Journal of Prosthetic Dentistry最新文献_第7页

Role of gender and age in influencing dentist perceptions of effective leadership capabilities 性别和年龄对牙医有效领导能力认知的影响。

IF 4.3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Prosthetic Dentistry

Pub Date : 2025-02-01 DOI: 10.1016/j.prosdent.2023.04.011

Elizabeth O. Carr RDH, DHA , Neil I. Park DMD , Jason A. Griggs PhD , Sreenivas Koka DDS, MS, PhD, MBA

Statement of the problem

The characteristics of effective leaders in dentistry are unknown, especially as they relate to the perceptions of attributes associated with emotional intelligence.

Purpose

The purpose of this study was to survey dentists about their perceptions of the relative importance of emotional intelligence domains in effective leadership and in effective leaders with whom they have worked and to determine whether the differences were based on gender and age.

Material and methods

A survey was sent to a list of over 50 000 dentists. The survey asked respondents to rate important qualities found in effective leaders in general and to identify important qualities found in the most effective leaders with whom they had worked or by whom they had been mentored. Additionally, demographic information such as the age and gender of the participants was captured in the survey. Descriptive statistics were created and statistical differences (α=.05) between genders were determined.

Results

A total of 256 respondents completed the survey. Self-management and relationship management were perceived to be more important than social awareness or self-awareness. Adaptability was the highest ranked personal competence skill, while conflict management was perceived as the least important personal competence skill. The social competence skills of empathy, organizational awareness, influence, and inspirational leadership were similarly ranked as highly important. When asked to identify the most important leadership skill of previous leaders, respondents noted that conflict management was most important and emotional self-awareness was least important. Women viewed the attributes of adaptability, organizational awareness, and conflict management as more important. Men viewed achievement orientation and coaching or mentoring as more important attributes of leaders. When answers were stratified for age group responses, younger respondents valued relationship management and adaptability, and whether their leader valued and exhibited conflict management more than older respondents. Older respondents were more likely to respond “yes” to valuing self-management and to whether their leader valued and exhibited inspirational leadership.

Conclusions

Different genders and different age groups view leadership skills in effective leaders differently. The results of this study indicate that women may need different leadership skills to lead colleagues of different ages.

问题陈述:有效的牙科领导者的特征是未知的，特别是当它们与情绪智力相关的属性的感知相关时。目的:本研究的目的是调查牙医对情商领域在有效领导和与他们共事的有效领导中的相对重要性的看法，并确定这种差异是否基于性别和年龄。材料和方法:对5万多名牙医进行了调查。该调查要求受访者对有效领导者的重要品质进行评分，并找出与他们共事或受其指导的最有效领导者的重要品质。此外，调查还收集了参与者的年龄和性别等人口统计信息。建立描述性统计，确定性别间的统计学差异(α= 0.05)。结果:共有256名受访者完成了调查。自我管理和关系管理被认为比社会意识或自我意识更重要。适应能力是排名最高的个人能力技能，而冲突管理被认为是最不重要的个人能力技能。同理心、组织意识、影响力和鼓舞性领导等社会能力技能同样被列为非常重要的技能。当被问及前任领导人最重要的领导技能时，受访者指出，冲突管理是最重要的，情感自我意识是最不重要的。女性认为适应能力、组织意识和冲突管理能力更重要。男性认为成就导向和指导或指导是领导者更重要的特质。当回答按年龄组分层时，年轻的受访者更重视关系管理和适应性，以及他们的领导是否比年长的受访者更重视和表现出冲突管理。年龄较大的受访者更有可能在重视自我管理和他们的领导是否重视并表现出鼓舞人心的领导方面回答“是”。结论:不同性别、不同年龄层对有效领导者领导技能的看法不同。本研究的结果表明，女性领导不同年龄的同事可能需要不同的领导技能。

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引用次数: 0

Influence of the ambient color lighting on the accuracy of complete arch implant scans recorded by using two intraoral scanners 环境色光对使用两台口内扫描仪记录的全牙弓种植体扫描精度的影响。

IF 4.3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Prosthetic Dentistry

Pub Date : 2025-02-01 DOI: 10.1016/j.prosdent.2024.03.030

Gastón Ochoa-López DDS, MSD , Marta Revilla-León DDS, MSD, PhD , Miguel Gómez-Polo DDS, PhD

Statement of problem

The influence of different ambient factors including lighting has been previously studied. However, the influence of ambient color lighting settings on intraoral scanning accuracy remains uncertain.

Purpose

The purpose of this in vitro study was to assess the influence of ambient color lighting on the accuracy of complete arch implant scans recorded by using 2 intraoral scanners (IOSs).

Material and methods

An edentulous maxillary cast with 6 implant scan bodies was digitized by using a laboratory scanner (DW-7–140) to obtain a reference file. Two groups were created based on the IOS tested: TRIOS 4 (IOS-1) and i700 (IOS-2). Seven subgroups were developed depending on the ambient color lighting (red, green, blue, yellow, cyan, magenta, and white) (n=15). Scanning accuracy was analyzed by using a metrology software program (Geomagic Control X). The Kruskal-Wallis, 1-way ANOVA, and pairwise comparisons were used to analyze the data (α=.05).

Results

Significant trueness and precision values were found across the groups (P<.05) and subgroups (P<.05). For IOS-1, blue ambient lighting obtained the best trueness (19.8 ±1.8 µm) (P<.05); in precision, white light (20.8 ±7.3 µm) and blue light (22.1 ±13.5) showed the best results (P<.05). For IOS-2, white light showed the best trueness (51.9 ±16.7 µm); the best precision was obtained under magenta (38.6 ±10.4 µm) and yellow light (52.6 ±24.0 µm) (P<.05).

Conclusions

The optimal ambient color lighting varied between the IOSs assessed. As the best condition for maximizing accuracy was not found, ambient color lighting must be individualized for the IOS system used.

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引用次数: 0

Effect of transcutaneous electrical nerve stimulation (TENS) on the electromyographic activity of human masticatory muscles in young people with normal occlusion 经皮神经电刺激（TENS）对咬合正常的年轻人咀嚼肌肌电活动的影响。

IF 4.3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Prosthetic Dentistry

Pub Date : 2025-02-01 DOI: 10.1016/j.prosdent.2024.03.022

Xingyu Wang MS , Hao Liu MS , Xiangting Zhang MS , Zhe Qu PhD , Jiaming Zhao PhD

Statement of problem

Transcutaneous electrical nerve stimulation (TENS) has been used in several clinical areas. However, the effect of TENS on the masticatory muscles of young individuals with normal occlusion remains unclear.

Purpose

The purpose of the study was to assess the effect of TENS on the surface electromyographic (sEMG) activity of masticatory muscles in a young population with normal occlusion.

Material and methods

Twenty residents (5 men and 15 women, mean 24.27 ±2.59 years) of Dalian Stomatological Hospital were enrolled as the study participants. A trained operator collected the required information from the participants. The experiment was divided into 3 stages: pre-TENS acquisition, TENS application, and post-TENS acquisition. The pre-TENS stage was performed using surface electromyography (sEMG) (Myotronics Inc) to acquire the potential values of masticatory muscles in the following 3 states 5 times each: resting, intercuspal occlusion (ICO), and maximum voluntary clench (clenching). The potential values of the anterior of temporalis (TA), the masseter (MM), the sternocleidomastoid (SCM), and the anterior digastric (DA) muscles were collected in the resting state, and TA and MM were collected in the ICO and clenching states. During the TENS application phase, a TENS Unit device (J5 Myomonitor) (J5) was used on each participant for 45 minutes. The post-TENS acquisition phase involved the same procedure as the pre-TENS phase. The experimental data were recorded, and the normality of each group was analyzed using the Shapiro-Wilk test in a statistical software program (IBM SPSS Statistics, v26.0). The paired-sample t test was used to compare the differences in the mean values of sEMG and the asymmetry index (As); the independent-sample t test was used to compare the activity index (Ac) and torque index (To) (α=.05).

Results

Significant differences were observed in the mean potential values of TA, MM, LSCM, and RDA before and after TENS in the resting state and RTA, LMM, and RMM before and after TENS in the clenching state (P<.05). Moreover, although As_DA values showed a significant difference (P=.027) before and after TENS in the resting state, the differences in As values for the other muscles in the resting state were statistically similar. Furthermore, in each state, the mean values of Ac and To after TENS showed no significant differences before and after TENS (P>.05).

Conclusions

The resting EMG values of the TA and MM differed significantly before and after TENS. After TENS, the resting EMG activity decreased, whereas the functional EMG activity tended to increase.

问题陈述：经皮神经电刺激（TENS）已被用于多个临床领域。目的：本研究旨在评估经皮神经电刺激对正常咬合的年轻人咀嚼肌表面肌电图（sEMG）活动的影响：研究对象为大连市口腔医院的 20 名住院患者（5 男 15 女，平均 24.27 ± 2.59 岁）。由经过培训的操作员收集参与者所需的信息。实验分为三个阶段：TENS 前采集、TENS 应用和 TENS 后采集。TENS前阶段使用表面肌电图（sEMG）（Myotronics Inc）采集咀嚼肌在以下3种状态下的电位值，每种状态采集5次：静止、咬合（ICO）和最大自主咬合（clenching）。在静息状态下采集颞肌前部（TA）、咬肌（MM）、胸锁乳突肌（SCM）和掘腹肌前部（DA）的电位值，在 ICO 和紧握状态下采集 TA 和 MM 的电位值。在 TENS 应用阶段，对每位受试者使用 TENS 装置（J5 Myomonitor）（J5）45 分钟。TENS后采集阶段的程序与TENS前阶段相同。实验数据被记录下来，并通过统计软件程序（IBM SPSS Statistics, v26.0）中的 Shapiro-Wilk 检验分析了各组的正态性。采用配对样本 t 检验比较 sEMG 平均值和不对称指数（As）的差异；采用独立样本 t 检验比较活动指数（Ac）和扭矩指数（To）的差异（α=.05）：在静息状态下，TENS前后TA、MM、LSCM和RDA的平均电位值有显著差异；在紧握状态下，TENS前后RTA、LMM和RMM的平均电位值有显著差异（静息状态下TENS前后PDA值有显著差异（P=.027），静息状态下其他肌肉的As值差异在统计学上相似）。此外，在每种状态下，TENS后的Ac和To的平均值在TENS前后无显著差异（P>.05）：结论：TENS前后，TA和MM的静息EMG值差异显著。结论：TENS前后，TA和MM的静息肌电活动有明显差异，TENS后，静息肌电活动减少，而功能性肌电活动呈上升趋势。

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引用次数: 0

Effect of machining method and margin design on the accuracy and margin quality of monolithic zirconia crowns 加工方法和边缘设计对整体氧化锆冠的精度和边缘质量的影响

IF 4.3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Prosthetic Dentistry

Pub Date : 2025-02-01 DOI: 10.1016/j.prosdent.2024.10.012

Yi Zhou DDS, MD , Wenjia Chen MDS , Han Zhu MDS , Xiaochen Liu DDS, MD , Haiping Yang DDS, MD , Fuming He DDS, MD

Statement of problem

The machining accuracy and marginal integrity of monolithic zirconia crowns with minimal invasive preparations may impact the long-term survival rate of tooth and periodontal health, but studies on the effect of machining method are lacking.

Purpose

The purpose of this in vitro study was to digitally evaluate the machining accuracy and margin quality of monolithic zirconia crowns fabricated using gel deposition and conventional soft milling processes by comparing 2 different margin types.

Material and methods

A total of 40 monolithic zirconia crowns were produced using gel deposition (Self-glazed Zirconia Group, SGG, n=20) and soft milling (Milled Zirconia Group, MG, n=20). Each group was further divided into 2 subgroups with different margin designs (chamfer and feather-edge). The trueness and fit of crowns were compared using root mean square (RMS) values. Furthermore, the margin quality was examined before and after final sintering with a scanning electron microscope (SEM). The Scheirer-Ray-Hare and 2-way ANOVA test analysis nonparametric and parametric data, respectively (α=.05).

Results

The trueness analysis revealed that SGG had significantly lower RMS values for both the cameo and intaglio areas compared with MG (P<.001). In addition, crowns with a feather-edge margin exhibited significantly lower marginal RMS values than those with a chamfer margin (P<.01) according to the fit assessment. Followed by milling processes, SGG exhibited a constantly homogeneous microstructure compared with MG. Marginal defects were detected in both groups except for the SGG with the chamfer margin.

Conclusions

SGG exhibited better accuracy associated with ductile-regime machining than MG, and SGG with chamfer margins displayed flaw-free margin areas. Moreover, the feather-edge margin showed improved marginal fit compared with the chamfer margin.

问题陈述：微创制备的整体氧化锆冠的加工精度和边缘完整性可能会影响牙齿的长期存活率和牙周健康，但缺乏有关加工方法影响的研究。目的：本体外研究的目的是通过比较2种不同的边缘类型，对使用凝胶沉积和传统软铣工艺制作的整体氧化锆冠的加工精度和边缘质量进行数字化评估：使用凝胶沉积法（自釉氧化锆组，SGG，n=20）和软铣法（铣削氧化锆组，MG，n=20）共制作了 40 个整体氧化锆冠。每组又分为两个边缘设计（倒角和羽状边缘）不同的亚组。使用均方根（RMS）值比较牙冠的真实度和密合度。此外，还使用扫描电子显微镜（SEM）检查了最终烧结前后的边缘质量。分别采用 Scheirer-Ray-Hare 和 2-way ANOVA 检验分析非参数数据和参数数据（α=.05）：真实度分析表明，与 MG 相比，SGG 在浮雕和凹雕区域的均方根值明显较低（PConclusions）：与 MG 相比，SGG 表现出更好的韧性机械加工精度，带有倒角边缘的 SGG 显示出无缺陷的边缘区域。此外，与倒角边缘相比，羽边边缘的边缘贴合度有所提高。

{"title":"Effect of machining method and margin design on the accuracy and margin quality of monolithic zirconia crowns","authors":"Yi Zhou DDS, MD , Wenjia Chen MDS , Han Zhu MDS , Xiaochen Liu DDS, MD , Haiping Yang DDS, MD , Fuming He DDS, MD","doi":"10.1016/j.prosdent.2024.10.012","DOIUrl":"10.1016/j.prosdent.2024.10.012","url":null,"abstract":"<div><h3>Statement of problem</h3><div>The machining accuracy and marginal integrity of monolithic zirconia crowns with minimal invasive preparations may impact the long-term survival rate of tooth and periodontal health, but studies on the effect of machining method are lacking.</div></div><div><h3>Purpose</h3><div>The purpose of this in vitro study was to digitally evaluate the machining accuracy and margin quality of monolithic zirconia crowns fabricated using gel deposition and conventional soft milling processes by comparing 2 different margin types.</div></div><div><h3>Material and methods</h3><div>A total of 40 monolithic zirconia crowns were produced using gel deposition (Self-glazed Zirconia Group, SGG, n=20) and soft milling (Milled Zirconia Group, MG, n=20). Each group was further divided into 2 subgroups with different margin designs (chamfer and feather-edge). The trueness and fit of crowns were compared using root mean square (RMS) values. Furthermore, the margin quality was examined before and after final sintering with a scanning electron microscope (SEM). The Scheirer-Ray-Hare and 2-way ANOVA test analysis nonparametric and parametric data, respectively (α=.05).</div></div><div><h3>Results</h3><div>The trueness analysis revealed that SGG had significantly lower RMS values for both the cameo and intaglio areas compared with MG (<em>P</em><.001). In addition, crowns with a feather-edge margin exhibited significantly lower marginal RMS values than those with a chamfer margin (<em>P</em><.01) according to the fit assessment. Followed by milling processes, SGG exhibited a constantly homogeneous microstructure compared with MG. Marginal defects were detected in both groups except for the SGG with the chamfer margin.</div></div><div><h3>Conclusions</h3><div>SGG exhibited better accuracy associated with ductile-regime machining than MG, and SGG with chamfer margins displayed flaw-free margin areas. Moreover, the feather-edge margin showed improved marginal fit compared with the chamfer margin.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"133 2","pages":"Pages 592.e1-592.e9"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142576332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enamel wear and fatigue resistance of 3D printed resin compared with lithium disilicate 与二硅酸锂相比，3D 打印树脂的珐琅质耐磨性和耐疲劳性。

IF 4.3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Prosthetic Dentistry

Pub Date : 2025-02-01 DOI: 10.1016/j.prosdent.2024.10.024

Pranit V. Bora BDS, MS , Nathaniel C. Lawson DMD, PhD , Daniel A. Givan DDS, PhD , Celin Arce DDS, MS , Howard Roberts DMD

Statement of problem

The effect of 3-dimensional (3D) printed crown materials with lower flexural strength but higher ductility than lithium disilicate on enamel wear and fatigue resistance is unknown.

Purpose

The purpose of this in vitro study was to compare the enamel wear and fatigue resistance of a 50% filled 3D printed crown material with lithium disilicate.

Material and methods

Disks of a 3D printed crown material (Ceramic Crown; SprintRay Inc) and lithium disilicate (IPS e.max CAD; Ivoclar AG) (n=8) were tested for wear in a custom Alabama wear testing device which applied a 20-N load and 2-mm horizontal slide. The test was run for 400 000 cycles at 1 Hz in a 33% glycerin solution. Cusps of extracted human molars were used as the antagonists. The volumetric wear of the restorative material and enamel antagonists were measured every 100 000 cycles using a profilometer. Worn specimens were examined with a scanning electron microscope. Human molars were prepared for occlusal onlay preparations, and 1.2-mm 3D printed (Ceramic Crown) or lithium disilicate (IPS e.max CAD) restorations (n=10) were bonded to the teeth with resin cement. Restorations were subjected to 2 million cycles of fatigue loading (50 N, 1 Hz) in water against a Ø7.8-mm steel ball. Restorations were monitored for cracks every 100 000 cycles with transillumination and every1 million cycles with microcomputed tomography (µCT). After fatigue, specimens were fractured in a load-to-failure test. Fractured specimens were examined with µCT. Statistical analyses were performed with 2-way mixed ANOVAs and a t test (α=.05).

Results

The wear and opposing enamel wear of lithium disilicate was greater than the 3D printed material at every interval of cycles tested (P<.001). None of the restorations showed signs of internal cracks up to 2 million cycles of fatigue. No statistical difference was found in the load-to-failure fracture load of the 3D printed (2574 ±303 N) or lithium disilicate (2396 ±277 N) restorations (P=.110).

Conclusions

For the conditions tested, the 3D printed crown material demonstrated less wear than lithium disilicate and created less opposing enamel wear. All the occlusal onlay restorations survived 2 million cycles of fatigue at a 50-N load without signs of cracks. These results provide some support for the use of these restorations at 1.2-mm occlusal thickness when bonded with a resin cement.

问题陈述：与二硅酸锂相比，三维（3D）打印牙冠材料的抗弯强度较低，但延展性较高，其对牙釉质磨损和抗疲劳性的影响尚不清楚。目的：本体外研究的目的是比较填充率为50%的3D打印牙冠材料与二硅酸锂的牙釉质磨损和抗疲劳性：3D打印牙冠材料（Ceramic Crown; SprintRay Inc）和二硅酸锂（IPS e.max CAD; Ivoclar AG）的牙盘（n=8）在定制的阿拉巴马磨损测试装置中进行磨损测试，该装置施加20-N的负载和2毫米的水平滑动。测试在 33% 的甘油溶液中以 1 Hz 的频率进行了 400 000 次循环。用拔出的人类臼齿的尖牙作为拮抗剂。使用轮廓仪每 100 000 次循环测量修复材料和釉质拮抗剂的体积磨损。磨损的试样用扫描电子显微镜进行检查。对人类臼齿进行咬合嵌体制备，并用树脂水泥将 1.2 毫米 3D 打印（Ceramic Crown）或二硅酸锂（IPS e.max CAD）修复体（n=10）粘结到牙齿上。修复体在水中对直径 7.8 毫米的钢球进行 200 万次疲劳加载（50 牛顿，1 赫兹）。每 10 万次循环使用透射光监测修复体是否出现裂纹，每 100 万次循环使用微计算机断层扫描（µCT）监测修复体是否出现裂纹。疲劳后，试样在加载至破坏试验中断裂。用 µCT 对断裂试样进行检查。统计分析采用双向混合方差分析和 t 检验（α=.05）：结果：在测试的每个周期间隔内，二硅酸锂的磨损和对立珐琅质磨损均大于 3D 打印材料（PC 结论：在测试条件下，3D 打印材料的磨损和对立珐琅质磨损均大于二硅酸锂：在测试条件下，3D 打印牙冠材料的磨损程度低于二硅酸锂，产生的对位釉磨损也较少。所有咬合嵌体修复体在 50 N 负载下都经受住了 200 万次疲劳循环，没有出现裂纹。这些结果为使用树脂粘结剂粘结 1.2 毫米咬合厚度的这些修复体提供了一些支持。

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引用次数: 0

Fracture resistance, 3-dimensional finite element analysis, and safety factors for five post-and-core restorations with crowns placed in the noncircular-shaped canals of premolars 前磨牙非圆形根管内冠桩核修复体的抗折性、三维有限元分析及安全系数。

IF 4.3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Prosthetic Dentistry

Pub Date : 2025-02-01 DOI: 10.1016/j.prosdent.2024.11.001

Top Chitkraisorn DDS , Kunyawan Thaungwilai MS , Boonsong Prateepsawangwong DDS, MS , Pairod Singhatanadgid PhD , Terawat Tosiriwatanapong DDS, CAGS, DScD

Statement of problem

Restoring endodontically treated premolars with noncircular canals presents a significant challenge.

Purpose

The purpose of this study was to compare the in vitro fracture resistance and the finite element computational calculation-based stress and safety factor of noncircular-shaped, endodontically treated premolars restored with 5 different prefabricated and custom computer-aided design and computer-aided manufactured post-and-core systems.

Material and methods

Fifty single-rooted oval-shaped canal maxillary premolars were endodontically treated and post spaces were prepared. The specimens were divided into 5 categories on the basis of the post-and-core system used: Group CN composite resin core without a post, Group CF prefabricated fiber-reinforced composite resin post and composite resin core, Group IC interpenetrating phase composite post-and-core, Group LS lithium disilicate post-and-core, and Group ZR zirconia post-and-core. Lithium disilicate crowns were fabricated and cemented on the 5 different post-and-core systems and subjected to a fracture resistance test using a spherical indenter with static loading. Differences in fracture resistance were evaluated using a 1-way analysis of variance (ANOVA) (α=.05). The 3-dimensional finite element method was used to determine the von Mises stress and safety factors, defined as the ratio of the material's strength to the von Mises stress experienced, within different compartments of the restored tooth model.

Results

In the in vitro fracture resistance test, the mean ±standard deviation fracture loads of the 5 groups were 2144 ±515 N, 1801 ±600 N, 1690 ±312 N, 1612 ±545 N, and 1487 ±600 N, respectively and were statistically similar (P=.078). All specimens within the ZR group exhibited restorable fractures. In contrast, only 30% of the CN group specimens showed restorable fractures. The incidence of restorable fractures in the CF, IC, and LS groups was 70%, 80%, and 70%, respectively. Although all groups showed similar maximum von Mises stress and stress distribution, safety factors in the models varied significantly. The ceramic crown was the weakest component in the LS and ZR groups, with much lower safety factors than dentin and post-and-core regions. Additionally, the CN group's wider dentin area had a demonstrably lower safety factor.

Conclusions

Endodontically treated noncircular-shaped canal premolars showed minimal effect on fracture resistance regardless of post type. However, for teeth with sufficient ferrule, using any post-and-core system significantly reduced the incidence of nonrestorable fractures compared with just a coronal foundation restoration, with custom zirconia offering the potential of achieving a restorable outcome after fracture.

问题陈述：用根管治疗的非圆管前磨牙的修复是一个重大的挑战。目的：比较5种不同的预制和定制计算机辅助设计及计算机辅助制造桩核系统修复的非圆形、经根管治疗的前磨牙的体外抗骨折性及有限元计算的应力和安全系数。材料与方法：对50颗单根椭圆形管状上颌前磨牙进行根管治疗，并准备后位。根据柱核体系的不同，将试样分为5类：CN组复合树脂芯不带桩、CF组预制纤维增强复合树脂桩和复合树脂芯、IC组互穿相复合桩核、LS组二硅酸锂桩核、ZR组氧化锆桩核。制作二硅酸锂冠并将其粘合在5种不同的桩芯系统上，并使用静态负载的球形压头进行抗断裂测试。采用单因素方差分析（ANOVA）评估抗骨折性差异（α= 0.05）。采用三维有限元法确定修复牙模型不同隔室内的von Mises应力和安全系数（定义为材料强度与所经历的von Mises应力之比）。结果：在体外抗骨折试验中，5组小鼠骨折载荷的平均值±标准差分别为2144±515 N、1801±600 N、1690±312 N、1612±545 N、1487±600 N，差异有统计学意义（P= 0.078）。ZR组所有标本均表现为可恢复性骨折。相比之下，CN组只有30%的标本显示可恢复骨折。CF组、IC组和LS组的可恢复性骨折发生率分别为70%、80%和70%。虽然各组的最大von Mises应力和应力分布相似，但各模型的安全系数差异显著。在LS组和ZR组中，陶瓷冠是最弱的部件，其安全系数远低于牙本质和桩核区域。此外，CN组牙本质面积较宽，其安全系数明显较低。结论：采用根管治疗的非圆形根管前磨牙，无论柱型如何，对其抗骨折性的影响都很小。然而，对于有足够卡箍的牙齿，使用任何桩核系统与冠状基础修复相比，显著降低了不可恢复性骨折的发生率，定制的氧化锆提供了骨折后实现可恢复性结果的潜力。

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引用次数: 0

JPD Digital progress report

IF 4.3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Prosthetic Dentistry

Pub Date : 2025-02-01 DOI: 10.1016/j.prosdent.2025.01.004

Jonathan L. Ferencz DDS

引用次数: 0

Osseointegration in relation to drilling speed in the preparation of dental implants sites: A systematic review 骨整合与牙种植体位置准备中钻孔速度的关系:一项系统综述。

IF 4.3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Prosthetic Dentistry

Pub Date : 2025-02-01 DOI: 10.1016/j.prosdent.2023.03.004

Cícero Andrade Sigilião Celles DDS , Izabela Ferreira DDS , Mariana da Lima da Costa Valente PhD , Andréa Cândido dos Reis PhD

Statement of problem

The drilling speed used for preparing dental implants may affect bone-implant contact (BIC), implant stability quotient (ISQ), and bone area fraction occupancy (BAFO). Different rotational speeds and the presence or absence of irrigation during site preparation have been investigated, but an established protocol for achieving the best osseointegration results is lacking.

Purpose

The purpose of this systematic review was to investigate the influence of drill rotational speed on bone drilling for dental implant placement and its relationship with osseointegration.

Material and methods

This review included the preferred reporting items for systematic reviews and meta-analyses (PRISMA) and was registered in the international prospective register of systematic reviews (PROSPERO) database. Electronic searches were performed in the MEDLINE (PubMed), Scopus, Science Direct, and Embase databases. The risk of bias was analyzed by using the systematic review center for laboratory animal experimentation (SYRCLE).

Results

A total of 1282 articles were found, and after removing duplicates and applying the eligibility criteria to in vivo articles on animals that addressed drilling speed and its relationship to osseointegration, 8 articles were selected for analysis. Of these, 5 articles showed no statistical differences, and 3 others showed significantly better osseointegration results by analyzing the parameters of BIC, BAFO, ISQs, and pull-out forces (PoFs). In all selected articles, high-speed drilling was performed with irrigation.

Conclusions

Although drilling speed seems to affect bone perforation, no definitive protocol was found in the literature consulted. The results vary depending on the combination of different factors, including bone type, irrigation, and drilling speed.

问题陈述:用于制备牙种植体的钻孔速度可能会影响骨-种植体接触(BIC)，种植体稳定商(ISQ)和骨面积分数占用(BAFO)。已经研究了不同的旋转速度和在场地准备过程中是否进行灌溉，但缺乏实现最佳骨整合结果的既定方案。目的:本系统综述的目的是探讨牙种植体植入中钻头转速对骨钻孔的影响及其与骨整合的关系。材料和方法:本综述纳入了系统评价和荟萃分析的首选报告项目(PRISMA)，并在国际前瞻性系统评价注册(PROSPERO)数据库中注册。在MEDLINE (PubMed)、Scopus、Science Direct和Embase数据库中进行电子检索。通过实验动物实验系统评价中心(sycle)进行偏倚风险分析。结果:共找到1282篇文章，在去除重复并将合格标准应用于研究钻孔速度及其与骨整合关系的动物体内文章后，选择了8篇文章进行分析。其中，5篇文献无统计学差异，3篇文献通过分析BIC、BAFO、ISQs、拔牙力(pof)等参数显示骨整合效果明显改善。在所有选定的文章中，高速钻孔与灌溉一起进行。结论:虽然钻孔速度似乎影响骨穿孔，但在查阅的文献中没有找到明确的方案。结果取决于不同因素的组合，包括骨类型、灌溉和钻孔速度。

{"title":"Osseointegration in relation to drilling speed in the preparation of dental implants sites: A systematic review","authors":"Cícero Andrade Sigilião Celles DDS , Izabela Ferreira DDS , Mariana da Lima da Costa Valente PhD , Andréa Cândido dos Reis PhD","doi":"10.1016/j.prosdent.2023.03.004","DOIUrl":"10.1016/j.prosdent.2023.03.004","url":null,"abstract":"<div><h3>Statement of problem</h3><div>The drilling speed used for preparing dental implants<span> may affect bone-implant contact (BIC), implant stability quotient (ISQ), and bone area fraction occupancy (BAFO). Different rotational speeds and the presence or absence of irrigation during site preparation have been investigated, but an established protocol for achieving the best osseointegration results is lacking.</span></div></div><div><h3>Purpose</h3><div><span>The purpose of this systematic review was to investigate the influence of drill rotational speed on bone drilling for </span>dental implant placement and its relationship with osseointegration.</div></div><div><h3>Material and methods</h3><div>This review included the preferred reporting items for systematic reviews and meta-analyses (PRISMA) and was registered in the international prospective register of systematic reviews (PROSPERO) database. Electronic searches were performed in the MEDLINE (PubMed), Scopus, Science Direct, and Embase databases. The risk of bias was analyzed by using the systematic review center for laboratory animal experimentation (SYRCLE).</div></div><div><h3>Results</h3><div>A total of 1282 articles were found, and after removing duplicates and applying the eligibility criteria to in vivo articles on animals that addressed drilling speed and its relationship to osseointegration, 8 articles were selected for analysis. Of these, 5 articles showed no statistical differences, and 3 others showed significantly better osseointegration results by analyzing the parameters of BIC, BAFO, ISQs, and pull-out forces (PoFs). In all selected articles, high-speed drilling was performed with irrigation.</div></div><div><h3>Conclusions</h3><div>Although drilling speed seems to affect bone perforation, no definitive protocol was found in the literature consulted. The results vary depending on the combination of different factors, including bone type, irrigation, and drilling speed.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"133 2","pages":"Pages 394-401"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9245702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Are the counts of Streptococcus mutans and Staphylococcus aureus changed in complete denture wearers carrying denture stomatitis? A systematic review with meta-analyses 全口义齿佩戴者的变形链球菌和金黄色葡萄球菌计数是否有变化?荟萃分析的系统综述。

IF 4.3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Prosthetic Dentistry

Pub Date : 2025-02-01 DOI: 10.1016/j.prosdent.2023.03.015

Caio Sampaio DDS, MSc, PhD , Juliano P. Pessan DDS, MSc, PhD , Gabriel P. Nunes DDS, MSc , Marcela B. Magno DDS, MSc, PhD , Lucianne C. Maia DDS, MSc, PhD , Rob Exterkate PhD , Dongmei Deng DDS, PhD , Douglas R. Monteiro DDS, MSc, PhD

Statement of problem

Despite the importance of Candida spp. on the etiology of denture stomatitis (DS), information on the role of the bacterial component is still scarce.

Purpose

The purpose of this systematic review was to evaluate whether the counts of Staphylococcus aureus and Streptococcus mutans were changed in complete denture wearers diagnosed with Candida-associated DS.

Material and methods

The literature search was performed in 8 databases and by hand searching. The risk of bias was assessed according to the Newcastle-Ottawa qualifier. Meta-analyses were performed considering the microorganism evaluated (S. aureus or S. mutans) and the collection area (mucosa or dentures). The certainty of evidence was assessed according to the grading of recommendations assessment, development and evaluations (GRADE) criteria.

Results

Participants with DS presented higher counts of S. aureus in the mucosa compared with those from the control group (OR, 3.16 [1.62, 6.15]; P<.001). No significant difference between the groups was observed for samples collected from dentures (OR, 0.73 [0.50, 1.07]; P=.110). Conversely, participants without DS presented higher counts of S. mutans both in the mucosa (OR, 0.19 [0.06, 0.63]; P=.006) and dentures (OR, 0.64 [0.41, 1.0]; P=.050).

Conclusions

Microbial counts in participants with DS changed as a function of the type of microorganism and collection site. The certainty of evidence ranged from very low to low. The findings reinforce the fact that bacteria also play a relevant role in DS and should be more extensively studied. Such information may be useful to guide further therapies to prevent or control DS.

问题陈述:尽管念珠菌在假牙口炎(DS)的病因学上很重要，但关于细菌成分的作用的信息仍然很少。目的:本系统综述的目的是评估诊断为念珠菌相关性DS的全口义齿佩戴者的金黄色葡萄球菌和变形链球菌计数是否发生改变。材料和方法:在8个数据库中进行文献检索，采用人工检索。偏倚风险根据纽卡斯尔-渥太华预选赛进行评估。考虑评估的微生物(金黄色葡萄球菌或变形葡萄球菌)和收集区域(粘膜或假牙)进行meta分析。根据推荐评估、发展和评价(GRADE)标准的分级来评估证据的确定性。结果:与对照组相比，DS患者粘膜中金黄色葡萄球菌计数较高(OR, 3.16 [1.62, 6.15];结论:DS患者的微生物计数随微生物类型和采集地点的变化而变化。证据的确定性从极低到极低不等。这一发现强化了细菌在退行性痴呆中也起着相关作用的事实，应该进行更广泛的研究。这些信息可能有助于指导进一步预防或控制退行性椎体滑移的治疗。

{"title":"Are the counts of Streptococcus mutans and Staphylococcus aureus changed in complete denture wearers carrying denture stomatitis? A systematic review with meta-analyses","authors":"Caio Sampaio DDS, MSc, PhD , Juliano P. Pessan DDS, MSc, PhD , Gabriel P. Nunes DDS, MSc , Marcela B. Magno DDS, MSc, PhD , Lucianne C. Maia DDS, MSc, PhD , Rob Exterkate PhD , Dongmei Deng DDS, PhD , Douglas R. Monteiro DDS, MSc, PhD","doi":"10.1016/j.prosdent.2023.03.015","DOIUrl":"10.1016/j.prosdent.2023.03.015","url":null,"abstract":"<div><h3>Statement of problem</h3><div>Despite the importance of <em>Candida</em><span> spp. on the etiology of denture stomatitis (DS), information on the role of the bacterial component is still scarce.</span></div></div><div><h3>Purpose</h3><div><span>The purpose of this systematic review was to evaluate whether the counts of </span><span><span>Staphylococcus aureus</span></span> and <span><span>Streptococcus mutans</span></span> were changed in complete denture wearers diagnosed with <em>Candida</em>-associated DS.</div></div><div><h3>Material and methods</h3><div>The literature search was performed in 8 databases and by hand searching. The risk of bias was assessed according to the Newcastle-Ottawa qualifier. Meta-analyses were performed considering the microorganism evaluated (<em>S. aureus</em> or <em>S. mutans</em>) and the collection area (mucosa or dentures). The certainty of evidence was assessed according to the grading of recommendations assessment, development and evaluations (GRADE) criteria.</div></div><div><h3>Results</h3><div>Participants with DS presented higher counts of <em>S. aureus</em><span> in the mucosa compared with those from the control group (OR, 3.16 [1.62, 6.15]; </span><em>P</em><.001). No significant difference between the groups was observed for samples collected from dentures (OR, 0.73 [0.50, 1.07]; <em>P</em>=.110). Conversely, participants without DS presented higher counts of <em>S. mutans</em> both in the mucosa (OR, 0.19 [0.06, 0.63]; <em>P</em>=.006) and dentures (OR, 0.64 [0.41, 1.0]; <em>P</em>=.050).</div></div><div><h3>Conclusions</h3><div>Microbial counts in participants with DS changed as a function of the type of microorganism and collection site. The certainty of evidence ranged from very low to low. The findings reinforce the fact that bacteria also play a relevant role in DS and should be more extensively studied. Such information may be useful to guide further therapies to prevent or control DS.</div></div>","PeriodicalId":16866,"journal":{"name":"Journal of Prosthetic Dentistry","volume":"133 2","pages":"Pages 427-437"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9420974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Digital design and fabrication of a template to prepare guiding planes in removable partial denture abutments 可摘局部义齿基台导平面模板的数字化设计与制造。

IF 4.3 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Prosthetic Dentistry

Pub Date : 2025-02-01 DOI: 10.1016/j.prosdent.2023.03.029

Jiang Wu PhD, DDS , Liaoliao Wang MDS , Bo Gao PhD, DDS

Guiding planes are essential to the success of removable partial dentures (RPDs). With computer-aided design and computer-aided manufacturing (CAD-CAM), this report presents a novel method of designing and fabricating preparation templates to precisely prepare guiding planes for RPD abutments.

引导平面是可摘局部义齿成功的关键。本文利用计算机辅助设计和计算机辅助制造(CAD-CAM)技术，提出了一种设计和制作RPD基台导向平面的制备模板的新方法。

引用次数: 0