The aim of the study is to find the shape of arch anteroinferior in normal natural occlusions and relate this finding with the Interlandi’s method of selection of the mandibular anterior arch. The sample was 9 study models of the lower arch (5 males and 4 females between 13-17 years) in normooclusion, with mild crowding, no facet of wear, without coronary fracture, no decay or restorations and without some kind of tooth abnormality in shape, size and number. It was the digitizing of models (with points of reference on cusp of canines, interincisor point and canine distal face) with a graph paper (for the calibration software Corel Draw x 5), with same conditions (brightness, contrast, extension 100) and saved in jpg format. Once calibrated the model image, aligned the cusps of the canines in the horizontal plane. First technique with the formation of the segment arch individualized for...

The objective of the present study was to determine the difference mesiodistal crown between the homologous teeth in the permanent dentition and to establish the relation of the mesiodistal size, according to the gender. For this purpose, there were 120 study models that belonged to 120 students (60 boys and 60 girls) between 12 – 18 years old of 5 Educational Institutions in Chaclacayo (Lima – Peru) according to the inclusive and exclusive criteria; the mesio-distal sizes of the teeth were measured in each model. It was used a Centesimal Vernier with 0,02 mm of precision. The collected data was analyzed with the “t” of Student for determine the significant difference. Results: There was significant the discrepancy in the mesiodistal diameter. For men in 7 homologous teeth (Maxilla: lateral incisors, canines and second bicuspids; Mandible: central incisor, lateral incisors, canin...

The aim of the study is to find the shape of arch anteroinferior in normal natural occlusions and relate this finding with the Interlandi’s method of selection of the mandibular anterior arch. The sample was 9 study models of the lower arch (5 males and 4 females between 13-17 years) in normooclusion, with mild crowding, no facet of wear, without coronary fracture, no decay or restorations and without some kind of tooth abnormality in shape, size and number. It was the digitizing of models (with points of reference on cusp of canines, interincisor point and canine distal face) with a graph paper (for the calibration software Corel Draw x 5), with same conditions (brightness, contrast, extension 100) and saved in jpg format. Once calibrated the model image, aligned the cusps of the canines in the horizontal plane. First technique with the formation of the segment arch individualized for...

The objective of the present study was to determine the difference mesiodistal crown between the homologous teeth in the permanent dentition and to establish the relation of the mesiodistal size, according to the gender. For this purpose, there were 120 study models that belonged to 120 students (60 boys and 60 girls) between 12 – 18 years old of 5 Educational Institutions in Chaclacayo (Lima – Peru) according to the inclusive and exclusive criteria; the mesio-distal sizes of the teeth were measured in each model. It was used a Centesimal Vernier with 0,02 mm of precision. The collected data was analyzed with the “t” of Student for determine the significant difference. Results: There was significant the discrepancy in the mesiodistal diameter. For men in 7 homologous teeth (Maxilla: lateral incisors, canines and second bicuspids; Mandible: central incisor, lateral incisors, canin...

Para el diagnóstico y tratamiento de las maloclusiones dentarias es preciso realizar un análisis de los dientes extrayendo una información detallada de la cara oclusal, forma, tamaño, simetría de los arcos, alineamiento dentario, giroversiones, anomalías dentarias, y la simetría homóloga entre piezas dentarias superior e inferior; ya que estas maloclusiones se debe a un aumento o disminución de tejido dentario de piezas dentarias individuales o grupales. Actualmente la incidencia en la variación de medidas va en aumento en relación al cambio multirracial (Ya que el Perú es una mezcla infinita de razas debido al intercambio cultural) y al dimorfismo sexual. El diámetro mesiodistal de los dientes es el principal causante de una buena o mala interdigitación de la oclusión como consecuencia a una maloclusión. Se realizó un estudio comparativo de los diámetros mesiodistales ...

Bonding failures of brackets and the repositioning of them occur quite often during the orthodontic treatment. Upon this situation, the professional may choose to stick the same bracket or bond a new one. The purpose of this study was to evaluate changes of the bonding strength of reconditioned brackets with direct flame, microetching and new brackets attached several times on the same tooth surface in vitro. 60 healthy human premolars extracted for orthodontic reasons were randomly assigned to 3 groups: Group I reconditioned brackets with air abrasion; Group II: reconditioned brackets with flame; Group III: new brackets. All brackets were bonded with resin No Mix (Prime Dental Manufactuing INC). Initially, new brackets were bonded to all groups to determine initial bonding strength (first shear test), then were subjected to four tests using a universal testing machine. The results showe...

The aim of the investigation was to determine the differences between maturing stages of third finger medium phalanx (MP3) of left and right hands. We postulated the hypothesis of the existence of significant differences between the MP3 maturation stages of both hands. A sample of 84 children was extracted from 8 to 15 years old patients of the Dentistry Faculty of UNMSM. First, the child was instructed to place his or her hand with the palm downward on a flat table of wood (20 x 30 cm), with the third finger straight with the long axis of standard size periapical dental x-ray film, in such a way that the middle phalanx was located in the center of the film. The cone of the dental x-ray machine was positioned in light contact with the middle phalanx perpendicular to the dental x-ray film. This procedure was made first with the left hand and then with the right hand. The results showed th...

Bonding failures of brackets and the repositioning of them occur quite often during the orthodontic treatment. Upon this situation, the professional may choose to stick the same bracket or bond a new one. The purpose of this study was to evaluate changes of the bonding strength of reconditioned brackets with direct flame, microetching and new brackets attached several times on the same tooth surface in vitro. 60 healthy human premolars extracted for orthodontic reasons were randomly assigned to 3 groups: Group I reconditioned brackets with air abrasion; Group II: reconditioned brackets with flame; Group III: new brackets. All brackets were bonded with resin No Mix (Prime Dental Manufactuing INC). Initially, new brackets were bonded to all groups to determine initial bonding strength (first shear test), then were subjected to four tests using a universal testing machine. The results showe...

The aim of the investigation was to determine the differences between maturing stages of third finger medium phalanx (MP3) of left and right hands. We postulated the hypothesis of the existence of significant differences between the MP3 maturation stages of both hands. A sample of 84 children was extracted from 8 to 15 years old patients of the Dentistry Faculty of UNMSM. First, the child was instructed to place his or her hand with the palm downward on a flat table of wood (20 x 30 cm), with the third finger straight with the long axis of standard size periapical dental x-ray film, in such a way that the middle phalanx was located in the center of the film. The cone of the dental x-ray machine was positioned in light contact with the middle phalanx perpendicular to the dental x-ray film. This procedure was made first with the left hand and then with the right hand. The results showed th...