The aim of this study is to assess the precision of the complete crown technique employed for the superimposition of 3D models, specifically in the quantitative volumetric evaluation of gingival tissues. This technique was initially introduced in an in-vitro study by Dritsas et al. (2023) as a means to achieve an accurate, reproducible, and simple method for quantification of gingival recession.
This study will involve the analysis of digital models in. ply format acquired through intraoral scanning of patients scheduled for esthetic crown lengthening, with predefined inclusion and exclusion
Patients requiring esthetic crown lengthening.
Full-mouth plaque and bleeding score not exceeding 20%.
Presence of at least 2.5 mm keratinized tissue width (Pontoriero & Carnevale, 2001).
Patients showing motivation to comply with post-operative care instructions and follow-up appointments.
1. Systemic health conditions that contraindicate or affect healing of periodontal surgery.
Single group
Complete crown technique for superimposition
Diagnostic testthe complete crown technique, the crown of the tooth corresponding to the gingival margin under evaluation will be selected using the paint method and circular selection tool. The same selection process will be applied to the moving model.
Gold standard technique for superimposition
Diagnostic testthe gold standard technique, adjacent intact teeth and a portion of the palatal gingiva will be selected. Superimpositions will be executed utilizing the software's iterative closest point algorithm (ICP).
Superimposition accuracy
Models will be exported in superimposed orientations to the Geomagic software for the measurement of superimposition accuracy, specifically the root mean square of the tooth corresponding to the gingival margin where volumetric changes are of interest, using the 3D compare tool in Geomagic software.
Marginal and Volumetric changes
For assessing changes at the gingival margin level, all three models will be selected, and a crosssection will be generated at the center of the targeted tooth, followed by linear measurements. To evaluate volumetric changes, a Boolean modifier will be applied between the T0 model and the T6 model. Excess mesh vertices will then be removed using the clean model tool. Subsequently, the excised gingival margin will become readily apparent and quantifiable, allowing for the measurement of its volume through the utilization of the 3D print module within the BlenderForDental software.
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British University In Egypt
Lead sponsor
Cairo University
Sponsor institution
Cairo University
Collaborator
