Loading...
Publication
Interferência dos terceiros molares na colocação de microimplantes na plataforma vestibular mandibular : estudo retrospetivo
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 1.37 MB | Adobe PDF |
Advisor(s)
Abstract(s)
Objetivo: O presente estudo teve como objetivo avaliar a influência dos terceiros molares mandibulares inclusos na inserção de microimplantes (MI) na plataforma vestibular mandibular (PVM), analisando a sua posição relativa face ao ponto mais distal da coroa dos segundos molares mandibulares, através de tomografia computorizada de feixe cónico (CBCT) e radiografia panorâmica (PR).
Materiais e métodos: Neste estudo retrospetivo, foi analisada uma amostra constituída por 70 pacientes (42 mulheres e 28 homens), com idade média de 21,07 (± 9,78) anos. Realizaram-se medições bilaterais em CBCT e PR, correspondentes à distância entre o ponto mais distal da coroa do terceiro molar e o ponto mais mesial do segundo molar. Para tal, traçou-se uma tangente ao ponto mais mesial do segundo molar, paralela ao longo eixo do dente (LED). Para calibração das distâncias, mediu-se ainda a dimensão mésio-distal do incisivo central superior direito em ambos os métodos (CBCT e PR). Procedeu-se à análise estatística aplicando-se o teste t de Student para amostras emparelhadas e independentes, considerando-se um nível de significância de 5% (p <0,05).
Resultados: 95% dos terceiros molares na PR encontraram-se em relação mesial, enquanto 99,3% dos terceiros molares na CBCT encontraram-se em relação mesial. Existe uma diferença estatisticamente significativa entre as medias da CBCT e da PR (p <0,001), sendo que, a magnitude da diferença é de 1,47 mm entre os valores médios da CBCT e da PR, quase duas vezes superior (90,7%). Foram encontradas diferenças estatisticamente significativas entre os valores em função do sexo dos pacientes (p = 0,014).
Conclusão: A prevalência de terceiros molares inclusos em posição de risco evidencia a necessidade da sua consideração no planeamento ortodôntico. A CBCT demonstrou superior precisão imagiológica, constituindo o método de eleição para a avaliação anatómica e prevenção de complicações.
Objectives: The present study aimed to evaluate the influence of impacted mandibular third molars on the insertion of microimplants (MI) in the mandibular buccal shelf (MBS), analyzing their relative position to the most distal point of the crown of the mandibular second molars, through cone beam computed tomography (CBCT) and panoramic radiography (PR). Material and methods: In this retrospective study, a sample of 70 patients (42 females and 28 males), with a mean age of 21.07 (± 9.78) years, was analyzed. Bilateral measurements were performed on CBCT and PR, corresponding to the distance between the most distal point of the third molar crown and the most mesial point of the second molar. For this purpose, a tangent was drawn from the most mesial point of the second molar, parallel to the long axis of the tooth (LAT). To calibrate the distances, the mesiodistal dimension of the maxillary right central incisor was also measured using both methods (CBCT and PR). Statistical analysis was performed using Student’s t-test for paired and independent samples, considering a significance level of 5% (p < 0.05). Results: 95% of third molars on PR were found in a mesial position, while 99.3% of third molars on CBCT were found in a mesial position. A statistically significant difference was observed between the means of CBCT and PR (p < 0.001), with the magnitude of the difference being 1.47 mm between the mean values of CBCT and PR, almost twice as high (90.7%). Statistically significant differences were also found between the values according to the patients’ sex (p =0.014). Conclusion: The prevalence of impacted third molars in risk positions underscores the need for their consideration in orthodontic planning. CBCT demonstrated superior imaging accuracy, establishing itself as the method of choice for anatomical assessment and complication prevention.
Objectives: The present study aimed to evaluate the influence of impacted mandibular third molars on the insertion of microimplants (MI) in the mandibular buccal shelf (MBS), analyzing their relative position to the most distal point of the crown of the mandibular second molars, through cone beam computed tomography (CBCT) and panoramic radiography (PR). Material and methods: In this retrospective study, a sample of 70 patients (42 females and 28 males), with a mean age of 21.07 (± 9.78) years, was analyzed. Bilateral measurements were performed on CBCT and PR, corresponding to the distance between the most distal point of the third molar crown and the most mesial point of the second molar. For this purpose, a tangent was drawn from the most mesial point of the second molar, parallel to the long axis of the tooth (LAT). To calibrate the distances, the mesiodistal dimension of the maxillary right central incisor was also measured using both methods (CBCT and PR). Statistical analysis was performed using Student’s t-test for paired and independent samples, considering a significance level of 5% (p < 0.05). Results: 95% of third molars on PR were found in a mesial position, while 99.3% of third molars on CBCT were found in a mesial position. A statistically significant difference was observed between the means of CBCT and PR (p < 0.001), with the magnitude of the difference being 1.47 mm between the mean values of CBCT and PR, almost twice as high (90.7%). Statistically significant differences were also found between the values according to the patients’ sex (p =0.014). Conclusion: The prevalence of impacted third molars in risk positions underscores the need for their consideration in orthodontic planning. CBCT demonstrated superior imaging accuracy, establishing itself as the method of choice for anatomical assessment and complication prevention.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Terceiros molares Plataforma vestibular mandibular Microimplantes CBCT Ortopantomografia