Reducing the risk of intraoral radiographic imaging with collimation and thyroid shielding.

The 2007 modification by the International Commission on Radiation Protection of the calculation of effective dose from ionizing radiation has renewed interest in the concept of As Low As Reasonably Achievable exposure, and the technical approaches for reducing doses. This intraoral imaging study compared effective doses from circular and rectangular collimator modalities. A total of 18-image adult and 12-image child full mouth series were exposed using a 6 cm diameter circular collimator, a universal rectangular collimator, and an enhanced rectangular device for both adult and child phantoms. Rectangular collimation significantly reduced doses for adult exposures. In the child sample, only the universal rectangular collimator achieved significant dose reduction. While dose differences were attributed to both the size of the rectangular field and the use of thyroid shielding, the results indicated that the universal rectangular collimator used alone was more effective at reducing thyroid exposure than a thyroid shield used with circular collimation.

Transitioning from pre-clinical to clinical dental radiology, a pilot study: Student perceived influences on confidence.

INTRODUCTION: Producing radiographic images requires the use of ionizing radiation, which has been well documented for its potentially detrimental effects on human tissues. Therefore, dental hygiene students begin their radiographic training by practicing on manikins in a pre-clinical environment. Use of manikins does not allow for patient interaction factors. No published dental studies have examined factors important in helping dental hygiene students develop confidence during the transition from manikins to working with live patients in a clinical radiology setting. PURPOSE/OBJECTIVES: The purpose of this study was to identify students' perceived influences on confidence and ultimately on performance when transitioning from a pre-clinical radiology setting to working with live patients. Specific research questions that were answered by this qualitative study were (1) What pre-clinical radiographic experiences did students feel were beneficial for transitioning from manikins to live patients? (2) What were the primary factors that students felt they struggled with when initially taking radiographs on patients? METHODS: A qualitative study design was implemented in 2017. Data were obtained from students in a 2-year dental hygiene program. Survey responses, focus group feedback, and observation data were used to identify common themes. Emergent themes were reported using frequencies, emic and etic expressions. RESULTS: Four themes surfaced surrounding patient management, communication, appointment mechanics, and infection control. CONCLUSION: The use of standardized simulated patients may enhance clinical preparedness and confidence.

The role of stationary intraoral tomosynthesis in reducing proximal overlap in bitewing radiography.

OBJECTIVES: This study examined the utility of stationary intraoral tomosynthesis (s-IOT) in opening proximal contacts in bitewing radiography. METHODS: 11 DENTSPLY Rinn Dental X-ray Teaching and Training Replica mannequins (Model #546002, Elgin, Ill) were imaged with a prototype s-IOT device (Surround Medical Systems, Morrisville, NC) and standard bitewing (SBW) technique. Premolar and molar bitewings were acquired with each system. Image receptor holders were used to position receptors and aid in the alignment of the position indicating devices. An expert operator (having more than 5 years of experience in intraoral radiography) acquired the images with the s-IOT prototype and standard intraoral X-ray devices. Images were assessed to analyze percentage overlap of the proximal surfaces using the tools available in ImageJ (NIH, Bethesda Maryland). RESULTS: 253-paired surfaces were included in the analysis. The difference in overlap was statistically significant with standard bitewing (SBW) images resulting in a median overlap of 13%, a minimum of 0%, a maximum of 100% and an interquartile range of 40%. s-IOT resulted in a median overlap of 1%, a minimum of 0%, a maximum of 37% and an interquartile range of 0%. The s-IOT prototype substantially reduced proximal surface overlap compared to conventional bitewing radiography. CONCLUSIONS: The use of s-IOT reduced proximal contact overlap compared to standard bitewing radiography for an experienced radiographer. Stationary intraoral tomosynthesis may be a potential alternative to SBW radiography, reducing the number of retakes due to closed contacts.

Effects of periodontal therapy on rate of preterm delivery: a randomized controlled trial.

OBJECTIVE: To test the effects of maternal periodontal disease treatment on the incidence of preterm birth (delivery before 37 weeks of gestation). METHODS: The Maternal Oral Therapy to Reduce Obstetric Risk Study was a randomized, treatment-masked, controlled clinical trial of pregnant women with periodontal disease who were receiving standard obstetric care. Participants were assigned to either a periodontal treatment arm, consisting of scaling and root planing early in the second trimester, or a delayed treatment arm that provided periodontal care after delivery. Pregnancy and maternal periodontal status were followed to delivery and neonatal outcomes until discharge. The primary outcome (gestational age less than 37 weeks) and the secondary outcome (gestational age less than 35 weeks) were analyzed using a chi test of equality of two proportions. RESULTS: The study randomized 1,806 patients at three performance sites and completed 1,760 evaluable patients. At baseline, there were no differences comparing the treatment and control arms for any of the periodontal or obstetric measures. The rate of preterm delivery for the treatment group was 13.1% and 11.5% for the control group (P=.316). There were no significant differences when comparing women in the treatment group with those in the control group with regard to the adverse event rate or the major obstetric and neonatal outcomes. CONCLUSION: Periodontal therapy did not reduce the incidence of preterm delivery. LEVEL OF EVIDENCE: I.

Characterization and preliminary imaging evaluation of a clinical prototype stationary intraoral tomosynthesis system.

PURPOSE: Technological advancements in dental radiography have improved oral care on many fronts, yet diagnostic efficacy for some of the most common oral conditions, such as caries, dental cracks and fractures, and periodontal disease, remains relatively low. Driven by the clinical need for a better diagnostic yield for these and other dental conditions, we initiated the development of a stationary intraoral tomosynthesis (s-IOT) imaging system using carbon nanotube (CNT) x-ray source array technology. Here, we report the system characterization and preliminary imaging evaluation of a clinical prototype s-IOT system approved for human use. METHODS: The clinical prototype s-IOT system is comprised of a multibeam CNT x-ray source array, high voltage generator, control electronics, collimator cone, and dynamic digital intraoral detector. During a tomosynthesis scan, each x-ray source is operated sequentially at fixed, nominal tube current of 7 mA and user-specified pulse width. Images are acquired by a digital intraoral detector and the reconstruction algorithm generates slice information in real time for operator review. In this study, the s-IOT system was characterized for tube output, dosimetry, and spatial resolution. Manufacturer specifications were validated, such as tube current, kVp, and pulse width. Tube current was measured with an oscilloscope on the analog output of the anode power supply. Pulse width, kVp, and peak skin dose were measured with a dosimeter with ion chamber and high voltage accessory. In-plane spatial resolution was evaluated via measurement of MTF and imaging of a line pair phantom. Spatial resolution in the depth direction was evaluated via artifact spread measurement. The size of the collimated radiation field was evaluated for compliance with FDA regulations. A dental phantom and human specimens of varying pathologies were imaged on a clinical 2D intraoral imaging system as well as s-IOT for comparison and to explore potential clinical applications. RESULTS: The measured tube current, kVp, and pulse width values were within 3% of the set values. A cumulative peak skin dose of 1.12 mGy was measured for one complete tomosynthesis scan using a 50-ms pulse per projection view. Projection images and reconstruction slices revealed MTF values ranging from 8.1 to 9.3 cycles/mm. Line pair imaging verified this result. The radiation field was found to meet the FDA requirements for intraoral imaging devices. Tomosynthesis reconstruction slice images of the dental phantom and human specimens provided depth resolution, allowing visibility of anatomical features that cannot be seen in the 2D intraoral images. CONCLUSIONS: The clinical prototype s-IOT device was evaluated and found to meet all manufacturer specifications. Though the system capability is higher, initial investigations are targeting a low-dose range comparable to a single 2D radiograph. Preliminary studies indicated that s-IOT provides increased image quality and feature conspicuity at a dose comparable to a single 2D intraoral radiograph.

Progressive periodontal disease and risk of very preterm delivery.

OBJECTIVE: The goal was to estimate whether maternal periodontal disease was predictive of preterm (less than 37 weeks) or very preterm (less than 32 weeks) births. METHODS: A prospective study of obstetric outcomes, entitled Oral Conditions and Pregnancy (OCAP), was conducted with 1,020 pregnant women who received both an antepartum and postpartum periodontal examination. Predictive models were developed to estimate whether maternal exposure to either periodontal disease at enrollment (less than 26 weeks) and/or periodontal disease progression during pregnancy, as determined by comparing postpartum with antepartum status, were predictive of preterm or very preterm births, adjusting for risk factors including previous preterm delivery, race, smoking, social domain variables, and other infections. RESULTS: Incidence of preterm birth was 11.2% among periodontally healthy women, compared with 28.6% in women with moderate-severe periodontal disease (adjusted risk ratio [RR] 1.6, 95% confidence interval [CI] 1.1-2.3). Antepartum moderate-severe periodontal disease was associated with an increased incidence of spontaneous preterm births (15.2% versus 24.9%, adjusted RR 2.0, 95% CI 1.2-3.2). Similarly, the unadjusted rate of very preterm delivery was 6.4% among women with periodontal disease progression, significantly higher than the 1.8% rate among women without disease progression (adjusted RR 2.4, 95% CI 1.1-5.2). CONCLUSION: The OCAP study demonstrates that maternal periodontal disease increases relative risk for preterm or spontaneous preterm births. Furthermore, periodontal disease progression during pregnancy was a predictor of the more severe adverse pregnancy outcome of very preterm birth, independently of traditional obstetric, periodontal, and social domain risk factors. LEVEL OF EVIDENCE: II-2.

Comparison of suction device with saliva ejector for aerosol and spatter reduction during ultrasonic scaling.

BACKGROUND: Aerosols and spatter are concerns in health care owing to their potential adverse health effects. The Isolite illuminated isolation system (Isolite Systems) and a saliva ejector were compared for aerosol and spatter reduction during and after ultrasonic scaling. METHODS: Fifty participants were randomized to control (n = 25, saliva ejector) or test (n = 25, Isolite) groups and received a prophylaxis with an ultrasonic scaler. Aerosols were collected in a petri dish containing transport media, dispersed, and plated to anaerobic blood agar to determine colony-forming units (CFUs). The authors analyzed the data using a t test. RESULTS: No significant difference occurred between groups in aerosol and spatter reduction (P = .25). Mean (standard deviation) of log10 CFUs per milliliter collected during ultrasonic scaling in the control and test groups were 3.61 (0.95) and 3.30 (0.88), respectively. All samples contained α-hemolytic streptococci, and many samples contained strictly oral anaerobes. CONCLUSIONS: A significant amount of contamination occurred during ultrasonic scaling in both groups, as indicated by high numbers of CFUs and the identification of strictly oral anaerobes in all plates. PRACTICAL IMPLICATIONS: Neither device reduced aerosols and spatter effectively, and there was no significant difference in reduction between the 2 devices. Additional measures should be taken with these devices to reduce the likelihood of disease transmission.

Technical Performance of Universal and Enhanced Intraoral Imaging Rectangular Collimators.

PURPOSE: The purpose of this study was to compare the number and type of technical errors between 2 rectangular collimators, time/motion effort and radiographer preference. METHODS: Subjects (n=17) were recruited to expose an 18 projection full mouth series (FMX) using Tru-Align™ (enhanced) and Rinn® (universal) collimator devices. Both FMXs were exposed using photostimulable phosphor (PSP) digital sensors on a DXTTR manikin with an intraoral x-ray unit. A 5-question survey evaluated ease of device use, time required and device preference. Data were analyzed using frequencies, paired t-test, ANOVA and least squares means using a general linear model. RESULTS: A lower mean number of technique errors per FMX occurred with the enhanced device (9.7) compared to the universal device (12.1). Collimator centering errors occurred 3-times more often with the universal device. The mean numbers of diagnostically unacceptable errors per FMX were similar (Universal=3.2 vs Enhanced=2.9). The least squares means adjusted model showed a statistically significant difference of errors between the 2 devices (p=0.0478) and errors by location when comparing posterior to anterior and posterior to bitewing (p<0.0001). Subjects (94%) preferred the enhanced device and found it easier to use compared to the universal device. Significantly less time was needed to expose an FMX (4 min) when using the enhanced device (p=0.0001). CONCLUSION: The enhanced device enabled subjects to expose diagnostically acceptable radiographs more efficiently with fewer collimator centering errors; however, it does so with a 35% greater exposure area and a concomitant increase in patient dose.

A Comparison of Technique Errors using Two Radiographic Intra-oral Receptor-holding Devices.

PURPOSE: Technological advances in intra-oral receptors have resulted in film-holding devices that may or may not be interchangeable with photostimulable phosphor receptors. This study evaluated the number and types of technique errors that occurred when using PSP receptors with a standard film-holding device and a dual PSP/film-designed device. METHODS: The Rinn XCP-ORA® (Standard) and the Rinn Flip-Ray® PA device (Test) were compared using rectangular collimation. DenOptix® imaging plates (sizes 1 and 2) were used as receptors. Fourteen periapical (10-size 2 and 4-size 1) projections were exposed per full mouth series on each Dental X-ray Teaching and Training Replica with both devices. Five Dental X-ray Teaching and Training Replicas were exposed by 3 experienced radiographers. Data were analyzed using a paired t-test to determine differences in the performance scores between the 2 devices. Technique errors (receptor placement, vertical angulation, horizontal angulation and cone centering) were reported using frequencies. An experienced evaluator critiqued each projection. RESULTS: A total of 15 full mouth series (210 projections) were taken per device. The mean performance scores per device were 88.4 (standard device) and 88.1 (test device) and were not statistically different (p=0.88). Cone centering errors were the most common error observed in both the standard (36%) and test (43%) devices. Receptor placement errors occurred when using the standard (12%) and test (9%) devices. Vertical and horizontal errors were <2% for both devices. CONCLUSION: Devices designed for use with film may be used interchangeably with photostimulable phosphor receptors. Some difference was noticed between devices regarding error type and occurrence.

Intrapocket anesthesia for scaling and root planing in pain-sensitive patients.

BACKGROUND: In 2 previous multicenter studies evaluating the efficacy of a novel anesthetic gel (lidocaine 25 mg/g plus prilocaine 25 mg/g), there was a rather small, although statistically significant, overall difference between the active and placebo gels. There were, however, large center variations. At centers where the placebo-treated patients reported high pain scores, the difference between treatments was large, suggesting that the anesthetic gel is most effective in patients who experience the procedure as painful. The present multicenter, double-blind, randomized study evaluated the anesthetic effect of this gel in pain-sensitive patients by using a visual analog scale (VAS) and a verbal rating scale (VRS). METHODS: One hundred thirteen (113) patients with moderate to severe periodontitis were screened for pain sensitivity upon probing. Eighty-five reported VAS > or = 30 mm on probing and were included in the treatment phase (43 anesthetic and 42 placebo gel). The periodontal pockets of one quadrant in each patient were treated with gel for 30 to 45 seconds, followed by scaling and/or root planing. RESULTS: The results were similar between centers. The median overall VAS pain score was 11 mm in the anesthetic group and 27 mm in the placebo group. The Hodges-Lehmann point estimate of the treatment difference was 10 mm (P = 0.004). No pain or only mild pain was reported by 70% in the anesthetic group and by 48% in the placebo group (P = 0.003). Two patients in the anesthetic group and 7 patients in the placebo group required rescue anesthesia. CONCLUSIONS: This study confirms the favorable anesthetic efficacy of active gel over placebo in selected pain-sensitive patients. It suggests that the gel may be a valuable alternative to conventional injection anesthesia.

Pre-clinical performance comparing intraoral film and CCD-based systems.

PURPOSE: The purpose of this study was to compare dental hygiene student radiographic performance using film and charge-coupled device (CCD) systems. Specific objectives were to compare the 1) number of technique errors, 2) error type, 3) retake frequency, and 4) learning experience using both systems. METHODS: Twenty-eight subjects exposed two 18-projection full series, one film-based, and one CCD-based system, on a manikin. One examiner, using standardized image quality criteria, evaluated all images. Each subject was assigned to one of four focus groups. Quantitative data were analyzed using ANOVA and Wilcoxon tests. Emic expressions and percentages were used to report qualitative data with themes supported by performance data. RESULTS: A greater number of technique errors occurred using the CCD system than the film system (p < 0.0001), with vertical angulation being the most common error (53%). Using the film-based system, 66% of the errors were due to incorrect horizontal angulation. Subjects exposed an average of 10 retakes per series using the CCD versus 3 retakes using film. Forty-four percent of the subjects felt their most common CCD errors were film placement and vertical angulation compared to 59% who believed horizontal angulation was the main technique error when using film. Difficulty placing the CCD sensor intraorally was expressed by 74%. The CCD system was reported to be beneficial for teaching theory (67%), with 59% preferring film for learning the psychomotor skill. CONCLUSION: In pre-clinical situations, the CCD system may be an effective tool for teaching technique. Radiographic errors are dependent on the type of image receptor used.

A comparison of slide/audiotape and Web-based instructional formats for teaching normal intraoral radiographic anatomy.

PURPOSE: The purpose of this study was to evaluate the relationship between individual learning styles, test performance, and attitudes toward the use of Web-based self-instruction and slide/audiotape self-instruction METHODS: Participants consisted of 33 junior, first-year dental hygiene students enrolled in a university-based dental hygiene program. A stratified random allocation (by gender, English as a second language, and prior dental experience) and random number table were used to assign participants into one of two groups. Group one studied the mandibular arch using the slide/audiotape format and the maxillary arch using the Web-based format, and group two studied the mandibular arch using the Web-based format and the maxillary arch using the slide/audiotape format. A post-test was taken at the completion of each instructional format. The Kolb Learning Style Inventory was used to assess preferred learning styles, and a written survey was used for instructional format preference. Descriptive analyses, Pearson correlations, and unpaired t-tests were used to analyze the data. RESULTS: Thirty-one subjects completed the study. By group, no difference in mean post-test performance was seen based on the sequence or order of instructional method (P > 0.05) or by arch (P > 0.05). No difference in post-test performance based on Web-based and slide-tape instructional methods was seen. Predominate learning style did not predict preference of instructional format nor were they correlated with post-test scores. However, almost 70% of all participants reported that they preferred using the Web-based format to the slide/audiotape. CONCLUSIONS: A variety of learning styles and preferences may be accommodated when substituting Web-based self-instruction for slide/audiotape self-instruction in normal radiographic anatomy.

Prevalence of periodontitis according to Hispanic or Latino background among study participants of the Hispanic Community Health Study/Study of Latinos.

BACKGROUND: Hispanics and Latinos are an ethnically heterogeneous population with distinct oral health risk profiles. Few study investigators have examined potential variation in the burden of periodontitis according to Hispanic or Latino background. METHODS: The authors used a multicenter longitudinal population-based cohort study to examine the periodontal health status at screening (2008-2011) of 14,006 Hispanic and Latino adults, aged 18 to 74 years, from four U.S. communities who self-identified as Cuban, Dominican, Mexican, Puerto Rican, Central American or South American. The authors present weighted, age-standardized prevalence estimates and corrected standard errors of probing depth (PD), attachment loss (AL) and periodontitis classified according to the case definition established by the Centers for Disease Control and Prevention and the American Academy of Periodontology (CDC-AAP). The authors used a Wald χ(2) test to compare prevalence estimates across Hispanic or Latino background, age and sex. RESULTS: Fifty-one percent of all participants had exhibited total periodontitis (mild, moderate or severe) per the CDC-AAP classification. Cubans and Central Americans exhibited the highest prevalence of moderate periodontitis (39.9 percent and 37.2 percent, respectively). Across all ages, Mexicans had the highest prevalence of PD across severity thresholds. Among those aged 18 through 44 years, Dominicans consistently had the lowest prevalence of AL at all severity thresholds. CONCLUSIONS: Measures of periodontitis varied significantly by age, sex and Hispanic or Latino background among the four sampled Hispanic Community Health Study/Study of Latinos communities. Further analyses are needed to account for lifestyle, behavioral, demographic and social factors, including those related to acculturation. PRACTICAL IMPLICATIONS: Aggregating Hispanics and Latinos or using estimates from Mexicans may lead to substantial underestimation or overestimation of the burden of disease, thus leading to errors in the estimation of needed clinical and public health resources. This information will be useful in informing decisions from public health planning to patient-centered risk assessment.

Heterogeneity in periodontitis prevalence in the Hispanic Community Health Study/Study of Latinos.

PURPOSE: The aim of the study was to examine acculturation and established risk factors in explaining variation in periodontitis prevalence among Hispanic/Latino subgroups. METHODS: Participants were 12,730 dentate adults aged 18-74 years recruited into the Hispanic Community Health Study/Study of Latinos (HCHS/SOL) from four U.S. field centers between 2008 and 2011. A standardized periodontal assessment measured probing pocket depth and gingival recession at six sites per tooth for up to 28 teeth. Periodontitis was defined according to the Centers for Disease Control and Prevention and American Academy of Periodontology case classifications developed for population surveillance. Covariates included acculturation indicators and established periodontitis risk factors. Survey estimation procedures took account of the complex sampling design. Adjusted multivariate binomial regression estimated prevalence ratios and 95% confidence limits (CLs). RESULTS: Unadjusted prevalence of moderate and severe periodontitis was 38.5% and ranged from 24.7% among Dominicans to 52.1% among Cubans. Adjusted prevalence ratios for subgroups relative to Dominicans were as follows: (1) 1.34 (95% CL, 1.13-1.58) among South Americans; (2) 1.37 (95% CL, 1.17-1.61) among Puerto Ricans; (3) 1.43 (95% CL, 1.25-1.64) among Mexicans; (4) 1.53 (95% CL, 1.32-1.76) among Cubans; and (5) 1.55 (95% CL, 1.35-1.78) among Central Americans. CONCLUSIONS: Heterogeneity in prevalence of moderate/severe periodontitis among Hispanic/Latino subpopulations was not explained by acculturation or periodontitis risk factors.

Risk indicators for third molar caries and periodontal disease in senior adults.

PURPOSE: This study was designed to identify risk indicators for the prevalence at enrollment and incidence over 36 months of periodontal pathology and coronal caries experience affecting third molars in a community-based study of people over 65 years of age. SUBJECTS AND METHODS: Data from a subsample of 810 dentate subjects from the Piedmont 65+ Study were available for analyses. All visible teeth were examined. Periodontal probing measures were taken at 2 sites, mesiobuccal and buccal/facial. Clinical data on caries experience were collected by visual-tactile examination. At enrollment, 340 subjects had at least 1 visible third molar; all were examined for caries experience. Periodontal probing measures were available for 277 of these same subjects. The significance of the possible risk indicators for periodontal pathology and caries affecting third molars was determined by chi(2) tests. Statistical significance was set at .05. Logistic multivariable models were used to derive odds ratios and 95% confidence intervals. RESULTS: African-American subjects were more likely to have visible third molars (P < .01). Caucasian subjects were more likely to have third molar coronal caries experience (P < .01), as were subjects with greater than a high school education and those with a dental visit within 3 years (both P < .01). However, African American subjects were more likely to have periodontal pathology, CALs >/= 3 mm on third molars (P < .01), as were those who used tobacco (P < .01). None of the other risk indicators we studied were associated with progression of periodontal pathology or coronal caries experience on visible third molars. CONCLUSION: In this population study of senior adults, Caucasians and African Americans appear to have different levels of risk for caries experience and periodontal pathology affecting retained third molars.

Third molars and progression of periodontal pathology during pregnancy.

PURPOSE: This study was conducted to evaluate the association between third molar periodontal pathology at enrollment and periodontal disease progression during pregnancy. PATIENTS AND METHODS: The data were derived from patients in an institutional review board-approved prospective study known as the Oral Conditions and Pregnancy (OCAP) study. Demographic, health behavior, and medical history data were obtained from medical records. Full-mouth periodontal examinations of 6 periodontal probing sites for each visible tooth, including third molars, were conducted at less than 26 weeks of pregnancy and within 72 hours postpartum. The primary outcome variable was periodontal progression (4 or more probing sites with at least a 2 mm increase in probing depth (PD), all at least 4 mm deep), between the enrollment and postpartum examinations. The primary predictor variables at enrollment were at least 1 PD >or=4 mm around the third molars, and the upper tertile of the number of third molar probing sites recorded as bleeding on probing (BOP). Bivariate analyses were performed for baseline characteristics. The chi2 test was used to determine statistical significance (P = .05). Significant variables were included in unconditional logistic multivariable models to derive relative risk ratios (RRs) and 95% confidence intervals (CIs). RESULTS: Data from enrollment and term were available for 360 subjects with visible third molars (mean age, 27.3 years; standard deviation, 5.5 years). At the postpartum examination, 122 subjects (34%) demonstrated periodontal progression. These subjects included 74 of the 176 subjects (42%) in whom a third molar PD >or=4 mm was detected at baseline and 48 of the 184 (26%) without third molar PD >or=4 mm (P = .001). Periodontal progression was found in 40 of the 77 subjects (52%) who were in the upper tertile of the number of third molar probing sites exhibiting BOP at enrollment versus 82 of the 203 (29%) in the lower tertiles (P = .0002). In multivariable models, either third molar PD >or=4 mm at enrollment (RR = 1.4; 95% CI = 1.1 to 2.0) or third molar bleeding on probing (RR = 1.7; 95% CI = 1.3 to 2.3) was associated with periodontal disease progression. CONCLUSION: Third molar periodontal pathology appears to be a significant risk indicator for periodontal disease progression during pregnancy.

The oral and systemic impact of third molar periodontal pathology.

PURPOSE: Analyze in pregnant subjects the relationship between third molar periodontal pathology, and subjects' overall periodontal status. Assess also, the associations between postpartum periodontal status by jaw and a systemic impact, preterm birth, or elevated serum C-reactive protein (CRP). PATIENTS AND METHODS: Data were from an IRB-approved study, Oral Conditions and Pregnancy. In this clinical study, full-mouth periodontal examinations including third molars were conducted at greater than 24 weeks of pregnancy and again within 72 hours of delivery. For our analyses, mean periodontal probing depth (PD) by visible tooth and by jaw were calculated at enrollment and postpartum. Subjects were categorized by 3 broad levels of periodontal health, considered the primary outcome variable. The primary predictor variable for levels of periodontal health was the presence or absence of visible third molars. Mean periodontal probing depth in the mandible or maxilla at term was considered an indicator of a possible risk of systemic exposure, increasing the odds of preterm birth, less than 37 weeks gestation, or elevated serum CRP levels. Chi-square and t tests were used to determine statistical significance, .05. Significant predictor variables were included in multivariable models. Unconditional logistic multivariate models were used to derive odds ratios (OR) and 95% confidence intervals (CI). RESULTS: Data from examinations at enrollment and postpartum were available for 1,020 and 891 subjects, respectively. Visible third molars were detected in 405 subjects at enrollment and in 360 subjects at term. No subjects had third molars removed during the study. At enrollment and postpartum, subjects with visible third molars were significantly more likely to have moderate/severe periodontal disease, 23.5% versus 8.5%, and 18.3 versus 9.4%, respectively. Mean PD was significantly greater for maxillary and mandibular molars than for more anterior teeth, P < .01. In both jaws, mean PD tended to be progressively greater from first to third molars. No differences were found in mean PD by jaw. In subjects with visible third molars, adjusting for the severity of mandibular periodontal disease, the level of maxillary periodontal disease was significantly associated with preterm birth, P < .01, OR 2.6 (95% CI 1.1-6.8), or the upper quartile of serum CRP at term, at least 23.0 mg/L postpartum, P = .05, OR 2.5 (95% CI 1.2-5.1). CONCLUSIONS: Subjects' detected levels of periodontal disease were greater at enrollment and postpartum if visible third molars were detected.

Third molar periodontal pathology and caries in senior adults.

PURPOSE: This study was designed to assess the prevalence at enrollment and incidence over 36 months of periodontal pathology and caries affecting third molars in a community-based study of people over the age of 65 years in North Carolina. SUBJECTS AND METHODS: A sub-sample of 818 subjects with dental examinations taken from the Piedmont 65+ Study was available for analysis. All visible teeth were examined. Periodontal probing (PD) measures were taken at 2 sites, mesiobuccal and buccal/facial. Clinical data on caries experience were collected by visual-tactile examination. At enrollment, 342 subjects had at least 1 visible third molar that could be examined. PD measures were available for 276 of these same subjects. The significance of comparisons between third molars and nonthird molars were determined by chi(2) tests and the statistical significance was set at .05. RESULTS: Most of the 342 subjects with at least 1 visible third molar were female (57%) or African American (63%). Mean age was 73 years (SD 5.5 years). Of the 197 subjects with caries experience, third molars were affected in 49% of subjects, less than the 87% in nonthird molars. Third molar caries experience was associated with caries experience on nonthird molar teeth (P < .01). Clinical attachment level (CAL) greater than 3 mm was detected at enrollment in third molars in 68% of subjects, and in nonthird molars in 96%. With one exception, CAL greater than 3 mm in third molars was associated with CAL greater than 3 mm elsewhere in the mouth. Few subjects (17%) had clinical evidence of both caries and periodontal pathology affecting third molars. In this older population of individuals with third molars, 21% were free of periodontal pathology or caries experience. CONCLUSIONS: Data on the prevalence of third molar periodontal pathology and third molar caries experience in an elderly population should be useful to both clinicians and their younger patients when considering the merits of retaining or removing third molars with no evidence of pathology.

Cross-contamination of the PSP sensor in a preclinical setting.

PURPOSE: This study tested an infection control protocol for photostimulable phosphor (PSP) sensors while simulating multiple uses. METHODS: Dental hygiene students (n=36) were randomly assigned to a control group (dry wipe) or test group (disinfectant wipe). A sterile, barriered sensor was placed in a peer patient's mouth to simulate an exposure. After simulation, the barriered sensors were disinfected, placed into a new barrier, and inserted into the same peer patient's mouth. Following the fourth placement and treatment, sensors were vortexed in specimen cups containing trypticase soy broth (TSB) and incubated at 37 degrees C to detect contamination by oral bacteria. RESULTS: Bacterial growth in TSB was monitored as a change in optical density and by quantitation of oral streptococci on Mitis-salivarius agar. The barrier-protected sensors were minimally contaminated (<10(5) colony forming units/ml at baseline) regardless of treatment. After culture amplification, the control TSB had more samples that remained negative through 48 hours (5/18 vs. 0/18 for test group, p<0.05). CONCLUSION: Barrier envelopes used with the PSP sensors appeared to be an effective way of reducing microbial contamination.