Det odontologiske fakultet

Odontologisk institutt, Røntgendiagnostikk

Produksjonsdato : 2001-02-02
Katalogtype: Fullformat.

1
PublKat: A11 (Artikkel i internasjonalt vitenskapelig tidsskrift med referee)
Instit:  Universitetet i Bergen, Det odontologiske fakultet, Odontologisk institutt, Røntgendiagnostikk
Forf:    Forsberg, J.
Medforf: Halse, A.
Tittel:  Radiographic simulation of a periapical lesion comparing the paralleli
         ng and the bisecting-anggle techniques.
Tidskr:  International endodontic journal
ISSN:    0143-2885
År:      1994
Volum:   27
Side(r): s. 133-138
Emneord: dental radiology, endodontics
SamNor:  eixty apical areas of single-rooted teeth were examined in this study
         . A simulated periapical lesion was produced using an acrylic sphere
         (diameter 2.0 mm), the surdace of which was covered with a thin layer
          of zinc cement. The sphere was placed in close contact with the apic
         al foramen using a thin orthodontic wire inserted into the apical por
         tion of the root canal. The correctly adjusted parallel projection de
         picted the simulated lesion with a very low degree of error. Overangu
         lation of the central beam with maintenance of parallelism between to
         oth and film resulted in a moderate degree o f magnificcation. When c
         orrevtly adjusted, the bisecting-angle technique produced images with
          almost the same accuracy as the paralleling technique. Over-angulati
         on resulted in most images showing a reduced size of the simuluated l
         esion. Moderate under-angulation most often recorded the correct dime
         nsion of the globe. In some cases a magnified image of sphere was pro
         duced. Generally, this was associated with a palatally curved root. T
         he investigation thus clearly indicated that the paralleling techniqu
         e provides the most reliable information about the extent of a pathol
         ogical process.
Språk:   eng
PublID:  r95003179
StatKat: f

2
PublKat: A11 (Artikkel i internasjonalt vitenskapelig tidsskrift med referee)
Instit:  Universitetet i Bergen, Det odontologiske fakultet, Odontologisk institutt, Røntgendiagnostikk
Forf:    Halse, A.
Medforf: Espelid, I.
Medforf: Tveit, A.B.
Medforf: White, S.C.
Tittel:  Detection of mineral loss in approximal enamel by subtraction radiogra
         phy.
Tidskr:  Oral surgery, oral medicine and oral pathology
ISSN:    0030-4220
År:      1994
Volum:   77
Side(r): s. 177-82
SamNor:  The purpose of the present study was to determine whether digital sub
         traction radiography will improve detectability of small, mechanicall
         y prepared defects within dental enamel. Lesions with an extent of 1
         mm in vertical direction and representing 5% to 10% mineral loss in t
         he direction of the x-ray beam were prepared in eight extracted molar
         s. Radiographs ofteeth with defects were subtracted from radiographs
         taken before the lesions were prepared. Seven observers evaluated the
          images using a five-point confidence rating scale (receiver operatin
         g characteristic technique). Examination of the original radiographs
         showed increasing accuracy of radiographic interpretation with increa
         sing mineral loss as judged from the areas beneath the receiver opera
         ting characteristic curves. The same observation was made using subtr
         action images with and without contrast enhancement. There was no ind
         ication that s ubtracted images provided better diagnostic validity t
         han the original radiographs. In conclusion, subtraction images do no
         t seem to improve the diagnosis of well-defined lesions with in denta
         l enamel.
Språk:   eng
PublID:  r95003224
StatKat: f

3
PublKat: A11 (Artikkel i internasjonalt vitenskapelig tidsskrift med referee)
Instit:  Universitetet i Bergen, Det odontologiske fakultet, Odontologisk institutt, Røntgendiagnostikk
Forf:    Midtbø, M.
Medforf: Halse, A.
Tittel:  Root length, crown height, and root morphology in Turner syndrome.
Tidskr:  Acta odontologica scandinavica
ISSN:    0001-6357
År:      1994
Volum:   52
Side(r): s. 303-314
Emneord: anatomy, tooth, X-chromosome
SamNor:  Rooth length, crown height, and root morphology were studied on intra
         oral and panoramic radiographs in 33 Turner syndrome patients aged 7.
         0-16.7 years, subdivided on the basis of karyotype. Thirtythree norma
         l girls aged 10.2-16.4 years served as controls. In the 45X patients
         and, with the exception of a few teeth, also in the isochromosome and
          mosaic karyotypes, root length and crown height of incisors, canines
         , and premolars were significantly reduced. Some teeth showed altered
          crown-root proportions. Maxillary first premolars showed a significa
         ntly increased number of two-rooted and three-rooted variants. Mandib
         ular premolars and molars has a complex root morphology, and a classi
         fication system was established including four premolar and six molar
          root types. Premolars had a significantly increased number of root c
         omponents. Some of the variants, such as a molar-like second premolar
         , are apparently specific for these patients. On several first molars
          a radix entomolars was identified. Two separate mesial and one or tw
         o separate distal root were also frequently seen. Our investigation d
         emonstrates that X-chromosome deficiency influences root formation.
Språk:   eng
PublID:  r95003232
StatKat: f

4
PublKat: A11 (Artikkel i internasjonalt vitenskapelig tidsskrift med referee)
Instit:  Universitetet i Bergen, Det odontologiske fakultet, Odontologisk institutt, Røntgendiagnostikk
Forf:    Midtbø, M.
Medforf: Halse, A.
Tittel:  Tooth crown size and morphology in Turner syndrome.
Tidskr:  Acta odontologica scandinavica
ISSN:    0001-6357
År:      1994
Volum:   52
Side(r): s. 7-19
Emneord: anatomy, tooth, X-chromosome
SamNor:  The aims of this investigation were to analyze permanent tooth crown
         size and morphology and to perform symmetry analysis between correspo
         nding teeth on the right and the left side. The material comprised 32
          Turner syndrome patients aged 7-16.7 years. As controls served 33 no
         rmal girls 10.2-16.7 years old. The mesiodistal diameter was signific
         antly reduced for every tooth measured except for the maxillary canin
         e. 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 lo
         wer frequency. Some of the traits have not been described earlier for
          this group of patients. There was a significant difference between T
         urner and control patients both in the number of patients with bilate
         ral tooth asymmetries and in the number of corresponding tooth pairs
         in the maxilla with bilateral asymmetri. No significant differences w
         ere found between the 45X patients and the other karyotypes. Maxillar
         y central incisors showed a surprisingly high relative frequency (38.
         5) of bilateral asymmetry.
Språk:   eng
PublID:  r95003230
StatKat: f

5
PublKat: A11 (Artikkel i internasjonalt vitenskapelig tidsskrift med referee)
Instit:  Universitetet i Bergen, Det odontologiske fakultet, Odontologisk institutt, Røntgendiagnostikk
Forf:    Skartveit, L.
Medforf: Riordan, P.J.
Medforf: Dallal, E.
Tittel:  Effect of fluoride in amalgam on secondary caries incidence.
Tidskr:  Community dentistry and oral epidemiology
ISSN:    0301-5661
År:      1994
Volum:   22
Side(r): s. 122-5
Emneord: Bahrain, dental caries, dental restorations, filling material, fluori
         de, dental amalgam
SamNor:  Caries incidence is falling in many developed countries but is believ
         ed to be increasing in developing countries. Insofar as treatment for
          caries is provided, ordinary amalgam restorations are usually the st
         andard choice. These carry a risk of failing due to secondary caries.
          The aim of this study was to compare the occurrence of secondary car
         ies adjacent to fluoride-containing amalgam with that adjacent to a c
         onventional amalgam under field conditions in Bahrain. Children (n=41
         5) aged 6-14 yr who required occlusal restiorations in two homo logou
         s contralateral permanent molar teeth were identified. Using the spli
         t-mouth design, one tooth received a fluoridecontaining amalgam filli
         ng and the other a conventional amalgamrestoration. A random method w
         as used to determine which type of filling was placed on each side. A
         fter 4 yr, 357 children were still available for examination; of thes
         e 5 had to be eliminated from analysis for various reasons. Of the 70
         4 teeth in the analysis, secondary caries had occurred in 135 (86 con
         ventional amalgam, 49 fluoridated amalgam). By comparison with the co
         nventional amalgam, the effectiveness of the fluoride amalgam was 43%
          (95% C.I. 24.4%, 57.1) and the net gain 10.3% (95% C.I. 4.75%, 16.3
         ). The relative risk was 0.570 (95% C.I. 0.444%, 0.731). Since fluo
         ride amalgam has identical handling properties to conventional amalga
         m, performs similary under clinical conditions and costs about the sa
         me, it should be the amalgam of choice for restorations in communitie
         s where the incidence of secondary caries is high.
Språk:   eng
PublID:  r95003236
StatKat: f


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