Det odontologiske fakultet

Odontologisk institutt, Kjeveortopedi

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, Kjeveortopedi
Forf:    Bjørnaas, T.
Medforf: Rygh, P.
Medforf: Bøe, O.E.
Tittel:  Severe overjet and overbite reduced alveolar bone height in 19-yearold
          men.
Tidskr:  Am J Orthod Dentofac Orthop
År:      1994
Volum:   106
Side(r): s. 139-45
SamNor:  Few investigations have reported convincing evidence of an associatio
         n between malocclusion and loss of periodontal tooth support. The con
         tradictory findings may in part be explained by the selection of mate
         rial and by method differences. In many studies not-verysevere malocc
         lusion was compared with not-very-correct occlusion. Only recently ha
         ve measuring metho ds been developed that calculate the distance betw
         een the cementoenamel junction (CEJ) and the interproximal alveolar b
         one crest (AC) to the nearest 0.01 mm with acceptable accuracy. The a
         ssociation between overjet 8 mm and the reduction of the bone suppo
         rt as expressed by the distance between CEJ and AC in 21 military rec
         ruits was compared with a peer group of 50 recruits with nearly ideal
          occlusion. The results showed a significant reduction of bone height
          (mean = 0.96 mm) of the four upper front teeth and of the four lower
          incisors (mean= 0.35 mm) in the malocclusion group. Similarly, a gro
         up of 31 army recruits with overbite 6 mm revealed a significant re
         duction of bone height of 0.71 mm of the upper front teeth and 0.49 m
         m of the lower front teeth. Overjet and overbite did not appear in co
         mbination in this material. In conlucion, alveolar bone height was re
         duced in regions with severe maloccl usion when compared with corresp
         onding regions in healthy men with near ideal occlusion. The material
          was military recruits (age 19 years).
Språk:   eng
PublID:  r95004061
StatKat: f

2
PublKat: A11 (Artikkel i internasjonalt vitenskapelig tidsskrift med referee)
Instit:  Universitetet i Bergen, Det odontologiske fakultet, Odontologisk institutt, Kjeveortopedi
Forf:    Brudvik, P.
Medforf: Rygh, P.
Tittel:  Multi-nucleated cells remove the main hyalinized tissue and start reso
         rption of adjacent root surfaces.
Tidskr:  European journal of orthodontics
År:      1994
Volum:   16
Side(r): S. 265-273
SamNor:  Recent studies revealed that the initial root resorption occurred in
         the peripheres of the necrotic periodontal ligament (PDL) and was per
         formed by mono-nucleated non-clast macrophage- and fibroblast-like ce
         lls (Brudvik and Rygh, 1993a, b). The aim of the present transmission
          electron microscopic (TEM) investigation was to study in more detail
          the cells involved in removal of the main hyalinized tissue and thos
         e involved in root resorption, occurring on the root surface situated
          beneath the main hyalinized tissue. Twelve male Wistar rats were use
         d. The maxillary first molar was moved mesially by a fixed orthodonti
         c appliance for 7 and 10 days. The results indicate that multi-nuclea
         ted giant cells (MNGC) without a ruffled border surface, as well as m
         ono-nucleated macrophage-like cells were responsible for removal of t
         he necrotic tissue and also for resorption of the surface parts of th
         e root cementum. Although the present MNGC showed many morphological
         traits similar to the observed odontoclasts and osteoclasts, except f
         or their lack of ruffled borders, it is assumed that they are derived
          from the mono-nucleated phagocytic system. Multinucleated clast-like
          cells with ruffled border were never observed near the remnants of t
         he necrotic tissue. Such cells were found only in the resorption lacu
         nae on root and bone surfaces.
Språk:   eng
PublID:  r95004059
StatKat: f

3
PublKat: A05 (Kapittel i faglig bok, rapport m.v. (t.o.m. 1998))
Instit:  Universitetet i Bergen, Det odontologiske fakultet, Odontologisk institutt, Kjeveortopedi
Forf:    Brudvik, P.
Medforf: Rygh, P.
Tittel:  Root resorption associated with orthodontic/experimental tooth movemen
         t: The initial attack and the resorption-repair sequence on root surfa
         ces exposed to compression.
Tidskr:  The Biological Mechanisms of Tooth Eruption, Resorption and
          Replacement by Implants. Z. Davidovitch (ed.).
År:      1994
Side(r): s. 557-575
Utgiver: Harvard Society for the Advancement of Orthodontics, Boston.
Emneord: orthodontic root resorption, compressed PDL, pattern, initial attack,
          different cells, repair, necrotic tissue
SamNor:  Previous research has indicated that orthodontic root resorption occu
         rs in association with removal of hyalinized tissue from a compressed
          part of the periodontal ligament (PDL) (Reitan,1951;Kvam, 1972;Rygh,
         1977;Williams,1984;Tanaka et al.,1990). The present investigation was
          undertaken in order to study the process of orthodontic root resorpt
         ion during activeforce and after the force had terminated. The aims w
         ere:(1) to explore the possibility of a pattern in the development an
         d repair of a hyalinized zone leading to root resorption,(2) to study
          the cells that invade and remove the necrotic tissue as well as thos
         e that start resorption and (3) to study the interactions between the
          cells involved in the resorptionrepair sequence. Seventy-three upper
          right first rat molars were moved mesially by means of a closed spri
         ng (Rocky Mountain, USA), for 6h, 12h, 1,2,3,4,5,7,10,14 and 21 days.
          The left untreated segments were used as control. After decalcificat
         ion, the specimens were further prepared for light (LM) and electron
         (TEM) microscopic study.The results indicated an association between
         the root resorption and active removal of the hyalinized tissue and a
          pattern of event:1) mono-nucleated fibroblast-like cells negatively
         stained by tartrate resistant acid phosphatase (TRAP),started root re
         sorption from the periphery of the main necrotic zone,2) root resorpt
         ion beneath the main hyalinized zone occurred in a later phase in whi
         ch multinucleated TRAP positive cells were involed in both removing t
         he main necrotic tissue and resorption of the adjacent root surface a
         nd 3) after the force had terminated,active root resorpti on was stil
         l observed in areas where hyalinized tissue existed provided the toot
         h was retained in its new position.Reparation of the resorbed lacunae
          occurred from the periphery.
Språk:   eng
PublID:  r95004103
StatKat: f

4
PublKat: A11 (Artikkel i internasjonalt vitenskapelig tidsskrift med referee)
Instit:  Universitetet i Bergen, Det odontologiske fakultet, Odontologisk institutt, Kjeveortopedi
Forf:    Brudvik, P.
Medforf: Rygh, P.
Tittel:  Root resorption beneath the main hyalinized zone.
Tidskr:  European journal of orthodontics
År:      1994
Volum:   16
Side(r): s. 249-263
SamNor:  A previous investigation on the initial phase of root resorption asso
         ciated with orthodontic overcompression of local areas of the periodo
         ntal ligament (PDL), indicated that a differentiation should be made
         between two stages: (1) the very first resorption occurring in the pe
         riphery of the main necrotic zone; and (2) the root resorption occurr
         ing on that part of the root surface situated beneath the main bulk o
         f necrotic tissue (Brudvik and Rygh, 1993a). The aim of the present i
         nvestigation was to study the latter stage. Attention was focused on:
          (1) the possible association between the presence of necrotic tissue
          and root resorption; and (2) the cells that invaded and removed the
         necrotic tissue, as well as the cells t hat started to remove/resorb
         the cementum. Mesial movement of the upper first molars (rats) and lo
         wer first molars (mice) was performed by a fixed orthodontic applianc
         e. The results indicate an association between the root resorption, a
         nd the presence and active removal of the hyalinized tissue. Root res
         orption beneath the main hyalinized zone occurred in areas where inva
         ding cells were observed close to the root surface. The majority of t
         he cells involved in removal of the necrotic tissue and resorption of
          the root surface were multinucleated and TRAP-positive. It is hypoth
         esized that multinucleated TRAP-positive cells when reaching the subj
         acent contaminated and damaged root surface after having removed necr
         otic PM tissue, continued to remove the cementum surface.
Språk:   eng
PublID:  r95004058
StatKat: f

5
PublKat: A11 (Artikkel i internasjonalt vitenskapelig tidsskrift med referee)
Instit:  Universitetet i Bergen, Det odontologiske fakultet, Odontologisk institutt, Kjeveortopedi
Forf:    Linder-Aronsen, A.
Medforf: Rygh, P.
Tittel:  Orthodontic magnets. Part I. Developement of an in vivo experimental m
         odel for the study of skin and bone reactions.
Tidskr:  Kieferorthopädische Mitteilungen
År:      1994
Volum:   8
Side(r): s. 21-27
Emneord: rat tibia, aluminium ring, light microscopy, experimental model
SamNor:  The present study is the first part in a series of experiments aiming
          at identifying possible biological effects of low-power orthodontic
         magnets. For this purpose the proximal tibial region of the hind leg
         of young male Wistar rats was chosen. The aim of this first article w
         as to map growth changes and reactions to a sham appliance for experi
         ments lasting up to four weeks. Mapping of histological and anatomica
         l reference levels along the area covered by the appliance showed tha
         t is was possible to distinguish between changes due to physiological
          growth and reactions to the appliance. The data will serve to aid id
         entification of comparable levels for evaluation of reactions to expe
         rimental appliances fitted with magnets.
Språk:   eng
PublID:  r95004062
StatKat: f

6
PublKat: A11 (Artikkel i internasjonalt vitenskapelig tidsskrift med referee)
Instit:  Universitetet i Bergen, Det odontologiske fakultet, Odontologisk institutt, Kjeveortopedi
Forf:    Linder-Aronson, A.
Medforf: Rygh, P.
Tittel:  Orthodontic magnets. Part II. Skin and bone reactions in the rat follo
         wing exposure to orthodontic magnets.
Tidskr:  Kieferorthopädishe Mitteilung
År:      1994
Volum:   8
Side(r): s. 29-39
Emneord: orthodontic magnets, rat tibia, tissue reactions, light microscopy
SamNor:  The present study is the second part in a series of experiments aimin
         g at identifying possible biological effects of low-power orthodontic
          magnets, more specifically to investigate morphological effects on m
         ineralized and soft tissues in contact with orthodontic magnets. The
         proximal tibial part of the left hind leg in young male Wistar rats w
         as exposed to an inhomogeneous static magnetic field from magnets fit
         ted into aluminium rings for periods from 2 to 8 weeks. Control rings
          without magnets were applied to the right leg. The material was eval
         uated morphogically and histomorphometrically. The total thickness of
          the medical and cortical components of the tibial bone was reduced a
         fter 8 weeks of exposure to the magnets. The ratio between cortical b
         one and total bone widths was reduced in the magnetic field, indicati
         ng an inhibition of the bone formation. The sebaceous glands were red
         uced in number or, in some specimens even after 4 weeks. Although, di
         stinct biological effects were observed, it remains to be determinded
          whether the magnetic field, the magnetic material itself of yet unkn
         own factors caused these effects.
Språk:   eng
PublID:  r95004070
StatKat: f

7
PublKat: A11 (Artikkel i internasjonalt vitenskapelig tidsskrift med referee)
Instit:  Universitetet i Bergen, Det odontologiske fakultet, Odontologisk institutt, Kjeveortopedi
Forf:    Tindlund, R.S.
Medforf: Rygh, P.
Tittel:  Comment on case report.
Tidskr:  American Journal of Orthodontics and Dentofacial Orthopedic
         s
År:      1994
Volum:   106
Side(r): 18A
Språk:   eng
PublID:  r95004579
StatKat: f

8
PublKat: A11 (Artikkel i internasjonalt vitenskapelig tidsskrift med referee)
Instit:  Universitetet i Bergen, Det odontologiske fakultet, Odontologisk institutt, Kjeveortopedi
Forf:    Tindlund, R.S.
Tittel:  Skeletal Response to Maxillary Protraction in Patients with Cleft Lip
         and Palate before Age 10 Years.
Tidskr:  Cleft Palate-Craniofacial Journal
År:      1994
Volum:   31
Side(r): s. 295-308
Emneord: anterior crossbite, cephalometrics, cleft lip and palate, dentofacial
          orthopedics, evalation of maxillary skelatal response, evaluation of
          skeletal maxillomandibular change, interceptive orthodontic treatmen
         t, maxillary hypoplasia, maxillary protraction, maxillary retrusion
SamNor:  Over the last 15 years, cleft lip and palate (CLP) patients with maxi
         llary deficiency in the care of the Bergen CLP Team have received int
         erceptive orthopedic treatment to correct anterior and posterior cros
         sbites during the deciduous and mixed dentition periods.  The present
          study comprises 72 subjects of various cleft types with anterior cro
         ssbite, treated to an acceptable positive overjet by maxillary protra
         ction using a facial mask (Delaire). Lateral cephalograms were taken
         immediately before and after the active treatment periods. Individual
         s exhibiting a favorable (fair) skeletal response to the protraction
         were compared with those who revealed little, (poor) skeletal respons
         e. Two cephalometric variables were chosen for the evaluation of the
         sagittal skeletal treatment changes: (1) the sagittal maxillomandibul
         ar change (change of angle ss-n-sm (ANB)); and (2) the forward moveme
         nt of the nasion-sella-line (NSL) through sella.  A numerical change
         greater than or equal to the
Språk:   eng
PublID:  r95003950
StatKat: f


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