Background Patients with obstructive sleep apnea (OSA) have an increased risk of perioperative co... more Background Patients with obstructive sleep apnea (OSA) have an increased risk of perioperative complications. Aim The purpose of this study is to assess whether OSA increases the risk of cardiorespiratory complications in patients undergoing endoscopic procedures. Methods A retrospective study was performed. We identified all patients who had undergone both an endoscopic procedure under conscious sedation and a sleep study from January 2001 to May 2008. Patients were divided into four groups: OSA negative (apnea–hypopnea index (AHI) 30/h. Minor and major complications were identified. The minor ones were hypertension, hypotension, bradycardia, tachycardia, oxygen desaturation ( Results Procedures were performed in 639 patients: colonoscopies 68.5%, upper endoscopies 20.2%, and combined procedures 11.3%. The mean age was 60.5 years, mean body mass index 33.7, and 93% were males. Sleep study results: 130 negative, 509 positive; 135 mild, 125 moderate, and 249 severe. Of the patients, 19% had minor complications, while 7% had major complications. There was no significant difference between the patients with and without OSA in the rate of minor complications (odds ratio 1.17, 95% confidence interval 0.70–1.92) or major complications (odds ratio 1.19, 95% confidence interval 0.54–2.63). The odds ratio was also not significantly increased when a cutoff value of 10 or 15/h was used to delineate a positive sleep study. Conclusion For patients undergoing endoscopy procedures under conscious sedation, the presence of OSA does not clearly increase the risk of cardiorespiratory complications.
Studies that compare different types of complete denture teeth have repeatedly emphasized the imp... more Studies that compare different types of complete denture teeth have repeatedly emphasized the importance of standardizing all denture factors, except the type of teeth. Within-subject comparisons have also been recommended to avoid personal differences between patients. For optimum results, one denture should be constructed for each patient with interchangeable teeth. This article describes a simple and accurate procedure for constructing dentures with interchangeable posterior teeth. (J Prosthet Dent 1997;78:609-13.)
Placing craniofacial implants in a 2-stage procedure requires an additional second-stage surgery ... more Placing craniofacial implants in a 2-stage procedure requires an additional second-stage surgery that is tedious for patients and clinicians and results in additional cost.The purpose of this study was to clinically evaluate the use of a newly designed craniofacial implant for retaining facial prostheses, placed in a single-stage surgical procedure.Twenty-one newly designed craniofacial implants (OsteoCare Implant System) were placed in 7 patients, all seeking implant-retained auricular prostheses, using a single-stage surgical procedure. Modified O-ring abutments were directly screwed onto the implants at the time of surgery. Plastic washers were attached to the O-ring heads of the exposed abutments to avoid skin overgrowth to allow a single-stage surgical procedure. After a delayed loading period of 4 months, a silicone prosthetic ear was fabricated and retained using clips over the O-ring abutments. Implants and surrounding tissues were clinically evaluated at 1, 6, and 12 months following prosthesis insertion. The following were evaluated: periimplant abutment sebaceous crusting, periimplant abutment exudate, skin thickness, periimplant abutment tissue reaction, and implant mobility. Data was collected and statistically analyzed using the nonparametric Friedman's test for overall comparisons and Wilcoxon signed rank test for post hoc assessment of significance between follow-up periods.None of the implants failed to osseointegrate, providing a survival rate of 100%. Periimplant abutment sebaceous crusting values were significantly reduced at the 12-month test session (P<.05). Periimplant abutment skin thickness was also significantly reduced (P<.05) between the 6- and 12-month, and 1- and 12-month, follow-up visits. No significant difference was found throughout the follow-up period for periimplant abutment exudates and tissue reactions. None of the implants showed any signs of mobility throughout the study period.The use of the single-stage surgical procedure, together with the newly designed craniofacial implants, provided a high survival rate for an evaluation period of up to 2.5 years in the present investigation. (J Prosthet Dent 2008;100:375-383)
Statement of problem. Posterior tooth form selection for implant overdentures is made according t... more Statement of problem. Posterior tooth form selection for implant overdentures is made according to personal preference and experience using the concepts of conventional complete denture prosthodontics.Purpose. This study (1) compared the masticatory efficiency of three occlusal forms, 0 degrees, 30 degrees, and lingual contact (lingualized occlusion), in subjects with mandibular implant overdentures, and (2) determined their effects on the implant supporting tissues.Material and methods. Eight patients who had four root form implants in the mandibular symphysis area connected with a Hader bar were selected. Maxillary and mandibular dentures were constructed for each patient with interchangeable posterior segments and the three occlusal forms were tested. The masticatory efficiency for each posterior tooth form was assessed with objective food tests and a subjective patient preference questionnaire. Periodic evaluation of implant-supporting tissues also was performed.Results. Reliability analysis showed that all R1 coefficients were ≥0.80 (<0.001), indicating high subject consistency between multiple chewing efficiency trials. MANOVA analysis indicated a significant difference in chewing efficiency among the three occlusal forms ( p < 0.001). The 0 degree occlusal form was associated with a significantly higher number of chewing strokes compared with 30 degrees or lingualized occlusal forms. The different occlusal forms were not found to have a clinically detrimental effect on the peri-implant soft or hard tissues.Conclusion. Chewing efficiency tests and patient preference ratings showed that 30 degree teeth and lingual contact provided better chewing efficiency than 0 degree teeth. None of the tested occlusal forms showed any clinical or radiographic detrimental effect on the implant-supporting tissues. (J Prosthet Dent 1998;79:422-9.)
ABSTRACT In recent years, OFDM has been the focus of extensive research efforts in optical transm... more ABSTRACT In recent years, OFDM has been the focus of extensive research efforts in optical transmission and networking, initially as a means to overcome physical impairments in optical communications. However, unlike, say, in wireless LANs or xDSL systems where OFDM is deployed as a transmission technology in a single link, in optical networks it is being considered as the technology underlying the novel elastic network paradigm. Consequently, network-wide spectrum management arises as the key challenge to be addressed in network design and control. In this work, we review and classify a range of spectrum management techniques for elastic optical networks, including offline and online routing and spectrum assignment (RSA), distance-adaptive RSA, fragmentation-aware RSA, traffic grooming, and survivability.
Background Patients with obstructive sleep apnea (OSA) have an increased risk of perioperative co... more Background Patients with obstructive sleep apnea (OSA) have an increased risk of perioperative complications. Aim The purpose of this study is to assess whether OSA increases the risk of cardiorespiratory complications in patients undergoing endoscopic procedures. Methods A retrospective study was performed. We identified all patients who had undergone both an endoscopic procedure under conscious sedation and a sleep study from January 2001 to May 2008. Patients were divided into four groups: OSA negative (apnea–hypopnea index (AHI) 30/h. Minor and major complications were identified. The minor ones were hypertension, hypotension, bradycardia, tachycardia, oxygen desaturation ( Results Procedures were performed in 639 patients: colonoscopies 68.5%, upper endoscopies 20.2%, and combined procedures 11.3%. The mean age was 60.5 years, mean body mass index 33.7, and 93% were males. Sleep study results: 130 negative, 509 positive; 135 mild, 125 moderate, and 249 severe. Of the patients, 19% had minor complications, while 7% had major complications. There was no significant difference between the patients with and without OSA in the rate of minor complications (odds ratio 1.17, 95% confidence interval 0.70–1.92) or major complications (odds ratio 1.19, 95% confidence interval 0.54–2.63). The odds ratio was also not significantly increased when a cutoff value of 10 or 15/h was used to delineate a positive sleep study. Conclusion For patients undergoing endoscopy procedures under conscious sedation, the presence of OSA does not clearly increase the risk of cardiorespiratory complications.
Studies that compare different types of complete denture teeth have repeatedly emphasized the imp... more Studies that compare different types of complete denture teeth have repeatedly emphasized the importance of standardizing all denture factors, except the type of teeth. Within-subject comparisons have also been recommended to avoid personal differences between patients. For optimum results, one denture should be constructed for each patient with interchangeable teeth. This article describes a simple and accurate procedure for constructing dentures with interchangeable posterior teeth. (J Prosthet Dent 1997;78:609-13.)
Placing craniofacial implants in a 2-stage procedure requires an additional second-stage surgery ... more Placing craniofacial implants in a 2-stage procedure requires an additional second-stage surgery that is tedious for patients and clinicians and results in additional cost.The purpose of this study was to clinically evaluate the use of a newly designed craniofacial implant for retaining facial prostheses, placed in a single-stage surgical procedure.Twenty-one newly designed craniofacial implants (OsteoCare Implant System) were placed in 7 patients, all seeking implant-retained auricular prostheses, using a single-stage surgical procedure. Modified O-ring abutments were directly screwed onto the implants at the time of surgery. Plastic washers were attached to the O-ring heads of the exposed abutments to avoid skin overgrowth to allow a single-stage surgical procedure. After a delayed loading period of 4 months, a silicone prosthetic ear was fabricated and retained using clips over the O-ring abutments. Implants and surrounding tissues were clinically evaluated at 1, 6, and 12 months following prosthesis insertion. The following were evaluated: periimplant abutment sebaceous crusting, periimplant abutment exudate, skin thickness, periimplant abutment tissue reaction, and implant mobility. Data was collected and statistically analyzed using the nonparametric Friedman's test for overall comparisons and Wilcoxon signed rank test for post hoc assessment of significance between follow-up periods.None of the implants failed to osseointegrate, providing a survival rate of 100%. Periimplant abutment sebaceous crusting values were significantly reduced at the 12-month test session (P<.05). Periimplant abutment skin thickness was also significantly reduced (P<.05) between the 6- and 12-month, and 1- and 12-month, follow-up visits. No significant difference was found throughout the follow-up period for periimplant abutment exudates and tissue reactions. None of the implants showed any signs of mobility throughout the study period.The use of the single-stage surgical procedure, together with the newly designed craniofacial implants, provided a high survival rate for an evaluation period of up to 2.5 years in the present investigation. (J Prosthet Dent 2008;100:375-383)
Statement of problem. Posterior tooth form selection for implant overdentures is made according t... more Statement of problem. Posterior tooth form selection for implant overdentures is made according to personal preference and experience using the concepts of conventional complete denture prosthodontics.Purpose. This study (1) compared the masticatory efficiency of three occlusal forms, 0 degrees, 30 degrees, and lingual contact (lingualized occlusion), in subjects with mandibular implant overdentures, and (2) determined their effects on the implant supporting tissues.Material and methods. Eight patients who had four root form implants in the mandibular symphysis area connected with a Hader bar were selected. Maxillary and mandibular dentures were constructed for each patient with interchangeable posterior segments and the three occlusal forms were tested. The masticatory efficiency for each posterior tooth form was assessed with objective food tests and a subjective patient preference questionnaire. Periodic evaluation of implant-supporting tissues also was performed.Results. Reliability analysis showed that all R1 coefficients were ≥0.80 (<0.001), indicating high subject consistency between multiple chewing efficiency trials. MANOVA analysis indicated a significant difference in chewing efficiency among the three occlusal forms ( p < 0.001). The 0 degree occlusal form was associated with a significantly higher number of chewing strokes compared with 30 degrees or lingualized occlusal forms. The different occlusal forms were not found to have a clinically detrimental effect on the peri-implant soft or hard tissues.Conclusion. Chewing efficiency tests and patient preference ratings showed that 30 degree teeth and lingual contact provided better chewing efficiency than 0 degree teeth. None of the tested occlusal forms showed any clinical or radiographic detrimental effect on the implant-supporting tissues. (J Prosthet Dent 1998;79:422-9.)
ABSTRACT In recent years, OFDM has been the focus of extensive research efforts in optical transm... more ABSTRACT In recent years, OFDM has been the focus of extensive research efforts in optical transmission and networking, initially as a means to overcome physical impairments in optical communications. However, unlike, say, in wireless LANs or xDSL systems where OFDM is deployed as a transmission technology in a single link, in optical networks it is being considered as the technology underlying the novel elastic network paradigm. Consequently, network-wide spectrum management arises as the key challenge to be addressed in network design and control. In this work, we review and classify a range of spectrum management techniques for elastic optical networks, including offline and online routing and spectrum assignment (RSA), distance-adaptive RSA, fragmentation-aware RSA, traffic grooming, and survivability.
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