SwePub - search: WFRF:(Espelid Ivar Professor)

Enumeration	Reference	Cover	Find
1.	Barzangi, Jir, 1978- (author) Infant Dental Enucleation in Sweden : Perspectives on a Practice among Residents of Eastern African Origin 2017 Doctoral thesis (other academic/artistic)abstract Infant dental enucleation (IDE) is a practice consisting of the removal of deciduous canine tooth buds in infants. Practiced mainly in Eastern Africa, the purpose is to treat or to prevent bodily symptoms and diseases. IDE can cause both general and oral complications. The occurrence of IDE among Eastern African immigrants in a few European countries has been reported. However, knowledge surrounding the practice in Sweden was poor. The overall aim of this work was to explore IDE in the Swedish context. Four studies were conducted. Paper I presents a review of scientific publications. An overview of IDE was gained, and some knowledge gaps were identified. Paper II describes a cross-sectional study to determine the prevalence of IDE in small children. Dental records of 1133 children (mean age 4.6 years, SD 1.4) from a multi-ethnic area were studied. Missing deciduous canines without any registered reason were documented. One or more deciduous canines were missing in 21% of the children with known Eastern African origin (n=101), compared to only three children in the rest of the population (n=1032). Six adults of Somali origin were interviewed to explore their experiences and perceptions of IDE (paper III). These experiences and perceptions were categorised in four essentially different ways: an effective and necessary treatment, a disputed tradition, an option to failure and a desperate measure. Their experiences and perceptions were found to be highly influenced by contexts. In the final study (paper IV), the knowledge, experiences and attitudes among dental and health care personnel were examined. Questionnaires were sent to licensed personnel working in emergency departments, midwifery and child health centres, school health services and public dental health services in ten municipalities. Less than 20% had any knowledge of IDE, while 12.5% of the respondents encountering children had seen at least one patient subjected to IDE. Different attitudes were reported between clinical settings regarding responsibilities and possibilities concerning the management and prevention of IDE. From the findings presented in this thesis, it was concluded that there is a need for initiatives to increase awareness of and knowledge on IDE among dental and health care professionals. Legally obligated responsibilities in these professions regarding IDE need to be clarified, and initiatives should include guidelines regarding both the management of IDE and its prevention in Sweden. Educational programmes should also be produced for residents of Eastern African origin to change their perceptions of IDE, and a culturally sensitive approach should be adopted to ensure that such programmes are effective.
2.	Johansson, Elisabeth, 1969- (author) Effect of ozone on dental caries and on cariogenic microorganisms 2012 Doctoral thesis (other academic/artistic)abstract There are a number of unanswered questions regarding new caries preventive methods such as ozone treatment as well as novel caries detection methods that monitor and evaluate these preventive methods. This thesis seeks answers to some of these questions.Aims: Paper I investigates the in vitro sealing capacity of a novel ozone delivery system and its re-suction capacity. Paper II studies the in vitro antibacterial effect of ozone on cariogenic bacterial species with and without the presence of saliva and its possible effect on the saliva proteins. Paper III assesses the in vitro validity of laser-induced fluorescence (LF) measurements, visual inspection (colour), and tactile examination (surface texture) on root caries lesions and correlates these with histopathological measurements of lesion depths. In addition, Paper III investigates how inter-device, inter-examiner, and intra-examiner levels influence LF reading agreements and whether lesion colour and surface texture influences LF readings. Paper IV evaluates the in vivo effect of ozone and fluoride varnish treatments on occlusal caries in primary molars.Material and methods: Paper I: Full ozone application cycles, including the re-suction period, and interrupted cycles with displacement of the cup during the delivery cycle were studied using an ozone air analyser. Paper II: Ozone gas was exposed to the bacteria in the solution’s buffer and saliva via a tube connected to the ozone generator for 10, 30, and 60 seconds. Paper III: Calibrated examiners assessed lesion colour and surface texture and performed measurements with two LF devices for three separate one-week intervals. Sections (300µm thick) of 64 out of 93 teeth were obtained and examined under a microscope. Lesion depth was assessed with two references: from the delineated borderline of the original exposed root surface (ref I) or, if loss of surface continuity, the absolute lesion depth (ref II). Paper IV: The split mouth study was conducted in two parts. The participants in part A were children (mean age 4.8 years) with medium-high caries risk. Inclusion criteria were bilateral matched pairs of cavitated or non-cavitated occlusal lesions in primary molars (Ekstrand index score ≤ 3). Children in part B (mean age 4.5 years) with low-medium caries risk had pairs of non-cavitated lesions only (Ekstrand index score ≤ 2a). The assessments and treatments with ozone and fluoride varnish were performed at baseline and at three, six, and nine months. At the 12-month follow-up, only assessments were performed.Results: Paper I: Ozone leakage levels varied between 5.2 and 9.8 µg/m3. Paper II: In the salt buffer, 92%, 73%, and 64% of the initial numbers of A. naeslundii, S. mutans, and L. casei, respectively, were killed after 10 s ozone exposure and approximately 99.9% of the bacteria were dead after a 60 s exposure. After 10 and 30 s but not after 60 s exposure to ozone, S. mutans and L. casei were less efficiently killed in saliva compared to in the salt buffer. Various saliva proteins were degraded by ozone after the 60 s exposure. Paper III: The correlation between LF readings and histological depth was low with values ranging from 0.22 (p ˃ 0.05) to 0.31 (p < 0.05). The LF devices were significantly correlated with discolouration and with a surface texture denoted as hard. A significant correlation was found between colour and histological depth. No significant correlation was found between surface texture and histological depth. The reliability, evaluated as intra-class correlation coefficient, was 0.99 for intra-examiner, 0.97 for inter-examiner, and 0.98 inter-device level. Large differences were found between two consecutive measurements and high measurement errors indicated considerable deviation of individual measurements.Paper IV: In the first 15 pairs of part A, eight lesions treated with ozone and nine treated with fluoride, including all cavitated lesions, progressed to failure, i.e., required operative treatment during the study time. Due to non-acceptable results, the sample collection was discontinued because of ethical reasons. In part B, of 35 pairs, one of the ozone treated lesions failed at 12 months. A small shift towards increased VI scores was recorded for both ozone and fluoride lesions in this second part.Conclusions:- The ozone delivery system can be considered a safe system with low leakage levels in air, also with accidental displacements.- The cariogenic species S. mutans, L. casei, and A. naeslundii were sensitive to ozone gas treatment. The presence of saliva hampered the antibacterial effect of ozone.A low correlation between the LF readings and the histopathological depth of root caries lesions was shown. The LF device was found not to be appropriate for application to root caries diagnosis.- Neither ozone nor fluoride varnish treatments arrested the progression of cavitated occlusal caries lesions. In low and medium caries risk children non-cavitated occlusal lesions remained mainly unchanged during the study period. No difference in the effect of ozone and fluoride varnish treatments on occlusal caries in primary molars was seen.

Johansson, Elisabeth, 1969- (author)
Effect of ozone on dental caries and on cariogenic microorganisms
2012
Doctoral thesis (other academic/artistic)abstract
- There are a number of unanswered questions regarding new caries preventive methods such as ozone treatment as well as novel caries detection methods that monitor and evaluate these preventive methods. This thesis seeks answers to some of these questions.Aims: Paper I investigates the in vitro sealing capacity of a novel ozone delivery system and its re-suction capacity. Paper II studies the in vitro antibacterial effect of ozone on cariogenic bacterial species with and without the presence of saliva and its possible effect on the saliva proteins. Paper III assesses the in vitro validity of laser-induced fluorescence (LF) measurements, visual inspection (colour), and tactile examination (surface texture) on root caries lesions and correlates these with histopathological measurements of lesion depths. In addition, Paper III investigates how inter-device, inter-examiner, and intra-examiner levels influence LF reading agreements and whether lesion colour and surface texture influences LF readings. Paper IV evaluates the in vivo effect of ozone and fluoride varnish treatments on occlusal caries in primary molars.Material and methods: Paper I: Full ozone application cycles, including the re-suction period, and interrupted cycles with displacement of the cup during the delivery cycle were studied using an ozone air analyser. Paper II: Ozone gas was exposed to the bacteria in the solution’s buffer and saliva via a tube connected to the ozone generator for 10, 30, and 60 seconds. Paper III: Calibrated examiners assessed lesion colour and surface texture and performed measurements with two LF devices for three separate one-week intervals. Sections (300µm thick) of 64 out of 93 teeth were obtained and examined under a microscope. Lesion depth was assessed with two references: from the delineated borderline of the original exposed root surface (ref I) or, if loss of surface continuity, the absolute lesion depth (ref II). Paper IV: The split mouth study was conducted in two parts. The participants in part A were children (mean age 4.8 years) with medium-high caries risk. Inclusion criteria were bilateral matched pairs of cavitated or non-cavitated occlusal lesions in primary molars (Ekstrand index score ≤ 3). Children in part B (mean age 4.5 years) with low-medium caries risk had pairs of non-cavitated lesions only (Ekstrand index score ≤ 2a). The assessments and treatments with ozone and fluoride varnish were performed at baseline and at three, six, and nine months. At the 12-month follow-up, only assessments were performed.Results: Paper I: Ozone leakage levels varied between 5.2 and 9.8 µg/m3. Paper II: In the salt buffer, 92%, 73%, and 64% of the initial numbers of A. naeslundii, S. mutans, and L. casei, respectively, were killed after 10 s ozone exposure and approximately 99.9% of the bacteria were dead after a 60 s exposure. After 10 and 30 s but not after 60 s exposure to ozone, S. mutans and L. casei were less efficiently killed in saliva compared to in the salt buffer. Various saliva proteins were degraded by ozone after the 60 s exposure. Paper III: The correlation between LF readings and histological depth was low with values ranging from 0.22 (p ˃ 0.05) to 0.31 (p < 0.05). The LF devices were significantly correlated with discolouration and with a surface texture denoted as hard. A significant correlation was found between colour and histological depth. No significant correlation was found between surface texture and histological depth. The reliability, evaluated as intra-class correlation coefficient, was 0.99 for intra-examiner, 0.97 for inter-examiner, and 0.98 inter-device level. Large differences were found between two consecutive measurements and high measurement errors indicated considerable deviation of individual measurements.Paper IV: In the first 15 pairs of part A, eight lesions treated with ozone and nine treated with fluoride, including all cavitated lesions, progressed to failure, i.e., required operative treatment during the study time. Due to non-acceptable results, the sample collection was discontinued because of ethical reasons. In part B, of 35 pairs, one of the ozone treated lesions failed at 12 months. A small shift towards increased VI scores was recorded for both ozone and fluoride lesions in this second part.Conclusions:- The ozone delivery system can be considered a safe system with low leakage levels in air, also with accidental displacements.- The cariogenic species S. mutans, L. casei, and A. naeslundii were sensitive to ozone gas treatment. The presence of saliva hampered the antibacterial effect of ozone.A low correlation between the LF readings and the histopathological depth of root caries lesions was shown. The LF device was found not to be appropriate for application to root caries diagnosis.- Neither ozone nor fluoride varnish treatments arrested the progression of cavitated occlusal caries lesions. In low and medium caries risk children non-cavitated occlusal lesions remained mainly unchanged during the study period. No difference in the effect of ozone and fluoride varnish treatments on occlusal caries in primary molars was seen.

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