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Residual ridge resorption in the edentulous maxilla in patients with implant-supported mandibular overdentures: An 8-year retrospective study
THE JOURNAL OF PROSTHETIC DENTISTRY
the use of autopolymerizing resin and minimizes the noxious odor associated with intraoral acrylic resin polymerization. Because the completed device retains some flexibility, it is possible to remove it from moderate undercuts without patient discomfort. Thermoplastic materials do not lend themselves to trimming with rotary instruments but should be trimmed with a sharp blade. With some practice, a stable and functional anterior deprogramming device can be made in about 3 to 4 minutes. REFERENCES 1. Urstein M, Fitzig S, Moskona D, Cardash HS. A clinical evaluation of materials used in registering interjaw relationships. J Prosthet Dent 1991; 65:372-7. 2. Rosenstiel SF, Land MF, Fujimoto J. Contemporary fixed prosthodontics. 3rd ed. St. Louis: Elsevier; 2000. p. 38. 3. Hunter BD 2nd, Toth RW. Centric relation registration using an anterior deprogrammer in dentate patients. J Prosthodont 1999;8:59-61.
Noteworthy Abstracts of the Current Literature
LAND AND PEREGRINA
4. Lucia VO. A technique for recording centric relation. J Prosthet Dent 1964;14:492-505. 5. Carroll WJ, Woelfel JB, Huffman RW. Simple application of anterior jig or leaf gauge in routine clinical practice. J Prosthet Dent 1988;59:611-7. 6. Okeson JP. Management of temporomandibular disorders and occlusion. 5th ed. St. Louis: Elsevier; 2002. p. 283-4. 7. Karl PJ, Foley TF. The use of a deprogramming appliance to obtain centric relation records. Angle Orthod 1999;69:117-24. Reprint requests to: DR MARTIN F. LAND SOUTHERN ILLINOIS UNIVERSITY SCHOOL OF DENTAL MEDICINE 2800 COLLEGE AVE BLDG. 284 ALTON, IL 62002 FAX: (618) 475-7150 E-MAIL: [email protected] Copyright © 2003 by The Editorial Council of The Journal of Prosthetic Dentistry. 0022-3913/2003/$30.00 ⫹ 0 doi:10.1016/j.prosdent.2003.09.011
Residual ridge resorption in the edentulous maxilla in patients with implant-supported mandibular overdentures: An 8-year retrospective study Kreisler M, Behneke N, Behneke A, d’Hoedt B. Int J Prosthodont 2003;16:295-300.
Purpose. This retrospective study radiologically investigated alveolar bone resorption in the edentulous maxilla in patients with implant-supported mandibular overdentures. Materials and Methods. This study consisted of 35 healthy, completely edentulous patients with a mean age of 59.7 years. They had received 2 implants between the mental foramina. New bar-retained mandibular overdentures and maxillary complete dentures were fabricated. Standardized panoramic radiographs taken subsequent to loading and at annual recall visits for up to 8 years were measured for alveolar bone loss in the maxilla. Bone areas and areas of reference not subject to resorption were measured with a planimetry program. The proportional value between both was expressed as a ratio (R). Bone loss was expressed as a change in R between 2 time points. Differences in the resorption rate between the anterior and posterior parts of the maxilla were investigated. Results. Residual ridge resorption continued during the follow-up period and revealed high individual variability. With a range of 5% to 11% (median) loss in the original bone height, it was significantly (P⬍.031) more pronounced in the anterior than posterior maxilla (2%-7%) from the second through eighth years. Regression analysis of the medians revealed a relatively high correlation between time and bone loss in both anterior and posterior parts of the maxilla. Conclusion. The anterior anchorage of mandibular overdentures by means of 2 implants and an ovoid bar was associated with slightly higher resorption in the anterior than in the posterior part of the edentulous maxilla.—Reprinted with permission of Quintessence Publishing.
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VOLUME 90 NUMBER 6
the use of autopolymerizing resin and minimizes the noxious odor associated with intraoral acrylic resin polymerization. Because the completed device retains some flexibility, it is possible to remove it from moderate undercuts without patient discomfort. Thermoplastic materials do not lend themselves to trimming with rotary instruments but should be trimmed with a sharp blade. With some practice, a stable and functional anterior deprogramming device can be made in about 3 to 4 minutes. REFERENCES 1. Urstein M, Fitzig S, Moskona D, Cardash HS. A clinical evaluation of materials used in registering interjaw relationships. J Prosthet Dent 1991; 65:372-7. 2. Rosenstiel SF, Land MF, Fujimoto J. Contemporary fixed prosthodontics. 3rd ed. St. Louis: Elsevier; 2000. p. 38. 3. Hunter BD 2nd, Toth RW. Centric relation registration using an anterior deprogrammer in dentate patients. J Prosthodont 1999;8:59-61.
Noteworthy Abstracts of the Current Literature
LAND AND PEREGRINA
4. Lucia VO. A technique for recording centric relation. J Prosthet Dent 1964;14:492-505. 5. Carroll WJ, Woelfel JB, Huffman RW. Simple application of anterior jig or leaf gauge in routine clinical practice. J Prosthet Dent 1988;59:611-7. 6. Okeson JP. Management of temporomandibular disorders and occlusion. 5th ed. St. Louis: Elsevier; 2002. p. 283-4. 7. Karl PJ, Foley TF. The use of a deprogramming appliance to obtain centric relation records. Angle Orthod 1999;69:117-24. Reprint requests to: DR MARTIN F. LAND SOUTHERN ILLINOIS UNIVERSITY SCHOOL OF DENTAL MEDICINE 2800 COLLEGE AVE BLDG. 284 ALTON, IL 62002 FAX: (618) 475-7150 E-MAIL: [email protected] Copyright © 2003 by The Editorial Council of The Journal of Prosthetic Dentistry. 0022-3913/2003/$30.00 ⫹ 0 doi:10.1016/j.prosdent.2003.09.011
Residual ridge resorption in the edentulous maxilla in patients with implant-supported mandibular overdentures: An 8-year retrospective study Kreisler M, Behneke N, Behneke A, d’Hoedt B. Int J Prosthodont 2003;16:295-300.
Purpose. This retrospective study radiologically investigated alveolar bone resorption in the edentulous maxilla in patients with implant-supported mandibular overdentures. Materials and Methods. This study consisted of 35 healthy, completely edentulous patients with a mean age of 59.7 years. They had received 2 implants between the mental foramina. New bar-retained mandibular overdentures and maxillary complete dentures were fabricated. Standardized panoramic radiographs taken subsequent to loading and at annual recall visits for up to 8 years were measured for alveolar bone loss in the maxilla. Bone areas and areas of reference not subject to resorption were measured with a planimetry program. The proportional value between both was expressed as a ratio (R). Bone loss was expressed as a change in R between 2 time points. Differences in the resorption rate between the anterior and posterior parts of the maxilla were investigated. Results. Residual ridge resorption continued during the follow-up period and revealed high individual variability. With a range of 5% to 11% (median) loss in the original bone height, it was significantly (P⬍.031) more pronounced in the anterior than posterior maxilla (2%-7%) from the second through eighth years. Regression analysis of the medians revealed a relatively high correlation between time and bone loss in both anterior and posterior parts of the maxilla. Conclusion. The anterior anchorage of mandibular overdentures by means of 2 implants and an ovoid bar was associated with slightly higher resorption in the anterior than in the posterior part of the edentulous maxilla.—Reprinted with permission of Quintessence Publishing.
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VOLUME 90 NUMBER 6