Jack Hahn - Academia.edu (original) (raw)

Papers by Jack Hahn

PubMed, Aug 1, 1993

Implant dentistry has made great advances since its inception several decades ago. As a result, p... more Implant dentistry has made great advances since its inception several decades ago. As a result, predictability and success have reached high levels. Nonetheless, efforts continue to further refine implant design, materials, and techniques to reduce even the small percentage of failures that still occur. As part of this effort, the authors for the past six years have conducted clinical trials of Steri-Oss threaded titanium implants and HA-coated implants. The results have been consistent with the body of implant research reported since the 1970s. Optimum implant performance is realized when a well-designed system such as those tested is utilized in association with astute clinical judgment.

PubMed, 1994

In restoring our patients to comfort, form, function, and aesthetics, it is often necessary to pl... more In restoring our patients to comfort, form, function, and aesthetics, it is often necessary to place one or more implants to provide support to the desired prosthesis. This presentation and paper discuss the principles of implants and prostheses, based on the author's 25 years of clinical experience in implant dentistry. Occlusal scheme, treatment of overdenture, use of abutments and attachments, single tooth replacements, quality and quantity of bone, and the selection of implants are considered.

International Journal of Oral Implantology and Clinical Research, 2010

As more and more patients present to dental offices requiring extraction and replacement of teeth... more As more and more patients present to dental offices requiring extraction and replacement of teeth in the esthetic zone, the pro ffered treatment options range from a removable prosthesis as a temporary measure to three unit bridges and implants. Of these modalit ies, more and more patients prefer the implant option especially if it can be performed immediately. The author has placed and resto red 2700 immediate implants in the 13 years per iod between 1996 and 2009 and discusses the principles of immediate implants.

PubMed, 1995

An ongoing prospective clinical trial is being conducted at three study sites to evaluate the saf... more An ongoing prospective clinical trial is being conducted at three study sites to evaluate the safety and efficacy of a threaded, hydroxylapatite-coated implant (Steri-Oss Inc., Yorba Linda, CA) in a patient population reflective of the investigators' overall population of implant candidates. The 2062 implants placed and restored among 720 patients over the five-year period up to the study interim analysis cut-off date (November, 1994) include over 600 implants and 200 patients at each study site. Mean age and sex distribution of patients were comparable among the study sites. Study design attributes included well-defined patient selection criteria, standardized study procedures, standardized measurement and observation methodology, complete data accountability, and rigorously applied implant success/failure criteria. Thirty-five implants were considered failures at exposure, and the surgical success rate was 98.3%. Of 65 implants that failed post-restoration, three were removed, while 62 remained functional and in service. The five-year post-restoration follow-up success rate, determined by means of life table methodology, was 96.0%. By region, the five-year life table success rates post-restoration were 94.3% in the anterior maxilla, 96.6% in the posterior maxilla, 97.2% in the anterior mandible, and 95.6% in the posterior mandible. Adverse events occurred in association with less than 1% of the implants placed.

Journal of Oral Implantology, Jul 1, 2000

With appropriate patient selection, single-stage surgery, immediate loading, and flapless site pr... more With appropriate patient selection, single-stage surgery, immediate loading, and flapless site preparation are dependable treatment approaches that offer significant benefits to implant patients. This paper briefly reviews the history of these approaches and describes the conditions necessary to achieve long-term success. Case studies also are included.

Journal of Oral Implantology, Apr 1, 2011

The aim of this study was to prospectively evaluate treatment outcomes of 1-piece implants (Nobel... more The aim of this study was to prospectively evaluate treatment outcomes of 1-piece implants (NobelDirect and NobelPerfect, Nobel Biocare AB, Gothenberg, Sweden) in routine private clinical practice. Forty-seven implants placed in 30 subjects demonstrated a cumulative survival rate of 97.9% with stable marginal bone levels after 4 years of loading.

Implant Dentistry, May 1, 1996

A data subset from an ongoing prospective multicenter clinical study of threaded hydroxyapatite-c... more A data subset from an ongoing prospective multicenter clinical study of threaded hydroxyapatite-coated implants was evaluated to assess safety and efficacy of the implants in anterior maxillary regions when used to support fixed prostheses. Observations were recorded before surgery, at first-stage surgery, at second-stage surgery, at loading, and at quarterly post-restoration prophylactic exams and annual comprehensive patient visits. Of 2,062 implants restored in 720 patients in the parent study, a total of 95 implants in 54 patients met the criteria for inclusion into this portion. Implant failure criteria included mobility, radiographic evidence of bone loss greater than one-third the length of the implant or peri-implant radiolucency, fracture, exfoliation, removal for any reason, and patient reported pain upon palpation. Soft tissue indices were monitored as part of the study. Post-restoration implant performance was analyzed using life-table methodology. No failures were observed before prosthodontic rehabilitation. Three implants failed during an observation period of up to 5 years after completion of prosthodontic treatment. The Cutler-Ederer life table success rate after 5 years was 93.4 percent. Results of this investigation suggest that threaded hydroxyapatite-coated implants are safe and effective when placed in anterior maxillary regions to support fixed prostheses.

Journal of Oral Implantology, Apr 1, 2005

Immediately loaded 1-piece dental implants were a standard treatment modality more than 30 years ... more Immediately loaded 1-piece dental implants were a standard treatment modality more than 30 years ago and, on occasion, resulted in excellent clinical successes. However, this technology also became associated with significant failure rates and fell out of favor. Since then, understanding of the site requirements and placement procedures necessary to ensure primary stability have advanced considerably. Implant designs and surface treatments also have evolved. In light of this greater understanding, a 1-piece root-form implant system has been developed. This article describes 4 clinical cases in which use of the new system was employed. In each case, the results included excellent stability, esthetics, and patient satisfaction.

Journal of Oral Implantology, Jun 1, 2007

This single-center investigation of consecutively placed 1-piece implants reports on treatment ou... more This single-center investigation of consecutively placed 1-piece implants reports on treatment outcomes in an ordinary patient pool. Forty-seven implants placed in 30 subjects demonstrated beneficial marginal bone levels and a survival rate of 97.9% after up to 3 years of loading.

Journal of Oral Implantology, 1999

Osteotomes can offer several significant advantages over the traditional graded series of drills.... more Osteotomes can offer several significant advantages over the traditional graded series of drills. Osteotomes take advantage of the fact that bone is visco-elastic and can be compressed and manipulated. Compression creates a denser area for implant placement. Heat is a major detriment to osseointegration, but the osteotome technique does not generate heat. This technique also allows for greater tactile sensitivity. Three procedures are used: compaction, cortical floor elevation, and ridge expansion; these can be combined to facilitate implantation. If the practitioner recognized the properties of bone and understands how bone responds to manipulation, the techniques described here can aid in the preparation for the placement of dental implants with greater success.

Journal of the American Dental Association, Sep 1, 1990

Implant Dentistry, 1995