PubMed Health⌕ Search

Biomedical subjects

A Halse

Publications and source records attributed to A Halse.

At least 37 records · Page 2Linked to original sources
PubMed1994

Tooth crown size and morphology in Turner syndrome.

The aims of this investigation were to analyze permanent tooth crown size and morphology and to perform symmetry analysis between corresponding teeth on the right and the left side. The material comprised 32 Turner syndrome patients aged 7-16.7 years. As controls served 33 normal girls 10.2-16.7 years old. The mesiodistal diameter was significantly reduced for every tooth measured except for the maxillary canine. The buccolingual dimension was reduced only for some teeth. Eleven morphologic traits were defined. Ten of these were identified in the Turner patients; seven occurred in the controls as well, but at a lower frequency. Some of the traits have not been described earlier for this group of patients. There was a significant difference between Turner and control patients both in the number of patients with bilateral tooth asymmetries and in the number of corresponding tooth pairs in the maxilla with bilateral asymmetry. No significant differences were found between the 45X patients and the other karyotypes. Maxillary central incisors showed a surprisingly high relative frequency (38.5%) of bilateral asymmetry.

Adolescent↗
PubMed1992

Digital subtraction radiography after stannous fluoride treatment for occlusal caries diagnosis.

The material in this study consisted of 38 fully erupted, extracted third molars without clinical cavitation in the occlusal surface. A radiograph was made of each tooth before and after 5, 10, and 20 minutes of stannous fluoride treatment. The radiographs were digitized and subtraction performed between the images obtained after stannous fluoride treatment and the pretreatment image. Two observers assessed the stannous fluoride treated radiographic and the subtraction images on a monitor: 0 = no change, 1 = intensity increase (white area interpreted as a carious lesion) in dentinoenamel area. Caries was assessed on conventional film radiographs made before treatment: 0 = no caries in dentin, 1 = caries in dentin. The presence of caries in dentin was validated histologically. Sensitivity for intensity increase as a sign of caries was overall higher for the subtraction images based on 20-minute treatment than for the radiographic images (0.025 > p > 0.01) but not significantly higher than for the conventional radiographs. However, neither observer gave false-positive scorings in the subtraction images, whereas observer 1 had five false-positive scorings on the conventional films. Observer 2 had none. The subtraction method did not provide a higher sensitivity for dentinal occlusal caries than conventional film radiography, but the intensity increase could be trusted more than the traditional radiolucency as a sign of a dentinal lesion.

Adolescent↗
PubMed1992

Skeletal maturity, dental maturity, and eruption in young patients with Turner syndrome.

A major problem for patients with Turner syndrome is their small body height. The rapid biotechnologic development has now made treatment with growth hormone possible at a larger scale. The aim of this investigation was to evaluate skeletal maturity, dental maturity, and eruption in a group of young patients before hormone therapy. The material comprised 33 patients aged 7-16.7 years. The skeletal maturity, as judged from hand radiographs, was on an average 2.3 years retarded (p < 0.001) and showed increasing retardation with increasing age. The dental maturity, assessed from the formation stages of the permanent teeth on panoramic radiographs, was accelerated, with a mean value of 1 year (p < 0.001). The timing of clinical eruption did not differ significantly from that of our reference material; the Turner girls were on an average 3.7 months ahead. Several patients had local eruption problems, especially in the maxillary lateral segments. It is suggested that disharmony between tooth size and arch size may contribute to this problem.

Adolescent↗
PubMed1991

Follow-up after periapical surgery: the value of the one-year control.

A total of 474 teeth treated with periapical surgery were examined after one year. Complete healing was unequivocally demonstrated for 250 teeth. Two hundred and fourteen teeth were scheduled for further follow-up, and of these, 194 (91%) could be followed until a stable situation was recorded. Of 41 cases judged as completely healed after one year, but with initial observer disagreement, only 2 (5%) failed later. The 76 cases showing incomplete healing (scars) after one year with few exceptions ended as completely healed or persisted as incomplete healings. The uncertain group (n = 72) was equally re-distributed as successes (completely or incompletely healed) or failures at the end control. Five cases showing no healing after one year all ended as failures. Based on these findings it is concluded that the one-year control will provide a valid diagnosis for the majority of cases. Only a minor number, the uncertain healings, need further follow-up.

Adolescent↗
PubMed1991

Surgical management of endodontic failures: indications and treatment results.

Two-hundred and twenty-four teeth with failures after conventional endodontic treatment were treated by periapical surgery by one surgeon and followed up for 1-8 years. Indications for surgery were: inaccessibility to the apical part of the root by a coronal approach due to posts, calcifications or procedural accidents. Cysts, a few acute cases and wide-open apices were also treated surgically. Healing was judged radiographically and classified into one of four healing groups: (1) complete healing, (2) incomplete healing (scar tissue); (3) uncertain healing, and (4) unsatisfactory healing. The grouping was performed separately by the oral surgeon and an endodontist. Deviating cases were then evaluated jointly, difficult cases and borderline cases were judged by an oral radiologist. Complete healing was observed for 76.6 per cent and incomplete healing (scar tissue) for 8.1 per cent of the teeth. The size of the latter group was strongly influenced by the number of cases with large preoperative rarefaction. A success/failure grouping of the material (success = complete and incomplete healing) revealed that 27 per cent of the retrofilled cases failed compared with 3.6 per cent in the orthograde group. The main conclusion is that retrofills should be avoided whenever possible.

Apicoectomy↗
PubMed1990

Visualization of stannous fluoride treatment of carious lesions by subtraction radiography.

To determine whether treatment with SnF2 results in changes in radiographic density, eight extracted teeth with lesions confined to the enamel and five with lesions extending into the dentin were radiographed before and after treatment with a 10% SnF2 solution. Although visual comparison of pretreatment and post-treatment radiographs showed increased density in some areas where the pretreatment radiographs had shown demineralization and unchanged conditions in other instances, subtraction images of these radiographs revealed density increase in all the demineralized areas. Even in cases with white spot lesion not visible on radiographs, the subtraction images disclosed an increase in radiographic density.

Dental Caries↗
PubMed1990

Periapical surgery in a Norwegian county hospital: follow-up findings of 477 teeth.

Four-hundred seventy-seven teeth treated by periapical surgery by one surgeon were followed up until a stable radiographic situation was recorded. Radiographic findings were classified into one of four groups: 1, complete healing; 2, incomplete healing (scar tissue); 3, uncertain healing; or 4, unsatisfactory healing. Evaluation was performed independently by an endodontist and the oral surgeon and cases of disagreement were subjected to joint evaluation. Difficult cases and borderline cases were judged by an oral radiologist. Complete healing was observed for 78% and incomplete healings (scar tissue) for 9% of the teeth. The size of the latter group was strongly influenced by the number of cases with large preoperative lesions. When the material was grouped as "success" (complete healing, scar tissue healing) and "failure" (uncertain healing, unsatisfactory healing), a 13% failure frequency was recorded. Twenty-eight percent of the cases treated with retrograde fills failed compared with 4% in the orthograde group.

Adult↗
PubMed1989

A clinical and roentgenological study of 55 cases of root perforation.

The treatment outcome of 55 root perforations in man were related to pretreatment conditions and various treatment procedures used, with a mean recall period of 3 years 5 months. In this study maxillary teeth were perforated three times more often (74.5 per cent) than mandibular teeth (25.5 per cent); 47 per cent of the perforations were due to endodontic and 53 per cent due to prosthodontic treatment. The buccal and mesial root surfaces as well as the midroot areas were most often perforated. In 25 per cent, radiographic changes were directly related to the perforated areas. Twenty-eight perforations were repaired by orthograde fillings with gutta-percha and Kloro-percha N-phi; eight received a combined orthograde and surgical repair, and in only three cases a surgical approach was used. Four cases received no treatment but were recalled, and twelve perforations showed a size and location hopeless for repair; the teeth were therefore extracted. Five failures of the primary orthograde treatment group later underwent surgical treatment and were followed up for 3 years 3 months. The overall success rate in the primary treatment group of teeth was 56 per cent while 36 per cent became failures. Five failures were retreated, and four of these became successful. A combined orthograde and surgical repair of the perforations provided the most favourable outcome with 92 per cent successful. The study stresses the importance of preventing this type of treatment complication.

Humans↗
PubMed1987

Observer strategy and the radiographic classification of healing after endodontic surgery.

An observer strategy involving trained and experienced examiners was used in a large series of endodontic surgery cases, evaluated radiographically 1 year after the operation. The cases were grouped in 1 of the following 4 healing groups; complete healing, incomplete healing (scar tissue), uncertain healing and unsatisfactory healing (failures). The radiographs were first examined separately by an oral surgeon and an endodontist. Deviating cases were subjected to joint evaluation. The overall agreement before joint interpretation was satisfactory: 63% when corrected for chance agreement. Agreement after joint evaluation reached 94% of the total material. Disagreement and difficult borderline cases were judged by an oral radiologist. He was more pessimistic than the 2 main examiners. The identification of healed cases with apical bone which had not yet obtained normal radiopacity and structure was difficult. Altogether, the observer consistency was satisfactory; the selection of experts increased the chances of "true" diagnoses; the important screening function of the one-year control was confirmed. The applied strategy and the classification are recommended for follow-up studies.

Classification↗
PubMed1987

Overextended gutta-percha and Kloroperka N-O root canal fillings. Radiographic findings after 10-17 years.

A representative sample, 55%, of the patients treated endodontically by undergraduate students in a teaching clinic during the years 1963 to 1969 were reexamined 10-17 years later. Gutta-percha/Kloroperka-NO root fillings (282), classified as having surplus material at the time of treatment, were evaluated in follow-up radiographs. In about 80% of the cases of overfilling, no excess root filling material could be traced at the reexamination. In a few cases only, the appearance of the excess material was nearly identical to that at the time of treatment, whereas the remaining overfillings (18%) showed a reduced size. Among the recorded variables only one seemed to have a major impact on the prognosis--namely, the presence or absence of an apical radiolucency at the time of treatment, indicating that infection was the important factor when failures occurred. Apical overfilling per se had little influence on the long-term healing result as judged radiographically.

Adolescent↗
PubMed1985

Number of teeth and tooth loss of former dental school patients. Follow-up study after 10-17 years.

Persons (n = 431) who had received endodontic and other treatment at the School of Dentistry in Bergen in the 1960s were invited to attend an examination in 1980, some 10-17 years after their first course of treatment. The age range initially had been 16-55 years. The attendance rate was 55% (149 women and 89 men) and was higher for the older age groups. Data from pre- and post-treatment records were added to the information obtained in 1980. Those who attended in 1980 had had 22.8 teeth at the initial examination and 21.2 teeth after their first course of treatment in the 1960s. In 1980 they had 19.3 teeth. About 20% of the persons had the same number of teeth at all three examinations, and 43% had not lost teeth after completing treatment at the school. Molars and maxillary teeth were most likely to have been extracted. This was also the case for teeth lost during the first course of treatment. Some 4% of the individuals had become edentulous. Conventional dental treatment had not prevented further tooth loss; the number of remaining teeth within each age group was about the same in 1980 as in the 1960s.

Adult↗
PubMed1982

The effect of a NaF solution and a fluoride varnish on the acid resistance of root dentin.

Sectioned root dentin surfaces were treated with either a NaF solution for 10 min or a fluoride varnish for 48 h and then exposed to 1 M acetate buffer pH 5.8 for 20 h. Microradiographs of non-fluoride treated specimens (controls) regularly showed a partially demineralized zone extending from the surface. The NaF-treated specimens exhibited a lesion with alternating radiopaque and radiolucent zones, which had a mean total depth equal to that of the controls. The varnish-treated specimens showed a demineralized zone which was significantly less deep than those observed in the two other groups. Elemental analyses performed by an electron microprobe showed a positive correlation between the amount of F incorporated and the acid resistance of the tissue.

Acetates↗