• 대한치과보철학회지
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• 제26권1호
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• pp.197-206
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• 1988

The purpose of this study was to investigate the effect of wearing the removable partial denture on plaque accumulation. Twelve removable partial denture cases were examined. Patients were recalled three consecutive 3 day periods. Plaque index was measured after each 3 day period. (1) not wearing the denture, (2) wearing the denture, (3) wearing the denture after intensive tooth brushing instruction. The results were as follows: 1. Plaque indices of all the remaining teeth were higher following the wearing of removable partial denture than those of teeth not wearing the denture and those of teeth after intensive tooth brushing instruction. 2. Plaque indices showed statistical difference between all the tooth surfaces which were in contact with the denture and those which were not. 3. Plaque indices showed no statistical difference between buccal and lingual surfaces which were in contact with the denture and those which were not. 4. Plaque indices showed statistical difference between proximal surfaces which were in contact with the denture and those which were not.

• Restorative Dentistry and Endodontics
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• 제6권1호
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• pp.141-147
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• 1980

The sealing effect of a few cavity liners upon the dentinal tubule were studied in vitro. The materials employed in this study were Silcot (SP$\'{E}$CIALIT$\'{E}$S SEPTODONT, M.-T. GENDRAULT, Pharmacien), Hypo-Cal(Ellman Dental Mfg.Co.Inc.), Cavity Lining(De Trey), and Copaute(Harry J. Bosworth Co.). Freshly extracted human teeth were devided into 5 groups by age-under twenty, twenties, thirties, forties, and over fifty. Class V cavities were prepared routinely. The cavity walls of eight teeth of each group were lined by Silcot, Copalite, Cavity Lining, and Hypo-Cal. Remaining eight were not lined as a control. These specimens were immersed in dye solution (2 gm eosin Y to 800 cc distilled water) for 48 hours to allow maximum dye penetration into dentinal tubules. Each specimen was sectioned longitudinally including Class V cavity floor under water spray. Dye penetration into dentinal tubules were examined and following results were obtained. 1. Liners used on this study showed more or less dye penetration into dentinal tubules. But compared with the teeth without lining, the dye penetration of lined specimens were decreased. 2. Of these liners tested, Silcot was the most effective sealer upon the dentinal tubules. Copalite was the moderate sealer and Cavity Lining showed a tendency similar to Copalite. Hypo-Cal revealed the greatest dye penetration. 3. As the age was increased, the more the dye penetration into the dentinal tubules was decreased.

• 한국치위생학회지
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• 제22권5호
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• pp.417-424
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• 2022

Objectives: This study aimed to find a way to solve oral health inequality in old age by understanding the effect of the socioeconomic level of the elderly on oral health. Methods: We used data from the 7th Korea National Health and Nutrition Examination Survey. A chi-square test was performed to investigate differences in oral health according to socioeconomic status and demographic and oral health-related factors. Socioeconomic status and oral health inequality were analyzed using multiple logistic regression. Results: The average number of teeth in the elderly was 17.20, which is insufficient for the minimum number of teeth required for mastication. In the analysis of the correlation between socioeconomic status and oral health inequality, education level, income level, and home ownership were factors influencing the oral health of the elderly; education level was found to have the strongest effect. Conclusions: Oral health inequality according to socioeconomic status was confirmed, and it is necessary to measure the level of oral health inequality with active efforts at the government level to resolve the gap in oral health by social class.

• 대한치과교정학회지
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• 제43권2호
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• pp.96-100
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• 2013

Objective: To evaluate the effects of contamination by either blood or a hemostatic agent on the shear bond strength (SBS) of orthodontic buttons. Methods: We used 45 freshly extracted, non-carious, impacted third molars that were divided into 3 groups of 15. Each tooth was etched with 37% phosphoric acid gel for 30 s. Human blood or the blood stopper agent was applied to the tooth surface in groups I and II, respectively. Group III teeth were untreated (controls). Orthodontic buttons were bonded to the teeth using light-curing composite resin. After bonding, the SBS of the button was determined using a Universal testing machine. Any adhesive remaining after debonding was assessed and scored according to the modified adhesive remnant index (ARI). ANOVA with post-hoc Tukey's test was used to determine significant differences in SBS and Fisher's exact test, to determine significant differences in ARI scores among groups. Results: ANOVA indicated a significant difference between groups (p < 0.001). The highest SBS values were measured in group III ($10.73{\pm}0.96$ MPa). The SBS values for teeth in groups I and II were significantly lower than that of group III (p < 0.001). The lowest SBS values were observed in group I teeth ($4.17{\pm}1.11$ MPa) (p < 0.001). Conclusions: Contamination of tooth surfaces with either blood or hemostatic agent significantly decreased the SBS of orthodontic buttons. When the contamination risk is high, it is recommended to use the blood stopper agent when bonding orthodontic buttons on impacted teeth.

• Restorative Dentistry and Endodontics
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• 제39권2호
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• pp.95-103
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• 2014

Objectives: This study evaluated the effect of three antioxidizing agents on pullout bond strengths of dentin treated with sodium hypochlorite. Materials and Methods: Root canals of 75 single-rooted human teeth were prepared. Fifteen teeth were irrigated with normal saline for a negative control group, and the remaining 60 teeth (groups 2 - 5) with 2.5% NaOCl. The teeth in group 2 served as a positive control. Prior to post cementation, the root canals in groups 3 - 5 were irrigated with three antioxidizing agents including 10% rosmarinic acid (RA, Baridge essence), 10% hesperidin (HPN, Sigma), and 10% sodium ascorbate hydrogel (SA, AppliChem). Seventy-five spreaders (#55, taper .02, Produits Dentaires S.A) were coated with silica and silanized with the Rocatec system and ceramic bond. All the prepared spreaders were cemented with a self-adhesive resin cement (Bifix SE, Voco Gmbh) in the prepared canals. After storage in distilled water (24 h/$37^{\circ}C$), the spreaders were pulled out in a universal testing machine at a crosshead speed of 1.0 mm/min. Pull-out strength values were analyzed by one-way ANOVA and Tukey's HSD test (${\alpha}$ = 0.05). Results: There were significant differences between study groups (p = 0.016). The highest pullout strength was related to the SA group. The lowest strength was obtained in the positive control group. Conclusions: Irrigation with NaOCl during canal preparation decreased bond strength of resin cement to root dentin. Amongst the antioxidants tested, SA had superior results in reversing the diminishing effect of NaOCl irrigation on the bond strength to root dentin.

• Imaging Science in Dentistry
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• 제50권2호
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• pp.141-151
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• 2020

Purpose: This study aimed to quantify the influence of tooth position within the field-of-view (FOV) on cone-beam computed tomography (CBCT) imaging artifacts' intensity when assessing teeth restored with various intracanal materials. Materials and Methods: Seventy single-rooted teeth were divided into 7 groups (10 teeth per group): NiCr post (NC), AgPd post (AP), metal core fiberglass post (MCFG), fiberglass post (FG), anatomical fiberglass post (AFG), fiberglass post cemented with core build-up cement (FGCo), and anatomical fiberglass post cemented with core build-up cement (AFGCo). All posts were cemented using a regular dual-curing resin cement (Allcem), except FGCo and AFGCo which were cemented with a core build-up dual-curing resin cement (AllcemCore). Each tooth was scanned on a CS9000 in 5 positions within the FOV: a central position, anterior horizontal peripheral, peripheral superior, peripheral inferior, and posterior horizontal peripheral position. Hyperdense, hypodense, remaining teeth areas and ROI areas were quantitatively analyzed using ImageJ software. Results: Posterior horizontal peripheral position increased the intensity of artifacts on FGCo and AFGCo post groups (P<0.05), and specifically the hypodense artifact intensity on FG and AFG post groups (P<0.05). NC and AP groups presented greater intensity of artifacts than any other post groups(P<0.05). Conclusion: Artifact intensity increases in the presence of high atomic number materials and when the object is not centered within the FOV. The impact of positioning within the FOV on artifact was greater for fiberglass posts cemented with core build-up dual-curing cement than for metal posts and fiberglass posts cemented with regular dual-curing cement.

• 한국치위생학회지
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• 제13권5호
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• pp.759-767
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• 2013

Objectives : The purpose of this study was to investigate the relationship between the oral health status of elderly people and their oral health-related quality of life. Methods : The subjects were the elderly people over 65 years old in Busan. A total of 479 elderly people participated in the study from general hospital, two research institutes, eight dental clinics, six welfare institutions, sixteen senior centers, and three nursing homes. The oral health impact profile-14 (OHIP-14) was used in the routine dental checkups of the elderly people. Results : Those who had no oral symptoms had a better oral health-related quality of life. Among the subfactors of the OHIP-14, significant differences were shown in functional limitation(p=0.001), physical pain(p<0.001), emotional discomfort(p<0.001), physical disability(p=0.001), emotional disability (p=0.001), social disability(p=0.005), physical handicap(p=0.003) and total OHIP-14(p<0.001). Those who had 18 sound teeth(natural teeth) or more had a better oral health-related quality of life. Among the subfactors of the OHIP-14, significant differences were shown in functional limitation(p<0.001), physical pain(p=0.007), emotional discomfort(p=0.019), physical disability(p=0.018), Emotional disability(p=.032) and total OHIP-14 (p=0.006). Conclusions : The results revealed a close relationship between oral health status and oral health-related quality of life. The number of sound teeth(natural teeth) and frequency of toothbrushing had a more positive influence. Therefore oral health programs for the elderly people can preserve remaining teeth. Toothbrushing is the best way to improve the quality of life in the elderly people.

• Restorative Dentistry and Endodontics
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• 제20권2호
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• pp.732-743
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• 1995

The purpose of this study was to evaluate the adaptation of light cured dentin bonding agents to tooth structure by measuring contraction gaps on interfaces between cavity wall and composite resin under SEM study. In this study, class V cavities with cementum margin were prepared on the buccal surfaces of 15 extracted human premolar teeth and teeth were randomly assigned 3 groups of 5 teeth each. The cavities were filled with three dentin bonding agents and two composite resins were investigated for this study: three dentin bonding agents; Scotchbond 2, Scotchbond Multi-Purpose. All-Bond 2, two composite resins; Silux Pius, Z-100. Group 1 : Scotchbond 2 + Silux Plus Group 2 : Scotchbond Multi~Purpose + Z-100 Group 3 : All-Bond 2 + Z-100 The restored teeth were stored in 100% relative humidity at $37^{\circ}C$ for 7 days. And then, the roots of the teeth were removed with the tapered fissure bur and the remaining crowns were sectioned occlusogingivally through the center of restorations. Adaptation at tooth-restoration interface was assesed occlusally, gingivally, and axially by scanning electron microscope. The results were as follows : 1. In Group 1, the adaptation to dentinal wall of Scotchbond 2 was poor, but the adaptation to enamel wall of Scotchbond 2 was excellent. 2. In Group 2, the adaptation to occlusal was axial wall and gingival wall of Scotchbond Multi-Purpose was excellent. Especially in axially wall, the dentin bonding agents infiltrated into dentinal tubules and there was excellent adaptation to dentinal wall. 3. In Group 3, the adaptation to occlusal wall and axial wall of All-Bond 2 was excellent. But in gingival wall, there was gap formation between composite resin and dentin bonding agent.

• 구강회복응용과학지
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• 제40권2호
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• pp.82-90
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• 2024

치조제의 조직 변화, 의치 또는 지대치의 파절 등으로 인해 국소의치의 수리가 필요한 경우가 종종 발생한다. 기존 국소의치의 금속 구조물에 맞는 보철물을 제작하면 몇 가지 장점이 존재한다. 환자의 경제적 부담이 줄어들고, 새로운 의치를 제작하기 위해 여러 번 내원할 필요가 없다. 자연치아가 파절되어 의치를 수리할 때 사용되는 인공치는 자연치아와 유사한 형태를 갖기 어려우며, 심미적인 인공치 수리를 위해서는 환자 개개인의 치아 형태와 유사한 맞춤형 인공치 제작이 필요하다. 최근에는 CAD/CAM 기술을 이용한 기존 국소의치에 맞는 보철물을 제작하여 높은 유지력과 적합도를 확보할 수 있으며, 맞춤형 인공치아를 디자인하여 더욱 심미적이고 조화로운 의치 수리가 가능하다. 디지털 방식을 이용하여 기존 국소의치에 맞춤형 보철물과 인접치열을 미러링한 맞춤형 인공치를 제작하여 의치를 수리한 증례로 시간과 비용을 절약하고 과정을 단순화하면서 심미적, 기능적으로 만족스러운 결과를 얻었기에 이를 보고하는 바이다.

• Journal of Dental Anesthesia and Pain Medicine
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• 제19권3호
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• pp.167-173
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• 2019

This case report describes a frail, middle-aged woman with multiple comorbidities who was scheduled to undergo extraction of all remaining teeth in anticipation of cardiac quadruple valve intervention. Dental and anesthetic management of the patient are discussed. Medical care of the patient with a high burden of comorbidities requires a multidisciplinary approach even for a routine dental procedure.