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Influencing factors on the final color of laminate veneer restorations with various IPS Empress Esthetic(R) ingots.

The Journal of Korean Academy of Prosthodontics.2011;49(4):308-315. doi:10.4047/jkap.2011.49.4.308

PURPOSE: The purpose of this study was to colorimetrically evaluate the masking effect of different opacity of ingots on the final shade of IPS Empress Esthetic(R) laminate veneer restorations using the CIE L*a*b* system. MATERIALS AND METHODS: Six porcelain disks of IPS Empress Esthetic(R) system (translucency: E 01, E 03, E 0C-1, E TC-1, E TC-2, E TC-3) were fabricated with 7 mm in diameter and 0.6 mm in thickness. Six extracted human incisors (shade: A1, A3, A4, B2, B3, C3) were used as the abutment specimens. The incisors were prepared using a diamond wheel and made with a flat labial surface on the middle 1/3. For each combination of different shades of abutments and copings, the change in color was measured with a colorimeter. CIE L*a*b* coordinates were recorded for each specimen. Color differences (DeltaE) were calculated. Descriptive statistical analysis was done. RESULTS: DeltaE values were significantly affected by coping translucency and abutment shade (P<.05). The color differences (DeltaE) of laminate veneers among abutments with A3, B3, C3, and A4 shade were mostly below 2.7 which was within the clinically acceptable range, while color differences between A4 and B2, A3 and B2, and A1 and A4 showed more than 2.7. CONCLUSION: The final color of IPS Empress Esthetic(R) laminate veneers were significantly influenced by translucency of the coping and shade of abutment teeth. The large value difference of abutment teeth limited the masking ability by laminate veneers.
Dental Porcelain ; Diamond ; Humans ; Incisor ; Masks ; Tooth

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The effect of PostGraft(TM) on implants were installed at the tibia of ovariectomized rats.

Chun Il CHO ; Se Won KIM ; Yu Sung CHOI ; In Ho CHO

The Journal of Korean Academy of Prosthodontics.2011;49(4):300-307. doi:10.4047/jkap.2011.49.4.300

PURPOSE: This study evaluated PostGraft(TM) which enhances implant stability and bone density. MATERIALS AND METHODS: Forty eight implants were installed at the tibia of ovariectomized rats. The group administrated with PostGraft(TM) was the experimental group, and the control group was not administrated. Implant stability was evaluated at the 2nd, 4th and 6th week by Periotest value, bone mineral density, bone-to-implant contact. These values were analyzed statistically with Mann-Whitney U test (P<.05). Histological analysis was evaluated at the 2nd, 4th and 6th week. RESULTS: According to the Periotest(R) measurement, both experimental and control groups showed decrease in values as time elapsed. Greater decrease was observed in the experimental group but there was no significant difference. By examining the radiographic images, both experimental and control groups showed tendency of increase in bone density. Greater increase was seen in the experimental group but there was no significant difference. According to the bone-to-implant contact measurement, both experimental and control groups showed increase in values as time elapsed. Greater increase was seen in the experimental group. At the 2nd and 4th week, there was no significant difference. But at the 6th week, there was significant difference (P<.05). By histological analysis, both experimental and control groups showed increase in bone formation as time elapsed. In addition, greater increase was seen in the experimental group. CONCLUSION: It could be concluded that the PostGraft(TM) medicated group showed better results in the bone density and osseointegration.
Animals ; Bone Density ; Osseointegration ; Osteogenesis ; Rats ; Tibia

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Structural equation modeling for association between patient satisfaction and quality of life after implant surgery.

Sun Young CHUNG ; Jin Hyun CHO ; Kyu Bok LEE ; Youn Hee CHOI ; Keun Bae SONG

The Journal of Korean Academy of Prosthodontics.2011;49(4):291-299. doi:10.4047/jkap.2011.49.4.291

PURPOSE: This study was designed to measure patient satisfaction and oral health-related quality of life and to assess an association between patients' satisfaction and oral health-related quality of life after implant surgery by using structural equation modeling. MATERIALS AND METHODS: A total of 257 participants who visited 6 dental clinics located in Daegu city for the purpose of implant treatment participated in this study. Six months after completion of implant surgery, the patients' satisfaction and oral health-related quality of life were surveyed. The effect of factors associated with patients' satisfaction such as functions and aesthetics, maintenance and cost on oral health-related quality of life after implant surgery was analyzed using AMOS 4.0. RESULTS: Oral health-related quality of life was improved in all dimensions of OHIP-14 after implant surgery. Functions and aesthetics as well as maintenance had a significant effect on oral health-related quality of life (P<.05), while cost was not a critical factor influencing oral health-related quality of life. CONCLUSION: High satisfaction with functional aspects and maintenance aspects significantly affected good quality of life. The result of this study supported the fact that education and management for patients after implant therapy were positively related to good quality of life based on a theoretical model.
Dental Clinics ; Esthetics ; Humans ; Models, Theoretical ; Patient Satisfaction ; Quality of Life

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Clinical evaluation of implant retained overdentures using two implant and Locator attachments in the fully edentulous mandibles.

Ju Hyoung LEE ; Dong Seok SOHN

The Journal of Korean Academy of Prosthodontics.2011;49(4):283-290. doi:10.4047/jkap.2011.49.4.283

PURPOSE: This study compared the marginal bone loss around dental implant that were placed in the canine areas of the mandibles and finded the survival rate of implants, marginal bone loss around implants and prosthetic complications in 10 patients treated with overdentures retained with Locator attachments. MATERIALS AND METHODS: Ten patients who had received implant retained overdentures in the mandibules using two implants and Locator attachments at Daegu Catholic University Medical Center from 2004 to 2010 were included in this study. Evaluations of the survival rate of implants, marginal bone loss and prosthetic complications were performed. RESULTS: Implants placed in this study showed a 100% survival rate and the average annual bone loss was 1.03 mm +/- 0.20 mm in the first year. The patients have verbally indicated that they are comfortable and that their overdentures function well. But, implant retained overdentures had various prosthetic complications such as male change, relining, rebasing and denture fracture. CONCLUSION: Implant retained overdentures using two implant and Locator attachments in the fully edentulous mandibles is considered as a stable way for long terms because of minimal invasive operation, simple prosthetic process and easy repair.
Academic Medical Centers ; Dental Implants ; Denture, Overlay ; Dentures ; Humans ; Male ; Mandible ; Survival Rate

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ADHESION OF CANDIDA ALBICANS ISOLATES TO ACRYLIC RESIN IN RELATION TO SALIVARY GLYCOPROTEINS IN DENTURE STOMATITIS PATIENTS.

Jung Hwan OH ; Boo Byung CHOI ; Dae Gyun CHOI ; Yi Hyung WOO ; Sung Bok LEE ; Kung Rock KWON

The Journal of Korean Academy of Prosthodontics.1999;37(5):698-713.

Adherence of Candida albicans(C. albicans) to the surface of a denture is believed to be an initial and essential step in the formation of denture-induced stomatitis. Previous studies have provided enormous infomation on the relationship between composition of palatine gland/parotid saliva and upper denture stomatitis. Relatively little information is available on the correlation between lower denture stomatitis and sublingual-submandibular(SLSM) saliva. The plaque samples were collected from the two sites(100mm2) on the inner surface of lower partial denture corresponding to the stomatitis and healthy region of the lower partial dentures of 12 denture stomatitis patients and 6 normal persons who wore lower partial dentures. The samples were plated to isolate C. albicans on a selective Saboraud's dextrose agar plate and the isolates were identified by germ tube test and gram staining. The subjects were divided into group I (stomatitis with C. albican), group II (lesion without C. albicans), group III (no lesion but C. albicans), and group IV (normal and healthy denture wearer). Individual SLSM saliva (20microgram of protein) was analyzed by SDS-PAGE(SDS-poly-acrylamide gel electrophoresis) with Coomassie brilliant blue and PAS(Periodic Acid Schiff) staining. The salivary proteins separated in the polyacryamide gels were subjected to immunoblot analysis using anti-lactoferrin, anti-sIgA, and anti-secretory component of sIgA. In this study using custom made acrylic denture resin beads(5mm in diameter) coated with stimulated individual SLSM saliva, the binding ability of individual C. albicans strains to the beads was observed. Levels of C. albicans adhered to the acrylic resin beads were determined by measuring the optical density of the bound C. albicans to the beads at 580nm. The results showed that a higher number of C. albicans was observed in the lesion site than health site. The saliva of group I contained more high molecular weight glycoprotein(mucin, MG1) as compared to group II, III, and IV. And lactoferrin and sIgA affected to the binding ability of C. albicans to acylic resin beads. Binding ability of individual C. albicans to the acrylic resin coated with respective individual saliva was found to be greater in group I than the other 3 groups. And when bound cells of C. albicans isolated from individual subject #2 to the saliva coated beads were used, binding ability of subject #2 saliva coated beads was founed to be greater than the other subjects. These results suggested that denture induced stomatitis is related to individual patient's salivary protein composition, especially MG-1. Future studies will be directed toward saliva examination of patients who have general disease and analysis of pellicles formed on prosthesis with respect to oral disease.
Agar ; Candida albicans* ; Candida* ; Denture, Partial ; Dentures* ; Gels ; Glucose ; Glycoproteins* ; Humans ; Immunoglobulin A, Secretory ; Lactoferrin ; Molecular Weight ; Prostheses and Implants ; Saliva ; Salivary Proteins and Peptides ; Stomatitis ; Stomatitis, Denture*

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EFFECTS OF BONE ENGAGEMENT TYPE&IMPLANT LENGTH ON STRESS DISTRIBUTION: A THREE DIMENSIONAL FINITE ELEMENT ANALYSIS.

Jeong Hwa CHOI ; Jung Suk HAN ; Ki Youl SEO ; Joo Ho CHOI

The Journal of Korean Academy of Prosthodontics.1999;37(5):687-697.

A finite element analysis has been utilized to analyze stress and strain fields and design a new configuration in orthopedics and implant dentistry. Load transfer and stress analysis at implant bone interface are important factors from treatment planning to long term success. Bone configuration and quality are different according to anatomy of expecting implantation site. The purpose of this study was to compare the stress distribution in maxilla and mandible according to implant length and bone engagement types. A three dimensional axi-symmetric implant model(Nobel Biocare, Gothenburg, Sweden) with surrounding cortical and cancellous bone were designed to analyzed the effects of bone engagement and implant length on stress distribution ANSYS 5.5 finite element program was utilized as an interpreting tool. Three cases of unicortical anchorage model with 7, 10, 13mm length and four cases of bicortical anchorage model with 5, 7, 10 and 13mm lenght were compared both maxillary and mandibular single implant situatiion. Within the limits of study, following conclusions were drawn. 1. There is difference in stress distribution according to cortical and cancellous bone thickness and shape. 2. Maximum stress was shown at the top of cortical bone area regardless of bone engagement types. 3. Bicortical engagement showed less stress accumulation when compared to unicortical case overall. 4. Longer the implant fixture length, less the stress on cortical bone area, however there is no difference in mandibular bicortical engagement case.
Dentistry ; Finite Element Analysis* ; Mandible ; Maxilla ; Orthopedics

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A STUDY OF INTERFACE AND CORROSION BEHAVIOR BETWEEN IMPLANT ABUTMENT AND CASTING GOLD ALLOY.

Mee Kyoung SON ; Jang Seon MA ; Chae Heon CHUNG

The Journal of Korean Academy of Prosthodontics.1999;37(5):672-686.

The purpose of this study was to compare the casting problem and corrosion behavior in two types of HL Hexed abutments of the Steri-Oss system : gold/plastic coping and gold coping. The anodic Polarization behavior, the galvanic corrosion between abutments and Type III gold alloys, before and after casting were analyzed, and the crevice corrosion of casting samples was analyzed with the CPPT test and the SEM. The results are as follows ; 1. Anodic polarization behavior of samples ; Before casting, gold/plastic coping and gold coping was shown to have a similar corrosion patterns. TypeIII casting gold alloy was shown to have a lower corrosion potential and passivation film. Corrosion potential of the case of gold/plastic coping after casting was higher than that of gold coping, but the region of passivation film for gold/plastic coping was smaller than that of gold coping. 2. Galvanic corrosion behavior of samples ; Contact current density between casting gold alloys and gold/plastic before casting was higher than that between gold coping and casting gold alloy. Galvanic corrosion of samples after casting was shown to have similar contact current density. 3. Crevice corrosion behavior of samples ; Crevice corrosion resistance of casting sample using gold coping was lower than that of casting sample using gold/plastic coping, and a severe corrosion pattern was observed at the abutment-casting gold alloy interface by the SEM.
Alloys* ; Corrosion* ; Gold Alloys

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THE EFFECT OF SURFACE TREATMENT ON FRACTURE STRENGTH OF DENTAL CERAMICS.

Shin Won LEE ; Sun Hyung LEE ; Jae Ho YANG ; Hun Young CHUNG

The Journal of Korean Academy of Prosthodontics.1999;37(5):658-671.

The major influencing factors on the strength of all-ceramic crowns are types of dental ceramics, fabrication techniques, methods of abutment preparation and cementation modes of all ceramic restorations. Zine phosphate cement and glass-ionomer cement were used as an early luting media for all-ceramic crowns. Recently many studies have reported that resin cements have more advantages in increasing the fracture strength of restorations comparing with zincphosphate cement and glass-ionomer cement. The purpose of this study is to investigate the effect of etching, silane treatment, sandblasting and dentin bonding agents on fracture strengths of dental ceramics. 40 flat dentin specimens and 40 ceramic discs of 1.5mm thickness and 8mm diameter were fabricated, and divided into 4 groups according to surface treatments. Surface treatments before cementation were as follows. Group I : (ceramic) : HF etching - silane treatment - application of bonding resin (dentin) : application of dentin bonding agent Group II : (ceramic) : sandblasting - application of bonding resin (dentin) : application of dentin bonding agent Group III : (ceramic) : application of bonding resin (dentin) : application of dentin bonding agent Group IV : (ceramic) : HF etching - silane treatment - application of bonding resin (dentin) : no dentin bonding procedure Dentin specimens and ceramic discs were cemented with dual cure resin cement, and went through thermocycling. Compressive stress es were loaded on the centers of ceramic discs with Instron testing machine, and fracture strengths resista' nce for catastrophic fracture were measured The results were as follows. 1. The group I showed the highest fracture resistance. The next was group II. And group III, IV followed. 2. There was a significant difference in the mean value of fracture strengths between group I and group III (p<0.05), but no significant differences between group I and group II, and group II and group III (p>0.05). 3. There was a significant difference in the mean value of fracture strengths between group I and group IV (p<0.05).
Cementation ; Ceramics* ; Crowns ; Dentin ; Dentin-Bonding Agents ; Glass Ionomer Cements ; Resin Cements

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THE RETRIEVABILITY OF CEMENTATION TYPE IMPLANT ABUTMENT BY SURFACE TREATMENTS AND TYPES OF CEMENTS.

Jai Bong LEE

The Journal of Korean Academy of Prosthodontics.1999;37(5):651-657.

This study was performed to investigate the retrievability of the cementation type implant abutments. The cements used in this study were Cavitec, Tembond and Zine Phosphate Cement. The types of surface conditioning were no treatment, 50 microne sandblasting, 250 microne sandblasting, fine diamond finishing point and coarse diamond point. The retention of cast crown was measured with Instron University Testing Machine(Instron Engineering Co., U.S.A.) The results were as follows: 1. The Maximium retention was obtained by the group of Z.P.C. cementation and Coarse diamond point surface conditioning. 2. Z.P.C. shows maximum retention, and reduced in orders Tembond, Cavitec, No cement. 3. The value of retention of surface condition was highest in coarse diamond point, lowest in no tretment. 4. The similar results were obtained between fine diamond point and 50 microne sandblasting, coarse diamond point and 250 microne sandblasting. 5. The were no direct corelation between mechanical retetnion and cementation retention.
Cementation* ; Crowns ; Diamond

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A STUDY ON THE PHYSICAL CHARACTERISTICS OF THE THREE COMMONLY USED DIE SPACING MATERIALS.

Hong Seok MOON ; Jong Jin KIM

The Journal of Korean Academy of Prosthodontics.1999;37(5):640-650.

As an optimal quality of the restorations, there should be a least amount of seating discrepancy between the casting and abutment teeth. However, high viscosity of the cementing medium and its resulting thickness ay prevent complete seating of the restoration. The use of die spacing material provides adequate internal relief for the cementing medium. The purpose of this study is to compare the thickness of three commonly used die spacing materials. Materials and Methods : Stone plates were fabricated and divided into 12 sections to be painted with die spacers. Tru-Fit, Whip-Mix and Belle de St. Claire die spacer which are commonly used in dental practice were tested in this study. Each die spacers were painted layer by layer according to the manufacturer's recommendation. The average thickness of each die spacers were measured with light microscope(x100) and compared between them. Results and Conclusions: A silver-colored Tru-Fit die spacer has the lowest value of thickness without statistical significance comparing with a gold-colored Tru-Fit die spacer and a gray layer of Whip-Mix die spacer has the highest value of thickness without any statistical significance comparing with Belle de St. Claire die spacer. Three and four layers of Tru-Fit die spacer and two layers of Whip-Mix and Belle de St. Claire die spacers seem to be in the acceptable range of thickness of 25 to 45micrometer for optimal seating of the restorations. The standard experimental design and method should be further evaluated for more consistent and objective results.
Paint ; Research Design ; Tooth ; Viscosity

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