Lượt truy cập
3060089

Literature Update Nov - Dec 2010

Clinical Implant Dentistry and Related Research

Vol. 12 No. 4 (December 2010)

Dahlin C, Simion M, Hatano N.  Long-term follow-up on soft and hard tissue levels following guided bone regeneration treatment in combination with a xenogeneic filling material: a 5-year prospective clinical study. Clin Implant Dent Relat Res 2010;12(4):263-270.

A total of 41 implants were placed conjunction with GBR in 20 patients and followed up for 5 years. The cumulative survival rate was 97.5% and the reduction in mean bone height was from -3.51 mm to -2.38 mm. Marginal soft tissue level was stable throughout the  5-year period. GBR in conjunction with implant placement is therefore a viable treatment option to maintain hard and soft tissue levels.

Hjalmarsson L, Örtorp A, Smedberg J-I, Jemt T. Precision of fit to implants: a comparison of Cresco and Procera implant bridge frameworks. Clin Implant Dent Relat Res 2010;12(4):271-280.

Titanium or Co-Cr Cresco frameworks and titanium Procera frameworks for implant-supported fixed compete prostheses were fabricated and measurements of fit on implants calculated. The maximal 3D range of center point distortion was 279  μm. Framework width increased in the titanium frameworks but decreased for Cresco-CoCr, and fewer distortions were apparent in the vertical dimension for the Procera versus the Cresco frameworks. However, no complete passive fit was observed for any of the frameworks.

Shibli JA, Grassi S, Piattelli A, Pecora GE, Ferrari DS, Onuma T, D’Avila S, Coelho PG, Barros R, Iezzi G. Histomorphometric evaluation of bioceramic molecular impregnated and dual acid-etched implant surfaces in the human posterior maxilla. Clin Implant Dent Relat Res 2010;12(4):281-288.

Implants with a dual acid-etched surface (control) and with bioceramic molecular impregnation (test) were placed in 10 subjects (one of each surface in each subject) during conventional implant surgery in the maxilla. The implants were removed and evaluated after 2 months. Significantly higher BIC and osteocyte index values were found for the test implants but there was no significant difference in bone density in threaded area between the two groups. The bioceramic molecular impregnation therefore appeared to have a positive influence on early bone healing.

Gahlert M, Röhling S, Wieland M, Eichhorn S, Küchenhoff H, Kniha H.  A comparison study of the osseointegration of zirconia and titanium dental implants. A biomechanical evaluation in the maxilla of pigs. Clin Implant Dent Relat Res 2010;12(4):297-305.

Acid-etched zirconia implants and sandblasted and acid-etched titanium implants were placed in the maxillae of 16 pigs 6 months after the extraction of second and third incisors. Removal torque was assessed after 4, 8 and 12 weeks. Removal torque values for the zirconia and titanium implants were 42.4 Ncm and 42.1 Ncm, respectively, after 4 weeks, 69.6 Ncm and 75.0 Ncm, respectively after 8 weeks, and 69.3 Ncm and 73.1 Ncm, respectively, after 12 weeks. The results indicated that bone apposition was similar between zirconia and titanium implants.

 

Balleri P, Ferrari M, Veltri M. One-year outcome of implants placed  strategically in the retrocanine bone triangle. Clin Implant Dent Relat Res 2010;12(4):324-330.

A total of 40 implants were placed in the bone anterior to the sinus wall in 20 patients with atrophic posterior maxillae. Three-unit screw-retained FPDs were placed after 6 months. After 1 year of loading, there were no implant failures or biological or mechanical complications, and there were no differences in bone level between axial and tilted implants. Three-unit FPDs supported by two implants therefore showed positive outcomes in the maxillary retrocanine region.

Clinical Oral Implants Research

Vol. 21 No. 11 (November 2010)

Vol. 21 No. 12 (December 2010)

Koong B.  Cone beam imaging: is this the ultimate imaging modality?  Clin Oral Implants Res 2010;21(11):1201-1208.

Cone beam imaging is an essential technique that all clinicians should be familiar with, and should be considered in daily clinical practice if low-dose systems and protocols are used. The technique complements 2D radiographic and other techniques, although multislice computed tomography may be more powerful and flexible, and is the technique of choice for many.  However, all techniques should be evaluated in their entirety, and the clinician skill levels and responsibilities, and medico-legal implications need to be considered.

Van Der Bilt A, Burgers M, Van Kampen FMC, Cune MS. Mandibular implant-supported overdentures and oral function. Clin Oral Implants Res 2010;21(11):1209-1213.

Patients who had received two mandibular implants and an overdenture with magnet, ball-socket or bar-clip attachments were evaluated for oral function 10 years after participation in a clinical trial. Of the original 18 patients, 14 were evaluated at the 10-year follow-up. Maximum bite force increased from 162 N to 341 N after implant treatment, and the number of chewing cycles decreased from 55 to 27; no significant changes were seen after 10 years. The improvement in oral function with implant-supported overdentures was therefore maintained for a long time.

 Van de Velde T, Sennerby L, De Bruyn H. The clinical and radiographic outcome of implants placed in the posterior maxilla with a guided flapless approach and immediately restored with a provisional rehabilitation: a randomized clinical trial. Clin Oral Implants Res 2010;21(11):1223-1233.

Implants were placed in the bilateral maxillary edentulous areas of 14 patients in a split-mouth design: a stereolithographic guide was used in one side and implants were immediately loaded (test; 36 implants), and a conventional protocol and loading after 6 weeks (control; 34 implants) was performed on the other side. Clinical and radiographic analyses were performed after 1 and 6 weeks, and 3, 6, 12 and 18 months. Implant survival was 97.3% and 100% in the test and control groups, respectively. Mean bone level after 18 months was 1.95 ± 0.70 mm and 1.93 ± 0.42 mm for test and control groups, respectively. Differences between test and control sides were found in the first 6 weeks for speech, function, esthetics, self-confidence and overall appreciation, and there was a significant difference change in height of the attached mucosa at implants placed with a conventional flap after 1 and 6 weeks.