Use of 3D stereophotogrammetry for volumetric analyses and image superimposition of dental arches before and after surgery of individuals with unilateral and bilateral cleft lip and palate

Author(s)

Eloá Cristina Passucci Ambrosio

• Document type: Doctoral Thesis
• Press: Bauru.
• Institution: Universidade de São Paulo (USP). Faculdade de Odontologia de Bauru (FOB/SDB)
• Defense date: 2021-05-28

Examining board members

Thais Marchini de Oliveira Valarelli; Nivaldo Alonso; Maria Beatriz Duarte Gavião; Maria Aparecida de Andrade Moreira Machado

• Advisor: Thais Marchini de Oliveira Valarelli

Abstract

This thesis aimed to present four scientific articles. Article 1: to use new threedimensional (3D) anthropometric analyses to verify the postsurgical effects on the maxillary segments of children with unilateral cleft lip and palate. The sample was composed by 150 digitized dental models with unilateral complete cleft lip (UCL) and unilateral cleft lip and palate (UCLP). The impressions were taken before cheiloplasty (T1), after cheiloplasty (T2), and after palatoplasty (T3). Linear measures (IC; IC; IT; IT) were analysed. The intergroup analysis showed that the measures IC and IT demonstrated a reduction of the dental arches growth of UCLP group. The new 3D anthropometric analysis showed that the development of the maxillary segments changed after cheiloplasty. Article 2: to evaluate the volumetric, linear, palatal surface area, and the dental arch superimposition of participants with bilateral complete cleft lip (BCL) and bilateral cleft lip and palate (BCLP) surgically treated. The sample was composed by 136 digitized dental models evaluated before cheiloplasty (T1), after cheiloplasty (T2), and after palatoplasty (T3). Volume, superimposition, area and linear (IC; IC; CC; IT; IT; TT) measurements were evaluated. The intergroup analysis revealed that CC, TT, IC, and IC were significantly smaller in BCLP group, whereas the volume, superimposition, and area were statistically similar between participants. The comparison between bilateral orofacial clefts showed reduction in the transversal and anteroposterior linear measurements, but not in the area, volume and superimposition. Article 3: to analyse whether the novel method of 3D3D superimposition can quantify the specific characteristics of the dental arches before and after cheiloplasty in children with cleft lip and palate. The stereophotogrammetry system software analysed the 3D3D superimpositions in two groups of matches (same participant) and one group of mismatches (different participant). The differences were evaluated by Root Mean Square (RMS). RMS was significantly greater in mismatches than in matches groups. 3D3D superimposition can quantify the individual characteristics of the dental arches of children with unilateral cleft lip and palate submitted to cheiloplasty. Article 4: to evaluate the effects of treatment protocols on the dental arches of children with cleft lip and palate treated with or without pre and postsurgical orthopedics (PSO). The sample comprised 96 digitized dental models divided into: Group 1 (G1) children treated by Hotz plate; Group 2 (G2) children treated with nasoalveolar molding (NAM); and Group 3 (G3) children treated without PSO. The evaluated treatment times were: T1 presurgical time and T2 postoperative time. The following measurements were obtained: intercanine, intertuberosity, anterior and total intrasegment, anterior and total intersegment; cleft (C Area) and segments area (S Area); and angular measurements: anterior greater segment (GCT); posterior greater segment; and posterior smaller segment with the use of software. Intergroup analysis showed that G3 had a smaller percentage growth for S Area, C Area, and GCT than children treated with PSO. Pre and postsurgical orthopedics reduced the residual effects produced by the healing tension of the lip on the dental arch. (AU)

• FAPESP's process: 17/02706-9 - Use of 3D stereophotogrammetry for volumetric analyses and image superposition of dental arches before and after surgery of individuals with unilateral and bilateral cleft lip and palate
• Grantee: Eloá Cristina Passucci Ambrosio
• Support Opportunities: Scholarships in Brazil - Doctorate