatment, and a collaboration between the dentist and the physician is then recommended.

Combined Modality Therapy↗
PubMed1986

Reported symptoms, diseases, and medication of patients with orofacial discomfort complaints.

This paper is a part of a series of studies of 113 patients with orofacial and general complaints which they assumed were caused by metallic dental restorations and/or oral galvanic currents. An extensive case history was taken by means of a questionnaire and an interview. The results showed that the patients reported widely varying symptoms, both oral and general, such that the polysymptomatic character of the patients cannot be explained by a single etiologic factor. It is probable that many general factors, besides oral findings, alone or in combination, e.g. general health problems, side effects of medication, psycho-social problems including stressful life events, and complications due to the chronicity of pain, may be associated with the oral and general complaints of these patients.

Adult↗
PubMed1986

Contact allergy to dental materials in patients with orofacial complaints.

Two groups of individuals were patch tested for frequencies of contact allergy to dental materials. The patient group with orofacial and distant symptoms and complaints referred to the Department of Prosthetic Dentistry were compared with an age-sex matched control group of individuals referred to the Department of Dermatology. The results did not show any differences in patch test reactions between the patient and control groups. The study did not prove any obvious associations between the patients' symptoms or objective findings and the patch test results.

Adult↗
PubMed1986

An examination of the surface corrosion state of dental fillings and constructions. I. A laboratory investigation of the corrosion behaviour of dental alloys in natural saliva and saline solutions.

Electrochemical measurements on amalgams and gold alloys in natural saliva and saline solutions have been performed. The results show strong inhibiting effects of some components in natural saliva on the surface corrosion behaviour of amalgams. For the gold alloys the cathodic reduction of oxygen was notably lower in natural saliva than in saline solutions. For galvanic combinations of gold and amalgams substantially lower currents than those calculated from thermodynamic data can be expected in natural saliva.

Corrosion↗
PubMed1986

An examination of the surface corrosion state of dental fillings and constructions. II. A clinical study on patients with orofacial complaints.

A group of 115 patients with orofacial complaints has been examined. A new method for intraoral measurement of electrode potentials on the surface of the amalgam fillings and prosthetic constructions has been developed and applied. The possible connections between the measured electrode potentials and patients' saliva properties and their complaints have been discussed. No correlations between measured electrode potentials of the metallic fillings and constructions and important saliva properties could be found. No connections between the measured electrode potentials and the patients' complaints could be proved.

Adult↗
PubMed1986

Changes in bite force and chewing efficiency after denture treatment in edentulous patients with denture adaptation difficulties.

Masticatory function was studied by means of a chewing efficiency test and bite forces measurements in forty-nine edentulous patients who had applied for treatment with fixed protheses on osseointegrated dental implants. Registrations were performed with the original complete dentures and after treatment aiming at optimizing the dentures. The patients were divided into two groups and the post-treatment recordings were completed after adaptation periods of 2 and 6 months, respectively. The functional tests showed mainly small and non-significant changes after the denture treatment. Improvement was greater, however, in those with the poorest pre-treatment values. Chewing efficiency deteriorated after treatment in the older patients (more than 50 years) while it did not change in the younger ones. A longer adaptation period did not lead to better functional results. The findings are discussed in relation to the fact that the patients were waiting for implant treatment, with consequent psychological implications for interpretation.

Adaptation, Physiological↗
PubMed1979

Mandibular movements of young adults recorded by intraorally placed light-emitting diodes.

Mandibular chewing movements of 10 young adults were registered with LED. The registrations were performed manually, and the following observations were made: 1. The mean cycle duration was reduced from 1.12 seconds for cycle 1 to 0.76 second for cycle 16. 2. The duration of the opening phase appeared to be shorter than that of the closing phase. 3. The maximal vertical movement of the mandible decreased throughout the chewing period. The results obtained in this study agree with those reported by other investigators and indicate that a system using LED is suitable for analyzing the mandibular movement pattern in clinical situations.

Adult↗
PubMed1979

Tooth loss, prosthetics and dental treatment habits in a group of Swedish men.

Dental history, dental status, the need for prosthetic treatment and dental treatment habits were studied in 389 men aged 21--54 years. The men were selected from a group undergoing military refresher training in the south of Sweden. One percent of the men were toothless. About 3% had full dentures in one or both jaws and an equal percentage had partial dentures. About 3% of the men had bridges in the maxilla and 2% in the mandible. Tooth loss was greatest in the mandibular molar segment, followed by the maxillary molar segment. By means of an index for dental status about 8% of the men were judged to be in great need of prosthetic treatment for aesthetic reasons and/or to improve occlusion. Age, place of birth, educational level and smoking habits were among the factors which seemed to be related to dental status. Seventy percent of the men reported that they went to the dentist once a year, while about 10% seemed rarely or never to seek dental treatment. Dental treatment habits were correlated to place of birth, number of brothers and sisters, edentulousness and the need for prosthetic treatment, among other factors.

Adult↗
PubMed1977

Kinematics of the tooth tapping movement.

Electrical activity in the masseter muscles and tooth contact vibrations were recorded simultaneously from subjects tapping their teeth slowly into maximal intercuspidation and again with maximal frequency. High speed cinephotography was also used with four of the ten subjects. Three main parts could be distinguished on the obtained graphical representation of the tooth tapping movement: tooth contact phase (TCP), opening phase (OP) and closing phase (CP). Tapping frequency was increased by decreasing the jaw opening degree and the durations of TCP, OP and CP. The jaw velocity immediately before tooth contact, which may be of significance for the reflex response, was however not increased. The average jaw speed was nevertheless increased from 10 to 15 cm/s since the turning from OP to CP was more abrupt in high than in low frequency tapping. The duration of electrical activity after tooth contact was significantly shorter at tapping with high than with low frequency. The teeth maintained contact without detectable rebound between each open-close cycle. The OP started about 100 ms after the cessation of electrical activity both at low and high tapping frequency. The time between end of electrical activity and the start of a new OP was supposed to be dependent upon the relaxation time of the masseter muscles.

Adult↗