Study Of Mandible Research Articles

Influence of implant dimensions and position on primary and secondary stability – A prospective clinical study in mandible using resonance frequency analysis

Influence of implant dimensions and position on primary and secondary stability – A prospective clinical study in mandible using resonance frequency analysis

The study of anthropometry of human mandibles in Wardha region

Background: The knowledge of different measurements of mandible is important to the dental surgeons in maxillofacial surgeries, reconstructive surgery of mandible, and plastic surgeries of face. The study of mandible is also important for individual identity such as age, sex, race, and stature. Objective: The objective of this study was as follows: Determination of sex, identification of individual for medicolegal purpose, and craniofacial reconstruction. Materials and Methods: In the present study, 140 cadaver mandibles including 100 male and 40 female mandibles of Wardha regions were studied. I have measured the bicondylar width, bigonial diameter, and mandibular symphyseal height of the left ramus with the help of spreading caliper (Vernier). Results: The calculated range for 100% accuracy is measured by mean ± 3.5 standards deviation. Conclusion: On the basis of percentage beyond demarking point, these parameters are found to be very useful in sex determination.

El tamaño, pero no la forma, reflejaría diferencias en las mandíbulas de dos especies de murciélagos de hoja nasal (<em>Phyllostomus</em> Lacépède, 1799) (Chiroptera, Phyllostomidae)

La mandíbula es un modelo para la evolución de las estructuras morfológicas complejas debido a que presenta una integración del desarrollo de sus diferentes estructuras. A diferencia de otras partes del cráneo, que albergan estructuras con funciones diferentes (protección del cerebro y de los órganos sensoriales), la principal demanda funcional para la mandíbula se relaciona con la alimentación. Por ello, es esperable que sea la dieta su principal agente selectivo. En esta investigación se presenta un estudio basado en morfometría geométrica, de mandíbulas pertenecientes a dos especies de murciélagos de hoja nasal, Phyllostomidae: el murciélago nariz de hoja pálido (Phyllostomus discolor Wagner, 1843) (n= 29) y el murciélago nariz de hoja lanceolada [Phyllostomus hastatus (Pallas, 1767)] (n= 6), ambas especies omnívoras, con tendencia nectarívora. Las diferencias en tamaño y forma de la mandíbula fueron examinadas usando 13 hitos anatómicos situados en la cara lateral de las hemimandíbulas. Los resultados revelaron diferencias entre ambas especies para el tamaño, pero no para la forma, siendo insignificante la variación alométrica. Se concluye que una alimentación parecida para ambas especies ha hecho evolucionar hacia una forma mandibular similar, aunque el tamaño para ambas haya evolucionado de manera independientemente.

Expansion of the Alveolar Bone Crest with Ultrasonic Surgery Device: Clinical Study in Mandible

The purpose of this paper was to document the application to the split-crest mandibular procedure in two stage in order to avoid cortical resorption due to periosteal detachment in buccal cortical bone of the alveolar crest. Twenty-two healthy patients with non-contributory past medical history (14 women and 8 men, all non-smokers, mean age 59 years, range 54-65 years) were included in this study. After buccal mucoperiosteal flap was followed by a sagittal corticotomy in the coronal area of the alveolar crest and a second sagittal corticotomy, but in a lower (basal) position and two vertical corticotomies in the buccal wall, using a ultrasonic surgery device (Surgysonic, Esacrom, Imola Italy). Adequate crest expansion was achieved without compromising cortical vascularisation by utilising a combination of scalpel, thin chisels and threaded osteotomes (Bone System, Milano, Italy). Postoperative results were assessed by panoramic and periapical radiographs. Ossification of the osteotomy lines was evident and could be observed as sites with increasing radiopacity on panoramic and periapical radiographs 3 months after implants insertion. No dehiscence of the mucosa was observed. No patient suffered from hypoaesthesia. The mean horizontal bone increase in coronal area was 5±3 mm. Mandibular ridge expansion using a split-crest technique that included grafting the implant sites with a ultrasonic surgery device is a viable therapeutic alternative for implant placement in this patient population.

犬の頭部 X 線撮影規格化について : 下顎骨(ビーグル犬)の計測学的基礎的研究

犬の頭部 X 線撮影規格化について : 下顎骨(ビーグル犬)の計測学的基礎的研究