Comparisons of Precision of Fit Between Cast and Computer Numeric Controlled Milled Titanium Implant Frameworks for the Edentulous Mandible

INTRODUCTION: Titanium frameworks have for the last decade been discussed as an option to conventional gold alloy castings in implant dentistry. So far no reports have been made to show milled titanium frameworks and their difference in precision compared to conventional castings, and how laboratory handling andfusing of veneers to the titanium frames affect the precision of fit. PURPOSE: To investigate and compare the precision of fabrication in repeatedly produced Computer Numeric Controlled milled frameworks with conventional castings, and to analyze the distortion from application of different veneering materials (porcelain and acrylic resin veneers). MATERIAL AND METHODS: Twenty identical titanium frameworks were fabricated by means of a Computer Numeric Controlled milling technique for one and the same master model. Five conventional frameworks were cast as a control group to the same model. The frames were measured with regard to fit in a coordinate measuring machine linked to a computer. Measurements were made during different stages of handling of the titanium framework, and after veneering materials had been applied. RESULTS: The Computer Numeric Controlled frameworks showed a statistically (p0.05) affect the fit of the titanium frameworks. CONCLUSION: It is possible to fabricate implant supported titanium frameworks by means of the present Computer Numeric Controlled technique with very high precision and repeatability

Comparisons of Precision of Fit Between Cast and Computer Numeric Controlled Milled Titanium Implant Frameworks for the Edentulous Mandible

INTRODUCTION: Titanium frameworks have for the last decade been discussed as an option to conventional gold alloy castings in implant dentistry. So far no reports have been made to show milled titanium frameworks and their difference in precision compared to conventional castings, and how laboratory handling andfusing of veneers to the titanium frames affect the precision of fit. PURPOSE: To investigate and compare the precision of fabrication in repeatedly produced Computer Numeric Controlled milled frameworks with conventional castings, and to analyze the distortion from application of different veneering materials (porcelain and acrylic resin veneers). MATERIAL AND METHODS: Twenty identical titanium frameworks were fabricated by means of a Computer Numeric Controlled milling technique for one and the same master model. Five conventional frameworks were cast as a control group to the same model. The frames were measured with regard to fit in a coordinate measuring machine linked to a computer. Measurements were made during different stages of handling of the titanium framework, and after veneering materials had been applied. RESULTS: The Computer Numeric Controlled frameworks showed a statistically (p0.05) affect the fit of the titanium frameworks. CONCLUSION: It is possible to fabricate implant supported titanium frameworks by means of the present Computer Numeric Controlled technique with very high precision and repeatability

The In Vivo Wear Resistance of 12 Composite Resins

: The in vivo wear resistance of 12 composite resins were compared with an amalgam control using the Latin Square experimental design. Sixteen edentulous patients wearing specially designed complete dentures formed the experimental population. Materials and Methods : The Michigan Computer Graphics Measurement System was used to digitize the surface of the control and composite resin samples before and after 3-month test periods to obtain wear data. The 12 composite resins selected for this investigation based on their published composite classification types were seven fine particle composites, three blends, and two microfilled composite resins. The Latin Square experimental design was found to be valid with the factor of material being statistically different at the 5% level of significance. Wear was computed as volume loss (mm 3 /mm 2 ), and all of the composites studied had more wear than the amalgam control ( P = .001). Results : After 3 months, the mean (error) of wear of the amalgam was 0.028 (0.006). Means (error) of wear for the 12 composites were ranked from most to least wear by mean wear volume loss. Conclusions : The absence of any relationship between mean wear volume loss and the volume percentage filler was confirmed by the correlation coefficient r = -0.158.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/72960/1/j.1532-849X.1992.tb00419.x.pd

The Role of Implant Position on Longâ Term Success

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141259/1/cap0187.pd

State of the science on controversial topics: missing maxillary lateral incisors--a report of the Angle Society of Europe 2012 meeting.

BACKGROUND: The optimal long-term management of the congenitally missing maxillary lateral incisor continues to cause controversy within the specialty. The Angle Society of Europe meeting 2012 dedicated a day to address some of the current controversies relating to the management of these missing lateral incisors. FINDINGS: The format of the day consisted of morning presentations and afternoon breakout sessions to discuss a variety of questions related to the management of missing lateral incisors. CONCLUSIONS: The consensus viewpoint from this day was that the care of patients with congenitally missing lateral incisors is best achieved through a multi-disciplinary approach. The current evidence base is weak, and further well-designed, prospective trials are needed

Soft and hard tissue assessment of immediate implant placement: a case series

Objectives : The aim of this prospective study was to evaluate clinically and radiographically the success and esthetic result of immediate implant placement at the time of extraction. Material and methods : Twelve patients with 14 titanium screw-shaped implants (13–16 mm length and 4.3 or 5 mm diameters) were placed in the extraction sockets. Defects after implant placement were recorded, and then filled up with deproteinized bovine bone mineral, bioabsorbable collagen membrane, and absorbable pins. The defect was again re-evaluated at second-stage surgery. Clinical and radiographic parameters of the peri-implant conditions were assessed at the moment of prosthesis placement and at 1-year follow-up. Results : The cumulative implant survival and success rate was 100% after a 1-year observation period. Analysis of the esthetic result showed that the mean pink esthetic score (PES) was 11.1 (SD 1.35) at 1-year follow-up. At 1 year, 64.3% papillae had a score of 2 and the remaining 35.7% score 3 according to the Jemt (1997) papillary index. Optimal value of width of the keratinized mucosa was recorded in 13 (92.9%) implant cases in both periods of follow-up. At 1-year follow-up, the linear distance between implant-shoulder to the bone peaks remains stable with a mean of 2.62±0.2 mm at the mesial and 2.9±0.58 mm at the distal aspect. Conclusion : Careful evaluation of potential extraction sites before immediate implant installation promotes optimal implant esthetics. To cite this article: Juodzbalys G, Wang H-L. Soft and hard tissue assessment of immediate implant placement: a case series. Clin. Oral Impl. Res. 18 , 2007; 237–243 doi:10.1111/j.1600-0501.2006.01312.xPeer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/74957/1/j.1600-0501.2006.01312.x.pd

Effect of Microthreads and Platform Switching on Crestal Bone Stress Levels: A Finite Element Analysis

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/142288/1/jper2166.pd