Indiana University-Purdue University Indianapolis (IUPUI) / Primary consideration must be given to the temporomandibular joint when planning and performing orthognathic surgical procedures. It has long been understood that the status of the temporomandibular joint can easily and unintentionally be altered during orthognathic surgery, regardless of the method of fixation used. With the advent of modern fixation techniques, many clinicians and investigators have questioned the effects of rigid fixation on the temporomandibular joint. To investigate this, a clinical study of 40 patients treated with mandibular advancement for retrognathism was performed. Twenty patients were treated with rigid fixation while another 20 patients had inferior border wires placed with anterior skeletal fixation. All patients were asked questions regarding the history of their temporomandibular joints. In addition, all patients received a clinical postoperative temporomandibular joints. In addition, all patients received a clinical postoperative temporomandibular joint evaluation. The results were statistically analyzed with the Chi-square analysis and Standard T test. It was determined that the Null Hypothesis could not be rejected for any of the symptoms evaluated in this study. The results support the belief that rigid fixation is no different when compared to wire osteosynthesis in terms of prevalence of temporomandibular joint symptoms.

Orientador: Alvimar Lima de Castro / Banca: Gilberto Aparecido Coclete / Banca: Henrique José Baldo de Toledo / Resumo: Através de recurso digital, foram realizados exames radiográficos densitométricos com a finalidade de se comparar a reparação cicatricial óssea alveolar quando da utilização, para corte, de brocas giratórias de alta e baixa rotações. No estudo, foram utilizados seis suínos da raça Large White, idade aproximada de dois meses e peso corpóreo inicial variando em torno de 20 Kg. Após os procedimentos anestésicos, dois cortes longitudinais na região alveolar mandibular esquerda foram realizados, um por meio de instrumento rotatório de alta rotação e o outro pela ação da baixa rotação, ambos com irrigação líquida. Após os períodos pós-operatórios de sete e quatorze dias, os animais foram sacrificados e suas mandíbulas retiradas para estudos radiográficos digitais indiretos, pelo sistema DIGORA. Os resultados obtidos apontaram para uma maior concentração de radiopacidade nas áreas onde se utilizaram brocas de baixa rotação, tanto no período de sete como no período de quatorze dias. Essas observações foram confirmadas pelos histogramas do DIGORA, que apontaram valores das médias dos pixels nas áreas de osteotomia, evidenciando uma maior média de pixel (maior quantidade de tons de cinza) nas osteotomias de baixa-rotação nos dois tempos pós-operatórios / Abstract: Through digital resource, densitometric radiographic study were accomplished with the purpose of comparing the repair cicatricial alveolar bony when of the use, for cut, of rotative drills of discharge and it lowers rotations. In the study, six swines of the race Large White, approximate age of two months and initial corporal weight were used varying around 20 Kg. After the anesthetic procedures, two longitudinal cuts in the mandibular alveolar left area were accomplished, one through rotating instrument of high rotation and the other for the action of the low rotation, both with liquid irrigation. After the postoperative periods of seven and fourteen days, the animals were sacrificed and your jaws retired for studies by direct digital radiography, for the DIGORA system. The obtained results appeared for a larger radiopacity concentration in the areas where drills of low rotation were used, so much in the period of seven as in the period of fourteen days. Those observations were confirmed by the DIGORA histograms, that pointed values of the averages of the pixels in the osteotomy areas, evidencing a larger pixel average (larger amount of ash tones) in the low-rotation osteotomy in the two times post-operating / Mestre

"January 2003" Errata slip inserted inside front cover. Includes bibliographical references (leaves 282-313)

"January 2003" / Errata slip inserted inside front cover. / Includes bibliographical references (leaves 282-313) / xxx, 313 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Pathology, 2003

No description available.

Aims: To evaluate and compare the wound healing process following osteotomies performed with either conventional rotary burs or piezoelectric surgery in a rabbit model mimicking access to the maxillary sinus cavity for sinus floor augmentation. Materials and methods: On the nasal bone of 16 adult New Zealand white rabbits, two types of osteotomy window defects of nasal cavities were marked to critical size with a Trephine drill (ø 5 mm) and then prepared with either a conventional rotary bur or piezo-surgery (PIEZOSURGERY® Insert OT5 of PIEZOSURGERY® 3 unit, Mectron s.p.a., Genova, Italy). The defects were covered with a resorbable membrane (Bio-Gide®, Geistlich Pharma AG, Wohusen LU, Switzerland). Four animals were sacrificed at one, two, three and five weeks after surgical procedure, respectively. Histological and morphometric evaluations were performed to assess the volumetric density of various tissue components: the blood clot (BC), vascularized structures (VS), provisional matrix (PM), osteoid, mineralized bone (MB), bone debris (BD), residual tissue, old bone (OB). Results: at the 1 week, more BC detected after piezo- surgical preparation. However, the difference did not reach statistical significance. A tendency of higher proportions of osteoid in the conventional bur defects was noted, but not statistically significant. Significantly more BD was found in the conventionally compared to the piezo-surgically prepared defects. At two weeks, new bone formation was noted, and the process of modeling of the newly formed bone had started. More MB was detected in the defect prepared by piezo-surgery than by conventional bur, but without any statistically significant difference. In the marginal areas of defect, slightly more osteoblasts (Obl) were present in piezo-surgically prepared defect than in conventional prepared defect, although there is no significant difference. At 3 week, a newly formed hard tissue bridge mainly composed of woven bone was seen. A high volumetric density of mineralized bone (MB) presented in all the specimens, At the 5 week, the defects were completely filled with newly formed bone. Conclusion: the defect prepared by piezo-surgery showed a significantly decreased proportion of bone debris at one week compared to conventional rotary bur defect. Increased volumetric densities of mineralized bone were observed in the piezo-surgical compared to the conventional bur defect after two weeks, although not statistically significant. Irrespective of the preparation modality of the defect performed, the defect was almost filled with newly formed bone at three weeks. At five weeks, complete regeneration of the calvaria defects was achieved. / published_or_final_version / Dental Surgery / Master / Master of Dental Surgery

Thesis (M.S.)--University of Michigan, 1987.

Master of Science in Biomedical Sciences / Department of Clinical Sciences / James K. Roush / Interday and intraday stance analysis variability in dogs with hindlimb lameness Objective: The purpose of this study was to assess the same day and next-day repeatability of data collected with a Pet Safe Stance Analyzer on animals with naturally-occurring lameness presented for veterinary orthopedic examination. Our hypothesis was that dogs would show consistent repeatability with regards to body weight distribution on the Pet Safe Stance analyzer. Materials and Methods: Interday Variability Trial: Thirty-one consecutive dogs presenting for hindlimb lameness were included. The PetSafe Stance Analyzer was used with the dog standing in their natural standing position with each foot placed in its respective quadrant on the Stance Analyzer. A minimum of 5 valid measurements were collected and averaged to find the mean distribution of weight on each limb. This process was repeated the following day with the same handler and recorder. Intraday Variability Trial: Fifteen consecutive dogs were placed on the Pet Safe Stance analyzer and measurements were collected for each of 5 trials identical to the interday group. Four additional assessment trials followed with reintroduction of the animal to the room at each assessment. Results: Interday Variability Trial: There were no significant differences between Day 1 and Day 2 measured variables except for a significant increase in the Forelimb Symmetry index on Day 2 compared to Day 1. Lin’s Correlation Coefficients % body weight measured on Day 1 compared to Day 2 were significantly correlated on the lame hindlimb (0.524) and contralateral hindlimb (0.733). Intraday Variability Trial: There were no significant differences across trials for measured variables of % weight on the lame hindlimb, contralateral hindlimb, ipsilateral forelimb, or contralateral forelimb. Lin’s Correlation coefficients showed strong correlation between trials for the lame hindlimb (0.682), contralateral hindlimb (0.817), body weight (0.863), and hindlimb symmetry index (0.726). Clinical Significance: A commercial stance analyzer is a repeatable method of measurement of weight-bearing on lame hindlimbs of dogs between days and in repeated trials over one day. Day-to-day forelimb weight-bearing in dogs who are lame on a hindlimb is more variable, likely because of trial to trial changes in weight redistribution from lameness. Comparison of the effect of dog, surgeon, and TPLO surgical procedure variables on improvement of eight-week post-operative static weight-bearing Objective: To compare the effect of surgeon and tibial plateau leveling osteotomy (TPLO) procedure variations on the outcome of TPLO in naturally-occurring cranial cruciate-deficient stifles. Materials and methods: Records from 142 dogs receiving a TPLO were reviewed for information regarding surgical procedure, status of meniscus at the time of surgery, surgeon identity, ACVS diplomate or resident, meniscal release, progression of healing at the progress evaluation based on radiographic interpretation, and complications encountered. The primary outcome measure was static force on the operated limb at recheck on a PetSafe Stance Analyzer ͣ. Results: Recheck tibial plateau angle (TPA) was negatively and significantly correlated with improvement (r=-0.2132, p=0.013). Post-operative, and Recheck TPA’s were all significantly correlated with one another. The amount of TPA change from initial to immediate post-operative values was significantly correlated with the Initial TPA (r=0.628, p<0.001). Surgeon, surgical experience, arthrotomy, meniscal damage, meniscal intervention, complications, post-operative TPA, and initial TPA had no significant effect on weight-bearing at recheck. Clinical Significance: TPLO’s show improvement of 4.58% BW on the operated limb at 6-12 week rechecks on a stance analyzer. Surgeon, surgical experience, arthrotomy, meniscal damage, meniscal intervention, complications, post-operative TPA, and initial TPA have no effect on surgical outcome.

Made available in DSpace on 2015-12-10T14:22:58Z (GMT). No. of bitstreams: 0 Previous issue date: 1994-06-23. Added 1 bitstream(s) on 2015-12-10T14:29:11Z : No. of bitstreams: 1 000026917.pdf: 1451891 bytes, checksum: 678a08f5d39f4a98f275febb24c0251e (MD5) / o presente trabalho o autor realizou um estudo da estabilidade da cirurgia do tipo sagital da mandíbula com vista a correção de deformidades faciais. Doze pacientes foram selecionados da clínica de um mesmo cirurgião, sendo seis portadores de Prognatismo Mandibular (classe III de Angle) e sendo seis portadores de retrognatismo mandibular (classe II de Angle). Os pacientes foram analisados comparativamente através das medidas angulares e lineares obtidas em radiografias cefalométricas, no pré-operatório, pós-operatório imediato e pós-operatório de um ano chegando-se as seguintes conclusões: 1 As cirurgias realizadas pela técnica Dal Pont modificada por Epker ( 1977) para correção de prognatismo e retrognatismo mandibular são estáveis, e podem e devem ser indicadas no tratamento das referidas deformidades. 2 Pequenas recidivas previstas são normalmente corrigidas pela ortodontia pós-operatória. 3 Uma pequena supra correção é aconselhável em casos de grandes avanços ou retrusões. 4 Naqueles pacientes onde o movimento da retrusão mandibular é muito grande é aconselhável se usar concomitantemente à técnica sagital de mandíbula, um avanço de maxila. Nestes casos pode-se ainda indicar a fixação rígida / This research evaluated the surgical stabilily in patients with mandibular prognathism and retrognathism in which was used sagital split technic to correct those detormities. Twelve patients were selected from the clinic of only one experienced surgeon. Six patients presenter a Class III 6 a Class II molar relationship. A comparative cefalometric analysis using linear and angular measurements was performed of pre-surgery, imediate pós-surgery and 1 year follow-up. The following conclusions were obtained. 1 The Dal Pont sagital split technic modified by Epker to correct mandibular prognathisn and retroghnatism is a stable technic and must be indicated to correct those deformities. 2 Small relapses are easily corrected by the post-surgical orthodontic treatment. 3 A small over correction is advised in cases of large mandibular advancements or set bascks. 4 In those cases which a large amount of mandibular retrusion on advancement need to be performed, a combination of maxillary and mandibular surgery should be used. Rigid fixation technic is also indicated in those cases

Made available in DSpace on 2014-06-11T19:25:20Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-12-10Bitstream added on 2014-06-13T18:06:58Z : No. of bitstreams: 1 aguiar_rcms_me_araca.pdf: 4852082 bytes, checksum: 17c1153617ca654e69dd2e86e7bb5da6 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Através de recurso digital, foram realizados exames radiográficos densitométricos com a finalidade de se comparar a reparação cicatricial óssea alveolar quando da utilização, para corte, de brocas giratórias de alta e baixa rotações. No estudo, foram utilizados seis suínos da raça Large White, idade aproximada de dois meses e peso corpóreo inicial variando em torno de 20 Kg. Após os procedimentos anestésicos, dois cortes longitudinais na região alveolar mandibular esquerda foram realizados, um por meio de instrumento rotatório de alta rotação e o outro pela ação da baixa rotação, ambos com irrigação líquida. Após os períodos pós-operatórios de sete e quatorze dias, os animais foram sacrificados e suas mandíbulas retiradas para estudos radiográficos digitais indiretos, pelo sistema DIGORA. Os resultados obtidos apontaram para uma maior concentração de radiopacidade nas áreas onde se utilizaram brocas de baixa rotação, tanto no período de sete como no período de quatorze dias. Essas observações foram confirmadas pelos histogramas do DIGORA, que apontaram valores das médias dos pixels nas áreas de osteotomia, evidenciando uma maior média de pixel (maior quantidade de tons de cinza) nas osteotomias de baixa-rotação nos dois tempos pós-operatórios / Through digital resource, densitometric radiographic study were accomplished with the purpose of comparing the repair cicatricial alveolar bony when of the use, for cut, of rotative drills of discharge and it lowers rotations. In the study, six swines of the race Large White, approximate age of two months and initial corporal weight were used varying around 20 Kg. After the anesthetic procedures, two longitudinal cuts in the mandibular alveolar left area were accomplished, one through rotating instrument of high rotation and the other for the action of the low rotation, both with liquid irrigation. After the postoperative periods of seven and fourteen days, the animals were sacrificed and your jaws retired for studies by direct digital radiography, for the DIGORA system. The obtained results appeared for a larger radiopacity concentration in the areas where drills of low rotation were used, so much in the period of seven as in the period of fourteen days. Those observations were confirmed by the DIGORA histograms, that pointed values of the averages of the pixels in the osteotomy areas, evidencing a larger pixel average (larger amount of ash tones) in the low-rotation osteotomy in the two times post-operating