The objective of this research is to evaluate the effects of different silane coupling agents on the bond strength between Ceramco3 opaque porcelain and indirect composite resin. Five groups of Co-Cr metal alloy substrates were fabricated according to manufacturer's instruction. The surface of metal alloy with a layer of dental opaque porcelain was heated by fire. After the surface of opaque porcelain was etched, five different surface treatments, i.e. RelyX Ceramic Primer (RCP), Porcelain Bond Activator and SE Bond Primer (mixed with a proportion of 1:1) (PBA), Shofu Porcelain Primer (SPP), SE bond primer (SEP), and no primer treatment (as a control group), were used to combine P60 and opaque porcelain along with resin cement. Shear bond strength of specimens was tested in a universal testing machine. The failure modes of specimens in all groups were observed and classified into four types. Selected specimens were subjected to scanning electron microscope and energy disperse spectroscopy to reveal the relief of the fracture surface and to confirm the failure mode of different types. The experimental results showed that the values of the tested items in all the tested groups were higher than that in the control group. Group PBA exhibited the highest value [(37.52 +/- 2.14) MPa] and this suggested a fact that all of the specimens in group PBA revealed combined failures (failure occurred in metal-porcelain combined surface and within opaque porcelain). Group SPP and RCP showed higher values than SEP (P < 0.05) and most specimens of SPP and RCP performed combined failures (failure occurred in bond surface and within opaque porcelain or composite resin) while all the specimens in group SEP and control group revealed adhesive failures. Conclusions could be drawn that silane coupling agents could reinforce the bond strength of dental composite resin to metal-opaque porcelain substrate. The bond strength between dental composite resin and dental opaque porcelain could meet the clinical requirements.
Acrylic Resins ; chemistry ; Ceramics ; chemistry ; Composite Resins ; chemistry ; Dental Bonding ; Dental Porcelain ; chemistry ; Humans ; Polyurethanes ; chemistry ; Resin Cements ; chemistry ; Silanes ; chemistry

OBJECTIVETo evaluate the accuracy of positron emission tomography (PET)/computed tomography (CT) for detecting cervical nodule metastases of oral and maxillofacial cancer.

METHODSDiagnostic test accuracy studies assessing the accuracy of PET/CT in diagnosis of cervical metastases of oral and maxillofacial cancer were retrieved from the databases of CBM, Medline (OVID) and EMBASE (searched on Dec. 13th, 2010) and manual searching of 19 dental journals in Chinese. Two researchers were employed in the articles investigation independently and evaluated the quality with quality assessment of diagnostic accuracy studies (QUADAS). Meta-analysis was done using MetaDisc 1.4.

RESULTSNine studies met the inclusion criteria and demonstrated high methodological quality. The results of Meta-analysis showed that, when nodal level was used as unit, PET/CT had good diagnostic value in detecting the cervical nodule metastases of oral and maxillofacial cancer. Under such a condition, the pooled sensitivity was 0.84, pooled specificity 0.93, pooled diagnostic odds ratio 47.89 and area under the curve 0.973 8.

CONCLUSIONThe accuracy of PET/CT for detecting cervical nodule metastases of oral and maxillofacial cancer is relatively high and it could be used as a good diagnostic tool. And special attention should be payed to its diagnostic expense and safety when considering PET/CT.

Humans ; Lymphatic Metastasis ; Mouth Neoplasms ; Multimodal Imaging ; Positron-Emission Tomography ; Sensitivity and Specificity ; Tomography, X-Ray Computed

OBJECTIVETo measure the agreement, reliability and validity of assessment of multiple systematic reviews (AMSTAR) to assess Chinese systematic reviews on stomatology.

METHODSA comprehensive electronic search was made through Chinese BioMedical Literature Database, VIP Database for Chinese Technical Periodicals and China National Knowledge Infrastructure electronically on March 1st 2011 together with handsearch through 19 stomatological journals to identify published Chinese systematic reviews on stomatology. Each systematic review was assessed by two reviewers with overview quality assessment questionnaire (OQAQ) and AMSTAR. And reliability (interobserver Kappa of the 11 AMSTAR items), interclass correlation coefficient (ICC) of the sum scores and construct validity (ICC of the sum scores of AMSTAR compared with those of the OQAQ) were reported.

RESULTSA total of 52 systematic reviews on stomatology were eligible. The reviewers agreement of the individual items of AMSTAR was with a mean Kappa of 0.81 [95% CI(0.73, 0.89)] while the OQAQ was 0.74 [95% CI (0.66, 0.83)]. The ICC of the total score for AMSTAR was 0.98 [95% CI (0.97, 0.99), P = 0.000]. Cronbach' alpha was 0.69 [95% CI (0.56, 0.80), P = 0.000]. And ICC of the sum scores of AMSTAR compared with those of the OQAQ was 0.94 [95% CI (0.90, 0.97), P = 0.000].

CONCLUSIONAMSTAR has good agreement, reliability and validity. AMSTAR can be well used in Chinese stomatology and can bring dentists much convenience when assess the methodological quality of systematical reviews on stomatology.

China ; Humans ; Oral Medicine ; Publishing ; Quality Control ; Reproducibility of Results ; Review Literature as Topic

On page 219, there was an error in the Fig. 5.

PURPOSE: To measure the surface loss of dental restorative zirconia and the short-term bond strength between an indirect composite resin (ICR) and zirconia ceramic after various sandblasting processes. MATERIALS AND METHODS: Three hundred zirconia bars were randomly divided into 25 groups according to the type of sandblasting performed with pressures of 0.1, 0.2, 0.4 and 0.6 MPa, sandblasting times of 7, 14 and 21 seconds, and alumina powder sizes of 50 and 110 microm. The control group did not receive sandblasting. The volume loss and height loss on zirconia surface after sandblasting and the shear bond strength (SBS) between the sandblasted zirconia and ICR after 24-h immersion were measured for each group using multivariate analysis of variance (ANOVA) and Least Significance Difference (LSD) test (alpha=.05). After sandblasting, the failure modes of the ICR/zirconia surfaces were observed using scanning electron microscopy. RESULTS: The volume loss and height loss were increased with higher sandblasting pressure and longer sandblasting treatment, but they decreased with larger powder size. SBS was significantly increased by increasing the sandblasting time from 7 seconds to 14 seconds and from 14 seconds to 21 seconds, as well as increasing the size of alumina powder from 50 microm to 110 microm. SBS was significantly increased from 0.1 MPa to 0.2 MPa according to the size of alumina powder. However, the SBSs were not significantly different with the sandblasting pressure of 0.2, 0.4 and 0.6 MPa. The possibilities of the combination of both adhesive failure and cohesive failure within the ICR were higher with the increases in bonding strength. CONCLUSION: Based on the findings of this study, sandblasting with alumina particles at 0.2 MPa, 21 seconds and the powder size of 110 microm is recommended for dental applications to improve the bonding between zirconia core and ICR.
Adhesives ; Aluminum Oxide ; Ceramics ; Immersion ; Microscopy, Electron, Scanning ; Multivariate Analysis

The current study aimed to explore the types and frequencies of uncommon complications associated with third molar extractions based on a scoping review of case reports and case series. The study used an electronic literature search based on PubMed and Embase up to March 31, 2020, with an update performed on October 22, 2021. Any case reports and case series that reported complications associated with third molar extractions were included. The types of complications were grouped and the main symptoms of each type of complication were summarized. A total of 51 types of uncommon complications were identified in 248 patients from 186 studies. Most types of complications were post-operative. In the craniofacial and cervical regions, the most frequent complications included iatrogenic displacement of the molars or root fragments in the craniofacial area, late mandibular fracture, and subcutaneous emphysema. In other regions, the most frequent complications include pneumomediastinum, pneumorrhachis, pneumothorax, and pneumopericardium. Of the patients, 37 patients had life-threatening uncommon complications and 20 patients had long-term/irreversible uncommon complications associated with third molar extractions. In conclusion, a variety of uncommon complications associated with third molar extractions were identified. Most complications occurred in the craniofacial and cervical regions and were mild and transient.