Clinical, Cosmetic and Investigational Dentistry最新文献

Background: The symmetry between maxillary anterior teeth and the face holds significant importance. This study assessed and analyzed the relationship between facial parameters and anterior teeth in the maxillary arch of male and female subjects. Specifically, individual width and combined width (CW) measurements of the maxillary anterior teeth were investigated.

Methods: This study involved a total of 150 dentate Yemeni subjects (74 men and 76 women), whose ages ranged from 18 years old to 30 years old. A maxillary cast was created, and two digital photographs of the face of each subject were taken and analyzed. Digital calipers and AutoCAD were used to gather measurement data of the dental parameters (intercanthal distance [ICD], interpupillary distance [IPD], interalar width [IAW], intercommissural width [ICW], and bizygomatic width [BZW]) and facial parameters (profile distance).

Results: Significant correlations were found for the following: IPD and width of six maxillary anterior teeth of each of the study subjects; ICD and their central incisors; and BZW and their canine width measurements. In contrast, IAW and ICW were not correlated with all tooth measurements. Linear regression findings showed that the CW measurement of the four incisors was significantly correlated with all facial parameter measurements, excluding the ICW and IAW in females and the IAW, ICW, and profile distance in males.

Conclusion: The IPD and ICD of males and females may be used to determine their CW measurements. The BZW and IPD of males can be used to take precise anthropological measurements of the width of the central canines and incisors. Meanwhile, the IPD distance of females can be used to assess the central and lateral incisor widths.

Introduction: Matrix metalloproteinases enzymes (MMPs) can degrade the hybrid layer which can cause failure of composite restorations. Chlorhexidine gluconate 2% can reduce MMPs activity and increase the bond strength of the resin to dentin.

Purpose: This study aims to determine the role of the duration of chlorhexidine gluconate 2% application on shear bond strength of a total-etch bonding agent.

Methods: A total of 36 freshly extracted maxillary premolars were removed occlusally by one-third of the crown using a carborundum disc until the dentin was exposed. Specimens were divided into four groups n(9). The dentin surfaces were etched for 5s. Group A is the control group. In group B, chlorhexidine gluconate 2% was applied for 30s. In group C, chlorhexidine gluconate 2% was applied for 60s. In group D, chlorhexidine gluconate 2% was applied for 90s. The universal adhesive was applied afterwards and then followed by composite to the dentin surface. All specimens were stored in artificial saliva at 37°C for 24 hours. The shear bond strength was tested using a universal testing machine.

Results: There was an increase in the shear bond strength of the bonding agent along with the additional application duration of chlorhexidine gluconate 2%. All groups gave higher MPa values than the control group. The shear bond strength in group A (control) was 12.64 MPa; Group B (30s of chlorhexidine) was 16.93 MPa; Group C (60s chlorhexidine) was 18.23 MPa; group D (90s of chlorhexidine) was 18.47MPa.

Conclusion: Duration of chlorhexidine gluconate 2% application affects the shear bond strength of the bonding agent with the total-etch system. The effective duration of chlorhexidine gluconate 2% for the restorative procedure is 60 seconds.

Background: Lingual plate thickness, density, and proximity to the tooth are linked as risk factors for various complications associated with third molar extraction. The present study aimed to assess the lingual plate thickness, and density in the mandibular third molar region using cone beam computed tomography and to estimate its correlation with type and level of impaction, number of roots, age, and gender as the risk factors.

Methods: This was a retrospective study on CBCT images of 648 mandibular third molars. The lingual plate thickness at three different root levels - cervical, mid-root, and apex along with the position of the tooth, number of roots, density of lingual plate, age, and gender were evaluated. The measurements were done on Invivo 5-Anatomage software. Statistical comparison of the categorical variables was done by Chi-square test, and Fisher's exact test, and univariate and multivariate analysis were done using binomial logistic regression.

Results: Lingual plate thickness of the third molars at the cervical, mid root, and apex were 1.28 mm, 1.42 mm and .01 mm (mean). A significantly higher proportion of subjects with thin lingual plates at mid-root (p-value=0.01) and apex (p-value=0.05) were in the 21-30 age group. Lingual bone density was significantly associated with the thickness of the lingual plate at the mid-root. A significantly higher proportion of thinner lingual plates at the mid-root level were associated with mesioangularly placed third molars (p-value=0.002).

Conclusion: Our study presented that lingual plate thickness has a strong association with age, angulation, and the number of roots. Knowledge about these risk factors is imperative during the management of third molar impactions.

Endodontic orthograde retreatments are considered one of the possible treatment options in case of post-treatment diseases considering the promising results present in the literature. Despite this, a plethora of articles have been published on this topic, and drawing conclusions could be challenging. For this reason, this review aims to summarize the crucial points on each aspect of non-surgical endodontic retreatments, discussing and comparing the current protocols, techniques, materials, and indications. Taking into consideration data from the literature, in terms of diagnosis, CBCT should be considered the first choice, since it can thoroughly affect the diagnosis and treatment plan. Regarding the procedural phases, some conclusions can be drawn: when present, coronal restoration materials such as crowns, partial prostheses, post, and core should be removed; the use of magnification devices, ultrasonic instruments, and an in-depth interpretation of radiographic images with both 2D and 3D images are strongly recommended during the orifice location; additional protocols such as irrigants activation, ultrasonic cleaning, and rotary or reciprocating instrumentation of treated canals are strongly recommended for filling materials removal and to achieve a high-quality chemo-mechanical disinfection; perforations should be treated as soon as possible, and the material of choice to treat them is the MTA or other calcium-silicate-based repair materials; the presence of ledges does not intrinsically reduce the success rate of RCRts if properly managed; in case of instrument fragments, their removal should be considered as the first treatment option, however many variables should be considered to select the proper technique or consider the option of bypassing.

Background: Sex hormones strongly influence the health and ailment of the oral cavity. For instance, a woman's oral health is influenced by her menstrual cycle, menopause, pregnancy, and usage of oral contraceptives. The use of various therapeutic medication results in intraoral alterations. Oral contraceptive pills (OCPs) are among the drugs that produce intraoral alterations. The study's objective was to evaluate attitudes and oral health conditions of Saudi women's utilizing OCPs in Jeddah, Saudi Arabia.

Methods: A cross-sectional questionnaire-based study was conducted among Saudi women in Jeddah, Saudi Arabia. The self-administered questionnaire was made and sent to women to evaluate the attitude and oral health condition of women utilizing OCPs. The women using OCPs were asked to self-administer 17 questions to evaluate attitudes and oral health conditions. The questionnaire had multiple-choice questions and was consisted of four sections.

Results: The number of participants who used contraceptives was 125 (35.9%) women; of them, only 94 (75.2%) used oral contraceptives. The duration of using oral contraceptives mainly was 1-5 years (39.4%), then > 5 years (34.0%), and <1 year (26.6%). Of the 94 women, 34 (36.2%) had gingival diseases, 23 (24.5%) treated their gums; and 13 (13.8%) cleaned their gums at a dental clinic regularly. Times of teeth brushing per day were one time in 32 women (34%), twice in 47 women (50.0%), and three times in 15 (16.0%). Of the 94 women, 4 (4.3%) were smoking, 24 (25.5%) took medication other than OCPs, and 16 (17.02%) had chronic diseases. Common oral complications noticed by participants were gum bleeding after brushing (51.6%), dental caries (25.5%), and oral ulcers (10.6%).

Conclusion: Females on OCPs had a high rate of gingival bleeding, dental caries, and oral ulcers. OCPs users had poor periodontal and gingival health. Establishing an oral hygiene program was necessary to treat gingival and periodontal inflammation that exacerbated by OCPs.

Background: Physicians are more likely to examine children than dentists; thus, they may have a significant role in detecting oral and dentofacial problems. This study aimed to determine the rate and comprehensiveness of examinations, the rate and quality of referral practices, and the predictors of referral practice of physicians regarding orthodontic problems among children.

Methods: In a multi-center cross-sectional study, a total of 518 physicians in Saudi Arabia were subjected to an e-questionnaire of four sections: (1) Physicians' demographic and work-related characteristics; (2) Physicians' comprehensiveness of oral and orthodontic examinations; (3) Physicians' referral practices to orthodontists and reasons considered for referral; and (4) Physicians' sources of orthodontic education. Logistic regression analysis was applied to identify the significant predictors of referral practice. The significance was set at p < 0.05.

Results: Most physicians reported partial oral (78.5%) and orthodontic (72.2%) examinations, while the full examination was reported by only 12% and 2.5% of physicians, respectively. Referral to orthodontists was practiced by most of the physicians (83.8%), yet for the majority of them, the quality of referral was poor (40.3%) or fair (46.1%), with only 13.6% who practiced quality referral. Dental development issues (53.3%) and functional issues (51.5%) were reported as the main reasons for referral, followed by family/patient request (42.9%), dental alignment (42.5%), oral respiratory issues (32.4%), and finally jaw relation (26.1%). Referral practice was predicted by the comprehensive oral (OR = 2.37, p = 0.007) and orthodontic (OR = 4.26, p < 0.001) examinations, number of patients seen by the physician (OR = 1.58, p = 0.007), and level of training (OR = 1.88, p = 0.03).

Conclusion: Although most physicians reported high rates of examination and referral practices on orthodontic problems among children in Saudi Arabia, only a small portion showed comprehensive examinations and quality referral practice. Including dental courses in medical curricula and improving oral and orthodontic examination guidelines for physicians are recommended.

Objective: The aim of this study was to determine the prevalence of mandibular third molar malposition and its impact in relation to the lower second molar using panoramic radiography.

Methods and materials: This was a cross-sectional descriptive study of 353 panoramic images of patients who visited the Dental Clinic of the International University of Rabat. Panoramic images were analyzed in order to determine the number of second molar pathologies associated with the positions of third molars. The following radiographic lesions on the second molar were recorded: caries, root resorption and distal alveolysis. The Chi-square test was used to assess the association between different variables.

Results: Of these 353 radiographies, 169 were males, ie, 48%, and 184 were females, ie, 52%. The age range was from 18 to 63 years. The prevalence of the impacted position of the lower third molar was noted in 60%. Distal caries on the second mandibular molar was present in 47.5% of instances having an impacted third molar. Caries was present in 65.5% of wisdom teeth in a normal position and was also present in 79.6% of the impacted teeth. This difference was statistically significant with p = 0.01. The angulation of the third molar is a factor of caries of the second molar: 58.56% of them were carious. Of all the teeth in association with an angulation, 72.03% showed distal alveolysis in the second molar. In addition, root resorption was found in 20.4% of second molars linked to a wisdom tooth in all angulation occurrences.

Conclusion: It has been noted that among the pathologies seen on the mandibular second molar, distal alveolysis accounts for the majority of cases (58%), followed by caries (47.5%) and root resorption (13.3%). This study illustrated the importance of performing Orthopantomogram X-rays at each new consultation in patients over the age of 18.