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Implant overdenture impressions using a dynamic impression concept.

Byung Kil LEE ; Sang Hun PARK ; Cheong Hee LEE ; Jin Hyun CHO

The Journal of Advanced Prosthodontics.2014;6(1):66-69. doi:10.4047/jap.2014.6.1.66

A dynamic impression is a functional impression that records the functional movement of the patient's own muscle and muscle attachment. This process reduces the number of random factors. This article describes a method for making a special tray using a dynamic impression concept that was made from provisional dentures used for implant healing. The individual tray is used to make a wash-impression to record the features of the mucosa in detail. The main advantage of this technique is that it provides a functional relationship of the implant components to the supporting tissues without overextension because provisional denture had been used for 2 months and the border length of individual tray was nearly the same as that of provisional denture. The delivery of the prosthesis constructed using this impression technique is time-saving because there is no need for border molding and there are fewer post-insertion appliance adjustments.
Denture, Overlay* ; Dentures ; Fungi ; Mucous Membrane ; Muscles ; Prostheses and Implants

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Dental fiber-post resin base material: a review.

Aashwini LAMICHHANE ; Chun XU ; Fu Qiang ZHANG

The Journal of Advanced Prosthodontics.2014;6(1):60-65. doi:10.4047/jap.2014.6.1.60

Teeth that have short clinical crown, which are not alone enough to support the definitive restoration can be best treated using the post and core system. The advantages of fiber post over conventional metallic post materials have led to its wide acceptance. In addition to that the combination of aesthetic and mechanical benefits of fiber post has provided it with a rise in the field of dentistry. Also the results obtained from some clinical trials have encouraged the clinicians to use the fiber posts confidently. Fiber posts are manufactured from pre-stretched fibers impregnated within a resin matrix. The fibers could that be of carbon, glass/silica, and quartz, whereas Epoxy and bis-GMA are the most widely used resin bases. But recently studies are also found to be going on for polyimide as possible material for the fiber post resin base as a substitute for the conventional materials.
Bisphenol A-Glycidyl Methacrylate ; Carbon ; Crowns ; Dentin ; Dentistry ; Quartz ; Tooth

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Residual bone height measured by panoramic radiography in older edentulous Korean patients.

Xiang Hua LIANG ; Young Mi KIM ; In Ho CHO

The Journal of Advanced Prosthodontics.2014;6(1):53-59. doi:10.4047/jap.2014.6.1.53

PURPOSE: The aim of this study was to obtain statistical data on the residual bone height at different natural tooth positions by panoramic radiography in edentulous Korean patients aged 60-90 years. MATERIALS AND METHODS: The study included the diagnostic panoramic radiographs of 180 randomly selected edentulous patients without systemic diseases affecting bone. The radiographic selection criteria included absence of obvious facial asymmetry, clearly visible anatomic structures, and no surgical and fracture history. The panoramic radiographs of 79 patients met these criteria and were used in the analysis. The same researcher processed all the radiographs by using a standardized method. The height of the residual bone was measured at 18 predetermined sites (7 in the maxilla and 11 in the mandible) on digitized and printed radiographs by using a Digimatic caliper, triangle, and ruler. Gender- and age-related differences were statistically analyzed by using the t-test and rank-sum test (alpha=0.05). RESULTS: The maxillary residual bone height did not show significant gender-related differences, but male patients had significantly higher residual bone in the mandible(P<.05). No significant height differences at the measured sites were noted among the 60s, 70s, and 80s age groups. CONCLUSION: Dentists should pay greater attention to older female edentulous patients because they are more prone to rapid residual bone resorption. Residual bone resorption may not be affected by age.
Alveolar Bone Loss ; Bone Resorption ; Dental Implants ; Dentists ; Denture, Complete ; Facial Asymmetry ; Female ; Humans ; Male ; Mandible ; Maxilla ; Methods ; Patient Selection ; Radiography ; Radiography, Panoramic* ; Tooth

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A comparative study of gold UCLA-type and CAD/CAM titanium implant abutments.

Ji Man PARK ; Jai Bong LEE ; Seong Joo HEO ; Eun Jin PARK

The Journal of Advanced Prosthodontics.2014;6(1):46-52. doi:10.4047/jap.2014.6.1.46

PURPOSE: The aim of this study was to evaluate the interface accuracy of computer-assisted designed and manufactured (CAD/CAM) titanium abutments and implant fixture compared to gold-cast UCLA abutments. MATERIALS AND METHODS: An external connection implant system (Mark III, n=10) and an internal connection implant system (Replace Select, n=10) were used, 5 of each group were connected to milled titanium abutment and the rest were connected to the gold-cast UCLA abutments. The implant fixture and abutment were tightened to torque of 35 Ncm using a digital torque gauge, and initial detorque values were measured 10 minutes after tightening. To mimic the mastication, a cyclic loading was applied at 14 Hz for one million cycles, with the stress amplitude range being within 0 N to 100 N. After the cyclic loading, detorque values were measured again. The fixture-abutment gaps were measured under a microscope and recorded with an accuracy of +/-0.1 microm at 50 points. RESULTS: Initial detorque values of milled abutment were significantly higher than those of cast abutment (P<.05). Detorque values after one million dynamic cyclic loadings were not significantly different (P>.05). After cyclic loading, detorque values of cast abutment increased, but those of milled abutment decreased (P<.05). There was no significant difference of gap dimension between the milled abutment group and the cast abutment group after cyclic loading. CONCLUSION: In conclusion, CAD/CAM milled titanium abutment can be fabricated with sufficient accuracy to permit screw joint stability between abutment and fixture comparable to that of the traditional gold cast UCLA abutment.
Computer-Aided Design ; Joints ; Mastication ; Titanium* ; Torque

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Three-dimensional accuracy of different correction methods for cast implant bars.

Ji Yung KWON ; Chang Whe KIM ; Young Jun LIM ; Ho Beom KWON ; Myung Joo KIM

The Journal of Advanced Prosthodontics.2014;6(1):39-45. doi:10.4047/jap.2014.6.1.39

PURPOSE: The aim of the present study was to evaluate the accuracy of three techniques for correction of cast implant bars. MATERIALS AND METHODS: Thirty cast implant bars were fabricated on a metal master model. All cast implant bars were sectioned at 5 mm from the left gold cylinder using a disk of 0.3 mm thickness, and then each group of ten specimens was corrected by gas-air torch soldering, laser welding, and additional casting technique. Three dimensional evaluation including horizontal, vertical, and twisting measurements was based on measurement and comparison of (1) gap distances of the right abutment replica-gold cylinder interface at buccal, distal, lingual side, (2) changes of bar length, and (3) axis angle changes of the right gold cylinders at the step of the post-correction measurements on the three groups with a contact and non-contact coordinate measuring machine. One-way analysis of variance (ANOVA) and paired t-test were performed at the significance level of 5%. RESULTS: Gap distances of the cast implant bars after correction procedure showed no statistically significant difference among groups. Changes in bar length between pre-casting and post-correction measurement were statistically significance among groups. Axis angle changes of the right gold cylinders were not statistically significance among groups. CONCLUSION: There was no statistical significance among three techniques in horizontal, vertical and axial errors. But, gas-air torch soldering technique showed the most consistent and accurate trend in the correction of implant bar error. However, Laser welding technique, showed a large mean and standard deviation in vertical and twisting measurement and might be technique-sensitive method.
Axis, Cervical Vertebra ; Welding

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Correlation between microleakage and screw loosening at implant-abutment connection.

Cem SAHIN ; Simel AYYILDIZ

The Journal of Advanced Prosthodontics.2014;6(1):35-38. doi:10.4047/jap.2014.6.1.35

PURPOSE: This study aimed to evaluate the correlation between microleakage and screw loosening at different types of implant-abutment connections and/or geometries measuring the torque values before and after the leakage tests. MATERIALS AND METHODS: Three different abutment types (Intenal hex titanium, internal hex zirconium, morse tapered titaniuim) with different geometries were connected to its own implant fixture. All the abutments were tightened with a standard torque value then the composition was connected to the modified fluid filtration system. After the measurements of leakage removal torque values were re-measured. Kruskal-wallis test was performed for non-parametric and one-way ANOVA was performed for parametric data. The correlation was evaluated using Spearman Correlation Test (alpha=0.05). RESULTS: Significantly higher microleakage was found at the connection of implant-internal hex zirconium abutment. Observed mean torque value loss was also significantly higher than other connection geometries. Spearman tests revealed a significant correlation between microleakage and screw loosening. CONCLUSION: Microleakage may provoke screw loosening. Removing torque values rationally decrease with the increase of microleakage.
Filtration ; Titanium ; Torque ; Zirconium

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Biofilm-forming ability and adherence to poly-(methyl-methacrylate) acrylic resin materials of oral Candida albicans strains isolated from HIV positive subjects.

Emel UZUNOGLU ; Arzu Zeynep YILDIRIM BICER ; Istar DOLAPCI ; Arife DOGAN

The Journal of Advanced Prosthodontics.2014;6(1):30-34. doi:10.4047/jap.2014.6.1.30

PURPOSE: This study evaluated the adhesion to acrylic resin specimens and biofilm formation capability of Candida albicans strains isolated from HIV positive subjects' oral rinse solutions. MATERIALS AND METHODS: The material tested was a heat-cured acrylic resin (Acron Duo). Using the adhesion and crystal violet assays, 14 oral Candida albicans isolated from HIV-positive subjects and 2 references Candida strains (C. albicans ATCC 90028 and C. albicans ATCC 90128) were compared for their biofilm production and adhesion properties to acrylic surfaces in vitro. RESULTS: There were no significant differences in adhesion (P=.52) and biofilm formation assays (P=.42) by statistical analysis with Mann-Whitney test. CONCLUSION: Denture stomatitis and increased prevalence of candidal carriage in HIV infected patients is unlikely to be related to the biofilm formation and adhesion abilities of C. albicans to acrylic resin materials.
Biofilms ; Candida albicans* ; Candida* ; Gentian Violet ; HIV* ; Humans ; Polymethyl Methacrylate ; Prevalence ; Stomatitis, Denture

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Evaluation of different approaches for using a laser scanner in digitization of dental impressions.

Wan Sun LEE ; Woong Chul KIM ; Hae Young KIM ; Wook Tae KIM ; Ji Hwan KIM

The Journal of Advanced Prosthodontics.2014;6(1):22-29. doi:10.4047/jap.2014.6.1.22

PURPOSE: This study aimed to investigate the potential clinical application of digitized silicone rubber impressions by comparing the accuracy of zirconia 3-unit fixed partial dentures (FPDs) fabricated from 2 types of data (working model and impression) obtained from a laser scanner. MATERIALS AND METHODS: Ten working models and impressions were prepared with epoxy resin and vinyl polysiloxane, respectively. Based on the data obtained from the laser scanner (D-700; 3Shape A/S, Copenhagen, Denmark), a total of 20 zirconia frameworks were prepared using a dental CAD/CAM system (DentalDesigner; 3shape A/S, Copenhagen, Denmark / Ener-mill, Dentaim, Seoul, Korea). The silicone replicas were sectioned into four pieces to evaluate the framework fit. The replicas were imaged using a digital microscope, and the fit of the reference points (P1, P2, P3, P4, P5, P6, and P7) were measured using the program in the device. Measured discrepancies were divided into 5 categories of gaps (MG, CG, AWG, AOTG, OG). Data were analyzed with Student's t-test (alpha=0.05), repeated measures ANOVA and two-way ANOVA (alpha=0.05). RESULTS: The mean gap of the zirconia framework prepared from the working models presented a narrower discrepancy than the frameworks fabricated from the impression bodies. The mean of the total gap in premolars (P=.003) and molars (P=.002) exhibited a statistical difference between two groups. CONCLUSION: The mean gap dimensions of each category showed statistically significant difference. Nonetheless, the digitized impression bodies obtained with a laser scanner were applicable to clinical settings, considering the clinically acceptable marginal fit (120 microm).
Bicuspid ; Denmark ; Denture, Partial, Fixed ; Molar ; Seoul ; Silicone Elastomers ; Siloxanes

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Investigation of anodized titanium implants coated with triterpenoids extracted from black cohosh: an animal study.

In Phill PARK ; Tae Joo KANG ; Seong Joo HEO ; Jai Young KOAK ; Ju Han KIM ; Joo Hee LEE ; Shin Jae LEE ; Seong Kyun KIM

The Journal of Advanced Prosthodontics.2014;6(1):14-21. doi:10.4047/jap.2014.6.1.14

PURPOSE: The purpose of this study was to evaluate bone response to anodized titanium implants coated with the extract of black cohosh, Asarum Sieboldii, and pharbitis semen. MATERIALS AND METHODS: Forty anodized titanium implants were prepared as follows: group 1 was for control; group 2 were implants soaked in a solution containing triterpenoids extracted from black cohosh for 24 hours; group 3 were implants soaked in a solution containing extracts of black cohosh and Asarum Sieboldii for 24 hours; group 4 were implants soaked in a solution containing extracts of pharbitis semen for 24 hours. The implants from these groups were randomly and surgically implanted into the tibiae of ten rabbits. After 1, 2, and 4 weeks of healing, the nondecalcified ground sections were subjected to histological observation, and the percentage of bone-to-implant contact (BIC%) was calculated. RESULTS: All groups exhibited good bone healing with the bone tissue in direct contact with the surface of the implant. Group 2 (52.44 +/- 10.98, 25.54 +/- 5.56) showed a significantly greater BIC% compared to that of group 3 (45.34 +/- 5.00, 22.24 +/- 2.20) with respect to the four consecutive threads and total length, respectively. The BIC% of group 1 (25.22 +/- 6.00) was significantly greater than that of group 3 (22.24 +/- 2.20) only for total length. CONCLUSION: This study did not show any remarkable effects of the extract of black coshosh and the other natural products on osseointegration of anodized titanium implants as coating agents. Further studies about the application method of the natural products on to the surface of implants are required.
Animals* ; Asarum ; Biological Products ; Bone and Bones ; Cimicifuga* ; Methods ; Osseointegration ; Rabbits ; Semen ; Tibia ; Titanium*

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The level of buccal gingival margin around single and two adjacent implant restorations: a preliminary result.

Young Bum KIM ; June Sung SHIM ; Chong Hyun HAN ; Sun Jai KIM

The Journal of Advanced Prosthodontics.2009;1(3):140-144. doi:10.4047/jap.2009.1.3.140

STATEMENT OF PROBLEM: Little information is available about the buccal gingival level of multiple implant restorations. PURPOSE: This study was aimed to evaluate the relationship between width and height of buccal soft tissue around single and 2 adjacent implant restorations. MATERIAL AND METHODS: Four implant restoration groups (first and second molars, single second molars, posterior single restorations between teeth, and anterior single restorations between teeth) were randomly chosen from one dental institute. Each group comprised of 6 patients. After 6 months of function, silicone impressions were taken and stone models were fabricated for each restoration group. The stone models were cut in bucco-lingual direction at the most apical point of buccal gingival margin. The height and width of buccal supra-implant soft tissue were measured. One way ANOVA and Tukey HSD post hoc tests were performed to analyze the data obtained (P < .05). RESULTS: The most unfavorable width-height ratio was noted for the group, which was comprised of the second molar in the multiple adjacent (first and second molar) implant-supported restorations. The group also resulted in the shorter height of buccal supra-implant mucosa rather than that of anterior single implant restorations between natural teeth. CONCLUSION: To achieve a favorable level of buccal gingival margin, greater thickness of buccal supra-implant mucosa is required for the implant restorations without a neighboring natural tooth compared to the implant restorations next to a natural tooth.
Humans ; Molar ; Mucous Membrane ; Silicones ; Tooth

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