Biomedical subjects

V Jovanovski

Publications and source records attributed to V Jovanovski.

12 recordsLinked to original sources

PubMed2005

Analysis of changes in gingival contour from three-dimensional co-ordinate data in subjects with drug-induced gingival overgrowth.

OBJECTIVES: This aim of this study was to develop and assess a technique that could be used to assess accurately the gingival volume changes seen in drug-induced gingival overgrowth by the analysis of data obtained from an entire gingival surface by means of three-dimensional imaging. MATERIAL AND METHODS: Stone dental models of patients before and after gingivectomy procedures were digitized with a laser scanner and then regenerated as computer models constructed from the acquired three-dimensional co-ordinate data. A comparison of superposed "before" and "after" surfaces was undertaken to assess and accurately quantify changes in gingival contour. RESULTS: The mean vertical tissue reduction varied from 1.58 to 2.56 mm in the four study subjects and individual differences are shown. The maximum thickness of removed buccal gingival overgrowth was found to range between 1.20 and 3.40 mm. The volume of tissue removed from each inter-dental papilla ranged from 4.2 to 46.1 mm3 and the mean volume of the papilla removed from each subject+/-SD values was 24.8+/-13.1 mm3. CONCLUSION: This method will measure changes in gingival tissues to within 60 microm in one plane, making it ideal for the assessment of longitudinal changes in gingival contour as seen in the development of gingival overgrowth, its recurrence after surgery or the changes in volume brought about by surgery.

Gingiva↗

PubMed2001

Tooth size and morphology in twins.

OBJECTIVE: To assess concordance of tooth size and occlusal morphology in monozygotic (identical) and dizygotic (non-identical) twins compared to unrelated controls in order to determine how much these dental traits are related to inheritance. METHODS: Mesiodistal and bucco-lingual dimensions of tooth size in 34 pairs of twins were measured with dial calipers. In addition, the occlusal morphology of nine pairs of teeth was assessed using a co-ordinate measuring machine with a non-contact laser probe. RESULTS: The results showed greater concordance in tooth size for both mesiodistal and bucco-lingual dimensions within twin pairs compared to twin and unrelated controls. Furthermore, monozygotic (MZ) twins showed greater concordance than dizygotic (DZ) twins for all permanent teeth with statistically significant variance for the mesiodistal dimension (P = 0.01) but not bucco-lingual dimension. Superimposed computer models of the digitized occlusal surfaces showed a high degree of similarity for MZ twins compared to DZ twins. The mean intrapair deviation was 147 microm for MZ, 209 microm for DZ and 258 microm for unrelated controls. CONCLUSIONS: The remarkable similarity in the tooth size and morphology of monozygotic twins suggests a strong inheritability factor to tooth size and shape and that these may be useful as additional tools for zygosity determination along with other dental traits.

Adolescent↗

PubMed2000

Analysis of the morphology of oral structures from 3-D co-ordinate data.

A non-intrusive method is described which can be used to determine the forms of oral structures. It is based on the digitising of standard replicas with a co-ordinate-measuring machine. Supporting software permits a mathematical model of the surface to be reconstructed and visualised from captured three-dimensional co-ordinates. A series of surface data sets can be superposed into a common reference frame without the use of extrinsic markers, allowing changes in the shapes of oral structures to be quantified accurately over an extended period of time. The system has found numerous applications.

Algorithms↗

PubMed1999

Quantification of root surface plaque using a new 3-D laser scanning method.

There are no published reports in the literature objectively quantifying thickness of plaque on teeth. The aim of this study was to quantify plaque on a tooth surface and assess if this quantification correlates with a clinical index of plaque from each of 51 patients. Patients were instructed not to perform any oral hygiene on the day of the assessment. The Silness and Löe plaque index was scored and replicas were scanned using a co-ordinate measuring machine (CMM) and laser scanning probe. A replica was obtained from this surface before and after toothbrushing. Plaque adjacent to the gingival margin had a mean thickness of 0.106+/-0.118 mm (mean+/-SD) whilst mean plaque thickness 250 microm from the gingival margin was 0.053+/-0.052 mm (mean+/-SD). There was a significant correlation between the plaque index and the plaque thickness (p < or = 0.002). The finding that plaque is present in the greatest amount adjacent to the gingival margin supports a previously reported hypothesis that primary root carious lesions (PRCL's) may initiate adjacent to the gingival margin. This method quantifies plaque thickness on exposed root surfaces which correlates with the plaque index as well as illustrating how the morphological characteristics of teeth, gingivae and plaque can be studied in vivo from replicas recorded.

Adult↗

PubMed1981