Hua xi kou qiang yi xue za zhi = Huaxi kouqiang yixue zazhi = West China journal of stomatology最新文献

Objectives: This work aimed to evaluate the effect of speed sintering and low-temperature degradation on the translucency of high-translucent zirconia.

Methods: The ST and TT specimens were randomly divided into two groups depending on the sintering process: conventional sintering and speed sintering. The sintered specimens were divided into three subgroups according to the aging time: aged for 0, 5, and 20 h. Chromatic parameters (L*, a*, and b* values) were measured by Shade Eye NCC computer colorimeter in a dark environment under black and white background, and the translucency parameter (TP) was used to evaluate the translucency of zirconia.

Results: Speed sintering may decrease the TP of ST and increase the TP of TT. As for the effect of low-temperature degradation on the translucency of zirconia, the TP of ST decreased with the extension of aging time, and no significant difference was found in rapid sintering ST. Although the TP of TT decreased, no statistical difference was observed.

Conclusions: Speed sintering may decrease the translucency of high-strength zirconia and increase the translucency of high-translucent zirconia. Low-temperature degradation had no effect on the translucency of high-translucent zirconia. Speed sintering can be recommended for high-translucent zirconia in terms of translucency.

Objectives: This study aims to test the reliability and validity of the Chinese version of the Asher-McDade aesthetic index and clarify its feasibility for the postoperative outcome evaluation of cleft lip in China.

Methods: The Chinese version of the Asher-McDade aesthetic index was established through translation, back translation, debugging, and pre-survey. Eighty postoperative photographs of patients with cleft lip admitted to the West China Hospital of Stomatology, Sichuan University were included. Ten healthcare professionals, including surgeons, nurses, and students, in the department of cleft lip and palate surgery finished the index to test its reliability and validity.

Results: The Cronbach's alpha coefficient and retest reliability of this index are 0.804 and 0.895, respectively. The item-level content validity index (I-CVI) and scale-level content validity index ave-rage (S-CVI/ave) of the index are 1.000 and 0.95, respectively. For this index, the Kaiser-Meyer-Olkin (KMO) test score is 0.706, the χ² value of Bartlett's test for the consistency of the index is 962.260 (P<0.01), and the cumulative variance contribution rate is 63.095%.

Conclusions: The Chinese version of the Asher-McDade aesthe-tic index has good reliability and validity and is applicable to the professional evaluation of the effect of postoperative photographs in Chinese patients with cleft lip.

In the field of prosthodontics, the use of virtual patients for biomimetic restoration holds great promise for various applications. Virtual patients consist of digitized data that encompasses details on the morphology, structure, and spatial relationships within the maxillofacial and intraoral regions. Nonetheless, there are several challenges associated with acquiring digital data, achieving accurate alignment, and recording and transferring dynamic jaw movements. This paper aims to concentrate on the process of constructing virtual patients, highlight the key and challenging aspects of virtual patient construction, and advocate for the extensive adoption and utilization of virtual patient technology.

Objectives: This study aimed to compare the differences among four kinds of mechanical Ni-Ti files including T-Flex, Reciproc Blue (RB), ProTaper Gold (PTG), and ProTaper Universal (PTU) in dentinal microcrack generation after root canal preparation in vitro by using micro-computed tomography (micro-CT) analysis.

Methods: A total of 32 freshly extracted double-root-canal premolars with an angle not exceeding 10° were selected and established as root canal preparation models in vitro. Then, the specimens were randomly assigned to four experimental groups (n=8) according to the different Ni-Ti systems used for root canal preparation: group T-Flex, group RB, group PTG, and group PTU. The voxel size of the micro-CT was set at 17.18 μm. Pre- and post-operative cross-sectional images of roots (n=56 940) were scanned and analyzed to identify the presence of dentinal microcracks. The results of each group were expressed by the quantity and percentage of sectional images with microcracks. McNemar test was used to determine whether a significant difference existed in the existence of dentinal microcracks before and after instrumentation. The level of significance was set at P<0.05.

Results: Overall, 11.04% of the images presented dentinal defects (n=6 288). Dentinal microcracks were observed in 9.82%, 10.79%, 12.27%, and 11.25% of the post-instrumentation images from groups T-Flex, RB, PTG, and PTU, respectively. However, all these dentinal microcracks were already present in the corresponding pre-operative images. No new microcrack of premolars were generated after the root canal preparation utilizing the aforementioned systems.

Conclusions: Denti-nal microcracks already existed in advance in extracted teeth before root canal preparation. Root canal preparation using the T-Flex, RB, PTG, and PTU systems did not induce the formation of new dentinal microcracks on the straight root canals of premolars.

Noncarious lesions, a multifactorial condition encompassing tooth attrition, abrasion, and erosion, have a surge in prevalence and required increased attention in clinical practice. These nonbacterial-associated tooth defects can compromise aesthetics, phonetics, and masticatory functions. When providing full-arch fixed occlusal rehabilitation for such cases, the treatment strategy should extend beyond by restoring dentition morphology and aesthetics. This report details a complex case of erosive dental wear addressed through a fully digital, full-arch fixed occlusal rehabilitation. A 4D virtual patient was created using multiple digital data sources, including intraoral scanning, 3D facial scanning, digital facebow registration, and mandibular movement tracing. With a comprehensive understanding of the masticatory system, various types of microinvasive prostheses were customized for each tooth, including labial veneers, buccal-occlusal veneers, occlusal veneers, overlays, inlays, and full crowns, were customized for each tooth. The reported digital workflow offered a predictable diagnostic and treatment strategy, which was facilitated by virtual visualization and comprehensive quality control throughout the process.

Objectives: This study aims to explore the status quo of health literacy and quality of life in elderly patients with chronic periodontitis and determine their correlation to understand the influencing factors of health literacy and quality of life.

Methods: A total of 150 elderly patients with chronic periodontitis were investigated using the general information questionnaire, Oral Health Literacy-Adult Questionnaire, and Oral Health Impact Profile for Chronic Periodontitis.

Results: The total scores of health literacy and quality of life of elderly patients with chronic periodontitis were 6.59±4.11 and 29.25±9.42, respectively. The total score of health literacy was negatively correlated with the total score of quality of life (r=-0.234, P<0.01). Regression analysis showed that age, place of residence, education level, and disease understanding were the influencing factors of health literacy. Family history, smoking, and education level were the influencing factors of quality of life.

Conclusions: The health literacy level of elderly patients with chronic periodontitis is insufficient, and their quality of life needs to be improved. Improving the health literacy of patients is an effective way to improve their quality of life. Nursing staff must formulate corresponding health education strategies to improve the health literacy of patients and improve their quality of life.

Orthodontics is a discipline that is based on aesthetics. It coordinates the relationship among nose, lip, and chin through the movement of teeth and the adjustment of jaw relationship. Orthodontists need to fully analyze the patient's soft tissue profile before treatment. They also need to analyze the existing problems and those that may be solved or caused during orthodontics to guide the design of orthodontic treatment and effectively improve the clinical effect of orthodontics. This article reviews the aesthetic preconditions that guide the design of orthodontic treatment from the perspective of orthodontists.

Objectives: The clinical effects and surgical procedures of Hogan posterior pharyngeal flap in the treatment of the older patients with velopharyngeal insufficiency (VPI) after cleft palate repair were investigated.

Methods: A total of 33 patients (aged 10-35 years; average of 20.4 years) with VPI secondary to cleft palate were included. They underwent Hogan posterior pharyngeal flap to improve velopharyngeal closure function. The clinical efficacy of the ope-ration was evaluated with Chinese speech clarity measurement and nasopharyngeal fiberscope (NPF), and the velopharyngeal closure was graded. The average follow-up time was 13.3 months.

Results: The wounds of all patients were healed by first intention, and speech assessment showed that the consonant articulation increased and the rate of hypernasality and nasal emission decreased significantly (P<0.05). NPF examination showed that the postoperative velopharyngeal closure function significantly improved, 30 cases (91%) were gradeⅠ, and 3 cases (9%) were grade Ⅱ.

Conclusions: Hogan posterior pharyngeal flap for VPI secondary to cleft palate can significantly improve velopharyngeal closure.

Objectives: To study the risk factors of poor wound healing after primary cleft palate surgery.

Methods: In this study, 980 cases of congenital cleft palate treated by Sommerlad-Furlow in the Department of Cleft Lip and Palate Surgery of Sichuan University from 2017 to 2021 were continuously analyzed. Indicators included patient's age, gender, body weight, cleft palate type, width of the widest fistula, cleft palate index (width of the widest fistula/width at the posterior edge of the maxillary tubercle plane), preoperative white blood cell count, preoperative hemoglobin level, preoperative antibiotic use, doctor's seniority, use of relaxation incision, operation time, postoperative upper respiratory tract infection, and postoperative wound healing. The postoperative wound healing was divided into normal healing, delayed healing, and palatal fistula. Both delayed healing and palatal fistula were classified as poor healing. The factors that may affect the healing outcome of the palatal wound after primary cleft palate repair were analyzed using SPSS 26.0 software.

Results: A total of 825 patients (84.2%) had normal healing, 112 patients (11.4%) had delayed hea-ling, and 43 patients (4.4%) had palatal fistula. Doctor's seniority, width of the widest fissure, cleft palate index, and operation time influenced the wound healing effect after cleft palate surgery (P<0.05). Doctors with low seniority, wide width of the widest fistula, large cleft palate index, and long operation time were the risk factors of poor wound healing.

Conclusions: Doctor's seniority, width of the widest fissure, cleft palate index, and operation time are related to the effect of healing effect after cleft palate surgery.

Objectives: To solve the current problems of loosening and dislodging caused by the high elastic modulus of solid implants, we attempted to study a gradient porous dental implant that can lower the stress concentration and reduce the elastic modulus.

Methods: SolidWorks software was utilized to design the abutment and mechanical structure of the gradient porous implant. The mechanical properties of the gradient porous implant were evaluated by an orthogonal experimental design from four aspects: pore shape, pore diameter, porous layer height, and circumferential distribution. ANSYS software was used to evaluate the distribution of Von-Mises stress in the implant and its surrounding bone tissues under different structural combination parameters to derive the optimal combination of gradient porous implant parameters.

Results: The effects of the four factors, namely, pore shape, pore diameter, porous layer height and pore distribution, on the maximum Von-Mises stress on the implant were as follows. As the pore shape became smaller and the circumferential distribution decreased, the Von-Mises stress decreased significantly. The pore diameter went from 500 μm to 600 μm and then to 700 μm. The Von-Mises stress decreased and then increased. It increased with the increase in the height of the porous layer.

Conclusions: The final optimal combination of parameters for the gradient porous implant was as follows: square pore shape, pore diameter of 600 μm, porous layer height of 3 mm, and quadratic step in pore distribution.