Biomedical subjects

Manuel O Lagravère

Publications and source records attributed to Manuel O Lagravère.

8 recordsLinked to original sources

PubMed2006

Plane orientation for standardization in 3-dimensional cephalometric analysis with computerized tomography imaging.

INTRODUCTION: The purpose of this study was to propose certain landmarks and planes to standardize 3-dimensional image orientation. METHODS: Cone-beam computerized tomographic images were obtained from 10 adolescent patients and analyzed with AMIRA software (AMIRA, Mercury Computer Systems, Berlin, Germany). RESULTS: Four points (ELSA, right superior external auditory meatus, left superior external auditory meatus, and mid-dorsum foramen magnum) were located on each image. The axial-horizontal plane (x-y plane) was then determined by using both superior external auditory meatus and ELSA; the sagittal-vertical plane (z-y plane) was formed by ELSA and mid-dorsum foramen magnum perpendicular to the x-y plane. CONCLUSIONS: All points had high intrareliability and were adequate for standardizing the orientation of 3-dimensional images.

Adolescent↗

PubMed2006

Meta-analysis of immediate changes with rapid maxillary expansion treatment.

BACKGROUND: The authors conducted a literature review to evaluate immediate transverse, anteroposterior, and vertical dental and skeletal changes produced by rapid maxillary expansion (RME). TYPES OF STUDIES REVIEWED: The authors reviewed clinical trials that assessed immediate dental and/or skeletal changes after RME using cephalometric analysis, model casts or both. No surgical or other simultaneous treatment was accepted during the evaluation period. RESULTS: The authors searched electronic databases and found 31 articles that met the initial inclusion criteria. The authors later rejected 12 of these articles because they did not report immediate changes, three because they lacked detailed descriptions of their results and two because of their nonconventional appliance designs. Fourteen articles satisfied th final inclusion criteria; however, they had methodological deficiencies. CLINICAL IMPLICATIONS: The greatest changes resulting from RME in the studies analyzed were dental and skeletal transverse changes. Few vertical and anteroposterior immediate changes were statistically significant, though they probably are not clinically important.

Cephalometry↗

PubMed2005

Proposed reference point for 3-dimensional cephalometric analysis with cone-beam computerized tomography.

INTRODUCTION: The purpose of this article is to propose a reference landmark for use in 3-dimensional cephalometric analysis with 3-dimensional volumetric images. METHODS: Cone-beam computerized tomographies were obtained from 10 adolescent patients. They were analyzed with AMIRA software (Mercury Computer Systems, Berlin, Germany). RESULTS: The proposed reference point is located between both foramina spinosum. CONCLUSION: This point has high intrareliability and is an adequate landmark for use as a reference in 3-dimensional cephalometric analysis.

Adolescent↗

PubMed2005

The treatment effects of Invisalign orthodontic aligners: a systematic review.

BACKGROUND: The authors conducted a systematic review of the literature to determine the treatment effects of the Invisalign orthodontic system (Align Technology), Santa Clara, Calif.). TYPES OF STUDIES REVIEWED: The authors reviewed clinical trials that assessed Invisalign's treatment effects in nongrowing patients. They did not consider trials involving surgical or other simultaneous fixed or removable orthodontic treatment interventions. RESULTS: The authors searched electronic databases (PubMed, MEDLINE, MEDLINE In-Process & Other Non-Indexed Citations, Evidence Based Medicine Reviews, EMBASE Excerpta Medica, Thomsen's ISI Web of Science and LILACS) with the help of a senior health sciences librarian. They used "Invisalign" as the sole search term, and 22 documents appeared in the combined search. Thereafter, they used "clinical trials," "humans" and "Invisalign treatment effects" as abstract selection criteria. Only two published articles met these inclusion criteria, though after reading the actual articles, the authors determined that they did not adequately evaluate Invisalign treatment effects. Both articles identified methodological issues. CLINICAL IMPLICATIONS: The inadequately designed studies the authors found represented only a lower level of evidence (level II). Therefore, the authors found that no strong conclusions could be made regarding the treatment effects of Invisalign appliances. Future prospective randomized clinical trials are required to support, with sound scientific evidence, the claims about Invisalign's treatment effects. Clinicians will have to rely on their Invisalign clinical experience, the opinions of experts and the limited published evidence when using Invisalign appliances.

Activator Appliances↗

PubMed2005

Skeletal and dental changes with fixed slow maxillary expansion treatment: a systematic review.

BACKGROUND: The authors were not able to identify any systematic reviews or meta-analysis on the dental or skeletal changes associated with slow maxillary expansion (SME). Therefore, they conducted a study to evaluate skeletal and dental changes after fixed SME treatment in orthodontic patients with constricted arches. METHODS: The authors included in their evaluation clinical trials that assessed skeletal and dental arch changes through measurements on dental casts or cephalometric radiographs. The authors did not consider trials involving surgical or other simultaneous treatment interventions during the active expansion period. RESULTS: With the help of a health sciences librarian, the authors searched the following electronic databases: PubMed, MEDLINE, MEDLINE In-Process and Other Non-Indexed Citations, Evidence Based Medicine Reviews (Cochrane Database of Systematic Reviews, American College of Physicians Journal Club, Database of Abstracts of Reviews of Effects and Cochrane Central Register of Controlled Trials), EMBASE Excerpta Medica, Thomsen's ISI Web of Sciences and LILACS. Eight articles met the initial inclusion criteria. The authors found that a significant deficiency in the studies was the lack of a control group to factor out changes in the dental arch and skeletal structures associated with normal growth. CONCLUSIONS AND CLINICAL IMPLICATIONS: The authors found only a lower level of evidence. Therefore, they could make no strong conclusions on dental or skeletal changes that occurred after SME treatment. Clinicians need to rely on their clinical experience, experts' opinions and the presented limited evidence concerning SME treatments.

Age Factors↗

PubMed2005

Laypersons' perceptions of the esthetics of visible anterior occlusion.

OBJECTIVE: To analyze 6 different types of visible anterior occlusion, exclusive of extraoral facial features, in terms of their esthetic appeal, as perceived by 91 randomly selected adult laypersons with different levels of education in Lima, Peru. METHODS: Photographic images of 3 examples of each occlusion type (open bite [OB], deep bite [DB], crossbite [CB], end-to-end bite [EE], crowded bite [CwB] and ideal bite [IB]) were prepared. Evaluators used a visual analogue scale (VAS) to rate their perceptions of the esthetic appeal of each view. Analysis of variance (ANOVA) was used to test differences in mean scores among occlusion types and to test the effect of evaluator characteristics on perceived attractiveness. RESULTS: The mean score was highest for IB, followed by EE, DB, CB, CwB and OB. Oneway ANOVA with Bonferroni post hoc test showed no difference between the highestscoring occlusion types (IB and EE, p > 0.99); each of the remaining groups was significantly different from both IB and EE (p < 0.001). The scores for DB, CB, CwB and OB were progressively lower, although not significantly different from one another (p > 0.05). Univariate ANOVA to determine the effects of evaluator characteristics (age, level of education, gender and interaction between level of education and gender) showed that gender was a significant factor (p < 0.034) for all bite groups except OB. Level of education was significant only for OB (p = 0.020) and age only for EE (p = 0.011). The interaction between level of education and gender was significant for all bite types (p < 0.046). CONCLUSIONS: Lay evaluators identified ideal and EE bite occlusal relationships as esthetically most pleasing. They judged DB, CB, CwB and OB bite relationships as less esthetically pleasing but did not differentiate between these types of malocclusions.

Adolescent↗

PubMed2004

The Klippel-Feil syndrome: a case report.

Short neck and fusion of cervical vertebrae are observed in several genetic conditions and well-defined syndromes. An 8-year-old boy with a short neck, low-set posterior hairline, deafness and limited neck motion was suspected of having such a condition. Clinical and radiographic examination led to the diagnosis of Klippel-Feil syndrome.

Child↗

PubMedDate not supplied

Midline diastema and frenum morphology in the primary dentition.

PURPOSE: The purpose of this study was to determine the prevalence of different types and insertions of labial frenums as well as midline diastema in Peruvian children between 0 and 6 years of age. METHODS: A sample of 1,355 children was selected for the study. A clinical examination was done to classify the labial frenum, measure gingival insertion levels, and quantify midline diastema. Descriptive statistics and the Spearman test were used. RESULTS: The most prevalent frenums were the simple frenum (59%) and the persistent tectolabial frenum (25%). The level of gingival insertion moved apically with age. The midline diastema was wider in younger children and decreased with age. A significant inverse relationship (r=-0.27; P=.001) was found between the level of gingival insertion and the midline diastema. CONCLUSION: The most prevalent frenum was the simple frenum. A significant inverse correlation between the gingival insertion level and the midline diastema was found.

Age Factors↗