Papers by Peter Rammelsberg
Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.], Jan 26, 2016
To compare ultimate fracture load (Fu ), load at first damage (F1d ), and fracture pattern for po... more To compare ultimate fracture load (Fu ), load at first damage (F1d ), and fracture pattern for posterior fixed dental prostheses (FDPs) manufactured from translucent, yttria-stabilized zirconia polycrystal. Premolar-size FDPs in 4 test groups (n = 16/group) were constructed as veneered complete crown-retained (group 1), monolithic complete crown-retained (group 2), monolithic partial veneer crown-retained (group 3), or monolithic resin-bonded (group 4) prostheses with minimum zirconia wall thickness (0.5 mm). Adhesively cemented to metal abutments, half of the prostheses were artificially aged by use of 10,000 thermocycles (6.5°C/60°C) and 1,200,000 chewing cycles (F = 108 N), before fracture loading. Statistics included two-way non-parametric ANOVA and Dunn-Bonferroni post-hoc tests (α = 0.05). None of the restorations failed during artificial aging. Fu was affected by test group (p < 0.001); F1d was also affected by the factor combination of test group and aging (p = 0.001 for ...
Bookmarks Related papers MentionsView impact
Quintessence Publicacion Internacional De Odontologia, Apr 1, 2009
Bookmarks Related papers MentionsView impact
Quintessence International, May 1, 2008
This clinical report describes the rehabilitation of an edentulous mandible with an implant-suppo... more This clinical report describes the rehabilitation of an edentulous mandible with an implant-supported fixed prosthesis using an all-ceramic framework fabricated from zirconium oxide. Four interforaminal implants were inserted and allowed to heal submerged. The implant-supported fixed prosthesis was then fabricated using CAD/CAM and electroforming technology. No clinical complications were observed at the 6-month follow-up examination, and the patient was highly satisfied with function and esthetics. All-ceramic frameworks provide a high standard of esthetics; reduce the number of metals used in the oral cavity; and have a lower density compared to metals, which reduces weight in the case of large frameworks.
Bookmarks Related papers MentionsView impact
Quintessence Publicacion Internacional De Odontologia, Apr 1, 2010
Bookmarks Related papers MentionsView impact
Quintessence International, 2011
OBJECTIVE: To assess the survival rate of two different post systems after 5 years of service wit... more OBJECTIVE: To assess the survival rate of two different post systems after 5 years of service with a prospective randomized controlled trial.METHOD AND MATERIALS: One hundred patients in need of a post were studied. Half of the patients received long glass fiber-reinforced posts, while the other half received long metal screw posts. The posts were assigned randomly. After at least 5 years (mean, 61.37 months), follow-ups were established. When a complication occurred prior to this recall, the type and time of the complication was documented. Statistical analysis was performed using the log-rank test and Kaplan-Meier analysis. Additionally, a Cox regression was performed to analyze risk factors.RESULTS: The survival rate of fiber-reinforced posts was 71.8%. In the metal screw post group, the survival rate was significantly lower, 50.0% (log-rank test, P = .026). Metal posts resulted more often in more unfavorable complications (eg, root fractures); consequently, more teeth (n = 17) had to be extracted. The Cox regression identified the following risk factors: position of the tooth (anterior vs posterior teeth), degree of coronal tooth destruction, and the post system (fiber-reinforced post vs metal screw post). Fiber-reinforced restorations loosened in several patients; in some of these cases (n = 6), patients did not notice this, leading to the extraction of teeth.CONCLUSION: Long metal screw posts should be used with great care in endodontically treated teeth. Besides the selection of the post system, other factors influence the survival of the restoration.
Bookmarks Related papers MentionsView impact
Journal of Orofacial Pain, 2010
To determine the prevalence of facial pain and temporomandibular disorders (TMD) in people locate... more To determine the prevalence of facial pain and temporomandibular disorders (TMD) in people located in urban and rural areas in a newly industrialized country (Iran). Two-hundred twenty-three subjects between 18 and 65 years of age (mean: 32.07; SD: 10.83) were randomly selected from an urban area and a rural area. One-hundred nineteen subjects from Mashhad (major city) and 104 subjects from Zoshk (village) were voluntarily recruited from medical health-care centers. Subjects who consulted the health-care center for dental, ear, nose, or throat issues were excluded. The monitoring of public health attendance of all citizens at designated health-care centers is compulsory by local law. All subjects were examined in accordance with the Research Diagnostic Criteria for TMD (RDC/TMD). Facial pain was assessed by using a questionnaire; the prevalence of myofascial pain, disc displacement, and degenerative disorders was determined by clinical examination. Nonparametric tests were used to assess group differences (ie, between village and city). Subjects in urban areas suffered less from facial pain (20.2% versus 46.2%; P &amp;amp;amp;amp;amp;amp;amp;amp;lt; .01 [Mann-Whitney U test]) than subjects in rural areas. The frequency of TMD, disc displacement, and degenerative disorders was greater in the rural area. The symptoms under investigation were significantly more widespread in rural than in urban areas. With regard to TMD per se, the place of residence appears to be unimportant. However, the rural population was significantly affected by facial pain.
Bookmarks Related papers MentionsView impact
Quintessence International, Jun 1, 2009
To evaluate intraexaminer reliability in measurement of basic tooth color by use of a clinically ... more To evaluate intraexaminer reliability in measurement of basic tooth color by use of a clinically applicable spectrophotometer. Three examiners determined the L* (lightness), C* (chroma), and h* (hue) values and tooth color according to the Vita 3D-Master shade guide system (Vident), twice for 161 anterior teeth of 19 subjects by use of a spectrophotometer (Vita Easyshade 1, Vita Zahnfabrik). Between the 2 measurements on each tooth, the investigators had to completely remove the probe tip from the mouth. The reliability of the measurements was observed, and deviations between the 2 L*C*h* measurements, as well as DeltaEab for the measurements, were calculated. Exact agreement of chosen shade tab according to the 3D-Master shade guide was achieved in 48% of cases. Mean DeltaL*, DeltaC*, and Deltah* for all examiners were 1.9 (SD 1.7), 1.3 (SD 1.3), and 0.5 degrees (SD 0.7 degrees), respectively. The maximum deviation was 9 for DeltaL*, 7 for DeltaC*, and 3 degrees for Deltah*. Mean DeltaEab for the measurements was 2.7 (SD 1.8, range 0 to 9.5). Intraexaminer reliability was usually acceptable, although a clinically relevant difference between the 2 measurements of an examiner was occasionally observed. This uncertainty should be borne in mind in clinical routine and in studies reporting changes in color, eg, studies of tooth bleaching.
Bookmarks Related papers MentionsView impact
Clinical Oral Implants Research, 2016
The purpose of this study was to investigate the adaptation behavior of the stomatognathic system... more The purpose of this study was to investigate the adaptation behavior of the stomatognathic system after immediate loading (24 to 72 h after surgery) of two implants supporting mandibular overdentures, assessed on insertion and three months later. The study hypothesis was that insertion of the overdentures would significantly change masticatory performance and muscle activity at both times. Thirty subjects (nine female, mean age 69.64 ± 11.81 years; 21 male, mean age 68.67 ± 7.41 years) who participated in a randomized clinical trial were included in the study. Each patient was examined three times: (i) at baseline, after already having worn new dentures for three months (T1); (ii) immediately after insertion of the overdentures on the implants (T2); and (iii) after an adaptation period of three months (T3). Examination comprised assessment of masticatory performance with artificial test food (Optocal), and simultaneous bilateral surface EMG recording of the masseter and anterior temporalis muscles. Particle-size distribution (representative value X50 ), maximum muscle contraction (MVC), and total muscle work (TMW; area under the curve) were compared by use of repeated-measures analysis of variance (ANOVA). At T3, all measured variables (i.e., masticatory performance and muscle activity) were significantly different from those at T1. At T2, no significant changes were observed. The study hypothesis had to be rejected for T2 but accepted for T3. Functional rehabilitation (in terms of masticatory performance and masticatory muscle activity) does not occur immediately after immediate loading of two implants with mandibular overdentures, but requires a significant time for functional improvement.
Bookmarks Related papers MentionsView impact
The International Journal of Prosthodontics, 2009
The aim of this study was to investigate color matching under natural daylight and daylight lamp ... more The aim of this study was to investigate color matching under natural daylight and daylight lamp conditions. Twenty-nine preclinical students underwent a training course and then matched randomly chosen shade tabs of Vita 3D-Master Shade Guide under both natural daylight and daylight lamp conditions. Color difference (delta Eab) between presented and selected shade tabs was calculated. Statistical differences were explored by use of multivariate analyses. Mean delta Eab was 2.5 (1.0 to 4.3) with daylight lamp and 3.4 (0.9 to 7.4) with natural daylight. The difference was statistically significant (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; .001). The use of a daylight lamp helps to standardize light conditions and significantly improve the ability to match colors.
Bookmarks Related papers MentionsView impact
Journal of Orofacial Pain, Feb 1, 2003
Bookmarks Related papers MentionsView impact
European journal of oral sciences, Jan 8, 2015
The objective of this study was to investigate the mechanisms of physiological control of the cra... more The objective of this study was to investigate the mechanisms of physiological control of the craniomandibular system during force-controlled biting: in intercuspation, restricted by predetermined anatomic-geometrical conditions [i.e. biting in intercuspation (BIC)]; and on a hydrostatic system [i.e. auto-balanced static equilibrium of the mandible (BAL)], in which the mandible is balanced under unrestricted occlusal conditions. For 20 healthy subjects, the spatial positions of the condyles, the lower molars, and the incisal point were measured, and the electromyographic (EMG) activity of the musculus masseter and musculus temporalis anterior were recorded bilaterally, during force-controlled biting (50, 75, 100 N) on a hydrostatic device. The results were compared with those obtained during BIC. During BAL, the neuromuscular system stabilizes one condyle, so it behaves as a virtual fulcrum, and all available biomechanical degrees of freedom of the opposite side are used to achieve ...
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Objective: The objective was to evaluate the influence of the color temperature on the repeatabil... more Objective: The objective was to evaluate the influence of the color temperature on the repeatability and the influence of metamerism between natural teeth and shade tabs on visual tooth color determination. Method: Sixty preclinical students visually matched each other the color of the upper maxillary right incisor and left canine in groups of four under different light conditions (480 matches). The illuminant differed in the color temperature of light (5500° K, 4000° K, 3000° K and 2700° K). Color determination was made by group consensus using the 3D-Master (VITA Zahnfabrik) shade guide, which was repeated after two to four days. CIE L*a*b* values of the tabs were provided by the manufacturer. For assessment of repeatability, the percentage of matches between first and second match under one illuminant and ΔEab between the matches were calculated. To assess influence of a possible metameric effect, the mean value of first and second determination per color match and illuminant was...
Bookmarks Related papers MentionsView impact
Objectives: Objectives were to asses the color stability of four high-strength acrylic resin and ... more Objectives: Objectives were to asses the color stability of four high-strength acrylic resin and one ceramic denture teeth after exposure to artificial ageing and to different staining solutions. Furthermore, the cleaning effectiveness of a chemical-mechanical device and metamerism between acrylic and ceramic material should be evaluated. Methods: Selected were three shades (A2/A3/A3,5) of five brands (Phonares NHC and Phonares II by Ivoclar, Vita Physiodens, Merz Artegral and Physioset CT by Candulor); immersion solutions were VE water (control), cola, black tee, coffee, curcuma and red wine;(n=180). In a standardized experimental set-up all teeth were measured four times with a spectroradiometer (Photoresearch PR670) at start, after thermocycling, after 3 days, 4 weeks of immersion, and finally after cleaning (EcoClean). The data of spectroradiometer were expressed using the Commission Internationale d'Eclairage (CIE) L*a*b* color notation system. For calculation of metameric ...
Bookmarks Related papers MentionsView impact
Journal of orofacial pain, 2003
To investigate the course of myofascial pain defined by Research Diagnostic Criteria for Temporom... more To investigate the course of myofascial pain defined by Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) over a period of 5 years, and to identify prognostic factors from baseline data. Subjects were 155 consecutive patients and 80 community cases identified from an age-stratified representative population sample; all met the primary selection criterion of reporting pain in the temporomandibular joint (TMJ) or masticatory muscles. The 2 groups were combined to yield a total sample of 235 subjects (50 male, 185 female; mean age = 39 years). Subjects were evaluated at baseline, 1 year, 3 years, and 5 years by trained examiners using standardized, reliable methods. Psychological and behavioral factors were assessed by self report. According to RDC/TMD criteria, 50 (31%) of the 165 subjects presenting with myofascial pain (MFP) at baseline continued to have their disorder over a period of 5 years; 55 (33%) remitted, and 60 (36%) were recurrent cases. Bivariate stat...
Bookmarks Related papers MentionsView impact
Comparative Effectiveness and Efficacy Research and Analysis for Practice (CEERAP), 2012
... Approach Clovis Mariano Faggion Jr., Marc Schmitter , Peter Rammelsberg , and Stefan Listl ..... more ... Approach Clovis Mariano Faggion Jr., Marc Schmitter , Peter Rammelsberg , and Stefan Listl ... J Clin Periodontol 35:3–7 38. Pennington M, Vernazza C, Heasman P (2009) Making the leap from cost analysis to cost-effectiveness. J Clin Periodontol 36:667–668 39. ...
Bookmarks Related papers MentionsView impact
Radiology, 2005
To assess the normal position of the temporomandibular joint (TMJ) disk relative to the condyle b... more To assess the normal position of the temporomandibular joint (TMJ) disk relative to the condyle by using coronal magnetic resonance (MR) imaging in asymptomatic volunteers. This study was approved by the review committee for human research, and all subjects signed an informed consent form. Thirty symptom-free volunteers without histories of TMJ disorders underwent standardized clinical examinations. Afterward, bilateral sagittal oblique and coronal oblique MR images were acquired with the patient&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;s mouth opened and closed. The coronal oblique opened- and closed-mouth images were analyzed by using computer software. The medial and lateral edges of both the TMJ disk and the condyle were marked for these imaging examinations by using the section through the posterior 3 mm of the disk. To eliminate the effect of different magnifications and/or distortions, the distance between these points was measured automatically and divided by the largest mediolateral dimensions of the condyle. To assess the reliability of the measurements, four observers evaluated the position of the disk in the coronal plane. To assess the changes in position of the posterior 3 mm of the disk in the coronal plane in the closed- and opened-mouth positions, the Wilcoxon signed rank test for matched pairs was used. Interobserver measurement reliability was evaluated by using interclass correlation coefficients (ICCs). Analysis of the coronal closed-mouth disk position revealed a medial position of the TMJ disk relative to the condyle in 11 (21%) of 52 analyzed joints. In the opened-mouth position, the medial location of the disk was more frequent: 29 (85%) of 34 analyzed joints exhibited a medial position of the disk relative to the condyle in this plane. This increasingly medial position of the disk was statistically significant (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; or = .001). Measurement reliability assessment revealed sufficient results (ICC &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt; or = 0.7). At both closed- and opened-mouth MR imaging, a medially located TMJ disk seems to be within the normal range of variation. The disk seems to shift even more medially when the mouth is opened.
Bookmarks Related papers MentionsView impact
Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, 2004
Bookmarks Related papers MentionsView impact
The Journal of Prosthetic Dentistry, 2011
Bookmarks Related papers MentionsView impact
The Journal of Prosthetic Dentistry, 2008
Bookmarks Related papers MentionsView impact
Uploads
Papers by Peter Rammelsberg