The Experts below are selected from a list of 204 Experts worldwide ranked by ideXlab platform

Greg C Nelson - One of the best experts on this subject based on the ideXlab platform.

  • maxillary canine Third Premolar transposition in a prehistoric population from santa cruz island california
    American Journal of Physical Anthropology, 1992
    Co-Authors: Greg C Nelson
    Abstract:

    Canine/Premolar transposition is rare in both historic and prehistoric Homo sapiens with a known occurrence of less than 0.10%. This report describes a prehistoric population sample from one site (SCrI-3) on Santa Cruz Island, California in which the rate of C/P3 transposition is greater than eight percent, based on nine of 106 adult crania which exhibit the anomaly either uni- or bilaterally. As a means of investigating the etiology of this anomaly, the location of the canine root in adult crania was studied. Root location should indicate tooth bud origin, a factor likely to be under genetic control. In crania with normally erupted canines, the superior portion of the root averages 4.43 mm from alare, while this distance is 8.96 mm for anomalous roots. This difference suggests that during ontogeny the tooth buds for the canine and Premolar arose in the wrong (or reversed) places, causing the teeth to erupt anomalously. It is suggested that inbreeding in a small island community resulted in a short-lived appearance of this anomaly at a high frequency. © 1992 Wiley-Liss, Inc.

  • Maxillary canine/Third Premolar transposition in a prehistoric population from Santa Cruz Island California
    American Journal of Physical Anthropology, 1992
    Co-Authors: Greg C Nelson
    Abstract:

    Canine/Premolar transposition is rare in both historic and prehistoric Homo sapiens with a known occurrence of less than 0.10%. This report describes a prehistoric population sample from one site (SCrI-3) on Santa Cruz Island, California in which the rate of C/P3 transposition is greater than eight percent, based on nine of 106 adult crania which exhibit the anomaly either uni- or bilaterally. As a means of investigating the etiology of this anomaly, the location of the canine root in adult crania was studied. Root location should indicate tooth bud origin, a factor likely to be under genetic control. In crania with normally erupted canines, the superior portion of the root averages 4.43 mm from alare, while this distance is 8.96 mm for anomalous roots. This difference suggests that during ontogeny the tooth buds for the canine and Premolar arose in the wrong (or reversed) places, causing the teeth to erupt anomalously. It is suggested that inbreeding in a small island community resulted in a short-lived appearance of this anomaly at a high frequency. © 1992 Wiley-Liss, Inc.

Z Halata - One of the best experts on this subject based on the ideXlab platform.

Allen E. Goodship - One of the best experts on this subject based on the ideXlab platform.

  • Immediate Functional Loading of Single‐Tooth TIO2 Grit‐Blasted Implant Restorations: A Controlled Prospective Study in a Porcine Model. Part I: Clinical Outcome
    Clinical Implant Dentistry and Related Research, 2007
    Co-Authors: Vasilios A. Bousdras, S Sindet-pedersen, James L. Cunningham, Gordon W. Blunn, Aviva Petrie, Ignace Naert, Siegfried Jaecques, Allen E. Goodship
    Abstract:

    Background: Although favorable integration occurs with immediately loaded implants, the relationship between implant outcome, levels of occlusion, and diet requires optimization. Purpose: Pertubating load on single implant restorations immediately after placement by a hard food diet will increase the strains at the bone-implant interface, increasing the risk for failure. Materials and Methods: Forty-eight implants replaced the first and Third mandibular Premolars in 12 pigs, allocated into two groups based on soft- and hard-diet feeding. Cylindrical and tapered implants replaced the first and Third Premolars, respectively. Each animal received at random four different masticatory loading conditions (group 1 [control]: implant with either a cover screw or a healing abutment, and group 2 [test]: implant with a crown either with or without occlusal contacts). Results: Thirteen implants out of 44 failed in 11 animals (one with a cover screw, one with a healing abutment, three with nonocclusal, and eight with occlusal restorations). The failure rate of restored implants (either in occlusion or not) was significantly higher in the Third Premolar sites (p = .007), although diet had no significant effect (p = .421). Conclusions: While diet had no effect on the failure pattern of immediately loaded single implants, the position and type of load under the masticatory mode were significant. Immediately loaded implants both in and out of occlusion were less successful than the controls, and this is probably attributed to detrimental strain induced on the bone-implant interface.

  • Immediate functional loading of single-tooth TIO2 grit-blasted implant restorations: A controlled prospective study in a porcine model. Part I: Clinical outcome
    CLIN IMPLANT DENT R, 2007
    Co-Authors: Allen E. Goodship
    Abstract:

    Background: Although favorable integration occurs with immediately loaded implants, the relationship between implant outcome, levels of occlusion, and diet requires optimization.Purpose: Pertubating load on single implant restorations immediately after placement by a hard food diet will increase the strains at the bone-implant interface, increasing the risk for failure.Materials and Methods: Forty-eight implants replaced the first and Third mandibular Premolars in 12 pigs, allocated into two groups based on soft- and hard-diet feeding. Cylindrical and tapered implants replaced the first and Third Premolars, respectively. Each animal received at random four different masticatory loading conditions (group 1 [control]: implant with either a cover screw or a healing abutment, and group 2 [test]: implant with a crown either with or without occlusal contacts).Results: Thirteen implants out of 44 failed in 11 animals (one with a cover screw, one with a healing abutment, three with nonocclusal, and eight with occlusal restorations). The failure rate of restored implants (either in occlusion or not) was significantly higher in the Third Premolar sites (p = .007), although diet had no significant effect (p = .421).Conclusions: While diet had no effect on the failure pattern of immediately loaded single implants, the position and type of load under the masticatory mode were significant. Immediately loaded implants both in and out of occlusion were less successful than the controls, and this is probably attributed to detrimental strain induced on the bone-implant interface.

C Schulze - One of the best experts on this subject based on the ideXlab platform.

A Spaethe - One of the best experts on this subject based on the ideXlab platform.