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- Lindskog Stokland, Birgitta, 1959, et al.
(författare)
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Changes in molar position with missing opposed and/or adjacent tooth: a 12-year study in women
- 2012
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Ingår i: Journal of Oral Rehabilitation. - 0305-182X. ; 39:2, s. 136-43
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Tidskriftsartikel (refereegranskat)abstract
- Summary The aim of this study was to radiographically analyse long-term changes in (i) overeruption of unopposed molars and (ii) tipping of molars with a mesial edentulous space, and whether there is an interaction between the two events. A further aim was to analyse if loss of alveolar bone height might influence overeruption and tipping. The sample consisted of panoramic radiographs taken at an interval of 12years of 292 subjects from a prospective population study of women. The panoramic radiographs were scanned and analysed. Changes in tipping, overeruption and alveolar bone height of molars and control teeth were measured. The results showed that unopposed molars were more commonly found in the upper jaw and that unopposed molars showed 4·9 times higher risk of overeruption of ≥2mm (95% CI 1·5-15·3) than opposed molars during the 12-year observation period. The average overeruption for the unopposed molars was 4·5% (s.d. 7·6), which corresponds to approximately 0·9mm. The degree of overeruption increased with decreased bone support. Molars with a mesial edentulous space were most prevalent in the lower jaw, but neither an edentulous space nor alveolar bone level/bone level change were found to have a significant effect on tipping of the molars. The average mesial tipping was 0·8° (s.d. 5·6). In conclusion, unopposed molars showed a significantly increased risk for overeruption. Molars facing a mesial edentulous space showed a low risk for mesial tipping, but a significant interaction between overeruption and tipping was identified.
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| 2. |
- Lindskog Stokland, Birgitta, 1959, et al.
(författare)
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Molar position associated with a missing opposed and/or adjacent tooth: a follow up study in women
- 2013
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Ingår i: Swedish Dental Journal. - 0347-9994. ; 37:2, s. 97-105
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of the study was to assess (i) the degree of overeruption of molars lacking opposed teeth and (ii) the inclination of molars with a mesial edentulous space and also to study (iii) changes during a 12 year period. The subject sample originated from the prospective population study of women in Gothenburg, Sweden where scanned panoramic radiographs taken with an interval of 12 years were analysed. Tipping as well as overeruption were scored on the two images according to a five-level scale. Sixty-seven subjects fulfilled the inclusion criteria at baseline and were referred to as "the non-extraction group". Further 35 subjects had lost the opposed and/or the adjacent tooth/teeth during the 12-year follow-up period: "the extraction-group". These groups were studied separately and a comparison between these groups was performed. The prevalence of molars tipped more than 15 degrees at baseline was 17.1 % in the upper jaw and 44.3 % in the lower jaw, in the non-extraction group. At baseline overeruption was seen in 25 % of the unopposed upper molars and none of lower molars in the non-extraction group. The prevalence of tipping and overeruption was statistical significant less in the extraction group (P<0.01), than in the non-extraction group at baseline, but at follow-up no statistical significant group differences existed. -The prevalence of tipped molars facing a mesial edentulous space and overerupted unopposed molars increased in adults during the 12-year period but the changes were small. -Overeruption and tipping is most pronounced immediately after extractions.
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| 3. |
- Lindskog Stokland, Birgitta, 1959
(författare)
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On tooth movements and associated tissue alterations related to edentulous areas and bone defects
- 2011
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The aim of the thesis was to study orthodontic tooth movement in relation to edentulous areas and infrabony pockets as well as the physiological movement of teeth facing an edentulous area. A dog model was used in Studies I and II. Teeth were orthodontically moved into and out from inflamed, infrabony periodontal pockets (Study I) and into areas of reduced bone height (Study II). Clinical, radiographic and histometric analyses were made with respect to changes in tooth-supporting tissues. Study III involved clinical, radiographic and 3D model assessments of changes in periodontal conditions and alveolar ridge dimensions in adult patients subjected to tooth movement into areas with reduced ridge dimensions. In Study IV, panoramic radiographs of 292 subjects, taken at an interval of 12 years, were analyzed with regard to changes in the elongation of unopposed molars and tipping of molars facing a mesial edentulous space. In the animal study orthodontic bodily movement of teeth with inflamed, infrabony pockets caused an enhanced rate of progression of the periodontal lesion (Study I), particularly when the tooth movement was directed towards the infrabony defect. Teeth with healthy periodontium that were orthodontically moved into areas of markedly reduced bone height maintained their periodontal tissue support (Study II). Corresponding orthodontic tooth movement in humans (Study III) resulted in minor dimensional alterations of the periodontal tissues and an increased bucco-lingual width of the alveolar ridge in the area into which the tooth had been moved, whereas a decreased width of the newly established edentulous area was noted. All teeth that were moved showed lateral root resorption at the level of the bone crest on the pressure side, but signs of repair were noticed 1-year post-treatment. In the 12-year radiographic study (Study IV) unopposed molars showed a significant increase in elongation over the 12 years of follow-up. The degree of elongation increased with decreased bone support. Neither edentulous space nor alveolar bone level were found to have a significant effect on tipping. In the presence of both conditions, unopposed molars and molars facing a mesial edentulous space, an increase in elongation was associated with tipping.
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| 4. |
- Lindskog Stokland, Birgitta, 1959, et al.
(författare)
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Orthodontic tooth movement into edentulous ridge areas--a case series.
- 2013
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Ingår i: European journal of orthodontics. - : Oxford University Press (OUP). - 1460-2210 .- 0141-5387. ; 35:3, s. 277-285
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this case series was to analyse dimensional alterations of the alveolar ridge and tooth-supporting structures, as well as root resorption, following orthodontic tooth movement into edentulous areas with reduced ridge dimensions. The study involved six subjects (30-70 years) with 10 edentulous jaw areas in the premolar regions. Clinical and radiographic examinations and 3D measurements on scanned study casts were performed at baseline, at retention, and after 1 year of (i) the edentulous area into which the tooth was moved and (ii) the established edentulous area from which the tooth was moved. The orthodontic tooth movement into an edentulous area resulted in most individuals in only minor dimensional alterations of the periodontal tissues. With regard to the width of the alveolar process, the results indicated a decreased width in the newly established edentulous area, whereas in the area into which the tooth had been moved, the width increased. In all cases, the moved tooth showed lateral root resorption on its pressure side at the level of the bone crest at time of retention, but signs of repair were noticed at the 1-year follow-up. Within the limitations of the study, it can be concluded that orthodontic tooth movement results in dimensional alterations of the edentulous ridge and that lateral root resorption is an inevitable side-effect.
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