ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

&NA;This study sought to characterize the anatomical dimensions of the anterior mental loop and to determine the accuracy of conventional radiographs in identifying its presence and dimensions. The study group consisted of 46 hemimandibles fixed in formalin. Radiographs of the area between the mental foramen and the midline were obtained and evaluated for each hemimandible, followed by dissection and physical examination of the same area. Anatomically, an anterior loop of the mental nerve was observed in only 13 hemimandibles (28%). The anterior extension of the loop ranged from 0.4 to 2.19 mm. No correlation was found between the radiographic image and the anatomical shape of the loop. Of the radiographically diagnosed loops, 40% were not seen in anatomical examination. In cases with a false radiologic loop, a correlation was found between the diameter of the origin of the incisive canal and the radiologic interpretation of the loop. The radiologic appearance or diagnosis of the anterior mental loop in cadaver mandibles does not disclose the true ramification of the inferior alveolar nerve to the mental and incisive nerve. (Implant Dent 2000; 9:120‐125)

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

&NA;This study evaluated, by histometric analysis, the wound healing process of bone around implants placed into extraction sockets with or without the concurrent application of a combination of plateletderived growth factor (PDGF) and insulin‐like growth factor (IGF‐1). Mandibular premolars were removed, and 32 implants were inserted in eight dogs. Before insertion, two implants received a single application of 5 &mgr;g/mL of PDGF and IGF‐1 delivered in 0.10 mL of 4% methylcellulose gel or 0.10 mL of 4% methylcellulose gel only as a control. To label regenerated bone, a 2% calcein green solution was administered by intramuscular injection at 0, 7, 15, 30, 45, 60, and 75 days after implant insertion. Three, 8, and 12 weeks after implant insertion, undecalcified sections were obtained, and the degree of bone contact with the implant surface, the bone area, and the intensity of bone labeling were measured into the limits of the threads of the implant. Greater extension of bone/implant contact (pairedttest,P <.05) was observed in test (22.4%±13.7%) than in control (17.2%±13.6%) implants at 3 weeks. One‐way ANOVA revealed a higher intensity of bone labeling (P <.05) at 3 weeks than at 12 weeks (127.8±42.59 and 56.7±26.34, gray scale values) for test implants. Within the limits of the present study, it was concluded that the combination of PDGF/IGF‐1 actively took part in the initial phase of bone repair. (Implant Dent 2000;9:126‐132)

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

&NA;Blood flow in sinus grafts and adjacent oral tissues was investigated using Laser Doppler Flowmetry (LDF). Special LDF probes were inserted into pilot drill holes before the final sizing drill to prepare recipient dental implant sites in the grafted sinus after a 6‐month maturation time. Patients in the study had previously undergone sinus grafting with irradiated mineralized cancellous allografts alone, which had been prepared by either hydration in saline or autogenous serum. LDF detected positive blood flow in all sites investigated. No significant differences were recorded between saline‐ and serumtreated grafts. However, blood flow at the superior aspect of the grafts was significantly lower than that recorded at midway and at the most inferior aspects of the sinus grafts. Sinus membrane blood flow was noted to be very low compared with bone and mucosal sites. LDF may be a useful technique in the verification of vitality in sinus grafts relative to that of adjacent oral structures. (Implant Dent 2000;9:133‐142)

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

&NA;The aim of this study was to evaluate the effects of experimental diabetes on the healing period leading to osseointegration. Wistar rats were injected with a single dose of streptozotocin (STZ); body weight and food intake were assessed every 48 hours. On days 2, 12, 26, and 42 post‐STZ, glucemia, plasma hemoglobin, and urea were determined. Twelve days post‐STZ, a titanium laminar implant was placed in the right tibia of each rat. Two groups of 20 rats each were killed on days 14 and 30 postimplanation, respectively. Results (ANOVA test) showed STZ‐treated rats to have 1) a significant decrease in body weight; 2) an increase in food intake; 3) normal hemoglobin and plasma urea values; 4) a significant increase in glucemia; and 5) a decrease in tibiae length. Microscopic evaluation 14 days postimplantation revealed the presence of woven bone, and, at 30 days, laminar bone was in contact with the implant. Our findings show that, in this model of periimplant bone repair and under the experimental conditions stated herein, STZ‐induced diabetes retards periimplant bone healing. (Implant Dent 2000;9:143‐149)

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

&NA;Inherent concerns for all implant systems exist. These concerns include complex restorative procedures, abutment rotational problems, marginal bone loss, and, in some cases, less than ideal cosmetic results. To overcome or reduce these problems, a new implant has been designed. The implant has been evaluated in this prospective study. Thirty‐three new design implants were placed in 11 patients for an average time of 27.25 months. The new implant design proved to be easier to restore, posed no abutment rotational problems, resulted in no marginal bone loss problems (positive bone maintenance), and produced exceptional favorable cosmetic results. (Implant Dent 2000;9:154‐161)

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

&NA;This report presents the mixed use of three different system implants for an implant‐supported fixed bridge in a resorbed maxilla. Two of six implants that had been placed were lost. New implants were combined with the remaining implants that had been placed by the previous dentists in 1992 and 1997. The three implant systems consisted of the following: one incorporated an intramobile element into an implant device, and the other two were whole titanium screw‐type implants (one with a machined surface and the other with a plasmasprayed surface). This clinical report describes the connection designs of these different system implants to the fixed bridge and lists the complications that followed. (Implant Dent 2000;9:162‐167)

ISSN:1056-6163    

出版商:OVID    

年代:2000

数据来源: OVID