Biomedical subjects

M Helkimo

Publications and source records attributed to M Helkimo.

At least 37 records · Page 2Linked to original sources

PubMed1978

Recording of the retruded position of the mandible in patients with mandibular dysfunction.

The precision (reproducibility) of active and passive recordings of the retruded position of the mandible was studied by two examiners on 10 patients with mandibular dysfunction symptoms. The position of the mandible was recorded with an intra-oral graphic method, before and after treatment of the symptoms. The precision of the recording was highest when the retruded position was recorded by passive hinge movement and lowest when it was recorded by active hinge movement and when recording habitual closure. Both systematical and accidental errors tended to be somewhat larger among these patients than that previously found among individuals without signs or symptoms of mandibular dysfunction. The accidental errors in antero-posterior and medio-lateral directions were the same fo both examiners and of the same magnitude before and after treatment of the symptoms. Both examiners recorded the retruded position on the average 0.20 mm more posterior after treatment than before. The results showed that because of its good reproducibility the retruded position of the mandible can be recommended as a reference position in functional analysis of occlusion and for jaw recordings also in patients with TMJ muscle-pain dysfunction symptoms. During the recording the conventional technique with passive hinge movement and a posterior pressure should be used.

Adult↗

PubMed1978

Chewing efficiency and state of dentition. A methodologic study.

Chewing efficiency, defined as the ability to grind a certain portion of a test food during a given time, was tested in 139 Skolt Lapps, ages 14-65. 94 persons had natural teeth and the remaining 45 wore dentures (partial and/or complete). The test food was almonds. Number of chewing strokes, swallowings and chewing time was denoted. The chewing efficiency was classified after a scale from 1 to 5 where 1 meant very good and 5 very poor ability to reduce the particle size of the test food. Clear associations were found between chewing efficiency and dental state. Number of occluding pairs of teeth was closely correlated with chewing efficiency and individuals with less than 20 teeth had a higher index score than those with more than 20 teeth. The values noted for number of chewing strokes, swallowings and chewing time were smaller for those with a good chewing efficiency, but the variation was not linear and not always significant. Denture wearers had statistically significantly higher chewing efficiency score than those with natural teeth, without dentures, and needed more chewing time before swallowing.

Adolescent↗

PubMed1978

Multiple myeloma involving the temporomandibular joint: report of case.

A case of multiple myeloma was reported in which the initial symptom was pain and dysfunction of the TMJ that resulted from pathological fracture of the mandibular condyle. An initial radiographic skeletal survey showed no evidence of further lesions, although hematological and biochemical tests indicated a diagnosis of multiple myeloma. Treatment resulted in improvement of symptoms and of an evident regression of the lesion after 18 months. After a year, however, radiographs disclosed generalized skeletal involvement; deterioration of the general condition followed.

Fractures, Spontaneous↗

PubMed1977

Bite force and state of dentition.

The maximal bite force and the strength of the finger-thumb grip of 125 Skolt Lapps, aged 15 to 65, was measured with a specially devised apparatus. The bite force was measured with the biting fork placed between the first molars and between the incisors, respectively. The finger-thumb grip was measured by letting the subject press the prongs of the fork between the thumb and forefinger of each hand as hard as possible. The range of inter-individual variation of the maximal bite force and finger-thumb grip was great. The mean values were higher for the males than for the females. In the males the maximal bite force thus measured in the molar region was 39 kg (382 N) and 18 kg (176 N) in the incisor region. The corresponding values for the females were 22 kg (216 N) and 11 kg (108 N). The finger-thumb grip strength for males was, on the average, 10 kg (98 N); that of the females, 7 KG (69 N). The average difference in bite force between the men and the women was larger in the group with natural teeth than in the one with complete dentures. The values found for the bite force decreased with increasing age, especially for the females. Most of this reduction with increasing age was probably due to the age-dependent deterioration of the dentition. In both sexes the bite force was notably smaller among the denture wearers than among the dentate persons. The number of natural teeth varied closely with the bite force, i.e. the greater number of natural teeth the greater the bite force.

Adolescent↗

PubMed1976

Epidemiological surveys of dysfunction of the masticatory system.

Findings in epidemiologic studies referred to in this review appear to warrant the following conclusions: 1. Symptoms of dysfunction of the masticatory system are very common in unselected materials - much more common than hitherto assumed. This implies that dentists in the future must interest themselves more than hitherto for diagnosis and treatment of functional disturbances of the masticatory system in general practice. 2. There are no differences in frequency of dysfunction between men and women in the general population. Why women dominate in patient materials has not been convincingly explained in the literature. 3. Symptoms of mandibular dysfunction have been found in perons in all age groups. The slight differences as to age distribution reported, indicate more frequent symptoms in old individuals than in young ones. 4. No predominant etiologic factor of dysfunction of the masticatory system has been found in the population studies. Various factors are obviously involved in the etiology of functional disorders. A certain correlation between the degree of dysfunction and the general state of health and the number of residual teeth has, however, been demonstrated. Besides occlusal disturbances and psyhic factors the general health therefore should be observed as an important variable in mandilular dysfunction. 5. In order to faciliate future comparisons between different materials and interpretation of results it is necessary to use the same dignostic criteria and to collect data by reference to suitalbe induces permitting assessment of the prevalence of different symptoms with their severity. 6. With the aid of a generally accepted dysfunction index it should be possible further to elucidate the still many obscure aspects of the etiology and further course of dysfunctional diseases of the masticatory system in clinical materials and population studies. 7. More epidemiologic research of different populations is necessary to increase our knowledge in this field.

Adolescent↗

PubMed1974