Biomedical subjects

L'Tanya J Bailey

Publications and source records attributed to L'Tanya J Bailey.

3 recordsLinked to original sources

PubMed2007

Three-dimensional cone-beam computed tomography for assessment of mandibular changes after orthognathic surgery.

INTRODUCTION: The purpose of this study was to assess alterations in the 3-dimensional (3D) position of the mandibular rami and condyles in patients receiving either maxillary advancement and mandibular setback or maxillary surgery only. METHODS: High-resolution cone-beam computed tomography scans were taken of 21 patients before and after orthognathic surgery. Ten patients with various malocclusions underwent maxillary surgery only, and 11 Class III patients received maxillary advancement and mandibular setback. Presurgery and postsurgery 3D models were registered on the surface of the cranial base. A new tool was used for graphical overlay and 3D display with color maps to visually assess the locations and to quantify positional changes in the posterior border of the mandibular rami and condyles between superimposed models. RESULTS: The average displacements in condylar position were small--0.77 mm (SD, 0.12 mm) and 0.70 mm (SD, 0.08 mm)--for 2-jaw and 1-jaw surgeries, respectively (not significant, P >.05). All 2-jaw surgery patients had backward rotational displacements of the mandibular rami (mean, 1.98 mm; SD, 1.03 mm), with a maximum surface distance change of > or =2 mm in 8 of 11 subjects. For the 1-jaw surgery, all subjects had small backward rotational displacements of the mandibular rami (mean, 0.78 mm; SD, 0.25 mm), with only 1 subject having a maximum surface distance change > or =2 mm. The difference in mean backward rotational displacement was statistically significant (P <.01). CONCLUSIONS: The visualization of 3D model superimposition clearly identified the location, magnitude, and direction of mandibular displacement. The 3D imaging allowed quantification of vertical, transverse, and anteroposterior ramus displacement that accompanied mandibular, but not maxillary only, surgery.

Adult↗

PubMed2002

Analysis of craniofacial development in children with hypohidrotic ectodermal dysplasia.

Ectodermal dysplasias (ED) are a heterogeneous group of inheritable disorders characterized by abnormal development of embryologic ectoderm derivatives. The purposes of this study were to: 1) create baseline cephalometric norms for male children with ED; 2) assess craniofacial growth and development in hypohidrotic ED male children with severe hypodontia, compared with non-ED children with class I dental relationships; 3) compare the craniofacial morphology of titanium dental implant-treated ED males with non-implant-treated ED males; and 4) correlate the severity of hypodontia to craniofacial dysmorphology. Cephalometric radiographs of class I individuals and implant-treated and nontreated ED groups were used to evaluate craniofacial morphology. Traditional cephalometric landmarks and measurements were used to compare groups using the generalized estimate equation analysis. Age, gender, and the number of permanent maxillary teeth present had a significant (P =.01) explanatory relationship with the craniofacial measures when comparing untreated ED children to norms. Mean craniofacial differences between ED and non-ED children still existed when the explanatory effects of these variables were controlled, indicating dysmorphology in several craniofacial structures (e.g., cranial base, mandibular length). The number of missing maxillary permanent teeth was significantly related with craniofacial dysmorphology in the ED population. Craniofacial morphology did not differ significantly between implant-treated and nontreated ED children, suggesting that treatment with intraosseous dental implants, as applied in this population, did not rescue normal craniofacial growth and development.

Adolescent↗

PubMed2002

Long-term stability of surgical class III treatment: a study of 5-year postsurgical results.

Previous studies have documented the stability of Class III surgical procedures in the first postsurgical year and during a postsurgical period > 2 years. To evaluate long-term changes, postoperative cephalometric radiographs at 1 year and > or = 5 years were digitized for 79 patients who had received either a bilateral sagittal split osteotomy for mandibular setback, a Le Fort I maxillary advancement, or a combination of the 2 procedures. From 1 year to longest follow-up, the mean changes were quite small. Eighty-five percent of the maxillary advancement group and the mandibular setback group and 80% of the bimaxillary surgery group showed less than 4 mm of postsurgical change from 1 year to > or = 5 years. Long-term, the mandibular setback alone was more stable than when combined with maxillary surgery. This is opposite of what was observed during the first postsurgical year. Bimaxillary surgery in Class III patients improved the stability of the mandibular setback short-term and the maxillary advancement in the short and long term if the maxilla was also moved down during surgery. This study also suggests that bimaxillary surgery in Class III patients is more stable than bimaxillary surgery in Class II patients. On questionnaires that evaluated patient perception, 92% of patients reported satisfaction with healing since surgery. Eighty-nine percent thought their experience was positive and were happy with the surgical results. The predominant problems were altered feelings in the face or mouth (68%) and surprise at the length of their recovery (41%).

Adult↗