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...

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...

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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 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...

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 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...